FN Thomson Reuters Web of Science™ VR 1.0 PT B AU Kwiatkowski, S Baptiste, K Byrd, JM Julian, J Low, R Lyn, L Plate, D AF Kwiatkowski, S Baptiste, K Byrd, JM Julian, J Low, R Lyn, L Plate, D BE Chew, J Lucas, P Webber, S TI HOM dampers for ALS storage ring RF cavities. SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The main source of narrowband impedance in the Advanced Light Source (ALS) are higher order modes (HOMs) of the two main RF and three third harmonic cavities. These HOMs drive longitudinal and transverse coupled bunch instabilities, which are controlled using active beam feedback systems. The dominant longitudinal HOMs in both systems are TM011-like modes with the R/Q factor an order of magnitude higher than all other longitudinal modes. To reduce the growth rates within the range of the longitudinal feedback system (LFB), these modes were tuned away from beam resonances by means of cooling water temperature control (main rf system), and the combination of two tuners (third harmonic system). To improve the reliability of the longitudinal dampening system, we have built and installed E-type HOM dampers for the fundamental and harmonic cavities. We present the design, commissioning and performance of the HOM dampers in this paper. C1 LBNL, Berkeley, CA 94565 USA. RP Kwiatkowski, S (reprint author), LBNL, Berkeley, CA 94565 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1240 EP 1242 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600367 ER PT B AU Li, DR Ladran, A Staples, J Virostek, S Zisman, M Lau, W Yang, S Rimmer, RA AF Li, DR Ladran, A Staples, J Virostek, S Zisman, M Lau, W Yang, S Rimmer, RA BE Chew, J Lucas, P Webber, S TI A 201 MHZ RF cavity design with non-stressed pre-curved be windows for muon cooling channels SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We present a 201-MHz RF cavity design for muon cooling channels with non-stressed and pre-curved Be foils to terminate the beam apertures. The Be foils are necessary to improve the cavity shunt impedance with large beam apertures needed for accommodating large transverse size muon beams. Be is a low-Z material with good electrical and thermal properties. It presents an almost transparent window to muon beams, but terminates the RF cavity electro-magnetically. Previous designs use pre-stressed flat Be foils in order to keep cavity from detuning resulting from RF heating on the window surface. Be foils are expensive, and difficult to make under pre-stress to accommodate thermal expansion. An alternative design is to use pre-curved and non-stressed Be foils where the buckling direction is known, and frequency shifts can be properly predicted. We will present mechanical simulations of the Be window designs. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Li, DR (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 2 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1243 EP 1245 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600368 ER PT B AU Li, DR Corlett, J MacGill, R Wallig, J Zisman, M Moretti, A Qian, Z Wu, V Rimmer, R Norem, J Torun, Y AF Li, DR Corlett, J MacGill, R Wallig, J Zisman, M Moretti, A Qian, Z Wu, V Rimmer, R Norem, J Torun, Y BE Chew, J Lucas, P Webber, S TI RF tests of an 805 MHz pillbox cavity at Lab G of Fermilab SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We report recent high power RF tests on an 805 MHz RF pillbox cavity with demountable windows over beam apertures at Lab G of Fermilab, a dedicated facility for testing of MUCOOL (muon cooling) components. The cavity is installed inside a superconducting solenoidal magnet. A 12 MW peak RF power klystron is used for the tests. The cavity has been processed both with and without magnetic field. Without magnetic field, a gradient of 34 MV/m was reached rather quickly with very low sparking rate. In a 2.5 T solenoidal field, a 16 MV/m gradient was achieved, following several weeks of conditioning. Strong multipacting effects associated with high radiation levels were measured during processing with the magnetic field. More recently Be windows with TiN-coated surface have been installed and tested with and without the external magnetic field. 16 MV/m gradient without magnetic field was reached quickly as planned. Less multipacting was observed during the conditioning, indicating that the TiN-coated surface on the windows had indeed helped to reduce the secondary electron emission significantly. A gradient of 16.5 MV/m was finally achieved with magnet on in solenoidal mode and the field up to 4 T. Preliminary inspection of the Be window surface found no visual damage, in comparison with Cu windows where substantial surface damage was found. Preliminary understanding of conditioning the cavity in a strong magnetic field has been developed. More thorough window and cavity surface inspection is under way. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Li, DR (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. OI Torun, Yagmur/0000-0003-2336-6585 NR 4 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1246 EP 1248 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600369 ER PT B AU Li, DR Corlett, JN AF Li, DR Corlett, JN BE Chew, J Lucas, P Webber, S TI Deflecting RF cavity design for a recirculating Linac Based Facility for Ultrafast X-ray Science (LUX) SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We report on superconducting deflecting RF cavity designs for a Recirculating Linac Based Facility for Ultrafast X-ray Science (LUX) at Lawrence Berkeley National Laboratory. The deflecting cavities operate in the lowest dipole mode and are required to produce a temporal correlation within flat electron bunches, as needed for x-ray compression in crystal optics. Deflecting voltage of up to 8.5 MV is required at 3.9 GHz. We present a 7-cell cavity design in this paper. Seven such cavities are required to generate the 8.5 MV deflecting voltage. Longitudinal and transverse impedance from LOM's (lower order mode) and HOM's (higher order mode) are simulated using the MAFIA code. Short-range and long-range wakefields excited through these impedances are calculated. Beam loading effects of the deflecting mode and parasitic modes are estimated. Q values of the LOM monopole modes in the cavity need to be damped to be below 10(4)-10(5) levels in order to maintain the required energy spread. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Li, DR (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1249 EP 1251 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600370 ER PT B AU Baptiste, K AF Baptiste, K BE Chew, J Lucas, P Webber, S TI RF power detector/monitor upgrade for the 500MHz systems at the ALS SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Several systems rely on the accurate and linear detection of 500 MHz signals, (the fundamental frequency of both the Booster Ring and Storage Ring) over a dynamic range in excess of 25dB. Prior to this upgrade, the detector/monitor was diode based and though this type of detector could handle the dynamic range requirement it could not do so in an accurate and linear manner. In order to meet the requirements, (dynamic range greater than or equal to 25dB, accurate and linear to +/-0.25dB over the range, and additional circuitry to interface to the legacy control system and interlocks) a new RF Power Detector[Monitor has been developed using two AD8361, Analog Devices TruRMS Detectors and a fuzzy comparator, which extends the overall detector's range to twice that of the AD8361. Further information is available [www.analogedevices.com/]. Details of the design requirements and the detector/monitor's circuit as well as the performance of the detector will be presented. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Baptiste, K (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1252 EP 1254 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600371 ER PT B AU Baboi, N Bowden, GB Jones, RM Tantawi, SG Lewandowski, JR AF Baboi, N Bowden, GB Jones, RM Tantawi, SG Lewandowski, JR BE Chew, J Lucas, P Webber, S TI Transverse impedance bench measurements in NLC/JLC accelerating structures SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The wire method is a more rapid and less costly method to measure impedances of RF components compared to methods using a beam. A setup using a single displaced wire to excite and measure transverse resonant modes in accelerating structures for the Next Linear Collider/ Japanese Linear Collider (NLC/JLC) has been built. The RF signal is coupled into and out of the structure using two matching sections with a broadband frequency from 11 to 18 GHz. Their contribution to the scattering parameter is minimized by a calibration technique. A standing wave structure has been measured. Difficulties in accurately predicting the modal loss factors were encountered related to the approximations made and to experimental issues. The measurements are presented and comparisons with simulations are made. C1 SLAC, Stanford, CA 94025 USA. RP Baboi, N (reprint author), SLAC, Stanford, CA 94025 USA. OI Jones, Roger/0000-0001-6528-214X NR 13 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1261 EP 1263 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600374 ER PT B AU Dolgashev, VA Adolphsen, C Burke, DL Bowden, G Jones, RM Lewandowski, J Li, Z Loewen, R Miller, RH Ng, C Pearson, C Ruth, RD Tantawi, SG Wang, JW Wilson, P AF Dolgashev, VA Adolphsen, C Burke, DL Bowden, G Jones, RM Lewandowski, J Li, Z Loewen, R Miller, RH Ng, C Pearson, C Ruth, RD Tantawi, SG Wang, JW Wilson, P BE Chew, J Lucas, P Webber, S TI Status of x-band standing wave structure studies at SLAC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Dolgashev, VA (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. OI Jones, Roger/0000-0001-6528-214X NR 14 TC 4 Z9 4 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1264 EP 1266 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600375 ER PT B AU Dolgashev, VA AF Dolgashev, VA BE Chew, J Lucas, P Webber, S TI High magnetic fields in couplers of x-band accelerating structures SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Dolgashev, VA (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 16 TC 11 Z9 11 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1267 EP 1269 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600376 ER PT B AU McIntosh, P Hill, A Schwarz, H AF McIntosh, P Hill, A Schwarz, H BE Chew, J Lucas, P Webber, S TI An automated 476 MHz RF cavity processing facility at SLAC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The 476 MHz accelerating cavities currently used at SLAC are those installed on the PEP-II B-Factory collider accelerator. They are designed to operate at a maximum accelerating voltage of 1 MV and are routinely utilised on PEP-II at voltages up to 750 W During the summer of 2003, SPEAR will undergo a substantial upgrade, part of which will be to replace the existing 358.54 MHz RF system with essentially a PEP-II high energy ring (HER) RF station operating at 476.3 MHz and 3.2 MV (or 800 kV/cavity). Prior to installation, cavity RF processing is required to prepare them for use. A dedicated high power test facility is employed at SLAC to provide the capability of conditioning each cavity up to the required accelerating voltage. An automated LabVIEW based interface controls and monitors various cavity and test stand parameters, increasing the RF fields accordingly such that stable operation is finally achieved. This paper describes the high power RF cavity processing facility, highlighting the features of the automated control system and illustrating its operation with some recent high power processing results. C1 SLAC, Stanford, CA 94025 USA. RP McIntosh, P (reprint author), SLAC, Stanford, CA 94025 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1273 EP 1275 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600378 ER PT B AU Nantista, CD Dolgashev, VA Tantawi, SG AF Nantista, CD Dolgashev, VA Tantawi, SG BE Chew, J Lucas, P Webber, S TI Novel accelerator structure couplers SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Recent experience with X-band accelerator structure development has shown the rf input coupler to be the region most prone to rf breakdown and degradation, effectively limiting the operating gradient. A major factor in this appears to be high magnetic fields at the sharp edges of the coupling irises. As a first response to this problem, couplers with rounded and thickened iris horns have been employed, with improved performance. In addition, conceptually new coupler designs have been developed, in which power is coupled through the broadwall of the feed waveguide. A prototype "mode converter" coupler, which launches the TM01 mode in circular waveguide before coupling through a matching cell into the main structure, has been tested with great success. With peak surface fields below those in the body of the structure, this coupler represents a break-through in the NLC structure program. The design of this coupler and of variations which use beamline space more efficiently are described here. The latter include a coupler in which power passes directly through an iris in the broad wall of the rectangular waveguide into a matching cell and one which makes the waveguide itself an accelerating cell. We also discuss techniques for matching such couplers. C1 SLAC, Menlo Pk, CA 94025 USA. RP Nantista, CD (reprint author), SLAC, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1276 EP 1278 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600379 ER PT B AU Nelson, J Ross, M Frisch, J Le Pimpec, F Jobe, K McCormick, D Smith, T AF Nelson, J Ross, M Frisch, J Le Pimpec, F Jobe, K McCormick, D Smith, T BE Chew, J Lucas, P Webber, S TI Use of acoustic emission to diagnose breakdown in accelerator RF structures SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Accelerator structures of a wide variety have been damaged by RF breakdowns. Very little is known about the mechanisms that cause the breakdown and the damage although there has been theoretical work [1,2]. Using an array of ultrasonic acoustic emission sensors we have been able to locate and classify breakdown events more accurately than possible using microwave techniques. Data from the technique has led to improvements in the design of the NLC X-band RF structure. We report results of acoustic emission studies at the DESY TESLA Test Facility and the SLAC NLC Test Accelerator. C1 SLAC, Menlo Pk, CA 94025 USA. RP Nelson, J (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1279 EP 1281 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600380 ER PT B AU Wilson, PB AF Wilson, PB BE Chew, J Lucas, P Webber, S TI Gradient limitation in accelerating structures imposed by surface melting SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A rough picture is beginning to emerge of the physics behind the maximum gradient that can be sustained in an accelerating structure without producing surface damage at a level sufficient to cause a measurable change in the rf properties of the structure. Field emission sites are known to trigger the formation of so-called plasma spots in regions of high dc or rf surface electric fields. A single plasma spot has a finite lifetime (similar to20-50ns) and leaves behind a single crater. In the rf case, some fraction of the electrons emitted from the spot pick up energy from the rf field and back-bombard the area around the spot. Depending on the gradient, pulse length and available rf energy, multiple spots can form in close proximity. The combined back-bombardment power density from such a spot cluster can be sufficient to raise the surface temperature to the melting point in tens of nanoseconds over an area on the order of 100 microns in diameter. This molten area can now support a plasma capable of emitting several kiloamperes of electrons with an aver-age energy of 50-100kV. This is sufficient beam power to collapse the field in a travelling structure in 30 ns or so. The plasma also exerts a tremendous pressure on the molten surface, sufficient to cause a macroscopic amount of material to migrate toward a region of lower surface field. Over time, this process can modify the profile of the iris tip and produce an unacceptable change in the phase shift per cell. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Wilson, PB (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1282 EP 1284 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600381 ER PT B AU Kelly, MP Shepard, KW Kedzie, M Fuerst, JD Sharamentov, S Delayen, J AF Kelly, MP Shepard, KW Kedzie, M Fuerst, JD Sharamentov, S Delayen, J BE Chew, J Lucas, P Webber, S TI Microphonics measurements in SRF cavities for RIA SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Phase stabilization of the RIA drift tube cavities in the presence of microphonics will be a key issue for RIA. Due to the relatively low beam currents (less than or equal to0.5 pmA) required for the RIA driver, microphonics will impact the rf power required to control the cavity fields. Microphonics measurements on the ANL beta=0.4 single spoke cavity and on the ANL beta=0.4 two-cell spoke cavity have been performed many at high fields and using a new "cavity resonance monitor" device developed in collaboration with JLAB. Tests on a cold two-cell spoke are the first ever on a multi-cell spoke geometry. The design is essentially a production model with an integral stainless steel housing to hold the liquid helium bath. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Kelly, MP (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1291 EP 1293 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600384 ER PT B AU Fuerst, JD Kedzie, M Kelly, MP Shepard, KW AF Fuerst, JD Kedzie, M Kelly, MP Shepard, KW BE Chew, J Lucas, P Webber, S TI Superconducting 345 MHz two-spoke cavity for RIA SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB This paper reports development of a two-cell 345 MHz spoke-loaded superconducting cavity intended for the U.S. RIA Project driver linac. The 3 cm aperture cavity has a useful velocity range 0.3c < v < 0.6c. In initial tests at 4 K the prototype cavity operated cw at peak surface electric fields as high as 40 MV/m, and with 20 Watts of rf input power provides 3 MV of effective total accelerating voltage. As constructed, the niobium cavity shell was fully housed in an integral stainless-steel helium vessel using pure copper braze joints at the niobium to stainless-steel transitions. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Fuerst, JD (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1294 EP 1296 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600385 ER PT B AU Shepard, KW Kelly, MP Fuerst, JD Kedzie, M AF Shepard, KW Kelly, MP Fuerst, JD Kedzie, M BE Chew, J Lucas, P Webber, S TI Superconducting intermediate-velocity cavity development for RIA SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB This paper discusses the design and development of two types of intermediate-velocity superconducting cavity and an associated cryomodule for the RIA driver linac. The two cavity types are a 115 MHz, beta(GEOM) = 0.15 quarter-wave resonant (QWR) cavity, and a 173 MHz, beta(GEOM) = 0.26 coaxial half-wave cavity. The useful velocity range of the two cavity types extends from 0.1 to 0.4c. Both cavities are well-corrected for dipole and quadrupole asymmetries in the accelerating field. A cryomodule is being designed to incorporate a separate vacuum system for the cavity vacuum in order to provide a clean, low-particulate environment for the superconducting cavities. This will enable a higher degree of surface cleanliness than has previously been the case for TEM-type, drift-tube-loaded superconducting cavities. The status of prototype cavity and cryomodule construction are reported. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Shepard, KW (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. NR 5 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1297 EP 1299 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600386 ER PT B AU Tajima, T Edwards, RL Gentzlinger, RC Krawczyk, FL Ledford, JE Liu, JF Montoya, DI Roybal, RJ Schrage, DL Shapiro, AH Barni, D Bosotti, A Pagani, C Corniani, G Zanon, E AF Tajima, T Edwards, RL Gentzlinger, RC Krawczyk, FL Ledford, JE Liu, JF Montoya, DI Roybal, RJ Schrage, DL Shapiro, AH Barni, D Bosotti, A Pagani, C Corniani, G Zanon, E BE Chew, J Lucas, P Webber, S TI Results of two LANL beta=0.175,350-MHz, 2-GAP spoke cavities SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Two beta = 0.175, 350 MHz, 2-gap superconducting (SC) spoke cavities were fabricated in industry under the Advanced Accelerator Applications (AAA) project for the transmutation of nuclear waste. These cavities are promising candidates for the accelerating structures between a RFQ and the elliptical SC cavities for proton and heavy ion linacs. Since their delivery in July 2002, they have been tested in terms of mechanical properties, low-temperature performance, i.e., Q(0)-E-acc curves at 4 K and 2 K, surface resistance dependence on temperature and for multipacting (MP). The two cavities achieved accelerating fields of 13.5 MV/m and 13.0 MV/m as compared to the required field of 7.5 MV/m with enough margin for the quality factor. These cavities seem to need more time to condition away MP than elliptical cavities, but MP does not occur once the cavity is conditioned and kept at 4 K. The length of the 103 mm-diameter nominal coupler port was found to be too short for the penetrating field. C1 LANL, Los Alamos, NM 87545 USA. RP Tajima, T (reprint author), LANL, Los Alamos, NM 87545 USA. RI Bosotti, Angelo/I-4633-2015 OI Bosotti, Angelo/0000-0002-3037-7605 NR 6 TC 3 Z9 3 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1341 EP 1343 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600401 ER PT B AU Tajima, T Edwards, RL Liu, J Krawczyk, FL Schrage, DL Shapiro, AH AF Tajima, T Edwards, RL Liu, J Krawczyk, FL Schrage, DL Shapiro, AH BE Chew, J Lucas, P Webber, S TI Q disease on 350-MHz spoke cavities SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Q disease, i.e., an increase of RF surface resistance due to hydride precipitation, has been investigated with 350-MHz spoke cavities. This phenomenon was studied extensively in the early 1990s with cavities at frequencies >1 GHz. This is possibly due to the fact that the lower-frequency cavities were believed to show insignificant effect. However, early 500-MHz KEK elliptical cavities and JAERI 130-MHz quarter wave resonators have shown significant Q degradation, suggesting that this disease can be a serious problem with lower-frequency cavities as well. Since there were no quantitative data with 350-MHz cavities, we decided to measure our two spoke cavities. Our spoke cavities were made of RRRsimilar to250 niobium and were chemically polished similar to150 microns. A few series of systematic tests have shown that our spoke cavities do not show any Q(0) degradation after up to similar to24 hours of holding the cavity at 100 K. However, it starts showing degradation if it is held for a longer time and the additional loss due to the Q disease increases linearly. It was also found that our spoke cavity recovers from Q disease if it is warmed up to 150 K or higher for 12 hours. C1 LANL, Los Alamos, NM 87545 USA. RP Tajima, T (reprint author), LANL, Los Alamos, NM 87545 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1344 EP 1346 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600402 ER PT B AU Rusnak, B Shen, S AF Rusnak, B Shen, S BE Chew, J Lucas, P Webber, S TI Update on RF system studies and VCX fast tuner work for the RIA driver linac SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The limited cavity beam loading conditions anticipated for the Rare Isotope Accelerator (RIA) create a situation where microphonic-induced cavity detuning dominates radio frequency (RF) coupling and RF system architecture choices in the linac design process. Where most superconducting electron and proton linacs have beam-loaded bandwidths that are comparable to or greater than typical microphonic detuning bandwidths on the cavities, the beam-loaded bandwidths for many heavy-ion species in the RIA driver linac can be as much as a factor of 10 less than the projected 80-150 Hz microphonic control window for the RF structures along the driver, making RF control problematic. While simply overcoupling the coupler to the cavity can mitigate this problem to some degree, system studies indicate that for the low-beta driver linac alone, this approach may cost 50% or more than an RF system employing a voltage controlled reactance (VCX) fast tuner. An update of these system cost studies, along with the status of the VCX work being done at Lawrence Livermore National Lab is presented here. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Rusnak, B (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1347 EP 1349 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600403 ER PT B AU Kim, SH AF Kim, SH BE Chew, J Lucas, P Webber, S TI Simulation of quench dynamics in SRF cavities under pulsed operation SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB As has been well verified both theoretically and experimentally in steady state, the thermal stability of SRF (superconducting radio-frequency) cavities strongly depends on the material properties of niobium such as RRR (residual resistivity ratio) and the presence of material defects on the surface. Recently, SRF technology has been chosen for pulsed machines such as the Testa Test Facility (TTF), the Spallation Neutron Source (SNS), and the European Spallation Source (ESS). In order to guide the selection of operational limits and materials, an understanding of dynamics of quenching in pulsed operation is important. For this purpose, a universal thermal stability analysis algorithm is set up. With the help of 3D FEM codes, a series of transient, non-linear and self-correlated analyses are carried out. This scheme may be used for any stability analysis in SRF cavities with arbitrary conditions such as 3D structure, varying material properties, transient behavior, non-linear material properties, etc. C1 Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37830 USA. RP Kim, SH (reprint author), Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37830 USA. NR 8 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1365 EP 1367 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600409 ER PT B AU Ciovati, G Kneisel, P Myneni, G Sekutowicz, J Brinkmann, A Singer, W Halbritter, J AF Ciovati, G Kneisel, P Myneni, G Sekutowicz, J Brinkmann, A Singer, W Halbritter, J BE Chew, J Lucas, P Webber, S TI Preliminary studies of electric and magnetic field effects in superconducting niobium cavities SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Superconducting cavities made from high purity niobium with RRR > 200 often show pronounced features in the Q vs. E-acc dependence such as a peak at low gradients, a B-2-slope at intermediate fields and a steep degradation of Q-values ("Q-drop") at gradients above E-acc similar to 20 MV/m without field emission loading. Whereas the B-2-slope is in line with 'global' heating [2] there are still different models to explain the observed "Q-drop". The model of ref. [1] is based on magnetic field enhancements at grain boundaries in the equator weld region of the cavity and local heating. These grain boundaries become normal conducting, when their critical magnetic field is reached and contribute gradually to the losses in the cavity as long as they are thermally stable. The model proposed in ref. [2] is based on effects taking place in the metal-oxide interface on the niobium surface. The major contribution to the RF absorption is coming from interface tunnel exchange between electronic states of superconducting Nb with their energy gap and localized states of the dielectric Nb2O5. An experimental program was started at JLab to settle the mechanisms behind B-2-Slope and the Q-drop. A modified CEBAF single cell cavity is excited in either TM010 or TE011 modes and the Q vs. E-acc dependences are measured as a function of various surface treatments such as BCP, electropolishing, high temperature heat treatment and "in-situ" baking. In addition, a special two-cell cavity was designed, which allows the excitation of the 0 - and pi - modes of the TM010 passband, which "scan" different areas of the cavity surface with high electric and magnetic fields, respectively. This contribution reports about the design and first measurements with both types of cavities. C1 TJNAF, Newport News, VA 23606 USA. RP Ciovati, G (reprint author), TJNAF, Newport News, VA 23606 USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1374 EP 1376 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600412 ER PT B AU Daly, EF Campisi, IE Henry, J Hicks, WR Hogan, J Kneisel, P Machie, D Reece, CE Rothgeb, T Sekutowicz, J Smith, K Whitlatch, T Wilson, KM Wiseman, M AF Daly, EF Campisi, IE Henry, J Hicks, WR Hogan, J Kneisel, P Machie, D Reece, CE Rothgeb, T Sekutowicz, J Smith, K Whitlatch, T Wilson, KM Wiseman, M BE Chew, J Lucas, P Webber, S TI Improved prototype cryomodule for the CEBAF 12 GeV upgrade SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In order to provide a higher performance building block cryomodule for the CEBAF 12 GeV upgrade, modifications have been made to the design of the Upgrade Cryomodule. The prototype cryomodule will be completed in 2004 and be installed for operation in CEBAF. Design changes enable the use of higher gradient cavities to achieve greater than 100 MV per cryomodule while not exceeding the budgeted cryogenic load of 300 W during steady-state operation. They also include refinements based on experience gained during the construction of the first generation upgraded cryomodules as well as the prototype cryomodule for the Spallation Neutron Source. Two cavity designs will be used in the prototype, one optimized for E-peak/E-acc ratio, and the other optimized for minimum cryogenic load. The input waveguides, thermal shield and piping have been redesigned to accommodate the higher expected heat loads. The vacuum connections consist of niobiumtitanium flanges, aluminum-magnesium seals and stainless steel clamps to provide reliable UHV sealing. The cavity tuner features one cold motor and two piezoelectric actuators to provide coarse and fine tuning respectively. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Daly, EF (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RI Sekutowicz, Jacek/A-6561-2013 NR 7 TC 0 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1377 EP 1379 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600413 ER PT B AU Delayen, JR AF Delayen, JR BE Chew, J Lucas, P Webber, S TI Lorentz detuning of superconducting cavities with unbalanced field profiles SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Tests on the prototype SNS medium beta cryomodule showed a strong correlation between the flatness of the field profile and the Lorentz detuning coefficient (both static and dynamic). We present an analytical model for the enhancement of the Lorentz detuning as a function of the flatness of the field profile resulting from a spread of the frequencies of the individual cells of the cavity. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Delayen, JR (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. NR 1 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1380 EP 1382 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600414 ER PT B AU Davis, GK Delayen, JR AF Davis, GK Delayen, JR BE Chew, J Lucas, P Webber, S TI Piezoelectric tuner compensation of Lorentz detuning in superconducting cavities SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Pulsed operation of superconducting cavities can induce large variations of the resonant frequency through excitation of the mechanical modes by the radiation pressure. The phase and amplitude control system must be able to accommodate this frequency variation; this can be accomplished by increasing the capability of the rf power source. Alternatively, a piezo electric tuner can be activated at the same repetition rate as the rf to counteract the effect of the radiation pressure. We have demonstrated such a system on the prototype medium beta SNS cryomodule [1] with a reduction of the dynamic Lorentz detuning during the rf pulse by a factor of 3. We have also measured the amplitude and phase of the transfer function of the piezo control system (from input voltage to cavity frequency) up to several kHz [2]. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Davis, GK (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. NR 2 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1383 EP 1385 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600415 ER PT B AU Mammosser, J Rothgeb, T Wang, T Wu, AT AF Mammosser, J Rothgeb, T Wang, T Wu, AT BE Chew, J Lucas, P Webber, S TI Investigation into the effectiveness of the JLAB high pressure rinse system SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB As part of a study to reduce field emission in Superconducting radio frequency cavities, an investigation into the effectiveness of the Jefferson Lab's High Pressure Rinse (HPR) system is underway. This paper describes discoveries from this investigation, the procedural changes made during this investigation, current vertical test results and further plans for improvements and monitoring. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Mammosser, J (reprint author), Jefferson Lab, Newport News, VA 23606 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1386 EP 1388 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600416 ER PT B AU Rimmer, R Wang, H Wu, G Li, D AF Rimmer, R Wang, H Wu, G Li, D BE Chew, J Lucas, P Webber, S TI Towards strongly HOM-damped multi-cell RF cavities SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB This paper discusses the prospects for very strong HOM damping in multi-cell RF cavities. There has been much progress in recent years towards "HOM-free" single-cell cavities. Many examples are now operating in high current storage rings around the world. There have also been successes in broad-band damping of multi-cell structures to levels appropriate for linear colliders and low average current applications. We describe the use of modem simulation tools to explore the potential for applying these techniques to multicell structures. Such cavities would be useful for high-current, high-power applications such as high luminosity collider storage rings, damping rings, energy recovered linacs and injector systems. These methods may be applicable in to both room temperature and superconducting cavities. C1 JLAB, Newport News, VA USA. RP Rimmer, R (reprint author), JLAB, Newport News, VA USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1389 EP 1391 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600417 ER PT B AU Sekutowicz, J Ciovati, G Kneisel, P Wu, G Brinkmann, A Hartung, W Parodi, R Zheng, S AF Sekutowicz, J Ciovati, G Kneisel, P Wu, G Brinkmann, A Hartung, W Parodi, R Zheng, S BE Chew, J Lucas, P Webber, S TI Cavities for JLAB's 12 GeV upgrade SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The future 12 GeV upgrade of CEBAF requires new cryomodules in both linacs to increase the energy gain per pass to 1090 MeV [1]. Until recently, the design of new cryomodules, which should deliver on average operational voltage of 70 MV each, was based on 7-cell superconducting cavities that are an extended version of the 5-cell structures currently used in the machine. The 5-cell cavities were constructed 20 years ago at Cornell University (Original Comell-shape) for the Cornell Electron Storage Ring (CESR). The geometry of these structures [2] met specifications at the time CESR was constructed but is not optimized for the future operation of CEBAF. Two improved cavity shapes have been proposed. This contribution presents the RF features of both new shapes and discusses advantages for the machine operation resulting from the improvement. In addition, we comment on the measurements on copper models of both new cavities and present results of the multipacting calculations. C1 TJNAF, Newport News, VA 23606 USA. RP Sekutowicz, J (reprint author), TJNAF, Newport News, VA 23606 USA. NR 12 TC 7 Z9 7 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1395 EP 1397 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600419 ER PT B AU Wang, T Reece, C Sundelin, R AF Wang, T Reece, C Sundelin, R BE Chew, J Lucas, P Webber, S TI Field emission studies from NB surfaces relevant to SRF cavities SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID NIOBIUM AB Enhanced field emission (EFE) presents the main impediment to higher acceleration gradients in superconducting rf (SRF) niobium (Nb) cavities for particle accelerators. A scanning field emission microscope was built at Jefferson Lab with the main objective of systematically investigating the sources of EFE from Nb surfaces. Various surface preparation techniques and procedures, including chemical etching, electropolishing, ultrasonic water rinse, high pressure water rinse, air-dry after methanol rinse, air-dry after water rinse in Class 10 cleanroom, were investigated. The capability and process variables for broad-area Nb surfaces to consistently reach field emission free or near field emission free performance at similar to140 MV/m have been experimentally demonstrated using the above techniques/procedures. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Wang, T (reprint author), Jefferson Lab, Newport News, VA 23606 USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1398 EP 1400 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600420 ER PT B AU Wu, G Phillips, L Sundelin, R Valente, AM AF Wu, G Phillips, L Sundelin, R Valente, AM BE Chew, J Lucas, P Webber, S TI Niobium thin film properties affected by deposition energy during vacuum deposition SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID CAVITIES; COATINGS AB In order to understand and improve the superconducting performance of niobium thin films at cryogenic temperatures, an energetic vacuum deposition system has been developed to study deposition energy effects on the properties of niobium thin films on various substrates. Ultra high vacuum avoids the gaseous inclusions in thin films commonly seen in sputtering deposition. A retarding field energy analyzer is used to measure the kinetic energy of niobium ions at the substrate location. A biased substrate holder controls the deposition energy. Transition temperature and residual resistivity ratio (RRR) of the niobium thin films at several deposition energies are obtained together with crystal orientation measurements and atomic force microscope (AFM) inspection, and the results show that there exists a preferred deposition energy around 115eV (the average deposition energy 64 eV plus the 51 V bias voltage). C1 Jefferson Lab, Newport News, VA 23606 USA. RP Wu, G (reprint author), Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1401 EP 1403 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600421 ER PT B AU Berg, SW Bromberek, D Gagliano, J Grelick, AE Goeppner, G Nassiri, A Smith, T AF Berg, SW Bromberek, D Gagliano, J Grelick, AE Goeppner, G Nassiri, A Smith, T BE Chew, J Lucas, P Webber, S TI Rebuilding WR-340 and WR-284 waveguide switches to meet higher power at the advanced photon source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The high-power S-band switching system for the Advanced Photon Source (APS) linear accelerator (linac) provides for a hot spare for two of the four S-band transmitters. The system utilizes four-port S-band switches of aluminum construction that are pressurized with sulfur hexafluoride during normal operation and are commercially available. A high-power S-band transmitter test stand at the APS linac has shown that processes that include the hand working and electropolishing of sharp edges internal to the aluminum construction of these switches have measurably improved power handling characteristics. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Berg, SW (reprint author), Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. NR 6 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1416 EP 1418 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600426 ER PT B AU Pasky, S Soliday, R AF Pasky, S Soliday, R BE Chew, J Lucas, P Webber, S TI Conducting research and operator training while maintaining top-up reliability using the advanced photon source linear accelerator SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In recent years many changes have been made to the Advanced Photon Source (APS) linear accelerator (linac) to support multiple tasks. The primary purpose of the linac is to provide beam to fill the APS storage ring, which is done using thermionic cathode rf guns. At the same time we provide support for research projects, including a new facility that will be used for future operator training and testing of injector components. With each task requiring a different lattice and timing configuration, while at the same time using common rf systems, the complexity of operations has increased significantly with even greater demands being made on reliability and performance. In addition, personnel safety and equipment protection concerns have become more complex. We approached these challenges by developing three new subsystems: a highly automated linac operation using APS's Procedure Execution Manager (PEM) software; a new interlock system based on programmable logic controllers; and an automated S-band rf switching system. In this paper, we discuss how these developments have improved the flexibility and reliability of the APS linac, and how we intend to conduct operator training and test new injector components while maintaining storage ring injections. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Pasky, S (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1419 EP 1421 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600427 ER PT B AU Smith, TL Waldschmidt, G Grelick, A Berg, S AF Smith, TL Waldschmidt, G Grelick, A Berg, S BE Chew, J Lucas, P Webber, S TI Bidirectional coupler optimization in WR284-type waveguide SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In the Advanced Photon Source linac gun test area at Argonne National Laboratory a new S-band ballistic bunch compression (BBC) gun is being tested [1]. It was determined that a WR284 waveguide bidirectional coupler with a directivity of greater than 30 dB and a coupling of -57 +/- 1 dB was desired for evaluation of waveguide rf power conditions. Numerical simulations were performed using the High Frequency Structure Simulator (HFSS) [2] and experimental models were built to determine the optimal dimensions of the bidirectional coupler assembly and the orientation of the loop coupler element. Magnetic and electric fields in the coupler were adjusted by modifying the coupling of the fields as well as the capacitance of the coupling loop. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Smith, TL (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. EM tls@aps.anl.gov NR 4 TC 1 Z9 1 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1422 EP 1424 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600428 ER PT B AU He, P Hseuh, HC Gassner, D Gullotta, J Trbojevic, D Zhang, SY AF He, P Hseuh, HC Gassner, D Gullotta, J Trbojevic, D Zhang, SY BE Chew, J Lucas, P Webber, S TI Calibration of RHIC electron detectors SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB To characterize the electron cloud in RHIC, eleven custom electron detectors have been designed, fabricated and installed at a few RHIC warm-bore vacuum sectors for data collection during FY2003 runs. Prior to installation, the transmission and collection efficiencies of these detectors at various grid and collector bias voltages were measured using an electron gun with energy up to 1500 eV. This paper describes the design of the detector and the test system set-up, and summarizes the calibration results. In addition the calibration of a commercial micro-channel plate is also reported. C1 BNL, Collider Accelerator Dept, Upton, NY 11973 USA. RP He, P (reprint author), BNL, Collider Accelerator Dept, Upton, NY 11973 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1425 EP 1427 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600429 ER PT B AU Ludewig, H Simos, N Davino, D Cousineau, S Catalan-Lasheras, N Brodowski, J Touzzolo, J Longo, C Mullany, B Raparia, D AF Ludewig, H Simos, N Davino, D Cousineau, S Catalan-Lasheras, N Brodowski, J Touzzolo, J Longo, C Mullany, B Raparia, D BE Chew, J Lucas, P Webber, S TI Integration of the beam scraper and primary collimator in the SNS ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The collimation system in the SNS ring includes a two-stage collimator consisting of a halo scraper and an appropriate fixed aperture collimator. This unit is placed between the first quadru-pole and the first doublet in the collimation straight section of the ring. The scraper is situated at the exact mid-point between these two magnets, and the fixed aperture collimator fills the space between the scraper and the doublet magnet. The scraper and collimator are surrounded by an outer shield structure. The downstream dose to the doublet and the attached corrector magnet will be estimated for normal operating conditions. In addition, the cooling water activation will be estimated. Finally, the dose at the flange locations will be estimated following machine shutdown. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Ludewig, H (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. OI Davino, Daniele/0000-0002-7492-8173 NR 4 TC 1 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1428 EP 1430 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600430 ER PT B AU Montag, C Ganetis, G Jia, L Louie, W AF Montag, C Ganetis, G Jia, L Louie, W BE Chew, J Lucas, P Webber, S TI Vibration studies on a superconducting RHIC interaction region quadrupole triplet SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Mechanical vibrations of the superconducting interaction region triplets have been identified as source of horizontal beam jitter around 10 Hz in the Relativistic Heavy Ion Collider (RHIC). Therefore, cold masses inside one triplet cryostat have been equipped with accelerometers to further investigate the phenomenon. Additionally, helium pressure transducers have been installed to determine helium pressure oscillations as a possible primary vibration source. Recent results will be reported. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Montag, C (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1431 EP 1433 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600431 ER PT B AU Hurh, P Leveling, A AF Hurh, P Leveling, A BE Chew, J Lucas, P Webber, S TI Autopsy results of failed lithium collection lenses at the FNAL antiproton source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A lithium lens focusing device is used at the FNAL Antiproton Source to collect antiprotons immediately downstream of the production target. Recently developed methods of removing lithium from old collection lens devices have enabled the dissection and autopsy of several failed lenses. Examination reveals longitudinal fatigue cracks in the titanium alloy (6 Al- 4V) cooling jackets. A finite element analysis to estimate stress intensity factors expected in the cooling jackets is presented and compared to the crack propagation and fracture toughness thresholds for Ti 6Al-4V. Results presented indicate that crack initiation and propagation at the currently estimated service loads are unlikely without additional material degradation mechanisms at work. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Hurh, P (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1440 EP 1442 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600434 ER PT B AU Hurh, P Morgan, J Schultz, R AF Hurh, P Morgan, J Schultz, R BE Chew, J Lucas, P Webber, S TI The design of a diffusion bonded high gradient collection lens for the FNAL antiproton source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Advances in metal joining technology have made it possible to manufacture a one piece lithium lens design utilizing diffusion bonding rather than the current multiple piece, electron beam welded lithium lens design. Advantages of the new design include fewer lithium seals, incorporation of heat treatment with the bonding cycle, vastly simpler assembly requirements, and decreased cost and manufacturing time. Fatigue testing results are presented which indicate that the diffusion bonded joints are just as strong as the parent material. Results from a first prototype of this new design are presented as well as the design of a second prototype. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Hurh, P (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1443 EP 1445 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600435 ER PT B AU Johnstone, C Brown, C Carey, D Kostin, M Raja, R Hartouni, E AF Johnstone, C Brown, C Carey, D Kostin, M Raja, R Hartouni, E BE Chew, J Lucas, P Webber, S TI Beamline design for particle production experiment, E907, at FNAL SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Experiment 907 at Fermilab will be conducted in the Meson Center beam enclosure. The purpose of this experiment is to measure cross sections for hadron production from nuclear interactions using pions, kaons and proton beams in the momentum range from 5 to 120 GeV/c. Light to heavy targets will be used to study the scaling laws of hadronic fragmentation and light meson and baryon spectroscopy. Design aspects for the experiment's beamline are presented. The lattice, in particular the secondary beamline design, the primary target, and the collimation system are covered. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Johnstone, C (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. OI Hartouni, Edward/0000-0001-9869-4351 NR 4 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1446 EP 1448 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600436 ER PT B AU Schultz, R Hurh, P AF Schultz, R Hurh, P BE Chew, J Lucas, P Webber, S TI Lithium collection lens filling process for fermilab antiproton source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The most critical step in fabrication of the lithium collection lens is the introduction of molten lithium into the core of the lens. A preload (hydrostatic compressive stress) of approximately 2500 psi is desired within the solid lithium for proper lens operation. Instrumentation that is accurate at temperatures well above the melting temperature of lithium (180.6 degreesC) must be used to monitor the pressure during the fill to achieve the desired preload. Measurements from recent lens fills show that as the lens cools, the preload decreases by approximately 50 psi/degreesC on average. This paper shows that this apparent thermal expansion modulus can be determined analytically as well as numerically. These results are then compared to measured values. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Schultz, R (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1449 EP 1451 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600437 ER PT B AU Tariq, S Ammigan, K Hurh, P Schultz, R Liu, P Shang, J AF Tariq, S Ammigan, K Hurh, P Schultz, R Liu, P Shang, J BE Chew, J Lucas, P Webber, S TI Material testing-fermilab antiproton source lithium collection lens SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The lithium collection lens is a high current (greater than 0.5 MA), pulsed device used to focus antiprotons just downstream of the production target. Pre-mature failure of these lenses has led to extensive efforts to understand the cause of the failures. One of the main unknowns is the structural behavior of lithium under such extreme loading conditions. Lithium can be categorized as a soft or "plastic" solid with relatively low modulus of elasticity and yield strength. Very little is available on its nonlinear and viscoplastic (rate dependent) structural properties. Tests were conducted to determine the rate dependent tensile behavior and creep response of lithium at various temperatures. Results of these tests are presented. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Tariq, S (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 5 TC 1 Z9 1 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1452 EP 1454 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600438 ER PT B AU Bradley, J Rees, D Hardek, T Lynch, M Roybal, W Tallerico, P AF Bradley, J Rees, D Hardek, T Lynch, M Roybal, W Tallerico, P BE Chew, J Lucas, P Webber, S TI Spallation neutron source high-power RF transmitter design for high availability, ease of installation and cost containment SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The availability goals and installation schedule for the Spallation Neutron Source (SNS) have driven the availability and installation of the SNS linac's high-power RF systems. This paper discusses how the high-power RF systems' availability and installation goals have been addressed in the RF transmitter design and procurement. Design features that allow RF component failures to be quickly diagnosed and repaired are also presented. Special attention has been given to interlocks, PLC fault logging and real-time interfaces to the accelerator's Experimental Physics and Industrial Control System (EPICS) archive system. The availability and cost motivations for the use of different RF transmitter designs in the normal-conducting and super-conducting sections of the linac are reviewed. Factory acceptance tests used to insure fully functional equipment and thereby reduce the time spent on installation and commissioning of the RF transmitters are discussed. Transmitter installation experience and klystron conditioning experience is used to show how these design features have helped and continue to help the SNS linac to meet its availability and schedule goals. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Bradley, J (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1458 EP 1460 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600440 ER PT B AU Hardekopf, R Bernardin, J Billen, J Bultman, N Fox, W Hardek, T Hopkins, S Nath, S Rej, D Tallerico, P Young, L AF Hardekopf, R Bernardin, J Billen, J Bultman, N Fox, W Hardek, T Hopkins, S Nath, S Rej, D Tallerico, P Young, L BE Chew, J Lucas, P Webber, S TI Completion of CCL hot model for SNS-linac R&D program SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Los Alamos completed the R&D program for the SNS linac in September 2002 with publication of a comprehensive report on the SNS coupled-cavity linac (CCL) hot model [1]. In this paper we summarize the results of this R&D program, including design of the bridge-coupled CCL, refinement of the design through cold models, and fabrication and testing of a hot model. We describe the RF system used to power the model, the prototype water-cooling and vacuum systems, and the experimental tests of these systems, including low-power, high-power, and radiation measurements. The CCL hot-model experiments answered vital questions about design, manufacturability, and stability for this type of RF structure. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Hardekopf, R (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1461 EP 1463 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600441 ER PT B AU Doolittle, L Ratti, A Monroy, M Champion, M Ma, HJ AF Doolittle, L Ratti, A Monroy, M Champion, M Ma, HJ BE Chew, J Lucas, P Webber, S TI Operational performance of the SNS LLRF interim system SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A new approach has been taken to develop and build the Low-Level RF Control System for the SNS Front End and Linear Accelerators, as reported in a separate paper in this conference[1]. An interim version, based on the proven LBNL MEBT design, was constructed to support short-term goals and early commissioning of the Front End RFQ and DTL accelerators, while the final system[2] is under development. Additional units of the interim system are in use at JLab and LANL for concept testing, code development, and commissioning of SNS SRF cryomodules. The conceptual design of the MEBT system had already been presented elsewhere[3], and this paper will address operational experiences and performance measurements with the existing interim system hardware, including commissioning results at the SNS site for the Front End and DTL Tank 3 together with operational results from the JLab test stand. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Doolittle, L (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. OI Champion, Mark/0000-0002-5742-2568 NR 2 TC 0 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1464 EP 1466 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600442 ER PT B AU Murdoch, G Decarlo, A Henderson, S Kim, S Potter, K Roseberry, T Rank, J Raparia, D AF Murdoch, G Decarlo, A Henderson, S Kim, S Potter, K Roseberry, T Rank, J Raparia, D BE Chew, J Lucas, P Webber, S TI Beam dump window design for the spallation neutron source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Spallation Neutron Source accelerator systems will provide a 1 GeV, 1.44 MW proton beam to a liquid mercury target for neutron production. Beam tuning dumps are provided at the end of the linac (the Linac Dump) and in the Ring-to-Target transport line (the Extraction Dump) [1]. Thin windows are required to separate the accelerator vacuum from the poor vacuum upstream of the beam dump. There are several challenging engineering issues that have been addressed in the window design. Namely, handling of the high local power density deposited by the stripped electrons from the H- beam accelerated in the linac, and the need for low-exposure removal and replacement of an activated window. The thermal design of the linac dump window is presented, as is the design of a vacuum clamp and mechanism that allows remote removal and replacement of the window. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Murdoch, G (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 3 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1467 EP 1469 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600443 ER PT B AU Jordan, K Allison, T Coleman, J Evans, R Grippo, A AF Jordan, K Allison, T Coleman, J Evans, R Grippo, A BE Chew, J Lucas, P Webber, S TI Machine protection for high average current linacs SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A fully integrated Machine Protection System (MPS) is critical to efficient commissioning and safe operation of all high current accelerators. The Jefferson Lab FEL [1,2] has multiple electron beam paths and many different types of diagnostic insertion devices. The MPS [3] needs to monitor both the status of these devices and the magnet settings which define the beam path. The matrix of these devices and beam paths are programmed into gate arrays, the output of the matrix is an allowable maximum average power limit. This power limit is enforced by the drive laser for the photocathode gun. The Beam Loss Monitors (BLMs), RF status, and laser safety system status are also inputs to the control matrix. There are 8 Machine Modes (electron path) and 8 Beam Modes (average power limits) that define the safe operating limits for the FEL. Combinations outside of this matrix are unsafe and the beam is inhibited. The power limits range from no beam to 2 megawatts of electron beam power. The timing requirements for the BLMs and RF is similar to1 microsecond and for the insertion devices (viewers) is similar to1 millisecond. The entire system is VME based and EPICS compatible. This paper describes the system as it is installed on the JLab 10kW FEL. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Jordan, K (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. OI EVANS, ROBIN/0000-0002-7988-3189 NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1485 EP 1487 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600449 ER PT B AU Ozelis, JP AF Ozelis, JP CA Jefferson Lab SNS Project Team BE Chew, J Lucas, P Webber, S TI The Jefferson Lab quality assurance program for the SNS superconducting linac accelerator project SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB As part of a multi-laboratory collaboration, Jefferson Lab is currently engaged in the fabrication, assembly, and testing of 23 cryomodules for the superconducting linac portion of the Spallation Neutron Source (SNS) being built at Oak Ridge National Laboratory. As with any large accelerator construction project, it is vitally important that these components be built in a cost effective and timely manner, and that they meet the stringent performance requirements dictated by the project specifications. A comprehensive Quality Assurance (QA) program designed to help accomplish these goals has been implemented as an inherent component of JLab's SNS construction effort. This QA program encompasses the traditional spectrum of component performance, from incoming parts inspection, raw materials testing, through to sub-assembly and finished article performance evaluation. Additionally, process and procedure control, vendor performance and oversight, and design and test program reviews constitute complementary areas where QA involvement contributes to successful production performance. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Ozelis, JP (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1491 EP 1493 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600451 ER PT B AU Bookwalter, V Madre, B Ozelis, JP Reece, C AF Bookwalter, V Madre, B Ozelis, JP Reece, C BE Chew, J Lucas, P Webber, S TI Utilization of integrated process control, data capture, and data analysis in construction of accelerator systems SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Jefferson Lab has developed a web-based system that integrates commercial database, data analysis, document archiving and retrieval, and user interface software into a coherent knowledge management product called Pansophy. Pansophy provides key tools for the successful pursuit of major projects such as accelerator system development and construction by offering elements of process and procedure control, data capture and review, and data mining and analysis. Today, Pansophy is used in Jefferson Lab's SNS superconducting linac construction effort as a means for structuring and implementing the QA program, for process control and tracking, and for cryomodule test data capture and presentation/analysis. Development of Pansophy continues, with improvements to data queries and analysis functions that are the cornerstone of its utility. In this paper the present configuration and operational environment of Pansophy is described, along with future development goals. Additionally, specific examples of its use in an accelerator construction project will be presented. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Bookwalter, V (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1494 EP 1496 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600452 ER PT B AU Mokhov, NV Drozhdin, AI Kasper, PH Lackey, JR Prebys, EJ Webber, RC AF Mokhov, NV Drozhdin, AI Kasper, PH Lackey, JR Prebys, EJ Webber, RC BE Chew, J Lucas, P Webber, S TI Fermilab Booster beam collimation and shielding SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The beam power in the upgraded Booster at 8 GeV and 10 Hz will be 64 kW. Beam loss can result in high radiation loads in the ring. The purpose of a new beam halo cleaning system is to localize proton losses in specially shielded regions. Calculations show that this 2-stage collimation System will localize about 99% of beam loss in straight sections 6 and 7 and immediately downstream. Beam loss in the rest of the machine will be on average 0.1 W/m. Local shielding will provide tolerable prompt and residual radiation levels in the tunnel, above the tunnel at the surface and in the sump water. Results of thorough MARS calculations are presented for a new design which includes shielding integrated with the collimators, motors and controls ensuring a high performance and facilitating maintenance. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Mokhov, NV (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1503 EP 1505 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600455 ER PT B AU Nath, S Billen, J Stovall, J Takeda, H Young, LM Crandall, K Jeon, D AF Nath, S Billen, J Stovall, J Takeda, H Young, LM Crandall, K Jeon, D BE Chew, J Lucas, P Webber, S TI Particle-beam behavior in the SNS linac with simulated and reconstructed beams SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Spallation Neutron Source (SNS) project is a collaborative effort between Brookhaven, Argonne, Jefferson, Lawrence Berkeley, Los Alamos and Oak Ridge National Laboratories. Los Alamos has designed the entire linac for this accelerator complex. The final design of the SNS linac is comprised of both normal- and super-conducting RF (SRF) structures. The normal-conducting linac section up to 185 MeV, consists of a 2.5-MeV RFQ, a Medium Energy Beam Transfer (MEBT) line, a 402.5-MHz DTL, followed by a 805-MHz CCL. The SRF structure accelerates the beam from a nominal energy of 185 MeV to 1000 MeV. The SRF section consists of two, a medium beta (beta= 0.61), and a high beta (beta= 0.81) sections. The base-line design of the linac was done with a simulated beam at the input to the DTL. In this paper, we present the behavior of particle-beams originating at different locations upstream of the DTL. Input beams include a simulated beam at the input to the RFQ and a beam reconstructed from measurements. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Nath, S (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1515 EP 1517 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600459 ER PT B AU Celata, CM Bieniosek, FM Prost, L Seidl, PA Friedman, A Grote, DP AF Celata, CM Bieniosek, FM Prost, L Seidl, PA Friedman, A Grote, DP BE Chew, J Lucas, P Webber, S TI Particle-in-cell simulations of the high current experiment SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The particle-in-cell code WARP has been used to simulate beam dynamics for the intense ion beam of the High Current Experiment. First a study was done of the dynamic aperture of the alternating-gradient electrostatic quadrupole lattice of the experiment, including nonlinearity due to image forces and imperfections of the focusing lattice field. It was found that particle loss, rather than emittance growth, determined the usable aperture. Simulations of transport in the High Current Experiment were then performed, and the results compared to measured data. We present the results of both of these studies. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Celata, CM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1518 EP 1520 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600460 ER PT B AU Leitner, MA Celata, CM Lee, EP Logan, BG Sabbi, G Waldron, WL Barnard, JJ AF Leitner, MA Celata, CM Lee, EP Logan, BG Sabbi, G Waldron, WL Barnard, JJ BE Chew, J Lucas, P Webber, S TI Design choices for the integrated beam experiment (IBX) SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Over the next three years the research program of the Heavy Ion Fusion Virtual National Laboratory (HIF-VNL), a collaboration among LBNL, LLNL, and PPPL, is focused on separate scientific experiments in the injection, transport and focusing of intense heavy ion beams at currents from 100 mA to 1 A. As a next major step in the HIF-VNL program, we aim for a complete "source-to-target" experiment, the Integrated Beam Experiment (IBX). By combining the experience gained in the current separate beam experiments IBX would allow the integrated scientific study of the evolution of a high current (similar to1 A) single heavy ion beam through all sections of a possible heavy ion fusion accelerator: the injection, acceleration, compression, and beam focusing. This paper describes the main parameters and technology choices of the proposed IBX experiment. IBX will accelerate singly charged potassium or argon ion beams up to 10 MeV final energy and a longitudinal beam compression ratio of 10, resulting in a beam current at the target of more than 10 Amperes. The different accelerator cell design options are described in detail, in particular the induction core modules incorporating either room temperature pulsed focusing-magnets or superconducting magnets. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Leitner, MA (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 2 TC 2 Z9 2 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1521 EP 1523 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600461 ER PT B AU Aleksandrov, A Assadi, S Blokland, W Deibele, C Grice, W Pogge, J AF Aleksandrov, A Assadi, S Blokland, W Deibele, C Grice, W Pogge, J BE Chew, J Lucas, P Webber, S TI Beam in gap measurements at the SNS front-end SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The pulsed beam in the SNS accelerator has a fine time commissioning [3,4]. The same equipment proved to structure which consists of 695ns long mini-pulses seperated by 250ns gaps in order to minimize transient beam losses provide measurements with required dynamic range and time resolution as described below. beam losses in the accumulator ring which could arise during the ring extraction kicker rise time. This time structure is provided by a two stage Front End chopping system which must reduce the beam current in the gap to a level of 10(-4) of the nominal current in order to satisfy requirements on the ring extraction losses. A Beam-in-Gap measuring system based on H- stripping using Nd-YAG laser was developed and tested during the SNS Front-End commissioning period. This paper describes the Beam-in-Gap measurement system design and measured performance. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP Aleksandrov, A (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RI Grice, Warren/L-8466-2013; OI Grice, Warren/0000-0003-4266-4692 NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1524 EP 1526 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600462 ER PT B AU Barnes, CD O'Connell, C Decker, FJ Emma, P Hogan, MJ Iverson, P Krejcik, P Siemann, RH Walz, D Blue, B Clayton, CE Huang, C Johnson, D Joshi, C Marsh, KA Mori, WB Deng, S Katsouleas, T Muggli, P Oz, E AF Barnes, CD O'Connell, C Decker, FJ Emma, P Hogan, MJ Iverson, P Krejcik, P Siemann, RH Walz, D Blue, B Clayton, CE Huang, C Johnson, D Joshi, C Marsh, KA Mori, WB Deng, S Katsouleas, T Muggli, P Oz, E BE Chew, J Lucas, P Webber, S TI Improvements for the third generation Plasma Wakefield experiment E-164 at SLAC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The E-164 experiment at the Stanford Linear Accelerator Center is the third in a series investigating Plasma Wakefield Acceleration where the wake is driven by electron bunches. A collaboration between SLAC, UCLA and USC, E-164 has up to 2x10(10) electrons at 28.5GeV in 100 micron long bunches. These bunches enter a 30cm long Lithium plasma with density of 6x10(15) electrons/cm(3), where the transfer of energy from the head of the bunch to the tail takes place. In addition to acceleration, strong focusing, refraction of the electron beam and "betatron X-ray" production are all investigated. E-164 builds on related prior experiments, and its apparatus has evolved considerably. A third Optical Transition Radiator has been added for real time Twiss Parameter measurements which include the effects of scattering. The plasma cell is moved to the focus of the Final Focus Test Beam facility in order to increase bunch electron density. Spectrometry is extended with an upstream chicane in a dispersive region to produce synchrotron X-rays. Performance of these improvements and status of the experiment are discussed. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Barnes, CD (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 5 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1530 EP 1532 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600464 ER PT B AU Brown, KA Ahrens, L Bellavia, S Binello, S Brelsford, B DuMont, D Eng, W Gardner, C Gassner, D Glenn, JW Hammons, L Hock, J Hoff, L Hutchinson, E Jamilkowski, J Kling, N Kotlyar, Y Krishock, A Lockey, R Mapes, M Marneris, I Marr, G McNerney, A Meyer, A Morris, J Naylor, C Nemesure, S Phillips, D Rusek, A Ryan, J Shrey, T Snydstrup, L Tsoupas, N VanKuik, B Zahariou-Cohen, S Zeno, K AF Brown, KA Ahrens, L Bellavia, S Binello, S Brelsford, B DuMont, D Eng, W Gardner, C Gassner, D Glenn, JW Hammons, L Hock, J Hoff, L Hutchinson, E Jamilkowski, J Kling, N Kotlyar, Y Krishock, A Lockey, R Mapes, M Marneris, I Marr, G McNerney, A Meyer, A Morris, J Naylor, C Nemesure, S Phillips, D Rusek, A Ryan, J Shrey, T Snydstrup, L Tsoupas, N VanKuik, B Zahariou-Cohen, S Zeno, K BE Chew, J Lucas, P Webber, S TI Commissioning results of slow extraction of heavy ions from the AGS booster SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Brookhaven's AGS Booster has been modified to deliver slow extracted beam to a new beam line, the NASA Space Radiation Laboratory (NSRL). This facility was constructed in collaboration with NASA for the purpose of performing radiation effect studies for the NASA space program. The design of the resonant extraction system has been described in [1]. A more detailed description, which includes predictions of the slow extracted beam time structure has been described in [2]. In this report we will present results of the system commissioning and performance. C1 Brookhaven Natl Lab, CAD Dept, Upton, NY 11973 USA. RP Brown, KA (reprint author), Brookhaven Natl Lab, CAD Dept, Upton, NY 11973 USA. RI Hammons, Lee/D-6041-2013 OI Hammons, Lee/0000-0001-7066-8960 NR 6 TC 1 Z9 1 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1542 EP 1544 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600468 ER PT B AU Brown, K Ahrens, L Brennan, JM Glenn, JW Roser, T Russo, T Tsoupas, N Smith, K Zeno, K AF Brown, K Ahrens, L Brennan, JM Glenn, JW Roser, T Russo, T Tsoupas, N Smith, K Zeno, K BE Chew, J Lucas, P Webber, S TI Status of slow extraction of high intensity protons from Brookhaven's AGS SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Brookhaven AGS third integer resonant extraction system allows the AGS to provide high quality, high intensity 25.5 GeV/c proton beams simultaneously to four target stations and as many as 8 experiments. With the increasing intensities (over 7 x 10(13) protons/pulse) and associated longer spill periods (2.4 to 3 seconds long), we continue to run with low losses and high quality low modulation continuous current beams. We have an active program of high energy physics experiments, including the high precision measurement of the muons magnetic moment [1] and the discovery of the rare Kaon decay, K+ --> pi + vv [2] This program is continuing into the future with the rare symmetry violating process experiments [3] currently being designed to operate at the AGS. In this paper we will present results from operation of high intensity slow extraction, the problems we encounter, and our solutions to those problems. C1 Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. RP Brown, K (reprint author), Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1545 EP 1547 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600469 ER PT B AU Chou, W AF Chou, W CA Proton Driver Study Grp BE Chew, J Lucas, P Webber, S TI An 8-GeV synchrotron-based proton driver SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In January 2002, the Fermilab Director initiated a design study for a high average power, modest energy proton facility. Such a facility is a possible candidate for a construction project in the U.S. starting in the middle of this decade. The key technical element is a new machine, dubbed the "Proton Driver," as a replacement of the present Booster. The study of an 8-GeV synchrotron-based proton driver has been completed and published [1]. This paper will give a summary report, including machine layout and performance, optics, beam dynamics issues, technical systems design, civil construction, cost estimate and schedule. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Chou, W (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1551 EP 1553 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600471 ER PT B AU Chou, W Griffin, J MacLachlan, J Werkema, S AF Chou, W Griffin, J MacLachlan, J Werkema, S BE Chew, J Lucas, P Webber, S TI A new antiproton beam transfer scheme without coalescing SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB An effective way to increase the luminosity in the Fermilab Tevatron collider program Run2 is to improve the overall antiproton transfer efficiency. During antiproton coalescing in the Main Injector (MI), about 10-15% particles get lost. This loss could be avoided in a new antiproton transfer scheme that removes coalescing from the process. Moreover, this scheme would also eliminate emittance dilution due to coalescing. This scheme uses a 2.5 MHz RF system to transfer antiprotons from the Accumulator to the Main Injector. It is then followed by a bunch rotation in the MI to shorten the bunch length so that it can be captured by a 53 MHz RF bucket. Calculations and ESME simulations show that this scheme works. No new hardware is needed to implement this scheme. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Chou, W (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1554 EP 1556 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600472 ER PT B AU Rybarcyk, L AF Rybarcyk, L BE Chew, J Lucas, P Webber, S TI Longitudinal tracking studies for the AHF booster synchrotron SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The greenfield site option for the Advanced Hydrotest Facility (AHF) contains a 157-MeV H- linac followed by two synchrotrons, a booster and a 50-GeV main ring. Several different lattice designs are under consideration for the main ring while two different booster designs are presently being studied. The first booster is a 4-GeV synchrotron operating at h=1 with a 5-Hz cycle. The second is a 9-GeV machine operating at h=2 with a 1-Hz cycle. Both designs are required to deliver similar to3 x 10(12) p/bunch. A longitudinal painting scheme was employed during injection to enhance beam quality and capture during the initial portion of the ramp. The longitudinal beam dynamics simulations were performed with the tracking code ESME. The purpose of these studies was to investigate parameter space and obtain estimates for the rf system requirements. This paper presents the results of these studies. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Rybarcyk, L (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1566 EP 1568 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600476 ER PT B AU Henderson, S Assadi, S Cousineau, S Dodson, G Danilov, V Galambos, J Holmes, J Reece, K Shea, T Raparia, D Blaskiewicz, M Lee, YY Papaphilippou, Y AF Henderson, S Assadi, S Cousineau, S Dodson, G Danilov, V Galambos, J Holmes, J Reece, K Shea, T Raparia, D Blaskiewicz, M Lee, YY Papaphilippou, Y BE Chew, J Lucas, P Webber, S TI The commissioning plan for the spallation neutron source ring and transport lines SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Spallation Neutron Source (SNS) accelerator systems will provide a 1 GeV, 1.44 MW proton beam to a liquid mercury target for neutron production. In order to satisfy the accelerator systems' portion of the Critical Decision 4 (CD-4) commissioning goal (which marks the completion of the construction phase of the project), a beam pulse with intensity greater than 1x10(13) protons must be accumulated in the ring, extracted in a single turn and delivered to the target. A commissioning plan has been formulated for bringing into operation and establishing nominal operating conditions for the various ring and transport line subsystems as well as for establishing beam conditions and parameters which meet the commissioning goal. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP Henderson, S (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1569 EP 1571 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600477 ER PT B AU Henderson, S Cousineau, S Danilov, V Holmes, J McManamy, T Raparia, D Fedotov, A Lee, YY Wei, J AF Henderson, S Cousineau, S Danilov, V Holmes, J McManamy, T Raparia, D Fedotov, A Lee, YY Wei, J BE Chew, J Lucas, P Webber, S TI Exploration of beam fault scenarios for the spallation neutron source target SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Spallation Neutron Source (SNS) accelerator systems will provide a 1 GeV, 1.44 MW proton beam to a liquid mercury target for neutron production. In order to ensure adequate lifetime of the target system components, requirements on several beam parameters must be maintained. A series of error studies was performed to explore credible fault scenarios which can potentially violate the various beam-on-target parameters. The response of the beam-on-target parameters to errors associated with the phase-space painting process in the ring and field setpoint errors in all the ring-to-target beam transport line elements were explored and will be presented. The plan for ensuring beam-on-target parameters will also be described. C1 Oak Ridge Natl Lab, SNS Project, Oak Ridge, TN 37830 USA. RP Henderson, S (reprint author), Oak Ridge Natl Lab, SNS Project, Oak Ridge, TN 37830 USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1572 EP 1574 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600478 ER PT B AU Sekutowicz, J Beard, K Kneisel, P Wu, G Thomas, C Zheng, S AF Sekutowicz, J Beard, K Kneisel, P Wu, G Thomas, C Zheng, S BE Chew, J Lucas, P Webber, S TI Superstructures for high current FEL application SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The next generations of FELs at TJNAF will produce coherent light at power levels of 10 kW and 100 kW, respectively [1]. To achieve these power levels, 200 MeV electron beams of 10 mA and 100 mA have to be accelerated in the linear accelerators of the devices. The accelerators will be based on superconducting technology. Stable operation of these machines is only possible if the cavity Higher Order Modes (HOM) excited by the beams can sufficiently be damped. One of the possible accelerating structures which can fulfill this requirement, is a superstructure (SST) made of two weakly coupled subunits and equipped with appropriate HOM couplers. Based on the positive experience at DESY with 1.3 GHz superstructures, we are investigating for possible use similar structures in the linacs for the FEL upgrades. We have built a copper model of the proposed superstructure, based on two copper models of the 5-cell CEBAF cavities. This contribution presents measured results on this model. We are now in the process of fabrication a Nb prototype and hope to perform its cold test by the end of this year. C1 TJNAF, Newport News, VA 23606 USA. RP Sekutowicz, J (reprint author), TJNAF, Newport News, VA 23606 USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1575 EP 1577 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600479 ER PT B AU Doleans, M Kim, SH AF Doleans, M Kim, SH BE Chew, J Lucas, P Webber, S TI Insights in the physics of the dynamic detuning in SRF cavities and its active compensation SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Elliptical SRF cavities operated in pulsed mode experience dynamic Lorentz detuning because of the time varying radiation pressure. Due to the narrow electromagnetic bandwidth of these resonators, the induced detuning can severely affect their matching conditions to the RF feeding system. The active compensation scheme using piezoelectric tuners has proven to be a viable and attractive method to minimize the effects of the Lorentz detuning. To optimize this compensation, mechanical parameters are extracted for the action of the Lorentz forces and the piezoelectric tuner from both measurement and simulation. This process gives insights into the physics of the dynamic detuning, such as the nature of the coupling differences of both detuning sources, the possible settings for the measurement of the dynamic detuning with the methods to deduce mechanical parameters from them, and the origin of possible parasitic effects in the measurements. These issues are reported and discussed along with some ideas for the optimization of the detuning compensation. C1 Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37830 USA. RP Doleans, M (reprint author), Oak Ridge Natl Lab, SNS, POB 2008, Oak Ridge, TN 37830 USA. OI doleans, marc/0000-0003-4542-8724 NR 6 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1599 EP 1601 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600487 ER PT B AU Hahn, H Fischer, W Semertzidis, YK Warburton, DS AF Hahn, H Fischer, W Semertzidis, YK Warburton, DS BE Chew, J Lucas, P Webber, S TI Up-graded RHIC injection kicker system SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The design of the RHIC injection systems anticipated the possibility of filling and operating the rings with a 120 bunch pattern, corresponding to 110 bunches after allowing for the abort gap. Beam measurements during the 2002 run confirmed the possibility, although at the expense of severe transverse emittance growth and thus not on an operational basis. An improvement program was initiated with the goal of reducing the kicker rise time from I 10 to similar to95 ns and of minimizing pulse timing jitter and drift. The major components of the injection system are 4 kicker magnets and Blumlein pulsers using thyratron switches. The kicker terminating resistor and operating voltage was increased to reduce the rise time. Timing has been stabilized by using commercial trigger units and extremely stable de supplies for the thyratron reservoir. A fiber optical connection between control room and the thyratron trigger unit has been provided, thereby allowing the operator to adjust timing individually for each kicker unit. The changes were successfully implemented for use in the RHIC operation. C1 BNL, Upton, NY 11973 USA. RP Hahn, H (reprint author), BNL, Upton, NY 11973 USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1625 EP 1627 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600496 ER PT B AU Kirk, H Ludewig, H Mausner, L AF Kirk, H Ludewig, H Mausner, L BE Chew, J Lucas, P Webber, S TI Super-invar as a target for a pulsed high-intensity proton beam SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We describe measurements performed on samples consisting of the alloy Super-Invar, which is a candidate material for a robust solid target used in conjunction with an intense pulsed proton beam. A low coefficient of thermal expansion is the characteristic property which makes Super-Invar an attractive target candidate. We have irradiated our samples at the Brookhaven Linac Isotope Producer facility. Tests for variations of the thermal expansion coefficient as a function of inflicted radiation damage are described. The high radiation dose is severely detrimental to its low coefficient of thermal expansion. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kirk, H (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 2 TC 5 Z9 5 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1628 EP 1630 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600497 ER PT B AU Kirk, HG Iarocci, M Scaduto, J Weggel, RJ Mulholland, G Titus, P McDonald, KT AF Kirk, HG Iarocci, M Scaduto, J Weggel, RJ Mulholland, G Titus, P McDonald, KT BE Chew, J Lucas, P Webber, S TI A high-field pulsed solenoid magnet for liquid metal target studies SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The target system for a muon collider/neutrino factory requires the conjunction of an intense proton beam, a high-Z liquid target and a high-field solenoid magnet. We describe the design parameters for a pulsed solenoid, including the magnet cryogenic system and power supply, that can generate transient fields of greater than 10T with a flat-tops on the order of I second. It is envisioned to locate this device at the Brookhaven AGS for proof-of-principle testing of a liquid-jet target system with pulses of 10(13) protons. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kirk, HG (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1631 EP 1633 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600498 ER PT B AU Thieberger, P Kirk, HG Weggel, RJ McDonald, K AF Thieberger, P Kirk, HG Weggel, RJ McDonald, K BE Chew, J Lucas, P Webber, S TI Moving solid metallic targets for pion production in the muon collider/neutrino factory project SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The production of large fluxes of pions and muons using high-energy, high-intensity proton pulses impinging on solid or liquid targets presents unique problems which have not yet been entirely solved. We investigate the possibilities of using solid targets by choosing a metal of either extremely low thermal expansion coefficient or exceptionally high mechanical strength. Candidates are respectively Super-Invar and Vascomax 350 or Inconel 718. Moving targets in the form of chains or cables would be required for cooling purposes. These materials seem easily capable of surviving the beam pulses required for the largest beam power contemplated. Questions regarding radiation damage effects are being investigated. C1 BNL, Upton, NY USA. RP Thieberger, P (reprint author), BNL, Upton, NY USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1634 EP 1636 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600499 ER PT B AU Tsoupas, N Alessi, J Barton, D Ganetis, G Jain, A Lee, Y Marneris, I Meng, W Raparia, D Roser, T Ruggiero, A Tuozzolo, J Wanderer, P Weng, B AF Tsoupas, N Alessi, J Barton, D Ganetis, G Jain, A Lee, Y Marneris, I Meng, W Raparia, D Roser, T Ruggiero, A Tuozzolo, J Wanderer, P Weng, B BE Chew, J Lucas, P Webber, S TI Injection acceleration and extraction of high intensity proton beam for the "neutrino facility" project at BNL SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The proposed "neutrino-production" project[1,2] to be built at the Brookhaven National Laboratory (BNL) requires that the neutrino-production target be bombarded by a high intensity proton beam-pulse Of similar to90X10(12) protons of 28 GeV in energy and at a rate of 2.5 Hz, resulting in a I MW power of proton beam deposited on the target for the production of the neutrinos. In this paper we investigate the possibility of producing this high intensity proton beam, using as the main accelerator the Alternating Gradient Synchrotron (AGS) at the Brookhaven National Laboratory (BNL). The following aspects of the project are reported in this paper: a) The beam injection into the AGS synchrotron of 1.2 GeV H- beam produced by a super-conducting LINAC[3]; b) The effect of the eddy currents induced on the vacuum chamber of the circulating beam during the "ramping" of the main magnets of the AGS. c) The method of the beam extraction from the AGS and the optics of the 28 GeV beam extracted from the AGS. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Tsoupas, N (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 6 TC 1 Z9 1 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1637 EP 1639 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600500 ER PT B AU Zhang, W Ahrens, L Mi, J Oerter, B Sandberg, J Warburton, D AF Zhang, W Ahrens, L Mi, J Oerter, B Sandberg, J Warburton, D BE Chew, J Lucas, P Webber, S TI Advancement of the RHIC beam abort kicker system SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB As one of the most critical system for RHIC operation, the beam abort kicker system has to be highly available, reliable, and stable for the entire operating range. Along with the RHIC commission and operation, consistent efforts have been spend to cope with immediate issues as well as inherited design issues. Major design changes have been implemented to achieve the higher operating voltage, longer high voltage hold-off time, fast re-triggering and redundant triggering, and improved system protection, etc. Recent system test has demonstrated for the first time that both blue ring and yellow ring beam abort systems have achieved more than 24 hours hold off time at desired operating voltage. In this paper, we report on the system status and improvements. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Zhang, W (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1640 EP 1642 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600501 ER PT B AU Marchionni, A Anderson, TG Foster, GW Gattuso, C Hu, M Johnson, DE Johnstone, CJ Mishra, CS Oleck, AR Piekarz, H Syphers, M Yang, MJ AF Marchionni, A Anderson, TG Foster, GW Gattuso, C Hu, M Johnson, DE Johnstone, CJ Mishra, CS Oleck, AR Piekarz, H Syphers, M Yang, MJ BE Chew, J Lucas, P Webber, S TI Performance of antiproton injection and extraction transfer lines of the Recycler Ring at Fermilab SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Recycler Ring, an 8 GeV antiproton accumulator, is being commissioned at Fermilab. Antiproton transfers in and out of the Recycler Ring take place through two transfer lines connecting the Recycler to the Main Injector. Transfer line layout and operation of beam transfers will be described. Particular attention has been paid to injection mismatch effects, in order to limit emittance growth during transfers. A considerable improvement has been achieved by removing vacuum windows, previously present in both transfer lines. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Marchionni, A (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1649 EP 1651 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600504 ER PT B AU Moore, C Anderson, J Ducar, R Ford, R Kobilarcik, T Prebys, E Russell, A Stefanski, R Monroe, J AF Moore, C Anderson, J Ducar, R Ford, R Kobilarcik, T Prebys, E Russell, A Stefanski, R Monroe, J BE Chew, J Lucas, P Webber, S TI Initial operation of the Fermilab MiniBooNE beamline SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The MiniBooNE neutrino experiment is projected to take more intensity in a single year than was delivered during the seventeen years of running the Fixed Target Program. The experiment will require almost continuous running (18,000 pulses/hour) at full intensity (5E12 protons per pulse). In order to safely handle this intensity various measures have been instituted. The design of the beamline ensures sufficient clearance between the beam and apertures. A MiniBooNE Beam Permit System has been installed that is able to check various digital and analogue information against nominal values on a pulse by pulse basis. An automated total beam loss monitoring system (electronic berm) measures any beam loss between the beginning and end of the line. An automated correction system (Autotune) finds and corrects minor beam wandering. A description of the beamline design and relevant instrumentation is given. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Moore, C (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 1 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1652 EP 1654 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600505 ER PT B AU Hardekope, R Kurennoy, S Power, J Roybal, R Schrage, D Sherwood, R Collins, S AF Hardekope, R Kurennoy, S Power, J Roybal, R Schrage, D Sherwood, R Collins, S BE Chew, J Lucas, P Webber, S TI Fabrication of the MEBT chopper system for the spallation neutron source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Los Alamos completed design, fabrication, procurement, and initial testing (without beam) of the SNS medium-energy beam-transport (MEBT) chopper, including the meander-line traveling-wave structure and the electrical-pulser system. This report reviews the design parameters and. discusses the fabrication process for the chopper structures, including measurements of the impedance and rise time. (The MEBT vacuum system and chopper-target beam stop were developed at and reported by LBNL.) We discuss the specifications for the pulse generator and its fabrication and testing at Directed Energy, Inc. of Ft. Collins, CO. Experimental tests of the chopper system are currently being performed at the SNS site at ORNL and will be reported separately. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Hardekope, R (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1661 EP 1663 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600508 ER PT B AU Valdiviez, R Sigler, F Barlow, D Blind, B Jason, A Mottershead, T Gomez, J Espinoza, C AF Valdiviez, R Sigler, F Barlow, D Blind, B Jason, A Mottershead, T Gomez, J Espinoza, C BE Chew, J Lucas, P Webber, S TI The mechanical design of a proton microscope for radiography at 800 MeV SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A proton microscope has been developed for radiography applications using the 800-MeV linear accelerator at the Los Alamos Neutron Science Center (LANSCE). The microscope provides a magnified image of a static device, or of a dynamic event such as a high-speed projectile impacting a target. The microscope assembly consists primarily of four Permanent Magnet Quadrupoles (PMQ's) that are supported on movable platforms. The platform supports, along with the rest of the support structure, are designed to withstand the residual dynamic loads that are expected from the dynamic tests. This paper covers the mechanical design of the microscope assembly, including the remote positioning system that allows for fine-tuning the focus of an object being imaged. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Valdiviez, R (reprint author), Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1664 EP 1666 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600509 ER PT B AU Kaganovich, ID Startsev, EA Davidson, RC AF Kaganovich, ID Startsev, EA Davidson, RC BE Chew, J Lucas, P Webber, S TI Ionization cross sections for ion-atom collisions in high energy ion beams SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID CHARGED IONS AB Knowledge of ion-atom ionization cross sections is of great importance for many accelerator applications. When experimental data and theoretical calculations are not available, approximate formulas are frequently used. Based on experimental data and theoretical predictions, a new fit for ionization cross sections by fully stripped ions is proposed. The Born approximation and classical trajectory calculations are frequently used to estimate the cross sections. Neither approximation is expected to be valid over the entire range of projectile ions and target atoms. Aspects of both models must be included in order to address the shortcomings in the underlying assumptions. A large difference in cross section, up to a factor of six, calculated in quantum mechanics and classical mechanics, has been obtained for 3.2GeV I- and Cs+ ions. Because at such high velocities the Born approximation is well validated, the classical trajectory approach fails to correctly predict the stripping cross section at high energies for electron orbitals with low ionization potential. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Kaganovich, ID (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1667 EP 1669 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600510 ER PT B AU Drees, A Ahrens, L Fliller, R Fu, W Heppner, G Kain, V AF Drees, A Ahrens, L Fliller, R Fu, W Heppner, G Kain, V BE Chew, J Lucas, P Webber, S TI Abort gap studies and cleaning during RHIC heavy ion operation SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Since the RHIC Au-Au run in the year 2001 the 200 MHz cavity system was used at storage and a 28 MHz system during injection and acceleration. The rebucketing procedure causes significant debunching of heavy ion beams in addition to amplifying debunching due to other mechanisms. At the end of a four hour store, debunched beam can account for more than 30% of the total beam intensity. In order to minimize the risk of magnet quenching due to uncontrolled beam losses at the time of a beam dump, a combination of a fast transverse kicker and copper collimators were used to clean the abort gap. This report gives an over-view of the upgraded gap cleaning procedure and the achieved performance. The upgraded procedure in conjunction with a new application allows to measure properties of the debunched beam routinely. C1 BNL, Upton, NY 11973 USA. RP Drees, A (reprint author), BNL, Upton, NY 11973 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1685 EP 1687 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600516 ER PT B AU Drees, A Xu, ZB Fox, B Huang, HB AF Drees, A Xu, ZB Fox, B Huang, HB BE Chew, J Lucas, P Webber, S TI Results from Vernier Scans at RHIC during the pp run 2001-2002 SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Using the Vernier Scan or Van der Meer Scan technique, where one beam is swept stepwise across the other while measuring the collision rate as a function of beam displacement, the transverse beam profiles, the luminosity and the cross section can be measured. Data and results from the polarized proton run in the year 2001/02 are presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Drees, A (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1688 EP 1690 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600517 ER PT B AU Fliller, RR Drees, A Gassner, D Hammons, L McIntyre, G Peggs, S Trbojevic, D Biryukov, V Chesnokov, Y Terekhov, V AF Fliller, RR Drees, A Gassner, D Hammons, L McIntyre, G Peggs, S Trbojevic, D Biryukov, V Chesnokov, Y Terekhov, V BE Chew, J Lucas, P Webber, S TI New results from crystal collimation at RHIC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In this paper, we discuss new results from the use of the crystal collimator from the 2003 run. The yellow ring of the Relativistic Heavy Ion Collider (RHIC) has a bent crystal collimator. By properly aligning the crystal to the beam halo, particles entering the crystal are deflected away from the beam and intercepted downstream in a copper scraper. The purpose of a bent crystal is to improve the collimation efficiency as compared to a scraper alone. We compare these results to previous data, simulation, and theoretical predictions. C1 BNL, Upton, NY 11793 USA. RP Fliller, RR (reprint author), BNL, Upton, NY 11793 USA. RI Hammons, Lee/D-6041-2013; OI Hammons, Lee/0000-0001-7066-8960; Biryukov, Valery/0000-0002-3591-7762 NR 10 TC 3 Z9 3 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1691 EP 1693 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600518 ER PT B AU Kewisch, J Montag, C AF Kewisch, J Montag, C BE Chew, J Lucas, P Webber, S TI Commissioning of a first-order transition jump in RHIC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB When accelerating gold ions in the Relativistic Heavy Ion Collider (RHIC) the transition energy must be crossed. RHIC uses a set of special quadrupoles and power supplies which can reverse polarity in less than 40 milliseconds. These quadrupoles are used to produce dispersion bumps which increase the transition energy as the beam approaches transition. The change of polarity will then jump the transition energy across the beam energy. This paper describes the commissioning of the RHIC transition crossing system. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kewisch, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1694 EP 1696 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600519 ER PT B AU MacKay, WW Ahrens, L Bai, M Courant, ED Fischer, W Huang, H Luccio, AU Montag, C Pilat, F Ptitsyn, V Roser, T Satogata, T Trbojevic, D van Zeijts, J AF MacKay, WW Ahrens, L Bai, M Courant, ED Fischer, W Huang, H Luccio, AU Montag, C Pilat, F Ptitsyn, V Roser, T Satogata, T Trbojevic, D van Zeijts, J BE Chew, J Lucas, P Webber, S TI Commissioning spin rotators in RHIC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB During the summer of 2002, eight superconducting helical spin rotators were installed into RHIC in order to control the polarization directions independently at the STAR and PHENIX experiments. Without the rotators, the orientation of polarization at the interaction points would only be vertical. With four rotators around each of the two experiments, we can rotate either or both beams from vertical into the horizontal plane through the interaction region and then back to vertical on the other side. This allows independent control for each beam with vertical, longitudinal, or radial polarization at the experiment. In this paper, we present results from the first run using the new spin rotators at PHENIX. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP MacKay, WW (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 3 TC 6 Z9 6 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1697 EP 1699 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600520 ER PT B AU Montag, C Kewisch, J Bruno, D Ganetis, G Louie, W AF Montag, C Kewisch, J Bruno, D Ganetis, G Louie, W BE Chew, J Lucas, P Webber, S TI Design of a fast chromaticity jump in RHIC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB During transition crossing in the Relativistic Heavy Ion Collider (RHIC), chromaticities have to change sign. This sign change is partially accomplished by the gamma(t) quadrupole jump; however, the resulting chromaticity jump is only Deltaxi(x) = 2.1 in the horizontal and Deltaxi(y) = 2.4 in the vertical plane. To increase the jump height, a dedicated chromaticity jump scheme has been designed, consisting of fast power supplies connected to six sextupoles per ring, which is capable of providing a chromaticity jump of Deltaxi = 6. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Montag, C (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1700 EP 1702 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600521 ER PT B AU Pilat, F Binello, S Cameron, P Ptitsyn, V AF Pilat, F Binello, S Cameron, P Ptitsyn, V BE Chew, J Lucas, P Webber, S TI Non-linear effects in the RHIC interaction regions: Measurement and correction SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A technique for measuring and correcting locally nonlinear effects arising from field errors and feed-down from the interaction region (IR) triplets has been developed at RHIC. After a brief review of the method, we will compare measurements taken with different IR optics configurations, with beta at the interaction point ranging from 3 to I in. The beam data are compared with results from a realistic RHIC model, which includes measured field errors in the magnets, and simulates operational effects and corrections. A control room application has been developed for the RHIC run 2003 that allows faster measurements of non-linear effects, online plotting and fitting of non-linear terms from measurements of-tune shift as a function of orbit bump amplitude. Results for local non-linear correction during run 2003 are presented. C1 BNL, Upton, NY USA. RP Pilat, F (reprint author), BNL, Upton, NY USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1703 EP 1705 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600522 ER PT B AU Satogata, T Ahrens, L Bai, M Beebe-Wang, J Blaskiewicz, M Brennan, JM Brown, KA Bruno, D Cameron, P Cardona, J Connolly, R Drees, A Fischer, W Fliller, RP Ganetis, G Gardner, C Glenn, JW Hahn, H Hayes, T Huang, H Iriso-Ariz, U MacKay, WW Marusic, A Michnoff, R Montag, C Pilat, F Ptitsyn, V Roser, T Smith, K Tepikian, S Trbojevic, D Tsoupas, N Zhang, SY van Zeijts, J AF Satogata, T Ahrens, L Bai, M Beebe-Wang, J Blaskiewicz, M Brennan, JM Brown, KA Bruno, D Cameron, P Cardona, J Connolly, R Drees, A Fischer, W Fliller, RP Ganetis, G Gardner, C Glenn, JW Hahn, H Hayes, T Huang, H Iriso-Ariz, U MacKay, WW Marusic, A Michnoff, R Montag, C Pilat, F Ptitsyn, V Roser, T Smith, K Tepikian, S Trbojevic, D Tsoupas, N Zhang, SY van Zeijts, J BE Chew, J Lucas, P Webber, S TI Commissioning of RHIC deuteron-gold collisions SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Deuteron and gold beams have been accelerated to a collision energy of roots = 200 GeV/u in the Relativistic Heavy Ion Collider (RHIC), providing the first asymmetric-species collisions of this complex. Necessary changes for this mode of operation include new ramping software and asymmetric crossing angle geometries. This paper reviews machine performance, problems encountered and their solutions, and accomplishments during the 16 weeks of ramp-up and operations. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Satogata, T (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 1 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1706 EP 1708 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600523 ER PT B AU Simos, N Kirk, H Kahn, S Carrola, A Ludewig, HB Weng, WT Diwan, M Raparia, D McDonald, K Evangelakis, G AF Simos, N Kirk, H Kahn, S Carrola, A Ludewig, HB Weng, WT Diwan, M Raparia, D McDonald, K Evangelakis, G BE Chew, J Lucas, P Webber, S TI Concept design of the target/horn system for the BNL neutrino oscillation experiment SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The design concept for the integration of the target and the focusing horn system for the proposed BNL neutrino oscillation experiment is described in this paper. Also presented are issues associated with the functionality and thermo-mechanical response of the selected target intercepting the 28 GeV protons of the 1 MW upgraded AGS beam, the loading and mechanical response of the focusing hom subjected to high currents and energy deposited due to beam/target interaction, the integration of the two systems, and the heat removal schemes. The proposed target intercepts the 8.9x10(13), 28 GeV protons with a 2.5 Hz cycle time over a spot that encloses the 3sigma of the beam. In the baseline design the inner conductor of the aluminum hom encloses the target while allowing for an annular space for forced cooling. Approximately 250 kA pulse of current of 20mus duration will flow through the hom at 2.5 Hz repetition rate inducing high compressive forces, vibration and heat. The paper addresses these issues of hom mechanical response, heat removal scenario, and useful life estimation including radiation damage. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Simos, N (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1709 EP 1711 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600524 ER PT B AU Tepikian, S Huang, H MacKay, W Pilat, F Ptitsyn, V Satogata, T Trbojevic, D van Zeijts, J AF Tepikian, S Huang, H MacKay, W Pilat, F Ptitsyn, V Satogata, T Trbojevic, D van Zeijts, J BE Chew, J Lucas, P Webber, S TI High luminosity beta*=0.5m RHIC insertions SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB An increase in RHIC collision luminosity is possible by reducing the beam size at the interaction point (IP). We present a method for reducing the IP beta function, beta(*), from the design minimum of 1m to 0.5m. We demonstrate that this beta(*)=0.5m configuration is achievable with existing RHIC power supplies for 100GeV protons. We discuss the correction of the higher order IR multi-poles and the second order chromaticity. C1 BNL, Upton, NY USA. RP Tepikian, S (reprint author), BNL, Upton, NY USA. NR 1 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1712 EP 1714 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600525 ER PT B AU Ahrens, L Alessi, J Benjamin, J Blaskiewicz, M Brennan, JM Brown, KA Carlson, C DeLong, J D'Ottavio, T Frak, B Gardner, CJ Glenn, JW Harvey, M Hayes, T Hseuh, HC Ingrassia, P Lowenstein, D Mackay, W Marr, G Morris, J Roser, T Satogata, T Smith, G Smith, KS Steski, D Tsoupas, N Thieberger, P Zeno, K Zhang, SY AF Ahrens, L Alessi, J Benjamin, J Blaskiewicz, M Brennan, JM Brown, KA Carlson, C DeLong, J D'Ottavio, T Frak, B Gardner, CJ Glenn, JW Harvey, M Hayes, T Hseuh, HC Ingrassia, P Lowenstein, D Mackay, W Marr, G Morris, J Roser, T Satogata, T Smith, G Smith, KS Steski, D Tsoupas, N Thieberger, P Zeno, K Zhang, SY BE Chew, J Lucas, P Webber, S TI The RHIC injector accelerator configurations, and performance for the RHIC 2003 Au-d physics run SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The RHIC 2003 Physics Run [1] required collisions between gold ions and deuterons. The injector necessarily had to deliver adequate quality (transverse and longitudinal emittance) and quantity of both species. For gold this was a continuing evolution from past work [2]. For deuterons it was new territory. For the filling of the RHIC the injector not only had to deliver quality beams but also had to switch between these species quickly. This paper details the collider requirements and our success in meeting these. Some details of the configurations employed are given. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Ahrens, L (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1715 EP 1717 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600526 ER PT B AU Drozhdin, AI Lebedev, VA Mokhov, NV Nicolas, LY Striganov, SI Tollestrup, AV AF Drozhdin, AI Lebedev, VA Mokhov, NV Nicolas, LY Striganov, SI Tollestrup, AV BE Chew, J Lucas, P Webber, S TI Beam loss and backgrounds in the CDF and do detectors due to nuclear elastic beam-gas scattering SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Detailed simulations were performed on beam loss rates in the vicinity of the Tevatron Collider detectors due to beam-gas nuclear elastic interactions. It turns out that this component can drive the accelerator-related background rates in the CDF and DO detectors, exceeding those due to outscattering from collimation system, inelastic beam-gas interactions and other processes [1, 2]. Results of realistic simulations with the STRUCT and MARS codes are presented for the interaction region components and the CDF and DO detectors. It is shown that a steel mask placed upstream of the detectors can reduce the background rates by almost an order of magnitude. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Drozhdin, AI (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1733 EP 1735 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600532 ER PT B AU Koba, K Berenc, T Barnes, B Chase, B Kourbanis, I MacLachlan, J Meisner, K Steimel, J AF Koba, K Berenc, T Barnes, B Chase, B Kourbanis, I MacLachlan, J Meisner, K Steimel, J BE Chew, J Lucas, P Webber, S TI Slip stacking experiments at Fermilab Main Injector SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In order to achieve an increase in proton intensity, Fermilab Main Injector will use a stacking process called "slip stacking"[1]. The intensity will be doubled by injecting one train of bunches at a slightly lower energy, another at a slightly higher energy, then bringing them together for the final capture. Beam studies have started for this process and we have already verified that, at least for a low beam intensity, the stacking procedure works as expected[2][3][4]. For high intensity operation, development work of the feedback and feedforward systems is under way[5] [6] [7]. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Koba, K (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 8 TC 6 Z9 6 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1736 EP 1738 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600533 ER PT B AU Lebrun, P Lebedev, VA Shiltsev, V Slaughter, J AF Lebrun, P Lebedev, VA Shiltsev, V Slaughter, J BE Chew, J Lucas, P Webber, S TI Observations on the luminosity lifetimes and emittance growth rates at the tevatron SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A record luminosity of 4.2 10(31) has been reached at the Fermilab p - (p) over bar collider. The lifetime of this luminosity at the beginning of the store is about 10 hours. This lifetime can be explained by the measured loss of anti-protons and protons due to collisions and emittance growths. We report on transverse emittance growth rates based on our Synchrotron Light Monitor. Longitudinal emittance growth rate measurements are based on the TeV Sampled Bunch Display data. It is shown that Intra Beam Scattering is a significant source of emittance growth rates. We comment on other possible factors for these observed emittance growth rates. Finally, we comment on future luminosity lifetimes, as we hope to further increase our peak luminosity. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Lebrun, P (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1739 EP 1741 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600534 ER PT B AU Mokhov, NV Rakhno, IL Kerby, JS AF Mokhov, NV Rakhno, IL Kerby, JS BE Chew, J Lucas, P Webber, S TI Mitigation of effects of beam-induced energy deposition in the LHC high-luminosity interaction regions SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Beam-induced energy deposition in the LHC high luminosity interaction region components is one of the serious limits for the machine performance. The results of further optimization and comprehensive MARS 14 calculations in the IPI and IP5 inner and outer triplets are summarized for the updated lattice, calculation model, baseline pp-collision source term, and for realistic engineering constraints on the hardware design. It is shown that the optimized layout and absorbers would provide a sufficient reduction of peak power density and dynamic heat load in the superconducting components with an adequate safety margin. Accumulated dose and residual dose rates in and around the region components are also kept below the tolerable limits in the proposed design. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Mokhov, NV (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1745 EP 1747 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600536 ER PT B AU Mokhov, NV Kashikhin, VV Rakhno, IL Strait, JB Yadav, S Zlobin, AV Gupta, R Harrison, M Bruning, OS Ruggiero, F AF Mokhov, NV Kashikhin, VV Rakhno, IL Strait, JB Yadav, S Zlobin, AV Gupta, R Harrison, M Bruning, OS Ruggiero, F BE Chew, J Lucas, P Webber, S TI Energy deposition limits in a Nb3Sn separation dipole in front of the LHC high-luminosity inner triplet SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Interaction region inner triplets are among the systems which may limit the LHC performance. An option for a new higher luminosity IR is a double-bore inner triplet with separation dipoles placed in front of the first quadrupole. The radiation load on the first dipole, resulting from pp-interactions, is a key parameter to determine the feasibility of this approach. Detailed energy deposition calculations were performed with the MARS14 code for two Nb3Sn dipole designs with no superconductor on the mid-plane. Comparison of peak power densities with those in the baseline LHC IR suggests that it may be possible to develop workable magnets for luminosities up to 10(35) CM-2 S-1. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Mokhov, NV (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1748 EP 1750 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600537 ER PT B AU Moore, R Balbekov, V Jansson, A Lebedev, V Ng, KY Shiltsev, V Tan, CY AF Moore, R Balbekov, V Jansson, A Lebedev, V Ng, KY Shiltsev, V Tan, CY BE Chew, J Lucas, P Webber, S TI Longitudinal bunch dynamics in the tevatron SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We present our observations of the longitudinal bunch dynamics in Tevatron for uncoalesced proton bunches at 150 GeV and coalesced proton bunches at 150 GeV and 980 GeV. We have observed long-term (>15 minutes) coherent oscillations of uncoalesced protons that preserve already existing oscillations from upstream accelerators. A single-bunch instability in large intensity protons bunches at 980 GeV has also been observed. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Moore, R (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1751 EP 1753 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600538 ER PT B AU Zhang, XL Sen, T Shiltsev, V Xiao, MQ Alexahin, Y Schmidt, F Zimmermann, F AF Zhang, XL Sen, T Shiltsev, V Xiao, MQ Alexahin, Y Schmidt, F Zimmermann, F BE Chew, J Lucas, P Webber, S TI Experimental studies of beam-beam effects in the tevatron SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The long-range beam-beam interactions limit the achievable luminosity in the Tevatron. During the past year several studies were performed on ways of removing the limitations at all stages of the operational cycle. We report here on some of these studies, including the effects of changing the helical orbits at injection and collision, tune and chromaticity scans and coupling due to the beam-beam interactions. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Zhang, XL (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 8 TC 4 Z9 4 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1757 EP 1759 DI 10.1109/ICMLC.2003.1259781 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600540 ER PT B AU Slaughter, J Estrada, J Genser, K Jansson, A Lebrun, P Yun, JC Lai, S AF Slaughter, J Estrada, J Genser, K Jansson, A Lebrun, P Yun, JC Lai, S BE Chew, J Lucas, P Webber, S TI Tevatron run II luminosity, emittance and collision point size SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We compare the Tevatron luminosity as measured by the CDF and D0 experiments with that computed from machine characteristics. We also compare the CDF measurements of the size of the interaction region with that predicted by machine parameters. Although these results are still preliminary, they show promise as a useful crosscheck of the instrumentation and our understanding of the Tevatron machine characteristics. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Slaughter, J (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 5 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1763 EP 1765 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600542 ER PT B AU Foster, GW Glass, HD Gattuso, C Johnson, DE Mishra, CS Volk, JT Yang, MJ AF Foster, GW Glass, HD Gattuso, C Johnson, DE Mishra, CS Volk, JT Yang, MJ BE Chew, J Lucas, P Webber, S TI Correction magnets for the Fermilab Recycler ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In the commissioning of the Fermilab Recycler ring the need for higher order corrector magnets in the regions near beam transfer lines was discovered. Three types of permanent magnet skew quadrupoles, and two types of permanent magnet sextupoles were designed and built. This paper describes the need for these magnets, the design, assembly, and magnetic measurements. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Foster, GW (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1766 EP 1768 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600543 ER PT B AU Wu, V Bhat, CM MacLachlan, JA Chase, B Meisner, K Dey, J Reid, J AF Wu, V Bhat, CM MacLachlan, JA Chase, B Meisner, K Dey, J Reid, J BE Chew, J Lucas, P Webber, S TI Antiproton acceleration in the Fermilab Main Injector using 2.5 MHz (H=28) and 53 MHz (H=588) RF systems SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB During the Run II era at Fermilab, the Recycler stores antiprotons at 8 GeV and the Main Injector accelerates the antiprotons and the protons from 8 GeV to 150 GeV for Tevatron injection. The Recycler injects antiprotons to the Main Injector in 2.5 MHz rf buckets. This report presents an acceleration scheme for the antiprotons that involves a slow ramp with initial 2.5 MHz acceleration and subsequent fast acceleration with 53 MHz rf system. Beam acceleration and rf manipulation with space charge and beam loading effects are simulated using the longitudinal simulation code ESME [1]. Simulation suggests that one can expect about 15% emittance growth for the entire acceleration cycle with beam loading compensations. Preliminary experimental results with proton beam will also be presented. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Wu, V (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1769 EP 1771 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600544 ER PT B AU Xiao, M Erdelyi, B Sen, T AF Xiao, M Erdelyi, B Sen, T BE Chew, J Lucas, P Webber, S TI Tevatron beam-beam simulations at injection energy SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Major issues at Tevatron injection are the effects of 72 long-range beam-beam interactions together with the machine nonlinearity on protons and anti-protons. We look at particle tracking calculations of Dynamic Aperture(DA) under present machine conditions. Comparisons of calculations with observations and experiments are also presented in this report. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Xiao, M (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1772 EP 1774 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600545 ER PT B AU Xiao, M Sen, T Schmidt, F AF Xiao, M Sen, T Schmidt, F BE Chew, J Lucas, P Webber, S TI Simulations of octupole compensation of head-tail instability at the Tevatron SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The proton lifetime in the Tevatron depends sensitively on chromaticities. Too low chromaticities can make the beam unstable due to the weak head-tail instability. One way to compensate this effect is to introduce octupoles to create a larger amplitude dependent betatron tune spread. However, the use of octupoles will also introduce additional side effects such as second order chromaticity, differential tune shifts and chromaticities on both proton and anti-proton helices. The non-linear effects may also reduce the dynamic aperture. We report on a simulation study to find the best combinations of polarities and strengths of the octupoles. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Xiao, M (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1775 EP 1777 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600546 ER PT B AU Zhang, X Shiltsev, V Zimmermann, C Bishofberger, K AF Zhang, X Shiltsev, V Zimmermann, C Bishofberger, K BE Chew, J Lucas, P Webber, S TI The special applications of Tevatron Electron Lens in collider operation SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Besides the Tevatron Electron Lens (TEL) runs as a R&D project for Tevatron Beam-Beam Compensation [1], it is used daily as a Beam Abort Gap Cleaner for collider operations. It can also serve as beam exciter for beam dynamics measurements and as a slow proton or antiproton bunch remover. This report describes all these applications and related observations. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Zhang, X (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 2 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1778 EP 1780 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600547 ER PT B AU Zhang, X Crisp, J Fitzgerald, J Kuznetsov, G Olson, M Pfeffer, H Saewert, G Semenov, A Shiltsev, V Solyak, N Wildman, D Bishofberger, K Kashtanov, E Kozub, S Tkachenko, L Sytnik, V Tiunov, M AF Zhang, X Crisp, J Fitzgerald, J Kuznetsov, G Olson, M Pfeffer, H Saewert, G Semenov, A Shiltsev, V Solyak, N Wildman, D Bishofberger, K Kashtanov, E Kozub, S Tkachenko, L Sytnik, V Tiunov, M BE Chew, J Lucas, P Webber, S TI Upgrades of the Tevatron Electron Lens SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB This paper will describe the main upgrades of the Tevatron Electron Lens (TEL) during the year 2003. The bending angle of the electron beam entrance and exit to the main solenoid will be decreased from 90 degrees to 53 degrees and three more solenoids will be added to each of the two bends, which will allow us to control the electron beam size more freely. A new gun will also be installed which will give us a Gaussian transverse beam distribution in addition to the flat beam with much smoother edge to minimize the nonlinear effect of the beam-beam force. In addition, a new BPM system will be installed to let us have more precise beam position measurements for proton, antiproton and electron beams. A knife-edge beam profile measurement system will replace the space-consuming scanning wires. We expect that these upgrages will improve the ability to increase the lifetime of the (anti)proton beam during beam-beam compensation operation. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Zhang, X (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 1 TC 4 Z9 4 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1781 EP 1783 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600548 ER PT B AU Liu, W Jing, C Gai, W Konecny, R Power, JG AF Liu, W Jing, C Gai, W Konecny, R Power, JG BE Chew, J Lucas, P Webber, S TI New RF design for 11.4GHz dielectric loaded accelerator SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB paper we present a new solution for externally RF coupled dielectric loaded accelerator. In this scheme, a separate TE-TM converter is used for RF coupling and a short tapered section is used for matching the RF into the dielectric accelerating structure. Advantages of this new design are there is no dielectric presented near the coupler, thus less prune to premature breakdowns; and it can be made into separate modules of coupler, matching and accelerating structures, this will simplified the dielectric structure development because only one set of couplers is required for a defined RF frequency but with many different dielectric structures. An example of X-band 11.424 GHz coupler and dielectric accelerating structure is obtained via EM simulations. Based on the simulation results, a set of coupler, matching and dielectric structures were fabricated. We present bench measurement results and its comparison with the design. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Liu, W (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 10 TC 8 Z9 8 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1810 EP 1812 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600558 ER PT B AU Power, JG Gai, W Lewellen, J Milton, S Kim, KJ Simpson, J Wang, H Finley, D Carter, H AF Power, JG Gai, W Lewellen, J Milton, S Kim, KJ Simpson, J Wang, H Finley, D Carter, H BE Chew, J Lucas, P Webber, S TI A compact wakefield measurement facility SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The conceptual design of a compact, photoinjector-based, facility for high precision measurements of wakefields is presented. This work is motivated by the need for a thorough understanding of beam induced wakefield effects for any future linear collider. We propose to use a high brightness photoinjector to generate (approximately) a 2 nC, 2 mm-mrad drive beam at 20 MeV to excite wakefields and a second photoinjector to generate a 5 MeV, variably delayed, trailing witness beam to probe both the longitudinal and transverse wakefields in the structure under test. Initial estimates show that we can detect a niinimum measurable dipole transverse wake function of 0.1 V/pC/m/mm and a minimum measurable monopole longitudinal wake function of 2.5 V/pC/m. Simulations results for the high brightness photoinjector, calculations of the facility's wakefield measurement resolution, and the facility layout are presented. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Power, JG (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1813 EP 1815 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600559 ER PT B AU Trbojevic, D Berg, JS Blaskiewicz, M Courant, ED Palmer, R Garren, A AF Trbojevic, D Berg, JS Blaskiewicz, M Courant, ED Palmer, R Garren, A BE Chew, J Lucas, P Webber, S TI FFAG lattice for muon acceleration with distributed RF SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A future muon collider or neutrino factory requires fast acceleration to minimize muon decay. We have previously described an FFAG ring that accelerated muons from 10 to 20 GeV in energy. The ring achieved its large momentum acceptance using a low-emittance lattice with a small dispersion. In this paper, we present an update on that ring. We have used design tools that more accurately represent the ring's behavior at large momentum offsets. We have also improved the dynamic aperture from the earlier design. C1 BNL, Upton, NY USA. RP Trbojevic, D (reprint author), BNL, Upton, NY USA. RI Berg, Joseph/E-8371-2014 OI Berg, Joseph/0000-0002-5955-6973 NR 7 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1816 EP 1818 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600560 ER PT B AU Wang, XJ Sheehy, B Wu, Z Gai, W Ting, A AF Wang, XJ Sheehy, B Wu, Z Gai, W Ting, A BE Chew, J Lucas, P Webber, S TI Proposal for a pre-bunched Laser Wakefield acceleration experiment at the BNL DUV-FEL facility SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We propose a pre-bunched Laser Wakefield Acceleration (LWFA) experiment in a plasma channel at the BNL DUV-FEL Facility. BNL DUV-FEL facility is uniquely qualified to carry out the proposed experiment because of the high-brightness electron beam and RF synchronized TW Ti:Sapphire laser system. The DUV-FEL is a 200 MeV linac facility equipped with a photocathode RF gun injector, a 100 fs Ti:Sapphire laser system and a magnetic bunch compressor. The proposed LWFA will inject a 150 MeV, 10 fs electron bunch into a centimeters long plasma channel. Simulation and preliminary experiment showed that, high-brightness 10 fs electron bunch with 20 pC charge could be produced using the technique of longitudinal emittance compensation. The initial experiment will be performed using the existing Ti:Sapphire laser system (50mJ, 100 fs) with 30 mum spot and 4 cm channel, the maximum energy gain will be about 15 MeV. We propose to upgrade the existing SDL laser output to 500 mJ with a shorter pulse length (50 fs). For an electron beam spot size of 20 um, the expected energy gain is about 100 MeV for a 5 TW, 50 fs laser pulse. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. RP Wang, XJ (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1819 EP 1821 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600561 ER PT B AU Green, MA Black, EL Cummings, MA Kaplan, DM Ishimoto, S Cobb, JH Lau, W Yang, S Palmer, RB AF Green, MA Black, EL Cummings, MA Kaplan, DM Ishimoto, S Cobb, JH Lau, W Yang, S Palmer, RB BE Chew, J Lucas, P Webber, S TI The integration of liquid and solid muon absorbers into a focusing magnet of a muon cooling channel SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB This report describes how one can integrate the muon absorber with the focusing coils of a SFOFO muon cooling channel [1]. The absorber material must be a low Z material that reduces the muon momentum with minimum scattering. The best materials to use for muon ionization cooling absorbers are hydrogen, helium, lithium hydride, lithium, and beryllium. Hydrogen or helium in an absorber would normally be in the liquid state. Lithium hydride, lithium, and beryllium would normally be in the solid state. This report limits the absorber materials discussed to hydrogen, helium, lithium, and beryllium. In order to achieve the same level of ionization cooling with a solid absorber as a liquid hydrogen absorber, the beta of the muon beam must be reduced more than a factor of two. This affects both the designs of the absorber and the magnet around it. Reducing the beam beta reduces the momentum acceptance of the channel. Integration of a liquid hydrogen absorber and solid absorbers with a superconducting focusing solenoid is discussed. The choice of absorber material affects the design of the superconducting focusing magnet and the superconductor that is used to generate the magnetic field. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Green, MA (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1834 EP 1836 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600566 ER PT B AU Nishimura, H Lambertson, G Kalnins, JG Gould, H AF Nishimura, H Lambertson, G Kalnins, JG Gould, H BE Chew, J Lucas, P Webber, S TI Latticies for milli-eV neutral molecules SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB An electric dipole moment of neutral polar molecules interacts with non-uniform electric field; therefore it is possible to design electrodes that replace magnets for charged particles and a lattice that is a series of electrodes to circulate such molecules. We describe our recent result of designing a ring for CH3F in comparison with our previous design for ND3. C1 LBNL, Berkeley, CA 94720 USA. RP Nishimura, H (reprint author), LBNL, Berkeley, CA 94720 USA. NR 2 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1837 EP 1839 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600567 ER PT B AU Toth, C Faure, J Geddes, CGR van Tilborg, J Leemans, WP AF Toth, C Faure, J Geddes, CGR van Tilborg, J Leemans, WP CA L'OASIS Grp BE Chew, J Lucas, P Webber, S TI Shaping of pulses in optical grating-based laser systems for optimal control of electrons in laser plasma wake-field accelerator SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID PHASE-CONTROL; AMPLIFICATION; AMPLITUDE AB In typical chirped pulse amplification (CPA) laser systems, scanning the grating separation in the optical compressor causes the well know generation of linear chirp of frequency vs. time in a laser pulse, as well as a modification of all the higher order phase terms. By setting the compressor angle slightly different from the optimum value to generate the shortest pulse, a typical scan around this value will produce significant changes to the pulse shape. Such pulse shape changes can lead to significant differences in the interaction with plasmas such as used in laser wake-field accelerators. Strong electron yield dependence on laser pulse shape in laser plasma wake-field electron acceleration experiments have been observed in the L'OASIS Lab of LBNL [1]. These experiments show the importance of pulse skewness parameter, S, defined here on the basis of the ratio of the 'head-width-half-max' (HWHM) and the 'tail-width-half-max' (TWHM), respectively. C1 Lawrence Berkeley Natl Lab, LOASIS Grp, Div Accelerator & Fus Res, Berkeley, CA 94720 USA. RP Toth, C (reprint author), Lawrence Berkeley Natl Lab, LOASIS Grp, Div Accelerator & Fus Res, BLDG 71R0259,1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1840 EP 1842 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600568 ER PT B AU Xie, M AF Xie, M BE Chew, J Lucas, P Webber, S TI A fundamental theorem on particle acceleration SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A fundamental theorem on particle acceleration is derived from the reciprocity principle of electromagnetism and a rigorous proof of the theorem is presented. The theorem establishes a relation between acceleration and radiation, which is particularly useful for insightful understanding of and practical calculation about the first order acceleration in which energy gain of the accelerated particle is linearly proportional to the accelerating field. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Xie, M (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. NR 5 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1843 EP 1845 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600569 ER PT B AU Cowan, B Javanmard, M Siemann, R AF Cowan, B Javanmard, M Siemann, R BE Chew, J Lucas, P Webber, S TI Photonic crystal laser accelerator structures SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Photonic crystals have great potential for use as laser-driven accelerator structures. A photonic crystal is a dielectric structure arranged in a periodic geometry. Like a crystalline solid with its electronic band structure, the modes of a photonic crystal lie in a set of allowed photonic bands. Similarly, it is possible for a photonic crystal to exhibit one or more photonic band gaps, with frequencies in the gap unable to propagate in the crystal. Thus photonic crystals can confine an optical mode in an all-dielectric structure, eliminating the need for metals and their characteristic losses at optical frequencies. We discuss several geometries of photonic crystal accelerator structures. Photonic crystal fibers (PCFs) are optical fibers which can confine a speed-of-light optical mode in vacuum. Planar structures, both two-and three-dimensional, can also confine such a mode, and have the additional advantage that they can be manufactured using common microfabrication techniques such as those used for integrated circuits. This allows for a variety of possible materials, so that dielectrics with desirable optical and radiation-hardness properties can be chosen. We discuss examples of simulated photonic crystal structures to demonstrate the scaling laws and trade-offs involved, and touch on potential fabrication processes. C1 SLAC, Stanford, CA 94309 USA. RP Cowan, B (reprint author), SLAC, Stanford, CA 94309 USA. EM benc@slac.stanford.edu NR 13 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1855 EP 1857 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600573 ER PT B AU Noble, RJ Colby, ER Palmer, DT Siemann, RH Walz, D Byer, R Joshi, C Mori, W Rosenzweig, J Katsouleas, T AF Noble, RJ Colby, ER Palmer, DT Siemann, RH Walz, D Byer, R Joshi, C Mori, W Rosenzweig, J Katsouleas, T BE Chew, J Lucas, P Webber, S TI The ORION facility SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB ORION will be a user-oriented research facility for understanding the physics and developing the technology for future high-energy particle accelerators, as well as for research in related fields. The facility has as its centerpiece the Next Linear Collider Test Accelerator (NLCTA) at the Stanford Linear Accelerator Center (SLAC). The NLCTA will be modified with the addition of a new, high-brightness photoinjector, its drive laser, an S-band rf power system, a user laser room, a low-energy experimental hall supplied with electron beams up to 60 MeV in energy, and a high-energy hall supplied with beams up to 350 MeV. The facility design and parameters are described here along with highlights from the 2(nd) ORION Workshop held in February 2003. C1 SLAC, Stanford, CA USA. RP Noble, RJ (reprint author), SLAC, Stanford, CA USA. NR 4 TC 2 Z9 2 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1858 EP 1860 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600574 ER PT B AU Gupta, R Luccio, A Morgan, G Mackay, W Power, K Roser, T Willen, E Okamura, M AF Gupta, R Luccio, A Morgan, G Mackay, W Power, K Roser, T Willen, E Okamura, M BE Chew, J Lucas, P Webber, S TI Magnetic design of a superconducting AGS Snake SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Brookhaven National Laboratory plans to build a partial helical snake for polarized proton acceleration in the AGS. It will be a 3 Tesla superconducting magnet having a magnetic length of 1.9 meter. AGS needs only one magnet and currently there is no plan to build a prototype. Therefore, the first magnet itself must function at the design operating field and provide the required field quality, spin rotation and deflections on the particle beam. New software have been developed that exchanges input/output between the OPERA3d field design program, the Pro-Engineering CAD model and the software that drives the machine to make slots in aluminum cylinders where blocks of 6-around-1 NbTi wires are placed. This new software have been used to carry out a number of iterations to satisfy various design requirements and to assure that the profile that is used in making field computations is the same that is used in cutting metal. The optimized coil cross-section is based on a two layer design with both inner and outer layers having five current blocks per quadrant. The ends are based on a design concept that will be used for the first time in accelerator magnets. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Gupta, R (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1936 EP 1938 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600600 ER PT B AU Anerella, M Gupta, R Kovach, P Marone, A Plate, S Power, K Schmalzle, J Willen, E AF Anerella, M Gupta, R Kovach, P Marone, A Plate, S Power, K Schmalzle, J Willen, E BE Chew, J Lucas, P Webber, S TI Engineering of the AGS Snake coil assembly SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A 30% Snake superconducting magnet is proposed to maintain polarization in the AGS proton beam, the magnetic design of which is described elsewhere [1]. The required helical coils for this magnet push the limits of the technology developed for the RHIC Snake coils. First, fields must be provided with differing pitch along the length of the magnet. To accomplish this, a new 3-D CAD system ("Pro/Engineer" from PTC), which uses parametric techniques to enable fast iterations, has been employed. Revised magnetic field calculations are then based on the output of the mechanical model. Changes are made in turn to the model on the basis of those field calculations. To ensure that accuracy is maintained, the final solid model is imported directly into the CNC machine programming software, rather than by the use of graphics translating software. Next, due to the large coil size and magnetic field, there was concern whether the structure could contain the coil forces. A finite element analysis was performed, using the 3-D model, to ensure that the stresses and deflections were acceptable. Finally, a method was developed using ultrasonic energy to improve conductor placement during coil winding, in an effort to minimize electrical shorts due to conductor misplacement, a problem that occurred in the RHIC helical coil program. Each of these activities represents a significant improvement in technology over that which was used previously for the RHIC snake coils. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Anerella, M (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1939 EP 1941 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600601 ER PT B AU Kashikhin, VS Ambrosio, G Andreev, N Bhashyam, S Kashikhin, V Peterson, T Tompkins, J Zlobin, AV Jason, A Kelley, JP Walstrom, P AF Kashikhin, VS Ambrosio, G Andreev, N Bhashyam, S Kashikhin, V Peterson, T Tompkins, J Zlobin, AV Jason, A Kelley, JP Walstrom, P BE Chew, J Lucas, P Webber, S TI Conceptual design of large-bore superconducting quadrupoles with active magnetic shielding for the AHF SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Advanced Hydrotest Facility, under study by LANL, uses large-bore superconducting quadrupole magnets. In the paper we discuss the conceptual design of such quadrupoles using active shielding. The magnets are specified to achieve gradients of up to 24 T/m with a 28cm warm bore and to have 0.01% field quality. Concepts for quench protection and the magnet cryosystems are also briefly discussed to confirm the viability of the proposed design. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Kashikhin, VS (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. OI Bhashyam, Srikrishna/0000-0001-9953-0914 NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1966 EP 1968 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600610 ER PT B AU Velev, GV Bossert, R Carcagno, R Carson, J Chichili, D DiMarco, J Feher, S Glass, H Kashikhin, VV Kerby, J Lamm, M Nicol, T Nobrega, A Orris, D Page, T Peterson, T Rabehl, R Schlabach, P Strait, J Sylvester, C Tartaglia, M Tompkins, JC Yadav, S Zlobin, AV AF Velev, GV Bossert, R Carcagno, R Carson, J Chichili, D DiMarco, J Feher, S Glass, H Kashikhin, VV Kerby, J Lamm, M Nicol, T Nobrega, A Orris, D Page, T Peterson, T Rabehl, R Schlabach, P Strait, J Sylvester, C Tartaglia, M Tompkins, JC Yadav, S Zlobin, AV BE Chew, J Lucas, P Webber, S TI Field quality of the LHC inner triplet quadrupoles being fabricated at Fermilab SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Fermilab, as part of the US-LHC Accelerator Project, has designed and is producing superconducting low-beta quadrupole magnets for the Large Hadron Collider (LHC). These 70 mm bore, 5.5 m long magnets operate in superfluid helium at 1.9 K with a maximum operating gradient of 214 T/m. Two quadrupoles, combined with a dipole orbit corrector, form a single LQXB cryogenic assembly, the Q2 optical element of the final focus triplets in the LHC interaction regions. Field quality was measured at room temperature during fabrication of the cold masses as well as at superfluid helium temperature in two thermal cycles for the first LQXB cryogenic assembly. Integral cold measurements were made with a 7.1 m long rotating coil and with a 0.8 m long rotating coil at 8 axial positions and in a range of currents. In addition to the magnetic measurements, this paper reports on the quench performance of the cold masses and on the measurements of their internal alignment. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Velev, GV (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1969 EP 1971 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600611 ER PT B AU Velev, GV Annala, G Bauer, P Carcagno, R DiMarco, J Glass, H Hanft, R Kephart, R Lamm, M Martens, M Schlabach, P Tartaglia, M Tompkins, J AF Velev, GV Annala, G Bauer, P Carcagno, R DiMarco, J Glass, H Hanft, R Kephart, R Lamm, M Martens, M Schlabach, P Tartaglia, M Tompkins, J BE Chew, J Lucas, P Webber, S TI Measurements of field decay and snapback effect on Tevatron dipole magnets SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The performance of Fermilab's Tevatron accelerator, currently in its Run II stage, is degraded by beam loss and emittance dilution during ramping from injection to collision energy. This could be related in part to insufficient compensation of dynamic effects such as the decay of the magnetic field in the dipoles during the dwell at injection and the following so-called snapback during the first few seconds of the energy ramp. The two effects are closely related and depend on the powering history of the magnets. Dynamic effects, which were originally discovered at the Tevatron [1], were investigated on Tevatron magnets in various past measurement campaigns in the 1980s and later in 1996 [2]. This paper reports on the most recent measurements performed on an additional set of Tevatron magnets. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Velev, GV (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1972 EP 1974 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600612 ER PT B AU Zlobin, AV Kashikhin, VV Strait, JB AF Zlobin, AV Kashikhin, VV Strait, JB BE Chew, J Lucas, P Webber, S TI Aperture limitations for 2(nd) generation Nb3Sn LHC IR quadrupoles' SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB One of the straightforward ways towards the higher luminosity in the LHC is a replacement of the present 70-mm NbTi quadrupoles with Nb3Sn quadrupoles which would provide the same field gradient but in a larger aperture. Conceptual designs of such magnets with 90 mm aperture have been developed and studied. This paper discusses the possibilities and limitations of further increasing the aperture of Nb3Sn low-beta quadrupoles, and shows that an aperture up to 110 mm is possible. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Zlobin, AV (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1975 EP 1977 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600613 ER PT B AU Ferracin, P Caspi, S Chiesa, L Dietderich, DR Gourlay, SA Hafalia, RR Lietzke, AF McInturff, AD Sabbi, G Scanlan, RM AF Ferracin, P Caspi, S Chiesa, L Dietderich, DR Gourlay, SA Hafalia, RR Lietzke, AF McInturff, AD Sabbi, G Scanlan, RM BE Chew, J Lucas, P Webber, S TI Field quality analysis of the next generation IR quadrupole for the LHC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID SUPERCONDUCTING MAGNETS AB Lawrence Berkeley National Laboratory (LBNL) is carrying out a conceptual design study of a Nb3Sn quadrupole for the next generation LHC Interaction Region (IR). The choice of a gradient of 205 T/m and an increased bore size of 90 mm represents a promising strategy towards increasing the luminosity up to an ultimate goal of 2.3x10(34) CM(-2)s(-1). At the present time Nb3Sn is the only conductor with sufficient current density for this application. Coil designs with either two or four layers are being considered. Previous studies have examined cable and coil parameters, systematic harmonics, support structure and quench protection system. In this paper the issue of field quality is further discussed. C1 LBNL, Berkeley, CA 94720 USA. RP Ferracin, P (reprint author), LBNL, Berkeley, CA 94720 USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1984 EP 1986 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600616 ER PT B AU Green, MA Barr, G Baynham, DE Rockford, JH Fabbricatore, P Farinon, S Palmer, RB Rey, JM AF Green, MA Barr, G Baynham, DE Rockford, JH Fabbricatore, P Farinon, S Palmer, RB Rey, JM BE Chew, J Lucas, P Webber, S TI Superconducting solenoids for the MICE channel SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB This report describes the channel of superconducting solenoids for the proposed international Muon Ionization Cooling Experiment (MICE). MICE consists of two cells of a SFOFO cooling channel that is similar to that studied in the level 2 study of a neutrino factory[l]. MICE also consists of two detector solenoids at either end of the cooling channel section. The superconducting solenoids for MICE perform three functions. The coupling solenoids, which are large solenoids around 201.25 MHz RF cavities, couple the muon beam between the focusing sections as it passes along the cooling channel. The focusing solenoids are around the liquid hydrogen absorber that reduces the momentum of the muons in all directions. These solenoids generate a gradient field along the axis as they reduce the beta of the muon beam before it enters the absorber. Each detector solenoid system consists of five coils that match the muon beam coming to or from an absorber to a 4.0 T uniform solenoidal field section that that contains the particle detectors at the ends of the experiment. There are detector solenoids at the beginning and at the end of the experiment. This report describes the parameters of the eighteen superconducting coils that make up the MICE magnetic channel. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Green, MA (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1987 EP 1989 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600617 ER PT B AU Sabbi, G Faltens, A Leitner, M Lietzke, A Seidl, P Barnard, J Lund, S Martovetsky, N Gung, C Minervini, J Radovinsky, A Schultz, J Meinke, R AF Sabbi, G Faltens, A Leitner, M Lietzke, A Seidl, P Barnard, J Lund, S Martovetsky, N Gung, C Minervini, J Radovinsky, A Schultz, J Meinke, R BE Chew, J Lucas, P Webber, S TI Superconducting focusing quadrupoles for heavy ion fusion experiments SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Heavy Ion Fusion (HIF) Program is developing superconducting focusing magnets for both near-term experiments and future driver accelerators. In particular, single bore quadrupoles have been fabricated and tested for use in the High Current Experiment (HCX) at Lawrence Berkeley National Laboratory (LBNL). The next steps involve the development of magnets for the planned Integrated Beam Experiment (IBX) and the fabrication of the first prototype multi-beam focusing arrays for fusion driver accelerators. The status of the magnet R&D program is reported, including experimental requirements, design issues and test results. C1 LBNL, Berkeley, CA USA. RP Sabbi, G (reprint author), LBNL, Berkeley, CA USA. NR 15 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1990 EP 1992 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600618 ER PT B AU Norem, J Black, E Bandura, L Cummings, MAC Errede, D AF Norem, J Black, E Bandura, L Cummings, MAC Errede, D BE Chew, J Lucas, P Webber, S TI Measurement of beam driven hydrodynamic turbulence SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Cooling intense muon beams in liquid hydrogen absorbers introduces kW of heating to the cold fluid, which will drive turbulent flow[l]. The amount of turbulence may be sufficient to help cool the liquid, but calculations are difficult. We have used a 20 MeV electron beam in a water tank to look at the scale of the beam driven convection and turbulence. The density and flow measurements are made with schlieren and Ronchi systems. We describe the optical systems and the turbulence measured. These data are being used to calibrate hydrodynamic calculations of convection driven and forced flow cooling in muon cooling absorbers. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Norem, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 2 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 1999 EP 2001 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600621 ER PT B AU Fernow, RC Berg, JS Gallardo, JC Palmer, RB AF Fernow, RC Berg, JS Gallardo, JC Palmer, RB BE Chew, J Lucas, P Webber, S TI Muon cooling in the RFOFO ring cooler SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The performance of the ring described here compares favorably with the linear cooling channel used in the second U.S. Neutrino Factory Study[l]. The 6D phase space density of an idealized ring is increased by a factor of 238, compared with the linear channel's factor of only 15. The simulations make use of fully realistic magnetic fields, and include absorber and rf cavity windows, and empty lattice cells for injection/extraction. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Gallardo, JC (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. RI Berg, Joseph/E-8371-2014; OI Berg, Joseph/0000-0002-5955-6973; Gallardo, Juan C/0000-0002-5191-3067 NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2002 EP 2004 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600622 ER PT B AU Kewisch, J Chang, XY Wang, D Montag, C Ben-Zvi, I AF Kewisch, J Chang, XY Wang, D Montag, C Ben-Zvi, I BE Chew, J Lucas, P Webber, S TI Layout and optics for the RHIC electron cooler SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB As part of a luminosity upgrade it is planned to add an electron cooling section to the RHIC accelerator. Existing electron coolers operate at low beam energies and use a continuous electron stream. The ion energy of 100 GeV/u in RHIC requires an electron energy of 55 MeV. Therefore the RHIC cooler uses a linac with energy recovery for the electron acceleration. Short bunches exiting the linac section are stretched longitudinally to reduce the momentum spread and space charge effects in the cooling section, and compressed afterwards for deceleration and energy recovery in the linac. This report describes the design of the electron beam transport and simulation results. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kewisch, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2005 EP 2007 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600623 ER PT B AU Kirk, H Cline, D Fukui, Y Garren, A AF Kirk, H Cline, D Fukui, Y Garren, A BE Chew, J Lucas, P Webber, S TI Muon storage rings for 6D phase-space cooling SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We describe several storage ring designs for reducing the 6-dimensional phase space of circulating muon beams. These rings utilize quadrupole and dipole magnets as well as wedge-shaped, liquid-hydrogen, energy-loss absorbers and energy compensating rf cavities. We obtain evaluations of their cooling performance by particle tracking simulation. Such rings are potentially useful for future Neutrino Factories or Muon Colliders as well as for existing facilities in which cooled, intense muon beams could enhance their physics programs. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kirk, H (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 10 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2008 EP 2010 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600624 ER PT B AU Montag, C Kewisch, J AF Montag, C Kewisch, J BE Chew, J Lucas, P Webber, S TI Effect of solenoid field errors on electron beam temperatures in the RHIC electron cooler SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB As part of a future upgrade to the Relativistic Heavy Ion Collider (RHIC), electron cooling is foreseen to decrease ion beam emittances. Within the electron cooling section, the "hot" ion beam is immersed in a "cold" electron beam. The cooling effect is further enhanced by a solenoid field in the cooling section, which forces the electrons to spiral around the field lines with a (Larmor) radius of 10 micrometers, reducing the effective transverse temperature by orders of magnitude. Studies of the effect of solenoid field errors on electron beam temperatures are reported. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Montag, C (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2011 EP 2013 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600625 ER PT B AU Balbekov, V AF Balbekov, V BE Chew, J Lucas, P Webber, S TI Lithium lenses based muon cooling channel SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A linear ionization cooling channel for neutrino factory or muon collider is considered. It includes short Li lenses, matching solenoids, and 201 MHz RF cavities. The basic challenge is a suppression of chromatic effects in a wide energy range typical for muon beams. A special lattice is proposed to reach this, and methodic of an optimization is developed to minimize the chromatic aberrations by suppression of several betatron resonances. The most engineering constraint is a high field of matching solenoids. A channel with less of 10 T field is considered in detail. It is capable to cool transverse emittance of a beam from 23 mm to 0.5 mm at the channel length of about 130 m. Because there is no emittance exchange, longitudinal emittance increases in the process from 10 to 20 mm at transmission of about 90%. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Balbekov, V (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2014 EP 2016 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600626 ER PT B AU Balbekov, V AF Balbekov, V BE Chew, J Lucas, P Webber, S TI Investigation and simulation of muon cooling ring with tilted solenoids SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Alternating solenoid focused muon cooling ring without special bending magnets is considered and investigate in detail. Both fringe field between solenoid coils with opposite directed current, and an inclination of the coils in vertical plane are used to provide a bending and closing of the particle trajectories. Realistic (Maxwellian) magnetic field is calculated and used for a simulation. Methodic is developed and applied to find closed orbit at any energy, dispersion, region of stability, and other conventional accelerator characteristics. Earlier proposed RFOFO cooling ring with 200 MHz RF system and liquid hydrogen absorbers is investigated in detail. After an optimization, normalized 6D emittance about 20 mm(3) and transmission 57% are obtained. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Balbekov, V (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2017 EP 2019 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600627 ER PT B AU Ladran, A Li, D Moretti, A Rimmer, R Staples, J Virostek, S Zisman, M AF Ladran, A Li, D Moretti, A Rimmer, R Staples, J Virostek, S Zisman, M BE Chew, J Lucas, P Webber, S TI Analysis of a grid window structure for RF cavities in a muon cooling channel SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We report on the electromagnetic and thermal analysis of a grid window structure for high gradient, low frequency RF cavities. Windows may be utilized to close the beam iris and increase shunt impedance of closed-cell RF cavities. This work complements previous work presented for windows made of solid beryllium foil. An electromagnetic and thermal analysis of the thin wall tubes in a grid pattern was conducted using both MAFIA4 and ANSYS finite element analyses. The results from both codes agreed well for a variety of grid configurations and spacing. The grid configuration where the crossing tubes touched was found to have acceptable E-Fields and H-Fields performance. The thermal profiles for the grid will also be shown to determine a viable cooling profile. C1 LBNL, Berkeley, CA USA. RP Ladran, A (reprint author), LBNL, Berkeley, CA USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2023 EP 2025 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600629 ER PT B AU Berg, S Barsz, T Briddick, D Givens, M Goeppner, G Grelick, AE Jansma, W Lewellen, J Lopez, A Martens, M Michalek, W Wesling, S AF Berg, S Barsz, T Briddick, D Givens, M Goeppner, G Grelick, AE Jansma, W Lewellen, J Lopez, A Martens, M Michalek, W Wesling, S BE Chew, J Lucas, P Webber, S TI The advanced photon source injector test stand: Phase two SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The high-power S-band feed subsystem and the versatile method of beamline construction have been combined to provide for further testing of a unique gun that incorporates three cavities and requires three separate S-band feeds. Completed in December 2002, this configuration of the injector test stand is intended to investigate performance of the ballistic bunch compression gun [I]. If this gun proves to be desirable for injection at the APS, then the ballistic bunch compression gun together with the S-band feed subsystem and portions of the beamline will be relocated in the APS linac tunnel. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Berg, S (reprint author), Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2029 EP 2031 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600631 ER PT B AU Conde, ME Gai, W Jing, C Konecny, R Liu, W Power, JG Wang, H Yusof, Z AF Conde, ME Gai, W Jing, C Konecny, R Liu, W Power, JG Wang, H Yusof, Z BE Chew, J Lucas, P Webber, S TI A new high intensity electron beam for wakefield acceleration studies SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A new RF photocathode electron gun and beamline have been built for the study of electron beam driven wakefield acceleration. The one and a half cell L-band gun operates with an electric field on the cathode surface of 80 MV/m, and generates electron bunches with tens of nanocoulombs of charge and rms bunch lengths of a few picoseconds. The beam diagnostics include a Cherenkov radiator and streak-camera for bunch length measurements, YAG screens for beam profile, integrating charge transformers (ICTs) for bunch charge, an energy spectrometer, and a pepper-pot plate for measurement of the transverse emittance. Measurements of the beam properties at various bunch charges are presented. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Conde, ME (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 8 TC 5 Z9 6 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2032 EP 2034 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600632 ER PT B AU Lewellen, JW AF Lewellen, JW BE Chew, J Lucas, P Webber, S TI Energy-spread compensation of a thermionic-cathode RF gun SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Advanced Photon Source (APS) ballistic bunch compression (BBC) gun was designed as a prototype injector to explore the technique of drift-space compression of a high-brightness beam [1]. It is constructed from three independently powered S-band rf cells, one cathode half-cell, and two full cells, and is designed to operate with both thermionic cathodes and photocathodes; this flexibility allows the gun to be operated in modes other than for ballistic compression. In particular, appropriate choices of rf power and phase can be used to reduce the energy spread of the beam produced by the gun. With a thermionic cathode, simulations indicate that a 1% FWFM energy spread can contain at least 90% of the emitted beam charge. This operating mode demonstrates many of the capabilities required for ballistic bunch compression, but allows verification of the basic gun performance via a much easier measurement. Also, such a beam is of interest as a source for other experiments, e.g., low-cost, compact, free-electron lasers. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Lewellen, JW (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 6 TC 2 Z9 3 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2035 EP 2037 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600633 ER PT B AU Lewellen, J Beczek, K Berg, S Briddick, DA Dortwegt, R Givens, M Grelick, A Nassiri, A Pasky, S Smith, TL AF Lewellen, J Beczek, K Berg, S Briddick, DA Dortwegt, R Givens, M Grelick, A Nassiri, A Pasky, S Smith, TL BE Chew, J Lucas, P Webber, S TI A flexible injector test stand design SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Advanced Photon Source (APS) has constructed an injector test stand (ITS) for high-brightness electron beam research. The test stand includes three rf ports with independent phase and power control, beamline supports designed for rapid reconfiguration, and a control and diagnostics system based on the design of the APS linac. The beamline design features a high-resolution electron spectrometer that includes provision for operation as a dispersion-free dogleg, and a rapidly reconfigurable gun-to-spectrometer transport line. Picosecond and nanosecond photocathode drive lasers are available; the room shielding is also adequate for the high average beam powers typically produced by thermionic-cathode rf guns. The initially installed gun is a ballistic-compression gun, which requires all three rf ports to be connected to the gun. Plans include the installation of a higher-order mode photoinjector, requiring one rf connection; this will free the other ports to provide power to a small TW linac section and deflector cavity for bunch-length measurements. The test stand is also capable of being used as an operator training facility, and serves as a validation facility and test bed for the APS main injector rf guns. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Lewellen, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2038 EP 2040 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600634 ER PT B AU Zhao, Q Cole, M AF Zhao, Q Cole, M BE Chew, J Lucas, P Webber, S TI Tests of niobium cathode for the superconducting radio frequency gun SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB For the superconducting all-niobium photocathode radio frequency gun project, we have studied the surface preparation techniques of the niobium cathode material. The quantum efficiency (QE) of high purity niobium (RRR=250) has been intensively measured at room temperature on a dedicated DC system. After buffer chemical polishing or electrolytic polishing, the initial QE is in the order of 10(-7) range tested by a 266 nm picosecond laser beam. However, the QE could be improved by more than two orders of magnitude after appropriate in situ laser cleaning. Both 266nm ps-YAG and 248nm ns-excimer laser beams have been used in the process of cleaning. The thresholds of the laser cleaning intensity were also experimentally determined to keep the morphology of the superconducting cavity surface. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Zhao, Q (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 5 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2047 EP 2049 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600637 ER PT B AU Zhao, YX Cole, MD AF Zhao, YX Cole, MD BE Chew, J Lucas, P Webber, S TI The analysis of the cross-talk in a RF gun superconducting cavity SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A project to develop an all Niobium Superconducting RF Gun is underway at Brookhaven National Laboratory in collaboration with Advanced Energy Systems. The geometry of the gun requires that the power input and the pickup probes are on the same side of the cavity, which causes direct coupling between them, or crosstalk. At room temperature, the crosstalk causes serious distortion of the RF response. This paper addresses the phenomenon, the analysis and the simulation results as well as the measurements. A method is provided on how to extract the desired information from the confusing signal and allow accurate measurements of the coupling between the probes and the cavity. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Zhao, YX (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2050 EP 2052 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600638 ER PT B AU Huning, M Schlarb, H AF Huning, M Schlarb, H BE Chew, J Lucas, P Webber, S TI Measurement of the beam energy spread in the TTF photo-injector SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB At the TESLA Test Facility (TT F) linac the required high peak current for FEL operation is achieved by compressing the beam longitudinally in a magnetic chicane. The peak current after the chicane is determined by the residual energy spread of the electron bunch which is produced by an rf photo-injector. By residual energy spread we refer to the energy spread of a temporal slice of the bunch which can not be compensated by any time dependent energy modulation. To determine the energy distribution, an improved optical system has been implemented to image the beam at an OTR-station after a spectrometer dipole. In this paper the results of the beam profile measurements are presented and compared to particle tracking simulations. It is shown that the residual energy spread in the injector on in order of a few keV only, even at bunch charges of 4 nC. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Huning, M (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 6 TC 7 Z9 7 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2074 EP 2076 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600646 ER PT B AU Liu, JF Krawczyk, FL Kurennoy, SS Schrage, DL Shapiro, AH Tajima, T Wood, RL AF Liu, JF Krawczyk, FL Kurennoy, SS Schrage, DL Shapiro, AH Tajima, T Wood, RL BE Chew, J Lucas, P Webber, S TI RF surface resistance of copper-on-beryllium at cryogenic temperatures measured by a 22-GHz demountable cavity SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A 22-GHz demountable cavity on the cold head of a compact refrigerator system was used to measure the RF performance of several copper-plated Beryllium samples. The cavity inner surface was treated by chemical polishing and heat treatment, as well as an OFE copper coupon to provide a baseline for comparison. The measured surface resistance was reasonable and repeatable during either cooling or warming. Materials tested included four grades of Beryllium, OFE copper, alumina-dispersion strengthened copper (Glideop(R)), and Cu-plated versions of all of the above. Two coupons, Cu-plated on Beryllium O-30 and I-70, offered comparable surface resistance to pure OFE copper or Cu-plated Glidcop. The RF surface resistance of Cu-on-Beryllium samples at cryogenic temperatures is reported together with that of other reference materials. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Liu, JF (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 4 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2083 EP 2085 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600649 ER PT B AU Lidia, S Corlett, J Pusina, J Staples, J Zholents, A AF Lidia, S Corlett, J Pusina, J Staples, J Zholents, A BE Chew, J Lucas, P Webber, S TI An injector for the proposed Berkeley ultrafast x-ray light source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Berkeley Lab has proposed to build a recirculating linac based x-ray source for ultra-fast dynamic studies [I]. This machine requires a flat electron beam with a small vertical emittance and large x/y emittance ratio to allow for compression of spontaneous undulator emission of soft and hard x-ray pulses, and a low-emittance, round electron beam for coherent emission of soft x-rays via the FEL process based on cascaded harmonic generation [2]. We propose an injector system consisting of two high gradient high repetition rate photocathode guns [3] (one for each application), a similar to120 MeV superconducting linear accelerator, a 3(rd) harmonic cavity for linearization of the longitudinal phase space, and a bunch compressor. We present details of the design and the results of particle tracking studies using several computer codes. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Lidia, S (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2086 EP 2088 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600650 ER PT B AU Lidia, S AF Lidia, S BE Chew, J Lucas, P Webber, S TI Emittance compensation studies of photoinjector beams with angular momentum SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Beam dynamics studies on the FNPL photoinjector that seek to optimize the transport of intense electron beams with large values of canonical angular momentum have been performed. These studies investigate the effect of solenoid emittance compensation on beams that evolve under the combined influence of intense space charge forces and large angular momentum. We present details of experimental measurements and supporting simulations of beam envelope evolution. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Lidia, S (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2089 EP 2091 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600651 ER PT B AU Staples, JW Lidia, SM Virostek, SP Rimmer, R AF Staples, JW Lidia, SM Virostek, SP Rimmer, R BE Chew, J Lucas, P Webber, S TI The LBNL femtosource (LUX) 10 KHz photoinjector SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The LBNL femtosecond-level X-ray source, now christened LUX, a source of hard X-rays with a pulse length in the 50-200 fsec range, will operate at a pulse rate of up to 10 kHz. The room-temperature 1.3 GHz photoinjector includes a modified re-entrant first-cell cavity which min-imizes peak surface field, the addition of a third pi-mode acceleration cell, waveguide r.f. feeds to each cell, and an active energy removal procedure which reduces the wall power density of all four cells. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Staples, JW (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2092 EP 2094 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600652 ER PT B AU Bames, CD Colby, ER Sears, CM AF Bames, CD Colby, ER Sears, CM BE Chew, J Lucas, P Webber, S TI An electron source for a laser accelerator SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Laser accelerators offer the promise of producing attosecond electron bunches from a compact accelerator. Electron source requirements for laser accelerators are challenging in several respects, but are achievable. We discuss these requirements, and propose an injector design. Simulation and design work for essential components for a laser accelerator electron source suitable for a high energy physics machine will be presented. Near-term plans to test key technical components of the laser injector will also be discussed. C1 SLAC, Menlo Pk, CA 94025 USA. RP Colby, ER (reprint author), SLAC, 2575 Sand Hill Rd,Mail Stop 07, Menlo Pk, CA 94025 USA. EM ecolby@slac.stanford.edu NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2101 EP 2103 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600655 ER PT B AU Dowell, DH Bolton, PR Clendenin, JE Gierman, SM Limborg, CG Murphy, BF Schmerge, JF AF Dowell, DH Bolton, PR Clendenin, JE Gierman, SM Limborg, CG Murphy, BF Schmerge, JF BE Chew, J Lucas, P Webber, S TI Analysis of slice emittance measurements for the SLAC gun test facility SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Linac Coherent Light Source (LCLS) at SLAC requires the rf photo-injector to produce a beam with a normalized, projected emittance of 1 micron in a 10 ps long bunch with a charge of 1nC. In addition, a small longitudinal emittance is needed to attain the desired 3 kiloamperes peak current after compression in two chicane bunchers. To achieve this excellent beam quality, we are performing systematic studies of both the transverse and longitudinal beam properties from the rf photocathode gun at the SLAC Gun Test Facility (GTF). Time resolved emittances (slice) are determined by using a bunch with a linear energy chirp which is dispersed by a magnetic spectrometer. By varying the strength of a quadrupole lens upstream of the spectrometer allows measurement of the individual slice emittances. Spectrometer images at the various quadrupole settings are binned in small energy/time windows and analyzed for the slice parameters. Our measurements indicate a temporal resolution of approximately 100 femtoseconds. In addition, the longitudinal phase space distribution is determined by measuring the energy spectrum over a range of linac phases. The correlated and uncorrelated components of the phase space distribution are determined by fits to the energy spectra analogous to a quad scan in the transverse dimension. The combined analysis of the transverse and longitudinal data gives not only the slice and longitudinal emittances, but also any correlations due to wakefields or other effects. C1 Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Dowell, DH (reprint author), Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2104 EP 2106 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600656 ER PT B AU Palmer, DT Akre, R AF Palmer, DT Akre, R BE Chew, J Lucas, P Webber, S TI Experimental measurements of the ORION photoinjector drive laser oscillator subsystem SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Timing jitter measurements have been conducted on the ORION photoinjector laser oscillator pulse train output with respect to a ultra low noise crystal rf oscillator running at 79 1/3 MHz, the 36th harmonic of S-Band. The ORION laser oscillator subsystem consists of a Spectra-Physics Tsunami ultra-fast tunable (750 - 850nm) laser pumped by a Diode pumped Spectra-Physics Millennia VsP 5W. Overall laser oscillator subsystem performance will be presented. These measurements consist of the laser oscillator generated noise and transfer function from the RF reference input of the laser to an external photodiode RF output. Timing jitter measurements of less than 500 fsec have been attained with the laser oscillator tuned to 800 run. C1 SLAC, Stanford, CA USA. RP Palmer, DT (reprint author), SLAC, Stanford, CA USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2107 EP 2109 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600657 ER PT B AU Badea, SV Tsoupas, N Tuozzolo, J Alduino, J AF Badea, SV Tsoupas, N Tuozzolo, J Alduino, J BE Chew, J Lucas, P Webber, S TI Building a family of corrector magnets for SNS facility SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Spallation Neutron Source (SNS) in process to be built in Oak Ridge Tennessee includes an accumulator ring with a circumference of 248 meters, an injection line and an extraction line. The machine is designed to accumulate 2E+14, 1.0GeV kinetic-energy protons in 1 ms, via a charge exchange injection of H. This paper describes the concept behind the design and fabrication of five types of air cooled corrector magnets built in 15 functions totaling 80 magnets to be used in the above project. C1 Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA. RP Badea, SV (reprint author), Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2138 EP 2140 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600668 ER PT B AU Mapes, M Tsoupas, N AF Mapes, M Tsoupas, N BE Chew, J Lucas, P Webber, S TI Design of an ultra high vacuum compatible copper septum magnet SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB An Ultra High Vacuum compatible thin copper septum magnet has been developed at Brookhaven National Laboratory. The solid core, single turn magnet is pulsed at 1500 amps and has a field of 0.6 KG. The 0.76 mm thick copper septum is water-cooled and is designed to run at a maximum power of 2 KW. A remote positioning system is used to optimize the septum position during various extracted beams. The cross section of the septum magnet was modeled and 2-dimensional magnetic field calculations were performed to compute the magnetic field uniformity in the main field region and in the field strength in the fringe field region. The calculated field uniformity as well as comparison of the calculated fields in the fringe field region with the measured fields in the same region will be presented. The design and construction techniques used to fabricate this magnet will also be described. C1 Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA. RP Mapes, M (reprint author), Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2141 EP 2143 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600669 ER PT B AU Pai, C Catalan-Lasheras, N Eng, W Hseuh, H Lee, Y Lambiase, R Meng, W Sandberg, J Tepikian, S Tuozzolo, J AF Pai, C Catalan-Lasheras, N Eng, W Hseuh, H Lee, Y Lambiase, R Meng, W Sandberg, J Tepikian, S Tuozzolo, J BE Chew, J Lucas, P Webber, S TI Mechanical design of a ferrite-based injection kicker for SNS accumulator ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Two sets of kickers, 4 pulsed dipoles in each set, will be used in the SNS accumulator ring to create a dynamic orbit bump for injection process. These kickers are designed as large aperture, window frame magnets. The design of these 8 kickers have been completed. The first article kicker has been assembled and is being tested. In this paper we discuss the mechanical design criteria for these kickers, the layout in the accumulator ring, the magnetic field requirements and the ferrite based magnet field analysis, the eddy current and thermal considerations in the choice of ceramic vacuum chamber and its implementation. Also we discuss a wedge shaped clamp which was designed to reduce the vibration in the coil when powered at the 60 Hz repetition rate. C1 Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA. RP Pai, C (reprint author), Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA. RI Lambiase, Robert/E-1934-2013 NR 3 TC 1 Z9 2 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2144 EP 2146 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600670 ER PT B AU Pai, C Davino, D Hahn, H Hseuh, H Lee, Y Meng, W Mi, J Sandberg, J Tsoupas, N Tuozzolo, J Warburton, D Zhang, W AF Pai, C Davino, D Hahn, H Hseuh, H Lee, Y Meng, W Mi, J Sandberg, J Tsoupas, N Tuozzolo, J Warburton, D Zhang, W BE Chew, J Lucas, P Webber, S TI Mechanical design of fast extraction kicker and PFN for SNS accumulator ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Two kicker assemblies, seven pulsed magnet modules in each assembly, will be used in the SNS accumulator ring to kick the beam vertically to the extraction septum then to the target. These kickers are designed as window frame magnets housed inside a vacuum chamber. Fourteen Pulse Forming Networks (PFN) housed in separate silicon fluid containers are designed to power each kicker module. A single module prototype kicker magnet and PFN modulator have been successfully assembled and tested. In this paper we discuss the mechanical design criteria of these kicker assemblies, the installation layout in the accumulator ring, the structural analysis of the kicker chamber, the magnetic field analysis of the ferrite magnet, the high voltage feedthrough design, the structural design of the modulator container, the cooling and the thermal expansion considerations of the silicon fluids. C1 Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA. RP Pai, C (reprint author), Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA. OI Davino, Daniele/0000-0002-7492-8173 NR 5 TC 1 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2147 EP 2149 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600671 ER PT B AU Rank, J Malm, K Miglionico, G Raparia, D Tsoupas, N Tuozzolo, J Lee, YY AF Rank, J Malm, K Miglionico, G Raparia, D Tsoupas, N Tuozzolo, J Lee, YY BE Chew, J Lucas, P Webber, S TI Design considerations for a Lambertson Septum magnet for the spallation neutron source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Multiple-stage injections to an accumulator ring boost intensity until a final extraction delivers the full proton beam to a target transfer line. Kickers and an Extraction Lambertson Septum (ELS) magnet implement extraction. Studied here are various concerns of the design of an ELS magnet, including: lattice geometry, beam dynamics and optics considerations; and vacuum, electromagnetic and mechanical design aspects. Reference datum and transformations are established and shown schematically. Coil, yoke, and shield design optimization is discussed. C1 Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA. RP Rank, J (reprint author), Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA. NR 1 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2150 EP 2152 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600672 ER PT B AU Tsoupas, N Jackson, J Lee, YY Raparia, D Wei, J AF Tsoupas, N Jackson, J Lee, YY Raparia, D Wei, J BE Chew, J Lucas, P Webber, S TI Magnetic field calculations for a large aperture narrow quadrupole SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In the design of high-intensity proton synchrotrons and accumulator rings, quadrupole magnets of narrower size in one of the transverse dimensions are often needed to accommodate the compact ring geometry, the various injection and extraction devices, and the large vacuum chamber aperture. The stringent limit on tolerable beam loss further demands a good magnetic field quality to minimize beam resonances caused by higher-order magneticmultipoles. In this paper, we present results from magnetic field calculations performeed on 2D and 3D models of a large-Aperture narrow-quadrupoles that is suitable for a high intensity, low beam-loss accumulator rings. The pole face of the quadrupole has been optimized to minimize the integrated field of the first three allowed multipoles (12pole,20pole and 28pole). The ratio of each integrated magnetic-multipole-strength to the integrated magnetic-quadrupole-strength at a radius of 85% of the quad's pole-tip-radius is less than 2x10(-4). Results from the calculations performed on the two-dimensional and three-dimensional models of the narrow quad are presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Tsoupas, N (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 4 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2153 EP 2155 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600673 ER PT B AU Tuozzolo, J Alduino, J Badea, V Brodowski, J Mahler, G Raparia, D Seberg, S AF Tuozzolo, J Alduino, J Badea, V Brodowski, J Mahler, G Raparia, D Seberg, S BE Chew, J Lucas, P Webber, S TI Design and manufacturing of the SNS Accumulator Ring and transport system DC magnets SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Spallation Neutron Source* Accumulator Ring requires large aperture dipole magnets, strong focusing quadrupole and sextupole magnets, and low field corrector dipole, quadrupole, sextupole, and octopole magnets. All of these magnets will provide a fixed magnetic field throughout the accumulator's fill/storage/extraction cycle. Similar fixed field magnets are also being built for the beam transport lines from the linac and to the target. Because of the high intensity in the accumulator, the magnets must be built with tight tolerances for optimum field quality. Because some of the magnets are powered in strings, those magnets must have tight tolerances and consistent material properties to provide the same integral field from magnet to magnet. Radiation resistance, maintainability, and cost were other major factors in determining the magnets' design.(1) The accumulator ring and transport line lattice design required 32 different magnet types out of the 312 magnets to be installed. This resulted in small quantity procurements that affected the cost of fabrication and testing of the magnets. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Tuozzolo, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 1 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2156 EP 2158 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600674 ER PT B AU Wanderer, P Jackson, J Jain, A Lee, YY Meng, W Papaphilippou, Y Spataro, C Tepikian, S Tsoupas, N Wei, J AF Wanderer, P Jackson, J Jain, A Lee, YY Meng, W Papaphilippou, Y Spataro, C Tepikian, S Tsoupas, N Wei, J BE Chew, J Lucas, P Webber, S TI Final test results for the SNS ring dipoles SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB To meet the performance parameters of the Spallation Neutron Source (SNS) for high beam intensity with low losses, the compact accumulation ring will contain 32 sector dipoles with 1.44 m effective length and a large aperture, 170 mm. The magnets are built from potted coils and machined pieces of solid iron. When first assembled, the dipoles met the requirements for field uniformity but the rms variation of the integral transfer function (ITF) was much larger than design at both fields of interest, 1.11 T(.)m and 1.33 T(.)m, corresponding to proton energies of 1.0 GeV and 1.3 GeV respectively. Based on initial measurements, shims have been added to the return legs or poles, as appropriate, in order to bring the rms variation of the 1.0 GeV ITF to the specification, 0.01%. The value of the ITF rms variation at 1.3 GeV for the shimmed magnets is 0.033%. Sorting the magnets has significantly reduced the load on the correctors due to this ITF variation. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Wanderer, P (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 4 TC 1 Z9 1 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2159 EP 2161 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600675 ER PT B AU Wanderer, P Anerella, M Ganetis, G Ghosh, A Joshi, P Marone, A Muratore, J Schmalzle, J Soika, R Thomas, R Kaugerts, J Moritz, G Hassenzahl, W Wilson, MN AF Wanderer, P Anerella, M Ganetis, G Ghosh, A Joshi, P Marone, A Muratore, J Schmalzle, J Soika, R Thomas, R Kaugerts, J Moritz, G Hassenzahl, W Wilson, MN BE Chew, J Lucas, P Webber, S TI Initial test of a fast-ramped superconducting model dipole for GSI's proposed SIS200 accelerator SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Gesellschaft fur Schwerionenforschung (GSI) has proposed a large expansion of the existing facility in Darmstadt, Germany. The proposal includes an accelerator, SIS200, with rigidity of 200 T-m that utilizes 4 T superconducting dipoles ramped at 1 T/s. An R&D program including both the superconductor and the magnet is directed at achieving the desired ramp rate with minimal energy loss. The RHIC arc dipoles, with 8 cm aperture, possess adequate aperture and field strength but are ramped at only 1/20 of the desired rate. However, for reasons of speed and economy, the RHIC dipole is being used as the basis for this work. The superconductor R&D has progressed far enough to permit the manufacture of an initial cable with satisfactory properties. This cable has been used in the construction of a 1 m model magnet, appropriately modified from the RHIC design. The magnet has been tested successfully at 2 T/s to 4.38 T. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Wanderer, P (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 7 TC 7 Z9 7 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2162 EP 2164 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600676 ER PT B AU Brown, BC Capista, DP AF Brown, BC Capista, DP BE Chew, J Lucas, P Webber, S TI Beam based measurements of hysteresis effects in Fermilab Main Injector magnets SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Operation of the Fermilab Main Injector is sensitive to magnetic field differences due to hysteretic effects. Measurements using the beam are reported with various current ramps. This will provide magnetic field information for accelerator operations with better ramp control than is available from magnet test facility data. This makes possible improved low field reproducibility with mixed 120 GeV and 150 GeV operation of the Main Injector. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Brown, BC (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2165 EP 2167 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600677 ER PT B AU Ostiguy, JF Glass, HD Harding, DJ Lackey, J Robotham, W AF Ostiguy, JF Glass, HD Harding, DJ Lackey, J Robotham, W BE Chew, J Lucas, P Webber, S TI A new Lambertson magnet for the FNAL 400 MeV linac SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A new Lambertson magnet has been constructed for use at the downstream end of the Fermilab 400 MeV Linac. To reduce costs, the core is composed of laminations left over from the Main Injector dipoles with a round hole through one pole face. In contrast with more conventional Lambertson designs, the magnet is excited by two coils located above and below the field region. The integrated transverse fringe field at the end of the field-free region is minimized using a pole piece extension with 75% packing factor followed by a thick flux return plate. The relatively low packing factor prevents saturation of the extension by the return flux while preserving the odd longitudinal symmetry of the transverse flux distribution. Measurements show better than an order of magnitude reduction of the integrated transverse field, in good agreement with simulations. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ostiguy, JF (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 3 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2168 EP 2170 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600678 ER PT B AU Spencer, CM Rhee, SJ AF Spencer, CM Rhee, SJ BE Chew, J Lucas, P Webber, S TI Cost based Failure Modes and Effects Analysis (FMEA) for systems of accelerator magnets SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The proposed Next Linear Collider (NLC) has a proposed 85% overall availability goal, the availability specifications for all its 7200 magnets and their 6167 power supplies are 97.5% each. Thus all of the electromagnets and their power supplies must be highly reliable or quickly repairable. Improved reliability or repairability comes at a higher cost. We have developed a set of analysis procedures for magnet designers to use as they decide how much effort to exert, i.e. how much money to spend, to improve the reliability of a particular style of magnet. We show these procedures being applied to a standard SLAC electromagnet design in order to make it reliable enough to meet the NLC availability specs. First, empirical data from SLAC's accelerator failure database plus design experience are used to calculate MTBF for failure modes identified through a FMEA. Availability for one particular magnet can be calculated. Next, labor and material costs to repair magnet failures are used in a Monte Carlo simulation to calculate the total cost of all failures over a 30-year lifetime. Opportunity costs are included. Engineers choose from amongst various designs by comparing lifecycle costs. C1 SLAC, Menlo Pk, CA 94025 USA. RP Spencer, CM (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 4 TC 1 Z9 1 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2177 EP 2179 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600681 ER PT B AU Spencer, J Volk, J AF Spencer, J Volk, J BE Chew, J Lucas, P Webber, S TI Permanent magnets for radiation damage studies SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID ND-FE-B; FLUX LOSS; IRRADIATION; TEMPERATURE AB Permanent magnetic (PM) devices have many current and potential applications based on advantages in size, cost and simplicity but they suffer from uncertainties related to environmental and damage effects. One missing ingredient is a magnet designed to explicate demagnetization effects as a function of the principal magnetic characteristics of the device, the material, the blocks and their fab procedures - all of which need to be independently varied while minimizing the induced radioactivity from testing. We describe such a magnet and the measurements on it and its blocks and discuss the parameters of most interest as well as the constraints that motivate this choice. C1 SLAC, Menlo Pk, CA 94025 USA. RP Spencer, J (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2180 EP 2182 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600682 ER PT B AU Baggett, K Biallas, G Bullard, D Dail, J Douglas, D Hiatt, T McCrea, M AF Baggett, K Biallas, G Bullard, D Dail, J Douglas, D Hiatt, T McCrea, M BE Chew, J Lucas, P Webber, S TI Magnetic measurement of the 10 kW, IR FEL 180 degree dipole SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A family of large bending dipoles has been magnetically measured to support the 10 kW IR-FEL upgrade. This upgrade will allow for a wider wavelength range and an increase in the machine energy to operate between 80 MeV/c and 210 MeV/c. The dipole magnets allow the beam to bend 180 degrees over a I meter radius. The requirements for these magnets include varying field strengths, large horizontal apertures and parts in 10,000 field homogeneity as well as setability of core and integrated field. This paper will describe the process involved in measuring and achieving these requirements. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA USA. RP Baggett, K (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2183 EP 2185 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600683 ER PT B AU Biallas, GH Baggett, K Douglas, DR Hiatt, T Wines, R Schultheiss, TJ Christina, VA Rathke, J Smirnov, A Newsham, D Luo, Y Yu, D AF Biallas, GH Baggett, K Douglas, DR Hiatt, T Wines, R Schultheiss, TJ Christina, VA Rathke, J Smirnov, A Newsham, D Luo, Y Yu, D BE Chew, J Lucas, P Webber, S TI Magnetic modeling vs measurements of the dipoles for the JLab 10 kW free electron laser upgrade SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Magnetic measurements of the six families of dipoles for the infrared Free Electron Laser Upgrade at the Thomas Jefferson National Accelerator Facility (Jlab) are compared to the magnetic models on which their design is based. The magnets were designed in parallel by three organizations. They used ANSYS, Radia or Opera 3D as a 3D magnetic modeling program. Comparison of the discrepancies between model and magnet measurement is presented along with analysis of their potential causes. These dipoles operate in two field ranges. The Injector/Extractor Dipoles operate around 0.05 T and the Arc Dipoles and Optical Chicane Dipoles operate between 0.22 to 0.71 T. All magnets are required to meet core field and field integral flatness to parts in 104 over their "good field" region. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Biallas, GH (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Blvd, Newport News, VA 23606 USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2186 EP 2188 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600684 ER PT B AU Hiatt, T Baggett, K Beek, M Biallas, G Douglas, D Sullivan, K Tennant, C AF Hiatt, T Baggett, K Beek, M Biallas, G Douglas, D Sullivan, K Tennant, C BE Chew, J Lucas, P Webber, S TI Magnetic measurement of the 10 kW, IR FEL dipole magnets SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Magnetic measurements have been performed on several families of dipoles for the 10 kW IR-FEL presently under construction at the Thomas Jefferson National Accelerator Facility. The requirements for these magnets include varying field strengths, large horizontal apertures and parts in 10,000 field homogeneity as well as setability of core and integrated field. Measurements were made to quantify the magnets according to these requirements and to determine the hysteresis protocol, ramp rate dependence, and field clamp settings that are used. This paper will describe the results of these measurements and the procedures used to accomplish them. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA USA. RP Hiatt, T (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA USA. NR 7 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2189 EP 2191 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600685 ER PT B AU Bai, M Peggs, S Roser, T Satogata, T Trbojevic, D AF Bai, M Peggs, S Roser, T Satogata, T Trbojevic, D BE Chew, J Lucas, P Webber, S TI Measuring beta function and phase advance in RHIC with an AC dipole SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB High energy hadron collider operation requires accurate measurements of the beta functions and phase advances, to check the linear optics and to locate gradient errors. During the RHIC 2003 run, two AC dipoles with vertical and horizontal magnetic field [1] were used to measure the linear optics at storage and at injection energies. The two AC dipoles are set up to adiabatically induce sizable coherent oscillations at a frequency close to the betatron frequencies. The beta functions and phase advances are then calculated from the 1024 turn-by-turn measurements available from all the RHIC BPMs (Beam Position Monitors). Because the coherent excitation is adiabatic, the beam emittance is preserved after the measurement. The algorithm is discussed in this paper, and experimental results are presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Bai, M (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2204 EP 2206 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600690 ER PT B AU Bai, M Pilat, R Satogata, T Tomas, R Schmidt, F Calaga, R AF Bai, M Pilat, R Satogata, T Tomas, R Schmidt, F Calaga, R BE Chew, J Lucas, P Webber, S TI Measurement of linear coupling resonance in RHIC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Linear coupling is one of the factors that determine beam lifetime in RHIC. The traditional method of measuring the minimum tune separation requires a tune scan and can't be done parasitically or during the acceleration ramp. A new technique of using ac dipoles to measure linear coupling resonance has been developed at RHIC. This method measures the degree of coupling by comparing the amplitude of the horizontal coherent excitation with the amplitude of the vertical coherent excitation if the beam is excited by the vertical AC dipole and vice versa. One advantage of this method is that it can be done without changing tunes from the normal machine working points. In principle, this method can also localize the coupling source by mapping out the coupling driving terms throughout the ring. This is very useful for local decoupling the interaction regions in RHIC. A beam experiment of measuring linear coupling has been performed in RHIC during its 2003 run, and the analysis of the experimental data is discussed in this paper. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Bai, M (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2207 EP 2209 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600691 ER PT B AU Berg, JS AF Berg, JS BE Chew, J Lucas, P Webber, S TI Linear model for non-isosceles absorbers SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Previous analyses have assumed that wedge absorbers are triangularly shaped with equal angles for the two faces. In this case, to linear order, the energy loss depends only on the position in the direction of the face tilt, and is independent of the incoming angle. One can instead construct an absorber with entrance and exit faces facing rather general directions. In this case, the energy loss can depend on both the position and the angle of the particle in question. This paper demonstrates that and computes the effect to linear order. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Berg, JS (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. RI Berg, Joseph/E-8371-2014 OI Berg, Joseph/0000-0002-5955-6973 NR 6 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2210 EP 2212 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600692 ER PT B AU Berg, JS Kirk, H Garren, A AF Berg, JS Kirk, H Garren, A BE Chew, J Lucas, P Webber, S TI Linear design of combined-function ionization cooling lattices SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Ionization cooling lattices simultaneously require small beta-functions at the absorber and large energy acceptances to be effective. Simultaneously achieving these goals as well as having a good dynamic aperture requires that the lattice be relatively compact. If one wishes to avoid solenoids, one choice for creating such a lattice is to use combined-function magnets. These magnets can simultaneously focus in both planes, allowing one to achieve a low beta in both planes with a minimum number of magnets. In this paper we explore the design of lattices which contain only combined-function bending magnets using a thin-lens approximation, showing how to optimally achieve the requirements for muon cooling. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Berg, JS (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. RI Berg, Joseph/E-8371-2014 OI Berg, Joseph/0000-0002-5955-6973 NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2213 EP 2215 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600693 ER PT B AU Berg, JS Johnstone, C AF Berg, JS Johnstone, C BE Chew, J Lucas, P Webber, S TI Design of FFAGs based on a FODO lattice SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB An FFAG is a lattice with fixed magnetic fields that has an extremely wide energy acceptance. One particularly simple type of FFAG is based on a FODO lattice, where both quads can be combined-function bending/quadrupole magnets. The spaces between the combined-function magnets are left open for RF cavities and other hardware. This paper descibes a general method for creating lattice designs for this type of lattice which gives the lattice optimal properties for an FFAG accelerator. The properties of this lattice as a function of input parameters are explored. The use of sextupoles to improve lattice properties is also explored. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Berg, JS (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. RI Berg, Joseph/E-8371-2014 OI Berg, Joseph/0000-0002-5955-6973 NR 3 TC 7 Z9 7 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2216 EP 2218 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600694 ER PT B AU Berg, JS Kirk, H Garren, A AF Berg, JS Kirk, H Garren, A BE Chew, J Lucas, P Webber, S TI End field effects in bend-only cooling lattices SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Cooling lattices consisting only of bends (using either rotated pole faces or gradient dipoles to achieve focusing) often require large apertures and short magnets. One expects the effect of end fields to be significant in this case. In this paper we explore the effect of adding end fields to a working lattice design that originally lacked them. The paper describes the process of correcting the lattice design for the added end fields so as to maintain desirable lattice characteristics. It then compares the properties of the lattice with end fields relative to the lattice without them. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Berg, JS (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. RI Berg, Joseph/E-8371-2014 OI Berg, Joseph/0000-0002-5955-6973 NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2219 EP 2221 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600695 ER PT B AU Fischer, W AF Fischer, W BE Chew, J Lucas, P Webber, S TI Linear coupling correction with N-turn maps SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The linear one-turn map of a storage ring contains coupling information on which a correction algorithm can be based. In principal, the one-turn matrix can be fitted from turn-by-turn data of beam position monitors after a kick was applied. However, the so obtained coupling information often sinks into the noise floor. The signal-to-noise ratio of the coupling information can be greatly enhanced by fitting maps for larger turn numbers N, equal to half the beat period. With the so obtained N-turn map an automated global coupling correction is possible without the need for a tune change. This is demonstrated for the Relativistic Heavy Ion Collider where the algorithm is implemented for operational use at injection. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fischer, W (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2222 EP 2224 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600696 ER PT B AU Robin, D Steier, C Wan, W Wolski, A AF Robin, D Steier, C Wan, W Wolski, A BE Chew, J Lucas, P Webber, S TI Impact of narrow gap undulators on the advanced light source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In low emittance synchrotron light sources the main source of beam loss is intrabeam or Touschek scattering. In most cases the Touschek scattered particles get lost on the vacuum chamber with the narrowest vertical gap. The particles reach the vertical chamber from either diffusion or coupling of the particle motion from the horizontal to the vertical plane. The beam lifetime can be very sensitive to the size of the vertical chamber that can limit the dynamic momentum aperture. The reduction in lifetime limits the minimum size of the chamber that can be installed in the ring. In this paper we examine the effect of the size of the vertical apertures on the beam lifetime at the ALS under various different machine conditions. We show that there are conditions where one can make the beam lifetime much less sensitive to the size of the vertical aperture. C1 LBNL, Berkeley, CA 94720 USA. RP Robin, D (reprint author), LBNL, Berkeley, CA 94720 USA. OI Wolski, Andrzej/0000-0002-5057-5588 NR 10 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2246 EP 2248 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600704 ER PT B AU Wan, WS Nishimura, H Robin, D Steier, C AF Wan, WS Nishimura, H Robin, D Steier, C BE Chew, J Lucas, P Webber, S TI ID modeling at the ALS SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB At the Advanced Light Source there are several projects being proposed that will require high field insertion devices. It is important that these devices do not significantly impact the performance of the machine. In particular they should not degrade the beam lifetime or injection efficiency. It is known that high field devices with large field roll off can impact the beam lifetime. It is therefore important to model the effect of the insertion devices including both transverse and longitudinal field roll off. In this paper we present the result of tracking studies using an explicit symplectic integrator with both transverse and longitudinal field roll off. The simulations show where sufficiently large field roll off will impact the beam lifetime. C1 LBNL, Berkeley, CA 94720 USA. RP Wan, WS (reprint author), LBNL, Berkeley, CA 94720 USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2249 EP 2251 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600705 ER PT B AU Kabel, AC AF Kabel, AC BE Chew, J Lucas, P Webber, S TI Maxwell-Lorentz equations in general Frenet-Serret coordinates SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We consider the trajectory of a charged particle in an arbitrary external magnetic field. A local orthogonal coordinate system is given by the tangential, curvature, and torsion vectors. We write down Maxwell's equations in this coordinate system. The resulting partial differential equations for the magnetic fields fix conditions among its local multipole components, which can be viewed as ageneralization of the usual multipol expansion of the fields of magnetic elements. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Kabel, AC (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2252 EP 2254 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600706 ER PT B AU Terebilo, A AF Terebilo, A BE Chew, J Lucas, P Webber, S TI Global Beam-Based Alignment method SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB This paper presents an algorithm for orbit centering in the quadrupole magnets developed specifically for the early commissioning stage of SPEAR3 light source. During commissioning many factors can reduce the effectiveness of simpler beam-based alignment techniques. Our method is more tolerant towards inaccurate optics model, undetected large alignment errors, systematic errors and faults in the BPM system. C1 SLAC, Menlo Pk, CA 94025 USA. RP Terebilo, A (reprint author), SLAC, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2255 EP 2257 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600707 ER PT B AU Emery, L Vasserman, I Makarov, O Deriy, B Sasaki, S Soliday, R AF Emery, L Vasserman, I Makarov, O Deriy, B Sasaki, S Soliday, R BE Chew, J Lucas, P Webber, S TI Feedforward correction of the pulsed circularly polarizing undulator at the advanced photon source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A circularly polarizing undulator capabable of switching the polarization very rapidly was installed at the Advanced Photon Source. The net magnetic field perturbation is characterized in both planes by a transient orbit motion, which lasts about 30 ms, and a DC orbit shift. In addition, multipole magnetic moment errors are present. The correction system consists of small dipole and multipole correction magnets at the ends of the undulator, a multichannel arbitrary function generator (AFG) to program the corrector magnet current triggered on the polarization change event, low-level software to load and interpolate the AFG waveforms, and high-level software running on a workstation to determine the optimum AFG waveforms for the dipole correctors. We rely on the existing real-time feedback system to acquire the orbit transient and to automatically generate a close approximation of the required corrector wave forms. A choice of deterministic correction or trial-and-error manual adjustments of the wave forms is available in the high-level software. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Emery, L (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2261 EP 2263 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600709 ER PT B AU Decker, FJ Kulikov, A Sullivan, M AF Decker, FJ Kulikov, A Sullivan, M BE Chew, J Lucas, P Webber, S TI Bunch pattern by-3 in PEP-II SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB After a long 4-month down time where additional RF was installed and heating problems addressed, the PEP-II B-factory should be capable of delivering about 1.5 times the currents. This can only be done by going to more bunches from a full by-4 pattern to either a partly filled by-3 or by-2 pattern. The by-2 pattern has parasitic crossings, so the by-3 pattern is the next candidate. Heating issues from the different higher order modes, especially in the longitudinal and transverse feedback structures are a concern. Effects from an electron cloud seem to be still visible in the by-3 and by-2 pattern. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Decker, FJ (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2282 EP 2284 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600716 ER PT B AU Decker, FJ Akre, R Fisher, A Iverson, RH Weaver, M AF Decker, FJ Akre, R Fisher, A Iverson, RH Weaver, M BE Chew, J Lucas, P Webber, S TI Injection related background due to the transverse feedback SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The background in the BaBar detector is especially high during injection, when most components are actually having reduced voltages. The situation is worse for the beam in High Energy Ring (HER) when the LER beam is present. It was found that the transverse feedback system plays an important role when stacking more charge on top of existing bunches. Lowering the feedback gain helped and it was realized later that the best scenario would be to gate off the feedback for only the one bunch, which got additional charge injected into it. The explanation is that the blown-up, but centered, original HER bunch plus the small injected off-axis bunch (each with half the charge) would stay in the ring if not touched, but the feedback system sees half the offset and wants to correct it, therefore disturbing and scraping the blown-up part. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Decker, FJ (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2285 EP 2287 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600717 ER PT B AU Cai, Y Donald, MHR Nosochkov, Y AF Cai, Y Donald, MHR Nosochkov, Y BE Chew, J Lucas, P Webber, S TI Lattice with smaller momentum compaction factor for PEP-II high energy ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB At present, the PEP-II bunch length and vertical beta function beta*(y) at the Interaction Point (IP) are about of the same size. To increase luminosity, it is planned to gradually reduce beta*(y). For the maximum effect, bunch length has to be also reduced along with beta*(y) to minimize luminosity y loss caused by the hourglass effect at IP. One of the methods to achieve a smaller bunch length is to reduce momentum compaction factor. This paper discusses a lattice option for the High Energy Ring, where the nominal 60degrees cells in four arcs are replaced by 90degrees cells to reduce momentum compaction factor by 30% and bunch length by 16%. The increased focusing in 90degrees cells results in 40% stronger arc quadrupoles and 150% stronger arc sextupoles due to reduced dispersion and larger chromaticity. Tracking simulations predict that dynamic aperture for this lattice will be greater than or equal to 10 times the rms size of a fully coupled beam for a horizontal emittance of 30 nm and beta*(y) = 1 cm. The lattice y modification and results of simulations are presented. C1 SLAC, Menlo Pk, CA 94025 USA. RP Cai, Y (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2288 EP 2290 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600718 ER PT B AU Cai, Y Nosochkov, Y AF Cai, Y Nosochkov, Y BE Chew, J Lucas, P Webber, S TI Tracking simulations near half-integer resonance at PEP-II SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Beam-beam simulations predict that PEP-II luminosity can be increased by operating the horizontal betatron tune near and above a half-integer resonance. However, effects of the resonance and its synchrotron sidebands significantly enhance betatron and chromatic perturbations which tend to reduce dynamic aperture. In the study, chromatic variation of horizontal tune near the resonance was minimized by optimizing local sextupoles in the Interaction Region. Dynamic aperture was calculated using tracking simulations in LEGO code. Dependence of dynamic aperture on the residual orbit, dispersion and beta distortion after correction was investigated. C1 SLAC, Menlo Pk, CA 94025 USA. RP Cai, Y (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2291 EP 2293 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600719 ER PT B AU Novokhatski, A Seeman, J Sullivan, M AF Novokhatski, A Seeman, J Sullivan, M BE Chew, J Lucas, P Webber, S TI RF heating and temperature oscillations due to a small gap in a PEP-II vacuum chamber SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Wake fields excited in a small gap of a vacuum chamber by ampere beams can have enough amplitude to heat the chamber. The electric component of these fields can be above the arcing limit. Usually flange connections in a vacuum chamber contain a vacuum gasket and an inner RF gasket. If a small gap occurs between the RF gasket and flange surface, wake fields can heat the flanges. The flanges are usually made of stainless steel, which efficiently absorbs RF power. Some flanges consist of two parts (like a vacuum valve flange) and are mechanically connected but have poor thermal contact. A temperature rise can lengthen the inner part of the flange and make firmer the thermal contact to the outer part of the flange. The heat will then flow to the outer part of the flange, which is air and water-cooled. This cooling lowers the flange temperature and the thermal contact becomes poor again. This "quasi" periodic mechanism can explain the nature of temperature oscillations observed at several locations in PEP-II, the SLAC B-factory. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Novokhatski, A (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 2 TC 4 Z9 4 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2294 EP 2296 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600720 ER PT B AU Seeman, J Browne, M Cai, Y Colocho, W Decker, FJ Donald, M Ecklund, S Erickson, R Fisher, A Fox, J Heifets, S Iverson, R Kozanecki, W Krejcik, P Kulikov, A Novokhatski, A Schuh, P Schwarz, H Stanek, N Sullivan, M Teytelman, D Turner, J Wienands, U Yan, Y Yocky, J Biagini, M AF Seeman, J Browne, M Cai, Y Colocho, W Decker, FJ Donald, M Ecklund, S Erickson, R Fisher, A Fox, J Heifets, S Iverson, R Kozanecki, W Krejcik, P Kulikov, A Novokhatski, A Schuh, P Schwarz, H Stanek, N Sullivan, M Teytelman, D Turner, J Wienands, U Yan, Y Yocky, J Biagini, M BE Chew, J Lucas, P Webber, S TI Progress of the PEP-II B-Factory SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB PEP-II is an e(+)e(-) B-Factory Collider located at SLAC operating at the Upsilon 4S resonance. PEP-II has delivered, over the past five years, an integrated luminosity to the BaBar detector of over 131 fb(-1) and has reached a luminosity of 6.1 1 x 10(36)/cm(2)/s. Steady progress is being made in reaching higher luminosity. The goal over the next several years is to reach a luminosity of at least 2 x 10(34)/cm(2)/s. The accelerator physics issues being addressed in PEP-II to reach this goal include the electron cloud instability, beam-beam effects, parasitic beam-beam effects, high RF beam loading, shorter bunches, lower betay*, interaction region operation, and coupling control. A view of the PEP-II tunnel is shown in Figure 1. The present parameters of the PEP-II B-Factory are shown in Table 1 compared to the design. The present peak luminosity is 204% of design and the best integrated luminosity per month is 7.4 fb(-1) that is 225% of design. The best luminosity per month is shown in Figure 2. The integrated luminosity over a month is shown in Figure 3 and the total integrated luminosity in shown in Figure 4. The progress in luminosity has come from correcting the orbits, adding specific orbit bumps to correct coupling and dispersion issues, lowering the beta y* in the LER, and moving the fractional horizontal tunes in both rings to just above the half integer (<0.52). C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Seeman, J (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2297 EP 2299 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600721 ER PT B AU Seeman, J Cai, Y Decker, FJ Ecklund, S Fisher, A Fox, J Heifets, S Nosochkov, Y Novokhatski, A Sullivan, M Teytelman, D Wienands, U Yan, Y Biagini, M AF Seeman, J Cai, Y Decker, FJ Ecklund, S Fisher, A Fox, J Heifets, S Nosochkov, Y Novokhatski, A Sullivan, M Teytelman, D Wienands, U Yan, Y Biagini, M BE Chew, J Lucas, P Webber, S TI Design studies for a 10(36) Super-B-Factory SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A Super B Factory, an asymmetric e(+)e(-) collider with a luminosity of 10(36) cm(-2)s(-1), can provide a sensitive probe of new physics in the flavor sector of the Standard Model. The success of PEP-II and KEKB in producing unprecedented luminosity with unprecedently short commissioning time has taught us about the accelerator physics of asymmetric e(+)e(-) colliders in a new parameter regime. It appears to be possible to build on this success to advance the state of the accelerator art by building a collider at a luminosity approaching 10(36) cm(-2)s(-1). Such a collider would produce an integrated luminosity of 10,000 fb(-1) (10 ab(-1)) in a running year. Design studies are underway to arrive at a complete parameter set based on a collider in the PEP-II tunnel but with an upgraded RF system (perhaps a higher frequency) and an upgraded interaction region [1-6]. C1 SLAC, Menlo Pk, CA 94025 USA. RP Seeman, J (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2300 EP 2302 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600722 ER PT B AU Arnold, ND Dohan, DA AF Arnold, ND Dohan, DA BE Chew, J Lucas, P Webber, S TI Connection-oriented relational database of the APS control system hardware SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB After the flurry of activity to construct, commission, and begin routine operation of a large user facility, the focus must then turn to long-term reliability. Key concerns include a full inventory of all installed devices, sufficient spares, quick identification of a failed device, and accurate documentation to minimize the number of system experts needed for routine maintenance. This paper describes the Visual Connection Configuration Tool (VCCT) used in creating a searchable schema of all control system hardware. A framework is provided for identifying each installed device and its connection to the control system. The schema provides numerous benefits over a simple inventory list, such as: an immediate visualization of information flow through the system, intuitive documentation of input/output controller (IOC) hardware, subnet links and nodes, and a common presentation for easier cross training and maintenance. The paper will also describe the mechanisms used to automatically populate much of the database by "discovering" the hardware through the EPICS databases and start-up scripts. Future work, such as extending the device definition to include wiring information will also be discussed. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Arnold, ND (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2327 EP 2329 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600731 ER PT B AU Emery, L Borland, M Shang, H AF Emery, L Borland, M Shang, H BE Chew, J Lucas, P Webber, S TI Use of a general-purpose optimization module in accelerator control SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The SDDS EPICS toolkit has recently been enhanced by the addition of a general-purpose optimizer. The tool sddsoptimize is easily configured and has features that make it robust. The sddsoptimize program has been incorporated in many new Tcl/Tk applications used for various Advanced Photon Source tune-up operations, such as injection tune-up for the storage ring, coupling minimization of the storage ring, and the automatic phasing of the linac. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Emery, L (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 1 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2330 EP 2332 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600732 ER PT B AU Lewellen, JW Pasky, S AF Lewellen, JW Pasky, S BE Chew, J Lucas, P Webber, S TI An operator training facility at the Advanced Photon Source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Advanced Photon Source (APS), a premier third-generation synchrotron radiation source, presently operates in top-up mode during most user run time. During top-up mode, charge is injected into the storage ring at approximately 2-minute intervals to stabilize the stored beam current to within 0.1%. Top-up mode requires the dedicated use of the entire APS injector system, severely limiting time available for operator training. The APS injector test stand (ITS) is presently configured to operate a ballistic bunch compression (BBC) rf gun, which uses three independently powered and phased rf cavities, and either a thermionic cathode or a photocathode. Operation of the BBC gun requires cavity phasing and input rf power selection analogous to the operation of a high-energy linac. In conjunction with the ITS beamline components (quadrupoles, dipoles, diagnostics, correctors), this provides an effective analog to the APS linac. Operators can therefore practice accelerator tuning and control methods with a live beam and -real components, rather than simulations, while top-up operation is ongoing. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Lewellen, JW (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2333 EP 2335 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600733 ER PT B AU Bhat, CM AF Bhat, CM BE Chew, J Lucas, P Webber, S TI Antiproton stacking and un-stacking in the Fermilab Recycler Ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Fermilab Recycler Ring (RR) is intended to be used as a future antiproton storage ring for the Run II protonantiproton collider operation. It is proposed that about 40mA of antiproton beam from the Accumulator Ring will be transferred to the Recycler once for every two to three hours, stacked and cooled. This operation continues for about 10 to 20 hours depending on the collider needs for antiprotons. Eventually, the cooled antiproton beam will be un-stacked from the Recycler and transferred to the Tevatron via the Main Injector. We have simulated stacking and un-stacking of antiprotons in the Recycler using multi-particle beam dynamics simulation code ESME [1]. In this paper we present results of these simulations. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Bhat, CM (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2345 EP 2347 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600737 ER PT B AU Cadorna, A Bhat, CM Crisp, J Fellenz, B AF Cadorna, A Bhat, CM Crisp, J Fellenz, B BE Chew, J Lucas, P Webber, S TI Gated current integrator for the beam in the RR barrier buckets SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB At the Fermilab Recycler Ring (RR), the antiproton (pbar) beam will be stored azimuthally in different segments created by barrier buckets. The beam in each segment may have widely varying intensities. We have developed a gated integrator system to measure the beam intensity in each of the barrier bucket. Here we discuss the design of the system and the results of beam measurements using the integrator. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Cadorna, A (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 4 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2348 EP 2350 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600738 ER PT B AU Oothoudt, M Schaller, S Bjorklund, E Burns, M Carr, G Faucett, J Hayden, D Lusk, M Merl, R Potter, J Reynolds, J Romero, D Shelley, F AF Oothoudt, M Schaller, S Bjorklund, E Burns, M Carr, G Faucett, J Hayden, D Lusk, M Merl, R Potter, J Reynolds, J Romero, D Shelley, F BE Chew, J Lucas, P Webber, S TI The LANSCE RICE control system upgrade SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The LANSCE (Los Alamos Neutron Science Center) control system upgrade program continues with the impending replacement of the RICE (Remote Instrumentation and Control Equipment) subsystem. The RICE subsystem upgrade is a challenge because of its technology (late 1960's), number of channels (>10,000), and unique characteristics (all-modules data takes, timed/flavored data takes). The plan is to replace at least the non-timed data and the command portions of the subsystem with Programmable Logic Controllers (PLCs). We discuss motivations, technological challenges, proof-of-principle, and planning. The boundary condition, as usual, is that we must implement these major changes on a running accelerator. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Oothoudt, M (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2354 EP 2356 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600740 ER PT B AU Chu, CM Galambos, J Klotz, WD Pelaia, T Shishlo, A Allen, CK McChesney, C Pattengale, N Ottavio, D AF Chu, CM Galambos, J Klotz, WD Pelaia, T Shishlo, A Allen, CK McChesney, C Pattengale, N Ottavio, D BE Chew, J Lucas, P Webber, S TI Application programming structure and physics applications SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Spallation Neutron Source (SNS) is using a Java based hierarchal framework for application program development. The framework is designed to provide an accelerator physics programming interface to the accelerator, called XAL. Much of the underlying interface to the EPICS control system is hidden from the user. Use of this framework allows writing of general-purpose applications that can be applied to various parts of the accelerator. Also, since the accelerator structure is initiated from a database, introduction of new beamline devices or signal modifications are immediately available for all XAL applications. Direct scripting interfaces are available for both Jython and Matlab, for rapid prototyping uses. Initial applications such as orbit difference, orbit correction and a general purpose diagnostic tool have been developed and tested with the SNS front end. The overall framework is described, and example applications are shown. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Chu, CM (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2360 EP 2362 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600742 ER PT B AU Galambos, J Chu, C Danilova, E Shishlo, A Patton, J Pelaia, T Klotz, WD AF Galambos, J Chu, C Danilova, E Shishlo, A Patton, J Pelaia, T Klotz, WD BE Chew, J Lucas, P Webber, S TI SNS global database use in application programming SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A global relational database is being assembled to track accelerator components for the Spallation Neutron Source (SNS). As part of this activity, beamline element information is stored for use in high level application programs. A hierarchal accelerator framework is generated from the database and used for initialization of a Java based programming infrastructure. From within this framework input files for beam simulation codes can be generated using either live machine values or design values. The database also includes global coordinates for beamline element alignment, and magnet measurement data. An overview of the table schema and relationships to tables used in other parts of the project are discussed. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Galambos, J (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2363 EP 2365 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600743 ER PT B AU Shishlo, A Chu, P Galambos, J Pelaia, T AF Shishlo, A Chu, P Galambos, J Pelaia, T BE Chew, J Lucas, P Webber, S TI The EPICS based virtual accelerator - Concept and implementation SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A virtual accelerator (VA) concept and an implementation founded on TRACE3D and PARMILA codes are presented. This virtual accelerator is suitable for accelerators with a control system based on EPICS and consists of the EPICS portable channel access server (PCAS), the EPICS client providing communication between a simulation model and PCAS, and the simulation model itself The virtual accelerators for the SNS linac and experience in using these VAs are discussed. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP Shishlo, A (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. NR 2 TC 2 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2366 EP 2368 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600744 ER PT B AU Corbett, J Portmann, G Terebilo, A AF Corbett, J Portmann, G Terebilo, A BE Chew, J Lucas, P Webber, S TI Accelerator control middle layer SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB This paper reviews an efficient implementation of the software 'middle layer' that resides between high-level accelerator control applications and the low-level accelerator control system. The middle layer software is written in MATLAB and includes links to the EPICS Channel Access Library. Functionally, the middle layer syntax closely parallels the Family/Index naming scheme used in many accelerator simulation codes and uses the same convention to communicate with both the online machine and the accelerator model. Hence, machine control, machine simulation and data analysis tools are integrated into a single, easy-to-use software package. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Corbett, J (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 9 TC 5 Z9 5 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2369 EP 2371 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600745 ER PT B AU Terebilo, A Keeley, D Corbett, J Portmann, G AF Terebilo, A Keeley, D Corbett, J Portmann, G BE Chew, J Lucas, P Webber, S TI Simulated commissioning of SPEAR 3 storage ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In preparation for the commissioning and operations of SPEAR3 we developed a number of high-level accelerator control applications. We also developed a test platform that simulates the physics of a storage ring. To any application using EPICS Channel Access protocol it appears as a real storage ring: measurable parameters such as orbits and tunes change in response to the changes in the accelerator hardware setpoints. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Terebilo, A (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2372 EP 2372 PG 1 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600746 ER PT B AU Plawski, T Allison, T Delayen, J Hovater, C Powers, T AF Plawski, T Allison, T Delayen, J Hovater, C Powers, T BE Chew, J Lucas, P Webber, S TI Low level RF system for Jefferson Lab Cryomodule Test Facility SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Jefferson Lab Cryomodule Test Facility (CMTF) has been upgraded to test and commission SNS and CEBAF Energy Upgrade cryomodules. Part of the upgrade was to modernize the superconducting cavity instrumentation and control. We have designed a VXI based RF control system exclusively for the production testing of superconducting cavities. The RF system can be configured to work either in Phase Locked Loop (PLL) or Self Excited Loop (SEL) mode. It can be used to drive either SNS 805 MHz or CEBAF Energy Upgrade 1497 MHz superconducting cavities and can be operated in pulsed or continuous wave (CW) mode. The base design consists of RF-analog and digital sections. The RF-analog section includes a Voltage Control Oscillator (VCO), phase detector, I&Q modulator and "low phase shift" limiter. The digital section controls the analog section and includes ADC, FPGA, and DAC. We will discuss the design of the RF system and how it relates to the support of cavity testing. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Plawski, T (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. NR 3 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2379 EP 2381 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600749 ER PT B AU Nishimura, H Timossi, C McDonald, JL AF Nishimura, H Timossi, C McDonald, JL BE Chew, J Lucas, P Webber, S TI Cross platform SCA component using C++ builder and Kylix SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A cross-platform component for EPICS Simple Channel Access (SCA) has been developed. EPICS client programs with GUI become portable at their C++ source-code level both on Windows and Linux by using Borland C++ Builder 6 and Kylix 3 on these platforms respectively. C1 LBNL, Berkeley, CA 94720 USA. RP Nishimura, H (reprint author), LBNL, Berkeley, CA 94720 USA. NR 5 TC 0 Z9 0 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2385 EP 2386 PG 2 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600751 ER PT B AU Tepikian, S Anderson, R Hemmer, M Hseuh, HC Jackson, J Jain, A Karl, F Lee, YY McGahern, W Raparia, D Savage, R Tuozzolo, J Wanderer, P Wei, J AF Tepikian, S Anderson, R Hemmer, M Hseuh, HC Jackson, J Jain, A Karl, F Lee, YY McGahern, W Raparia, D Savage, R Tuozzolo, J Wanderer, P Wei, J BE Chew, J Lucas, P Webber, S TI SNS Ring and transport system magnet acceptance and installation preparation SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Installation of the magnets in the SNS-Ring, or any accelerator, requires quality assurance to minimize problems. The geometry of the ring was frozen and the dipole length was adjusted to reflect the measured dipoles magnetic length to aid the installation process. The approach established here is based on the Magnet Acceptance procedures used for RHIC [1]. The magnets are first measured and checked on the bench for mechanical and electrical characteristics, field strength, multipole strengths, survey, etc. Each group performing these measurements determines whether the magnet is within the design specifications. A magnet that passes is accepted. A magnet that fails may be accepted if the problem can be either repaired or reworked and retested to specifications. Such a magnet is classified as a spare or fixed. Furthermore, once accepted, these magnets are assembled into units such as the full half cell assemblies before being shipped for installation. These assemblies have a checkout list as well. C1 BNL, Long Isl City, NY USA. RP Tepikian, S (reprint author), BNL, Long Isl City, NY USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2390 EP 2392 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600753 ER PT B AU Wolski, A Walker, NJ AF Wolski, A Walker, NJ BE Chew, J Lucas, P Webber, S TI A model of ATL ground motion for storage rings SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Low emittance electron storage rings, such as those used in third generation light sources or linear collider damping rings, rely for their performance on highly stable alignment of the lattice components. Even if all vibration and environmental noise sources could be suppressed, diffusive ground motion will lead to orbit drift and emittance growth. Understanding such motion is important for predicting the performance of a planned accelerator and designing a correction system. A description (known as the ATL model) of ground motion over relatively long time scales has been developed and has become the standard for studies of the long straight beamlines in linear colliders. Here, we show how the model may be developed to include beamlines of any geometry. We apply the model to the NLC and TESLA damping rings, to compare their relative stability under different conditions. C1 LBNL, Berkeley, CA 94720 USA. RP Wolski, A (reprint author), LBNL, Berkeley, CA 94720 USA. OI Wolski, Andrzej/0000-0002-5057-5588 NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2396 EP 2398 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600755 ER PT B AU Corlett, JN Doolittle, L Schoenlein, R Staples, J Wilcox, R Zholents, A AF Corlett, JN Doolittle, L Schoenlein, R Staples, J Wilcox, R Zholents, A BE Chew, J Lucas, P Webber, S TI Techniques for synchronization of x-ray pulses to the pump laser in an ultrafast x-ray facility SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID SUBFEMTOSECOND TIMING JITTER AB Accurate timing of ultrafast x-ray probe pulses emitted from a synchrotron radiation source with respect to the signal initiating a process in the sample under study is critical for the investigation of structural dynamics in the femtosecond regime. We describe schemes for achieving accurate timing of femtosecond x-ray synchrotron radiation pulses relative to a pump laser, where x-rays pulses of <100 fs duration are generated from the proposed LUX source based on a recirculating superconducting linac. We present a description of the timing signal generation and distribution systems to minimize timing jitter of the x-rays relative to the experimental lasers. C1 LBNL, Berkeley, CA USA. RP Corlett, JN (reprint author), LBNL, Berkeley, CA USA. RI Schoenlein, Robert/D-1301-2014 OI Schoenlein, Robert/0000-0002-6066-7566 NR 9 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2408 EP 2410 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600759 ER PT B AU Lumpkin, AH Yao, CY Yang, BX Toellner, T AF Lumpkin, AH Yao, CY Yang, BX Toellner, T BE Chew, J Lucas, P Webber, S TI Bunch purity evolution during APS storage ring top-up operations SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB During top-up operations of the Advanced Photon Source (APS) storage ring, a growth of the charge in the buckets on the trailing time side of the target rf buckets was observed in the bunch purity monitor data. This system is based on a photon counting technique that provides sub-ns time resolution with a dynamic range of greater than 10(6). The satellite bucket growth was related to the number of linac bunches being injected into the particle accumulator ring (PAR) and the adjustment of the 12(th) harmonic rf cavity phase. Besides measuring this growth in the +3,+l buckets relative to the 22 singlets targeted during top-up, we also report a special configuration and extended counting period that detected charge at the 10(-9) level of the target bucket. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Lumpkin, AH (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 4 TC 2 Z9 2 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2411 EP 2413 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600760 ER PT B AU Lumpkin, AH Scarpine, V AF Lumpkin, AH Scarpine, V BE Chew, J Lucas, P Webber, S TI The feasibility of OTR imaging of high-intensity proton beams at FNAL SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID TRANSITION RADIATION AB The Fermi National Accelerator Laboratory (FNAL) is currently pursuing a number of projects where either beam luminosity for the Tevatron collider (Run 11) or proton intensity for neutrino experiments requires careful tracking of beam properties throughout the facility or before a target. The feasibility of using optical transition radiation (OTR) imaging for the proton (or antiproton) beam sizes in transport lines between the rings of the facility has recently been evaluated. Based on comparisons to electron beam results at the Advanced Photon Source (APS) linac and proton results at CERN, the potential of OTR imaging at FNAL looks very encouraging. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Lumpkin, AH (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2414 EP 2416 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600761 ER PT B AU Lumpkin, AH Berg, WJ Borland, M Lewellen, J AF Lumpkin, AH Berg, WJ Borland, M Lewellen, J BE Chew, J Lucas, P Webber, S TI Recent characterizations of electron beams from the APS linac SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Advanced Photon Source (APS) facility includes an S-band linear accelerator (linac) that normally provides beam for the injection system of the 7-GeV storage ring. This beam is usually generated by one of two rf thermionic guns or the rf photocathode (PC) gun under special circumstances. When the beams are riot required for injection, we may characterize them at a station located at the end of the linac. At this station we have begun a retrofit and upgrade of the optics on the diagnostics table that is outside of the linac enclosures. For beam transverse profiling studies, a CCD camera was used to image the beam spot at the YAG:Ce screen or the optical transition radiation (OTR) screen. In using the quadrupole field scanning technique we demonstrate that the YAG:Ce saturation effect is present under these conditions so that OTR imaging is needed for PC gun beam. A Hamamatsu C5680 streak camera with OTR and a zero-phasing rf technique with an electron spectrometer were used for bunch length measurements of beam from a newly-installed rf thermionic gun. These results will also be presented. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Lumpkin, AH (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2417 EP 2419 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600762 ER PT B AU Lumpkin, AH Berg, WJ Borland, M Lewellen, JW Sereno, NS AF Lumpkin, AH Berg, WJ Borland, M Lewellen, JW Sereno, NS BE Chew, J Lucas, P Webber, S TI Initial CTR-based bunch length measurements of linac beams following the APS bunch compressor SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID COHERENT TRANSITION RADIATION AB The interest in generation and characterization of ultrabright electron beams for experiments at the Advanced Photon Source (APS) resulted in the installation of a four-dipole chicane bunch compressor within the linac. Both rf thermionic guns and an rf photocathode (PC) gun can be used to generate the electron beams with ps-regime bunch lengths. The bunch compressor can then be used to produce sub-ps bunches. In support of this initiative, a coherent transition radiation (CTR) bunch length monitor based on a far-infrared (FIR) Michelson interferometer was also installed at a location just downstream of the compressor. It used a room-temperature Golay cell as the FIR detector. Processing of the autocorrelation data indicated that structures shorter than 500 fs were being generated. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Lumpkin, AH (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2420 EP 2422 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600763 ER PT B AU Lumpkin, AH Yang, BX Yao, CY Emery, L AF Lumpkin, AH Yang, BX Yao, CY Emery, L BE Chew, J Lucas, P Webber, S TI X-ray imaging of the APS storage ring beam stability effects: From the alaskan earthquake to undulator field changes SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Advanced Photon Source (APS) 7-GeV storage ring serves as a national x-ray synchrotron radiation user facility. The stability and beam quality of the electron beam, and hence the photon beams, are monitored continuously by an array of diagnostics. In particular, x-ray imaging techniques are employed in the diagnostics sector of the ring to characterize beam position, size, and emittance. The x-ray synchrotron radiation (XSR) emitted by the electrons as they pass through the field of a dipole magnet is imaged by a pinhole camera. The images are processed by a Datacube MV200 video digitizer, and the results are provided through the EPICS platform. We have detected the effects on the beam ranging from the arrival of shock waves from the Alaskan earthquake of November 3, 2002 to the variation of the undulator fields by the users during their scans. In the latter case, the beam size effects were observed at the submicron level. Examples of beam centroid and size effects will be presented including some due to longitudinal instabilities at elevated stored beam currents. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Lumpkin, AH (reprint author), Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2423 EP 2425 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600764 ER PT B AU Sharamentov, SI Clifft, BE Ostrotumov, PN Pardo, RC Zinkann, GP AF Sharamentov, SI Clifft, BE Ostrotumov, PN Pardo, RC Zinkann, GP BE Chew, J Lucas, P Webber, S TI Superconducting resonator as beam-induced signal pickup SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The first demonstration of a superconducting resonator (SCR), installed for beam acceleration, to detect the arrival time of a beam bunch is described. The detecting resonator is operated at very low field level, comparable to the field induced by the beam pulse traversing the cavity so as to maintain an acceptable response characteristic for this high-Q device. Due to this, the RF field in an SCR is always a superposition of a "pure" (or reference) RF and the beam-induced signal. A new method of circular phase rotation (CPR), allowing extraction of the beam phase information from the composite RF field was developed. Arrival time phase determination with CPR is better than one degree for a beam current of 100 nA. The electronics design is described and example data are presented. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Sharamentov, SI (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2426 EP 2428 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600765 ER PT B AU Power, J Day, L Plum, M Stettler, M AF Power, J Day, L Plum, M Stettler, M BE Chew, J Lucas, P Webber, S TI Beam position monitor systems for the SNS linac SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The 402.5- and 805-MHz beam position and phase monitors for the Spallation Neutron Source linac are based on standard PC technology. The SNS beam is to be injected into a storage ring with a 1-MHz circulation frequency requiring 650-ns-long minipulses. The injection cycle takes 1 ms and the machine can run at rates up to a 60 Hz. The rf input signals are down converted to 50 MHz and sampled at 40 MHz with 14-bit ADCs to produce I and Q data streams. A custom PCI module has been designed to accept modular digital front end (DFE) and analog front end (AFE) circuit cards. This hardware is installed in a standard rack-mounted IU computer chassis running Windows(R) 2000, LabVIEW(R) and custom DLL software. The system continuously self-calibrates by generating 300-ns long rf pulses which are switched between the AFE inputs and the cables going to the BPM pickups. This provides a TDR-like calibration of the entire system. The system is designed to provide a position and phase resolution of 0.1% of the beam pipe aperture and 0.1 degrees RMS respectively over a 50 mus period. The design of the system is described as well as the initial performance measuring beam during the commissioning of the SNS MEBT. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Power, J (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 1 TC 3 Z9 4 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2429 EP 2431 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600766 ER PT B AU Power, JG AF Power, JG BE Chew, J Lucas, P Webber, S TI Slit scattering effects in a well aligned pepper pot SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A pepper pot is a device used to measure a medium energy (< 20 MeV) electron beam's transverse emittance by sampling its transverse phase space. This is accomplished by blocking most of the incident electron beam, while allowing small 'beamlets' to pass through openings in a mask. The accuracy of the transverse emittance measured by a pepper pot is limited by several factors including, electrons leaking through the solid region of the mask, the imaging system resolution and dynamic range, scattering, etc. While the noise contributions from the prior quantities can be easily estimated, scattering effects have previously been neglected due to the difficulty in estimating the effect. In this paper, EGS4 simulations are presented to determine the affect of scattering on emittance measurements for an 8 MeV electron beam. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Power, JG (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2432 EP 2434 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600767 ER PT B AU Sereno, NS Lenkszus, F Lill, RM AF Sereno, NS Lenkszus, F Lill, RM BE Chew, J Lucas, P Webber, S TI Advanced photon source booster synchrotron beam position monitor upgrade and applications SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Advanced Photon Source operates in top-up mode, which adds charge to the storage ring every two minutes to maintain the current at 102 +/- 1.0 mA. This requires the booster synchrotron to operate efficiently and reliably. The booster BPM system was upgraded to overcome a severe performance limitation due to operation of the receiver at the low end of its input power range. The upgrade provided a 25-dB improvement in overall system gain. This improved dynamic range and resolution, and reduced other systematic errors. The booster BPMs have been used in studies including measurements of ring circumference, synchrotron and betatron tune, and orbit correction. Software feedback corrections of the energy and rf phase errors at injection have been implemented for routine operations using the BPM beam history/DSP-based synchrotron tune measurement. Transverse injection feedback is presently being commissioned. The latest experimental results using the upgraded BPMs will be presented. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Sereno, NS (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2435 EP 2437 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600768 ER PT B AU Yao, CY Harkay, K Emery, L AF Yao, CY Harkay, K Emery, L BE Chew, J Lucas, P Webber, S TI Tune system applications at the APS SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Advanced Photon Source (APS) storage ring is a third-generation X-ray synchrotron radiation user facility. The storage ring tune measurement system consists of signal pickup and beam excitation drive striplines, a network analyzer, and a vector spectrum analyzer. The system has been used for daily tune tracking, beta-function measurement, chromaticity measurement, lattice correction, magnet power supply stability analysis, machine coupling impedance, and observation of beam instabilities. Several software applications were developed to automate the instrument control and data collection processes. We present the current configuration of the tune measurement system, the software tools, and their application at the APS. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Yao, CY (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2438 EP 2440 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600769 ER PT B AU Brown, KA Ahrens, L Severino, F Smith, K Wilinski, M AF Brown, KA Ahrens, L Severino, F Smith, K Wilinski, M BE Chew, J Lucas, P Webber, S TI AGS Booster beam position, tune, and longitudinal profile data acquisition system SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In this paper we will describe a data acquisition system designed and developed for the AGS Booster. The system was motivated by the need to get high quality beam diagnostics from the AGS Booster. This was accomplished by locating the electronics and digital data acquisition close to the Booster ring, to minimize loss of bandwidth in the original signals. In addition we had to develop the system rapidly and at a low cost. The system consists of a Lecroy digital oscilloscope which is interfaced through a National Instruments LabView (TM) server application, developed for this project. This allows multiple client applications to time share the scope without interfering with each other. We will present a description of the system design along with example clients that we have implemented. C1 BNL, C AD Dept, Upton, NY USA. RP Brown, KA (reprint author), BNL, C AD Dept, Upton, NY USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2441 EP 2443 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600770 ER PT B AU Cameron, P Brodowski, J Cerniglia, P Connolly, R Cupolo, J Dawson, C Degen, C DellaPenna, A Gassner, D Gonzalez, R Grau, M Gullotta, J Hoff, L Huhn, A Kesselman, M Liaw, C Mead, J Sikora, R Smith, G Vetter, K Wilinski, M Assadi, S Blokland, W Diebele, C Purcell, D Shea, T Plum, M Witkover, R AF Cameron, P Brodowski, J Cerniglia, P Connolly, R Cupolo, J Dawson, C Degen, C DellaPenna, A Gassner, D Gonzalez, R Grau, M Gullotta, J Hoff, L Huhn, A Kesselman, M Liaw, C Mead, J Sikora, R Smith, G Vetter, K Wilinski, M Assadi, S Blokland, W Diebele, C Purcell, D Shea, T Plum, M Witkover, R BE Chew, J Lucas, P Webber, S TI Spallation neutron source ring diagnostics SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Brookhaven is providing the Ring and Transfer Lines Beam Diagnostics for the Spallation Neutron Source (SNS), to be installed at Oak Ridge National Laboratory. The customary diagnostics that will be present include Beam Position Monitors (BPM), Ionization Profile Monitors (IPM), Beam Loss Monitors (BLM), Beam Current Monitors (BCM), Coherent Tune Measurement, and Wire Scanners. An overview of these systems is presented, along with brief discussions of SNS-specific problems that must be addressed, including unprecedented beam power, large dynamic range, a stringent loss budget, space charge, beam halo, and electron cloud. We also present an overview of systems more specifically tailored to address these problems, including Beam-in-Gap measurement and cleaning, two types of incoherent tune measurement, halo monitor, and video monitors for stripping foils and the electron catcher. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Cameron, P (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 14 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2444 EP 2446 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600771 ER PT B AU Gassner, D Cameron, P Mi, C Witkover, R AF Gassner, D Cameron, P Mi, C Witkover, R BE Chew, J Lucas, P Webber, S TI Spallation Neutron Source beam loss monitor system SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Spallation Neutron Source (SNS) [1] being built at Oak Ridge National Laboratory (ORNL) is designed to deliver 1.5 x 10(14) protons at 1.0 GeV in one bunch at 60 Hz to a liquid mercury target. To achieve this without excessive activation, an uncontrolled loss criteria of 1 part in 104 (similar to1 W/m) has been specified. Measured losses will provide machine tuning data, a beam abort trigger, and logging of loss history. The design of the distributed loss monitor system utilizing argon-filled ionization chambers and photomultipliers will be presented, as well as data from tests with beam. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Gassner, D (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2447 EP 2449 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600772 ER PT B AU Witkover, RL Gassner, D AF Witkover, RL Gassner, D BE Chew, J Lucas, P Webber, S TI Design and testing of the new ion chamber loss monitor for SNS SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB An ion chamber beam loss monitor has been designed for the Spallation Neutron Source (SNS). The new detector overcomes concerns with the original design about slow ion collection times and low collection efficiency at high loss rates. Prototypes have been built and tested with static sources and pulsed beams. Commercially made pre-production units have been fabricated and laboratory tested. Details of the design and test results will be presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Witkover, RL (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2450 EP 2452 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600773 ER PT B AU Kesselman, M Dawson, C Smith, G AF Kesselman, M Dawson, C Smith, G BE Chew, J Lucas, P Webber, S TI Beam current monitor calibrator for the spallation neutron source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Beam Current Monitor (BCM) system for the Spallation Neutron Source (SNS) to be installed at Oak Ridge National Laboratory (ORNL) requires an on-line calibrator to assure the system is appropriately scaling current. The calibration system must be able to handle the current range expected in the MEBT, Linac, HEBT, Ring and RTBT. This covers a dynamic range of 35ma to 50 amps. A 10-turn calibration winding has been included in all current transformers. This calibrator must provide adequate flexibility to assure the current transformers are not damaged by failures in the calibrator drive amplifier, and provide better than 1% accuracy with a capability to provide calibrated currents covering the dynamic range. This paper will address the design considerations and resulting design of a suitable calibrator for this system. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kesselman, M (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2453 EP 2454 PG 2 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600774 ER PT B AU Loos, H Doyuran, A Murphy, JB Rose, J Shaftan, T Sheehy, B Shen, Y Skaritka, J Wang, XJ Wu, Z Yu, LH AF Loos, H Doyuran, A Murphy, JB Rose, J Shaftan, T Sheehy, B Shen, Y Skaritka, J Wang, XJ Wu, Z Yu, LH BE Chew, J Lucas, P Webber, S TI Electro-optic longitudinal electron beam diagnostic at SDL SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The linac at the NSLS Source Development Lab (SDL) provides a high brightness electron beam for the DUV-FEL project with subpicosecond bunch length and several hundred Amperes peak current by means of a photoinjector and a magnetic bunch compressor. Previous diagnostics of the longitudinal bunch dynamics relied on the rf zero-phasing method and measurements of CTR spectra. In order to have a fast and non-intercepting longitudinal diagnostic available, the electro-optic measurement technique has been implemented with its major component, a synchronized 100 fs Ti: Sapphire laser coaligned with the electron beam, already in place as a seed for the FEL. The theoretical temporal resolution for a 100 um thick ZnTe crystal is limited to about 200 fs and the signal contrast to more than 1%. We present preliminary results of multi-shot scanning measurements and the single-shot diagnostics of the bunch shape as well as its application as a rf-laser jitter monitor. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Loos, H (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. RI Shaftan, Timur/A-8443-2009; OI Loos, Henrik/0000-0001-5085-0562 NR 5 TC 3 Z9 3 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2455 EP 2457 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600775 ER PT B AU Plum, MA Christensen, W Meyer, RE Rose, CR AF Plum, MA Christensen, W Meyer, RE Rose, CR BE Chew, J Lucas, P Webber, S TI The SNS linac wire scanner system SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The linac wire scanner system for the Spallation Neutron Source (SNS) at Oak Ridge, TN, calls for 5 units in the medium energy beam transport (MEBT), 5 in the drift tube linac (DTL), 8 in the coupled cavity linac (CCL), and 13 in the high energy beam transport (HEBT). The actuators are a custom design fabricated by Huntington Mechanical Laboratories. Four different strokes are required to cover the above areas. The electronics are designed and fabricated by Los Alamos National Laboratory (LANL). In this paper we will discuss the design of the actuators and the electronics, positioning accuracy tests of the actuators, and also show results from beam measurements taken during the MEBT commissioning at Oak Ridge National Laboratory. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Plum, MA (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2485 EP 2487 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600785 ER PT B AU Cheung, HWK Hahn, A Xiao, A AF Cheung, HWK Hahn, A Xiao, A BE Chew, J Lucas, P Webber, S TI Performance of a beam monitor in the Fermilab Tevatron using synchrotron light SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Synclite, the beam monitor in the Fermilab Tevatron using synchrotron light is described. The calibration, monitoring and performance of the system is discussed. Observation of some effects of long range beam-beam interactions seen in the beam monitor will be presented as well as a measurement of DC beam in the Tevatron. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Cheung, HWK (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2488 EP 2490 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600786 ER PT B AU Pordes, S Blokland, W Crisp, J Fellenz, B Flora, R Hahn, A Meyer, TS Tollestrup, A AF Pordes, S Blokland, W Crisp, J Fellenz, B Flora, R Hahn, A Meyer, TS Tollestrup, A BE Chew, J Lucas, P Webber, S TI Measurement of proton and anti-proton intensities in the Tevatron collider SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB This paper describes the techniques used to measure the intensities of the proton (p) and anti-proton (p) beams in the Tevatron collider. The systems provide simultaneous measurements of the intensity of the 36 proton and 36 anti-proton bunches and their longitudinal profiles. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Pordes, S (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 3 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2491 EP 2493 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600787 ER PT B AU Schappert, W Lorman, E Ross, M Scarpine, V Sebek, J Straumann, T AF Schappert, W Lorman, E Ross, M Scarpine, V Sebek, J Straumann, T BE Chew, J Lucas, P Webber, S TI Digital down conversion technology for Tevatron beam line tuner at FNAL SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Fermilab is presently in Run II collider operations and is developing instrumentation to improve luminosity. Improving the orbit matching between accelerator components using a Beam Line Tuner (BLT) can improve the luminosity. Digital Down Conversion (DDC) has been proposed as a method for making more accurate beam position measurements. Fermilab has implemented a BLT system using a DDC technique to measure orbit oscillations during injections from the Main Injector to the Tevatron. The output of a fast ADC is down-converted and filtered in software. The system measures the x and y positions, the intensity, and the time of arrival for each proton or antiproton bunch, on a turn-by-turn basis, during the first 1024 turns immediately following injection. We present results showing position, intensity, and time of arrival for both injected and coasting beam. Initial results indicate a position resolution of similar to20 to 40 microns and a phase resolution of similar to25 ps. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Schappert, W (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2494 EP 2496 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600788 ER PT B AU Tollestrup, AV Binkley, ME Hanna, BM Lebedev, V Moore, R Shiltsev, V Tesarek, R Vidal, R AF Tollestrup, AV Binkley, ME Hanna, BM Lebedev, V Moore, R Shiltsev, V Tesarek, R Vidal, R BE Chew, J Lucas, P Webber, S TI Measurements of the longitudinal and transverse beam loss at the Tevatron SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Measurements of the transverse and longitudinal beam losses during a Tevatron store will be presented. The measurements utilize scintillation counters to monitor the nuclear interactions of the 1 TeV halo particles with a scraper that is located near the beam. If the particles are in time with the primary bunches, they are assumed to come from transverse perturbations inducing large betatron oscillations. Particles lost longitudinally drift around the ring due to synchrotron radiation and become asynchronous with respect to the bunches. A pulsed electron lens is then used to induce large betatron oscillations that extract these particles onto the scraper. The resulting nuclear interactions in the scraper are recorded by a gated scintillating counter system. The counting rates from the two channels provide an online measurement of the two types of beam loss. Known beam loss due to interactions at the IP and to nuclear collisions in the residual gas can be subtracted which then exposes the underlying losses from longitudinal and transverse instabilities. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Tollestrup, AV (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2497 EP 2499 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600789 ER PT B AU Gilpatrick, JD Barr, D Martinez, D O'Hara, JF Shurter, RB Stettler, M AF Gilpatrick, JD Barr, D Martinez, D O'Hara, JF Shurter, RB Stettler, M BE Chew, J Lucas, P Webber, S TI Beam position measurements at Los Alamos: Isotope Production Facility and Switchyard Kicker Upgrade SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Los Alamos Neutron Science Center (LANSCE) is installing two beam lines to both improve operational tuning and provide new capabilities. The Isotope Production Facility (IPF) will provide isotopes for medical purposes by using the H+ beam spur at 100 MeV and the Switchyard Kicker Upgrade (SYK) will allow the LANSCE 800-MeV H- beam to be rapidly switched between various beam lines within the facility. The beam position instrumentation for both of these beam lines uses a micro-stripline beam position monitor (BPM) with a 50-mm or 75-mm radius. The cable plant is unique in that it unambiguously verifies the operation of the complete position instrumentation. The processing electronics use a log ratio technique with error correction such that it has a dynamic range of -12 dBm to -85 dBm with errors less than 0.15 dB within this range. This paper will describe the primary components of these measurement systems and provide initial data of their operation. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Gilpatrick, JD (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2512 EP 2514 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600794 ER PT B AU Merl, R Gallegos, F Pillai, C Shelley, F Sanchez, BJ Steck, A AF Merl, R Gallegos, F Pillai, C Shelley, F Sanchez, BJ Steck, A BE Chew, J Lucas, P Webber, S TI A multiwire proportional chamber system for monitoring low momentum beam in accelerators SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A diagnostic is being developed at the Los Alamos Neutron Science Center (LANSCE) for the purpose of identifying low momentum beam tails in the linear accelerator. These tails must be eliminated in order to maintain the transverse and longitudinal beam size. Instead of the currently used phosphor camera system, this instrument consists of a Multi Wire Proportional Chamber (MWPC) front end coupled to an EPICS compliant VME-based electronics package. Low momentum tails are detected with a resolution of 5 mm in the MWPC at a high dispersion point near a bending magnet. While phosphor is typically not sensitive in the nano amp range, the MWPC is sensitive down to about a pico amp. The electronics package will process the signals from each of the MWPC wires to generate an array of beam currents at each of the lower energies. The electronics will have a wideband analog front end, active anti alias filter, and high-speed analog to digital converter for each wire. Data from multiple wires will be processed with an embedded digital signal processor and results placed in a set of VME registers. An EPICS application will assemble the data from these VME registers into a display of beam current vs. beam energy (momentum) in the LANSCE control room. This display will update at least once per second, but will be a representation of the real time signal processing results from the electronics package. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Merl, R (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2515 EP 2517 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600795 ER PT B AU Merl, R Gallegos, F Pillai, C Shelley, F AF Merl, R Gallegos, F Pillai, C Shelley, F BE Chew, J Lucas, P Webber, S TI High speed EPICS data acquisition and processing on one VME board SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A custom VME board is being designed at the Los Alamos Neutron Science Center (LANSCE) for highspeed signal acquisition and processing. While it is desirable to design around the EPICS / VME platform, it can be difficult to process high-speed signals with long record lengths. The relatively slow data path between the IOC and the general- purpose computer makes real time computations impossible. Commercial VME processor boards can be used, but the data must still flow over the VME backplane in lieu of other traffic. This custom board is designed to overcome this problem by acquiring and processing the signal in one place, with the processed result presented at the VME interface instead of the raw data. The board consists of multiple front-end signal conditioners / digitizer cards plugged into the foundation 6U VME board with an embedded digital signal processor (DSP). The DSP is programmed in C to process the raw signal any way the user wants before writing results into a VME register map. The present front-end conditioner / digitizer cards are being designed with the LANSCE low momentum detector in mind, but other variations on this card could be developed. The architecture is flexible enough to deploy in many accelerator applications. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Merl, R (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2518 EP 2520 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600796 ER PT B AU Browman, A Borden, M Fitzgerald, D Macek, R McCrady, R Spickermann, T Zaugg, T AF Browman, A Borden, M Fitzgerald, D Macek, R McCrady, R Spickermann, T Zaugg, T BE Chew, J Lucas, P Webber, S TI Halo measurements of the extracted beam at the Los Alamos Proton Storage Ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The spatial beam density distribution beyond 2.5 to 3 standard deviations of the beam center is an important property for undertanding the relatively small fractional losses of high intensity beams at the Los Alamos Proton Storage Ring (PSR) and transport lines to the neutron production target. This part of the distribution (sometimes referred to as beam halo) is not well determined by the LANSCE-standard wire scanner system nor is it yet reliably predicted by the simulation codes. To significantly improve the experimental determination of the beam halo, an improved wire scanner has been developed, tested and installed in the extraction line. To enhance the signal-to-noise ratio, an amplifier consisting of a wide dynamic-range, integrating amplifier, sample-and-hold circuit, log amplifier and line driver is located near the beam line [1]. Offset errors at the input of the amplifiers are actively cancelled and timing gates are derived from a single input pulse. We will describe the prototype instrument, discuss our encouraging test results and report our experience with the instrument in the PSR extraction line. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Browman, A (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2521 EP 2523 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600797 ER PT B AU Bieniosek, FM Prost, L Ghiorso, W AF Bieniosek, FM Prost, L Ghiorso, W BE Chew, J Lucas, P Webber, S TI Beam imaging diagnostics for heavy ion beam fusion experiments SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We are developing techniques for imaging beams in heavy-ion beam fusion experiments in the HIF-VNL in 2 to 4 transverse dimensions. The beams in current experiments range in energy from 50 keV to 2 MeV, with beam current densities from <10 to 200 mA/cm(2), and pulse lengths of 4 to 20 mus. The beam energy will range up to 10 MeV in near-future beam experiments. The imaging techniques, based on kapton films and optical scintillators, complement and, in some cases, may replace mechanical slit scanners. The kapton film images represent a time-integrated image on the film exposed to the beam. The optical scintillator utilizes glass and ceramic scintillator material imaged by a fast, image-intensified CCD-based camera. We will discuss the techniques, results, and plans for implementation of the diagnostics on the beam experiments. C1 LBNL, Berkeley, CA 94720 USA. RP Bieniosek, FM (reprint author), LBNL, Berkeley, CA 94720 USA. NR 8 TC 3 Z9 3 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2524 EP 2526 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600798 ER PT B AU Sannibale, F Baum, D Kelez, N Scarvie, T Holldack, K AF Sannibale, F Baum, D Kelez, N Scarvie, T Holldack, K BE Chew, J Lucas, P Webber, S TI A second beam-diagnostic beamline for the advanced light source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A second bean-dine, BL 7.2, completely dedicated to beam diagnostics is being installed at the Advanced Light Source (ALS). The design has been optimized for the measurement of the momentum spread and emittance of the stored beam in combination with the existing diagnostic beamline, BL 3.1. A detailed analysis of the experimental error has allowed the definition of the system parameters. The obtained requirements found a good matching with a simple and reliable system based on the detection of X-ray synchrotron radiation (SR) through a pinhole system. The actual beamline, which also includes a port for visible and infrared SR as well as an X-ray beam position monitor (BPM), is mainly based on the design of two similar diagnostic beamlines at BESSY II. This approach allowed a significant saving in time, cost and engineering effort. The design criteria, including a summary of the experimental error analysis, as well as a brief description of the beamline are presented. C1 LBNL, Berkeley, CA 94720 USA. RP Sannibale, F (reprint author), LBNL, Berkeley, CA 94720 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2527 EP 2529 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600799 ER PT B AU Paul, AC Hawkins, S McCarrick, J Sullivan, J Watson, J Westenskow, G Eylon, S Fessenden, TJ Nexsen, W AF Paul, AC Hawkins, S McCarrick, J Sullivan, J Watson, J Westenskow, G Eylon, S Fessenden, TJ Nexsen, W BE Chew, J Lucas, P Webber, S TI DARHT-II energy analyzer SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A energy analyzer system is being built for the DARHT-II accelerator similar to the energy analyzer used on the Astron accelerator [1]. This system consists of a scattering wire, magnetic bend, and null signal detector. The wire thickness of 40 mil carbon and the scattering angle of 11 degrees is chosen for good signal to noise ratio. The dipole bend angle is 60 degrees, with a 30 cm radius of curvature. The image-plane focal distance is chosen for the required energy resolution. The energy resolution and acceptance are 0.1% and +/-5% with a time response of 10 nsec. The wire must survive the 2usec RA, 18.4 MeV DARHT-II beam. The MCNP code [21 was used to study the wire scattered properties. The scattered beam fills the available 1x2 cm dipole aperture. The dispersion normal to the beam direction is 0.43 cm/%. The detector is a PIN diode array which determines the beam position on the chip. This array consists of 40 2.5x0.1x0.25 mm bins with a gain in excess of 10000. The system will be installed in the space between the debris blocker and the cruncher solenoid up-stream from the shuttle dump [3]. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Paul, AC (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2533 EP 2535 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600801 ER PT B AU Ross, M Frisch, J Hendrickson, L McCormick, D Vogel, V Hayano, H Urakawa, J AF Ross, M Frisch, J Hendrickson, L McCormick, D Vogel, V Hayano, H Urakawa, J BE Chew, J Lucas, P Webber, S TI Very high resolution RF cavity BPM SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Linear collider (LC) interaction region beam sizes and component position stability requirements are expected to be a few nanometers[1]. It is important to show that the related tolerances can be achieved, with an electron beam if possible. Using recently developed component stabilization technology, very high-resolution beam position monitors (BPM's), and the ultra-low emittance beam at the KEK ATF, we plan to demonstrate the required stabilization. Our first step is to develop high-resolution RF cavity beam position monitors, using either C or X band frequencies. A C-band cavity BPM with a resolution of 25 nm has been reported in tests at FFTB [2]. By correcting for the effects of non-axial trajectories and using both position and angle BPM movers, we expect to be able to demonstrate a resolution of 2 to 3 nm over a dynamic range of +/- 20 um. We report on the progress of the tests here. C1 SLAC, Menlo Pk, CA 94025 USA. RP Ross, M (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 2 TC 1 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2545 EP 2547 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600805 ER PT B AU Ross, M Frisch, J McCormick, D Hayano, H AF Ross, M Frisch, J McCormick, D Hayano, H BE Chew, J Lucas, P Webber, S TI RF cavity BPM's as beam angle and beam correlation monitors SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB It has been shown that high performance cavity BPM's are capable of accurate beam trajectory angle and beam 'tilt', (x-z or y-z correlation) measurements [1], [2]. Such a device will be very useful for the optimization of a variety of beamlines, such as high current linacs, bunch rotators and storage rings. The signal from a non-axial trajectory or a tilted beam is in quadrature to that observed from a simple displacement of a very short bunch. Using in-phase / quadrature-phase (I/Q) demodulation of the cavity BPM signal, it is possible to separate position and angle/tilt. In this paper, we present results of beam angle and tilt monitor tests carried out in the KEK Accelerator Test Facility (ATF) extraction line. C1 SLAC, Menlo Pk, CA 94025 USA. RP Ross, M (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 4 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2548 EP 2550 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600806 ER PT B AU Chevtsov, P Freyberger, A Hicks, R Denard, JC AF Chevtsov, P Freyberger, A Hicks, R Denard, JC BE Chew, J Lucas, P Webber, S TI Synchrotron light interferometer at Jefferson Lab SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A synchrotron light interferometer has been built at Jefferson Lab in order to measure small beam sizes below the diffraction limit. The device is non-invasive and can monitor the profile of a few microampere electron beam. It follows the design pioneered by T. Mitsuhashi [1] and is a valuable instrument for the CEBAF accelerator. The structure of the interferometer, the experience gained during its installation, and first beam measurement results are presented. Future applications of this device include precise energy spread monitoring (similar to10(-5)) which is required by some Hall A nuclear physics experiments. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Chevtsov, P (reprint author), Jefferson Lab, Newport News, VA 23606 USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2560 EP 2562 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600810 ER PT B AU Dickson, R AF Dickson, R BE Chew, J Lucas, P Webber, S TI Development of a BPM lock-in diagnostic system SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A system has been developed for the acquisition and analysis of high rate, time coherent BPM data across the Jefferson Lab's Continuous Electron Beam Accelerator Facility (CEBAF). This system will allow the acquisition of Beam Position Monitor (BPM) position and intensity information at a rate in excess 7 KHz for approximately 200 BPMs in a time synchronous manner. By inducing minute sinusoidal transverse beam motion in the CEBAF injector, with known phase relative to the synchronized BPM acquisition, it is possible to derive several types of useful information. Analysis of the BPM intensity data, which is proportional to beam current, by beating the signal with an in-phase sinusoidal representation of the transverse kick can localize beam scraping to a particular BPM. Similarly, real-time optics information may be deduced with an analysis of BPM position data. This paper will detail the frequency lock-in technique applied and present status. C1 Jefferson lab, Newport News, VA 23606 USA. RP Dickson, R (reprint author), Jefferson lab, Newport News, VA 23606 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2563 EP 2564 PG 2 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600811 ER PT B AU Freyberger, AP AF Freyberger, AP BE Chew, J Lucas, P Webber, S TI Large dynamic range beam profile measurements SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Large dynamic range (Peak/Noise > 10(5)) beam profile measurements are routinely performed in the Hall-B bean-dine at Jefferson Lab. These measurements are made with a 1 to 10nA electron beam current with energies between 1 to 6 GeV. The electron beam scatters off of a thin (25mum) W or Fe wire and the scattered particle/shower is detected via scintillation or Cerenkov light several meters downstream of the wire. This light is converted to an electrical pulse via photomultiplier tubes (PMT). The PMT readout and wire motion are controlled and synchronized by VME electronics. This report describes results on increasing the dynamic range by using multiple wires of varying diameters. Profile measurements with this large dynamic range can be of use for machines with very large beam currents (e.g. energy recovering linacs) where any fractional beam loss represents a significant amount of beam power[1, 2]. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Freyberger, AP (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2565 EP 2567 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600812 ER PT B AU Fedotov, AV Parzen, G AF Fedotov, AV Parzen, G BE Chew, J Lucas, P Webber, S TI Compensation of nonlinear resonances in the presence of space charge SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Imperfection non-linear resonances can lead to undesirable beam loss and thus limit the high-intensity operation. In the presence of space charge, beam response to such resonances is strongly influenced by collective beam dynamics. It is thus crucial to understand the effectiveness of the non-linear resonance compensation. We explore various procedures in the resonance correction and suggest some practical applications. Effectiveness of resonance correction for the high-intensity operation is discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fedotov, AV (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2589 EP 2591 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600820 ER PT B AU Fedotov, AV Hofmann, I Gluckstern, RL Okamoto, H AF Fedotov, AV Hofmann, I Gluckstern, RL Okamoto, H BE Chew, J Lucas, P Webber, S TI Application of envelope instability to high-intensity rings SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The space-charge limit is imposed by beam response to low-order machine resonances. Here, the coherent response of the beam to such resonances is discussed, including the parametric resonance of collective beam modes with the periodic lattice, also known as the "envelope instability", when the second-order beam modes are considered. The relation of this parametric resonance to the coherent resonance condition of an integer type is explained. Practical application of such resonant responses to both structural and imperfection driven harmonics is addressed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fedotov, AV (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2592 EP 2594 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600821 ER PT B AU Blaskiewicz, M Brown, K Glenn, J Raka, E Ryan, J AF Blaskiewicz, M Brown, K Glenn, J Raka, E Ryan, J BE Chew, J Lucas, P Webber, S TI Spill structure in intense beams SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Fixed target studies of small branching ratio decay processes require intense beams and smooth spills. Longitudinal structure arises through collective effects, well below the coasting beam stability threshold. These structures have been observed at the Brookhaven AGS and dependence on intensity and momentum spread measured. Measurements and amelioration techniques have been developed and will be described. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Blaskiewicz, M (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2595 EP 2597 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600822 ER PT B AU Eylon, S Henestroza, E Roy, PK Yu, SS AF Eylon, S Henestroza, E Roy, PK Yu, SS BE Chew, J Lucas, P Webber, S TI High brightness potassium ion gun for the HIF neutralized transport experiment (NTX) SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The NTX experiment at the Heavy Ion Fusion Virtual National Laboratory is exploring the performance of neutralized final focus systems for high perveance heavy ion beams. To focus a high intensity beam to a small spot requires a high brightness beam. In the NTX experiment, a potassium ion beam of up to 400 keV and 80 mA is generated in a Pierce type diode. At the diode exit, an aperture with variable size provides the capability to vary the beam perveance and to significantly reduce the beam emittance. We shall report on the gun characterization including current density profile, phase space distributions and the control of electrons generated by the beam scraping at the aperture. Comparison with particle simulations using the EGUN code will be presented. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94530 USA. RP Eylon, S (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94530 USA. NR 4 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2616 EP 2618 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600829 ER PT B AU Henestroza, E Bieniosek, FM Eylon, S Roy, PK Yu, SS AF Henestroza, E Bieniosek, FM Eylon, S Roy, PK Yu, SS BE Chew, J Lucas, P Webber, S TI Final focus system for high intensity beams SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The NTX experiment at the Heavy Ion Fusion Virtual National Laboratory is exploring the performance of neutralized final focus systems for high perveance heavy ion beams. The NTX final focus system produces a converging beam at the entrance to the neutralized drift section where it focuses to a small spot. The final focus lattice consists of four pulsed quadrupole magnets. The main issues are the control of emittance growth due to high order fields from magnetic multipoles and image fields. We will present experimental results from NTX on beam envelope and phase space distributions, and compare these results with particle simulations using the particle-in-cell code WARP. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Henestroza, E (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. NR 6 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2619 EP 2621 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600830 ER PT B AU Henestroza, E Yu, SS Eylon, S Roy, PK Anders, A Sharp, W Welch, D Rose, D AF Henestroza, E Yu, SS Eylon, S Roy, PK Anders, A Sharp, W Welch, D Rose, D BE Chew, J Lucas, P Webber, S TI Neutralized transport of high intensity beams SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The NTX experiment at the Heavy Ion Fusion Virtual National Laboratory is exploring the performance of neutralized final focus systems for high perveance heavy ion beams. A converging ion beam at the exit of the final focus magnetic system is injected into a neutralized drift section. The neutralization is provided by a metal arc source and an RF plasma source. Effects of a "plasma plug", where electrons are extracted from a localized plasma in the upstream end of the drift section, and are then dragged along by the ion potential, as well as the "volumetric plasma", where neutralization is provided by the plasma laid down along the ion path, are both studied and their relative effects on the beam spot size are compared. Comparisons with 3-D PIC code predictions will also be presented. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Henestroza, E (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RI Anders, Andre/B-8580-2009 OI Anders, Andre/0000-0002-5313-6505 NR 5 TC 2 Z9 2 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2622 EP 2624 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600831 ER PT B AU Roy, PK Eylon, S Hannink, R Henestroza, E Ludvig, J Shuman, D Yu, SS AF Roy, PK Eylon, S Hannink, R Henestroza, E Ludvig, J Shuman, D Yu, SS BE Chew, J Lucas, P Webber, S TI Non-intercepting diagnostic for the HIF neutralized transport experiment SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The NTX experiment at the Heavy Ion Fusion Virtual National Laboratory is exploring the performance of neutralized final focus systems for high perveance heavy ion beams. We are developing a non-destructive beam diagnostic system to characterize the ion beam during its operation. Ion beam space charge is sensed by measuring deflection of mono energetic electron passing transversely through the ion beam. In this diagnostic system an electron beam of a submillimeter size with 1-5 muA current and 5-8 kV energy will be injected perpendicularly through the ion beam. The position and intensity of the deflected e-beam would be registered on a scintillator for optical analysis to characterize the ion beam. An electron beam of negligible space charge will be deflected at an angle that depends on the charge density and energy distribution of the ion beam along its trajectory. The e-beam current and energy are chosen such that its trajectory will be significantly perturbed without perturbing the ion beam. We present a progress report on this diagnostic system including the characterization of the electron gun, the design of the c-beam transport system, and a study of the scintillator and its associate electronics and photonic components. C1 LBNL, Berkeley, CA 94720 USA. RP Roy, PK (reprint author), LBNL, 1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2625 EP 2627 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600832 ER PT B AU Bukh, B Lund, SM AF Bukh, B Lund, SM BE Chew, J Lucas, P Webber, S TI Analytical study of envelope modes for a fully depressed beam in solenoidal and quadrupole periodic transport channels SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We present an analysis of envelope perturbations evolving in the limit of a fully space-charge depressed (zero emittance) beam in periodic, thin-lens focusing channels. Both periodic solenoidal and FODO quadrupole focusing channels are analyzed. The phase advance and growth rate of normal mode perturbations are analytically calculated as a function of the undepressed particle phase advance to characterize the evolution of envelope perturbations. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Bukh, B (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RI Bukh, Boris/B-8146-2017 OI Bukh, Boris/0000-0003-4559-8336 NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2631 EP 2633 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600834 ER PT B AU Lund, SM Bukh, B AF Lund, SM Bukh, B BE Chew, J Lucas, P Webber, S TI Influence of conducting plate boundary conditions on the RMS envelope equations describing intense ion beam transport SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In typical diagnostic applications, intense ion beams are intercepted by a conducting plate with slits to measure beam phase-space projections. This results in the transverse space-charge field near the plate being shorted out, rendering simple envelope models with constant space-charge strength inaccurate. Here we develop a simple corrected envelope model based on analytical calculations to account for this effect on the space-charge term of the envelope equations, enabling more accurate comparisons with experiment. Results are verified with 3D self-consistent PIC simulations. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Lund, SM (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RI Bukh, Boris/B-8146-2017 OI Bukh, Boris/0000-0003-4559-8336 NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2634 EP 2636 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600835 ER PT B AU Sharp, WM Grote, DP Callahan, DA Tabak, M Henestroza, E Yu, SS Peterson, PF Welch, DR Rose, DV AF Sharp, WM Grote, DP Callahan, DA Tabak, M Henestroza, E Yu, SS Peterson, PF Welch, DR Rose, DV BE Chew, J Lucas, P Webber, S TI Realistic modeling of chamber transport for heavy-ion fusion SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID INERTIAL CONFINEMENT FUSION; TARGET AB Transport of intense heavy-ion beams to an inertial-fusion target after final focus is simulated here using a realistic computer model. It is found that passing the beam through a rarefied plasma layer before it enters; the fusion chamber can largely neutralize the beam space charge and lead to a usable focal spot for a range of ion species and input conditions. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Sharp, WM (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2637 EP 2639 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600836 ER PT B AU Jeon, DO Stovall, J AF Jeon, DO Stovall, J BE Chew, J Lucas, P Webber, S TI SNS Linac commissioning - Transverse matching SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Spallation Neutron Source Linac consists of a few distinct sections which require careful transverse matching. Robust techniques for transversely matching various sections of the SNS Linac have been identified and will be presented. These techniques do not require us any knowledge of machine optics, and are robust against up to 20% measurement uncertainties, beam mismatch, etc. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP Jeon, DO (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. NR 5 TC 4 Z9 4 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2652 EP 2654 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600841 ER PT B AU Gilson, EP Davidson, RC Efthimion, PC Majeski, R Qin, H AF Gilson, EP Davidson, RC Efthimion, PC Majeski, R Qin, H BE Chew, J Lucas, P Webber, S TI Recent results from the Paul Trap Simulator Experiment SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Paul Trap Simulator Experiment (PTSX) is a compact laboratory facility whose purpose is to simulate the nonlinear dynamics of intense charged particle beam propagation over large distances through an alternating-gradient transport system. The simulation is possible because the quadrupole electric fields of the cylindrical Paul trap exert radial forces on the charged particles that are analogous to the radial forces that a periodic focusing quadrupole magnetic field exert on the beam particles in the beam frame. Initial experiments clearly demonstrate the loss of confinement when the vacuum phase advance sigma(v) of the system exceeds 90degrees. Recent experiments show that PTSX is able to successfully trap plasmas of moderate intensity for thousands of equivalent lattice periods. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Gilson, EP (reprint author), Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. NR 6 TC 12 Z9 12 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2655 EP 2657 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600842 ER PT B AU Qin, H Davidson, RC Barnard, JJ Lee, EP AF Qin, H Davidson, RC Barnard, JJ Lee, EP BE Chew, J Lucas, P Webber, S TI Drift compression and final focus of intense heavy ion beam SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The longitudinal and transverse dynamics of a heavy ion fusion beam during the drift compression and final focus phase is studied. A lattice design with four time-dependent magnets is described that focuses the entire beam pulse onto a single focal point with the same spot size. C1 Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Qin, H (reprint author), Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. NR 3 TC 4 Z9 4 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2658 EP 2660 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600843 ER PT B AU Efthimion, PC Gilson, E Grisham, L Davidson, RC Yu, SS Logan, BG AF Efthimion, PC Gilson, E Grisham, L Davidson, RC Yu, SS Logan, BG BE Chew, J Lucas, P Webber, S TI RF plasma source for heavy ion beam charge neutralization SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Highly ionized plasmas are being used as a medium for charge neutralizing heavy ion beams in order to focus the ion beam to a small spot size. A radio frequency (RF) plasma source has been built at the Princeton Plasma Physics Laboratory (PPPL) in support of the joint Neutralized Transport Experiment (NTX) at the Lawrence Berkeley National Laboratory (LBNL) to study ion beam neutralization with plasma. The goal is to operate the source at pressures similar to 10(-5) Torr at full ionization. The initial operation of the source has been at pressures of 10(4) - 10(-1) Torr and electron densities in the range of 10(8) - 10(11) cm(-3). Recently, pulsed operation of the source has enabled operation at pressures in the 10(-6) Torr range with densities of 10(11) cm(-3). Near 100% ionization has been achieved. The source has been integrated with the NTX facility and experiments have begun. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Efthimion, PC (reprint author), Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2661 EP 2663 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600844 ER PT B AU Ivanov, V Adolphsen, C Folwell, N Ge, L Guetz, A Li, Z Ng, CK Wang, JW Wolf, M Ko, K Schussmann, G Weiner, M AF Ivanov, V Adolphsen, C Folwell, N Ge, L Guetz, A Li, Z Ng, CK Wang, JW Wolf, M Ko, K Schussmann, G Weiner, M BE Chew, J Lucas, P Webber, S TI Simulating accelerator structure operation at high power SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The important limiting factors in high-gradient accelerator structure operation are dark current capture, RF breakdown and electron multipacting. These processes involve both primary and secondary electron field emission and produce plasma and X-rays. To better understand these phenomena, we have simulated dark current generation and transport in a linac structure and a square-bend waveguide, both high power tested at SLAC. For these simulations, we use the parallel, time-domain, unstructured-grid code Tau3P and the particle tracking module Track3P. In this paper, we present numerical results and their comparison with measurements on energy spectrum of electrons transmitted in a 30-cell structure and of X-rays emitted from the square-bend waveguide. C1 SLAC, Menlo Pk, CA 94025 USA. RP Ivanov, V (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2664 EP 2666 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600845 ER PT B AU Limborg, C Gierman, S Power, J AF Limborg, C Gierman, S Power, J BE Chew, J Lucas, P Webber, S TI A modified quadscan technique for emittance measurement of space charge dominated beams SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The quad-scan technique is one of the most commonly used methods for measuring emittances in photo-injectors at medium range energy in which the beam is not primarily space charge dominated. The space charge can nevertheless contribute strongly to the beam size evolution along the drift from the scanning quadrupole to the measurement screen. To take the space charge into account, we fit the beam sizes while solving the envelope equation for each quadrupole value. This algorithm is first applied to round beams and then extended to asymmetric beams. The benchmarking of this solver with the envelope equation tracker with PARMELA simulations is presented. The quadrupole scan algorithm including space charge correction for the round and not round beams is presented. C1 SLAC, Menlo Pk, CA USA. RP Limborg, C (reprint author), SLAC, MS 69,2575 Sand Hill Rd, Menlo Pk, CA USA. NR 3 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2667 EP 2669 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600846 ER PT B AU Decker, G Sun, X AF Decker, G Sun, X BE Chew, J Lucas, P Webber, S TI Observation of coherent microwave transition radiation in the APS linac SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The APS injector includes a conventional S-band linear accelerator with three separate electron sources. Two electron guns are used as primary and secondary sources for injection into the APS 7-GeV storage ring, while a separate laser photocathode gun is available for free-electron laser (FEL) research. We report here the results of the dependence of 30-GHz coherent microwave transition radiation on electron bunch length. Sensitivity to pulses as short as 200 to 300 femtoseconds has been demonstrated. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Decker, G (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2688 EP 2690 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600853 ER PT B AU Drees, A Michnoff, R Wilinski, M Montag, C Cameron, P AF Drees, A Michnoff, R Wilinski, M Montag, C Cameron, P BE Chew, J Lucas, P Webber, S TI RHIC transverse injection damping SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Since the beginning of the currently ongoing RHIC run a transverse injection damper is available. The damper is based on a fast kicker module in combination with a HV power supply and fast HV switches. This system can damp one injected bunch at the time with a given kick amplitude ("bang-bang mode") for several hundred turns. This report gives an overview of the injection damping system and summarizes its performance and our experience during the first months of usage. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Drees, A (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2691 EP 2693 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600854 ER PT B AU Gullotta, J Gassner, D Trbojevic, D Zhang, S AF Gullotta, J Gassner, D Trbojevic, D Zhang, S BE Chew, J Lucas, P Webber, S TI RHIC electron detector signal processing design SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The RHIC gold beam intensity is presently limited by pressure rise at some warm sections, and the main cause is thought to be the electron cloud. For the FY2003 RHIC run, a system has been installed to characterize the electron cloud, if it exists. The system is comprised of electron detectors, high voltage bias supplies, signal amplifiers, and data acquisition electronics, all integrated into the Controls system. The 11 detectors are grouped into four locations, one in an interaction region and three in single beam straight sections. This paper describes the signal processing design of the detector system, and includes data collected from the FY2003 run. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Gullotta, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2694 EP 2696 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600855 ER PT B AU Satogata, T Cameron, P Cerniglia, P Cupolo, J Dawson, C Degen, C Mead, J Vetter, K AF Satogata, T Cameron, P Cerniglia, P Cupolo, J Dawson, C Degen, C Mead, J Vetter, K BE Chew, J Lucas, P Webber, S TI Multi-million-turn beam position monitors for RHIC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB During the RHIC 2003 run, two beam position monitors (BPMs) in each transverse plane in the RHIC blue ring were upgraded with high-capacity mezzanine cards. This upgrade provided these planes with the capability to digitize up to 128 million consecutive turns of RHIC beam, or almost 30 minutes of continuous beam centroid phase space evolution for a single RHIC bunch. This paper describes necessary hardware and software changes and initial system performance. We discuss early uses and results for diagnosis of coherent beam oscillations, turn-by-turn (TBT) acquisition through a RHIC acceleration ramp, and ac-dipole nonlinear dynamics studies. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Satogata, T (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2697 EP 2699 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600856 ER PT B AU Tan, CY Zhang, XL Lebrun, P AF Tan, CY Zhang, XL Lebrun, P BE Chew, J Lucas, P Webber, S TI Tune measurement methods of the Tevatron SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We will discuss several methods for measuring the tunes in the Tevatron. These methods can be separated into three classes: active, passive and hybrid. In the active method, the beam is tickled in order to obtain a frequency response. In the passive method, a Schottky detector which uses a resonant stripline is used to measure the Schottky spectrum of the beam. In the hybrid method, we tickle the beam using kickers, or the Tevatron Electron Lens (TEL) in order to bring the tune signal above the noise floor of the Schottky detectors. An automatic tune fitting algorithm is also under development which allows us to measure the tune without human intervention. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Tan, CY (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2703 EP 2705 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600858 ER PT B AU Assadi, S Aleksandrov, A Blokland, W DeCarlo, A Deibele, C Gibson, P Grice, W Hechler, M Hunter, T Kelly, J Ladd, P Murdoch, G Plum, M Pogge, J Potter, K Purcell, D Shea, T Stout, D AF Assadi, S Aleksandrov, A Blokland, W DeCarlo, A Deibele, C Gibson, P Grice, W Hechler, M Hunter, T Kelly, J Ladd, P Murdoch, G Plum, M Pogge, J Potter, K Purcell, D Shea, T Stout, D BE Chew, J Lucas, P Webber, S TI The SNS laser profile monitor design and implementation SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB After a successfill demonstration of a non-intercepting beam profile monitor for the H- beams at the 750 KeV and the 200 MeV LINAC at Brookhaven National Laboratory, the SNS project approved using a Nd:YAG laser rather than the traditional carbon wire for transverse profile monitors in the SNS super-conducting LINAC. Experiments have also been performed on SNS 2.5 MeV medium energy beam transport line at LBNL. The design and the implementation of a multi-station profile monitoring system using a single laser will be presented. The laser beam is scanned across the H- beam to photo-neutralize narrow slices. The liberated electrons are collected to provide a measurement of the transverse beam profile. The prototype system has been tested; the measurement and performance results will be presented. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP Assadi, S (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RI Grice, Warren/L-8466-2013; OI Grice, Warren/0000-0003-4266-4692 NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2706 EP 2708 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600859 ER PT B AU de Santis, S Wolski, A AF de Santis, S Wolski, A BE Chew, J Lucas, P Webber, S TI Harmonic cavities for the NLC damping rings SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB To achieve high luminosity, a linear collider needs damping rings to produce beams with very small transverse emittances. In the NLC, design constraints place the Main Damping Rings in a parameter regime where intrabeam scattering (IBS) is likely to be a limitation on the emitittance, and hence on the final luminosity. It is possible to mitigate the effects of IBS by lengthening the bunch: this may he achieved by redesigning the lattice with higher momentum compaction, or by use of higher harmonic cavities. Here, we consider the latter approach. We estimate the required bunch lengthening that might be needed, outline some appropriate parameters for the harmonic cavities, and discuss some of the effects that might be introduced or exacerbated by the cavities, such as synchronous phase variation along the bunch train. C1 LBNL, Berkeley, CA 94720 USA. RP de Santis, S (reprint author), LBNL, Berkeley, CA 94720 USA. OI Wolski, Andrzej/0000-0002-5057-5588 NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2745 EP 2747 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600872 ER PT B AU Asiri, F Le Pimpec, F Seryi, A AF Asiri, F Le Pimpec, F Seryi, A BE Chew, J Lucas, P Webber, S TI Study of near-field vibration sources for the NLC Linac components SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The vibration stability requirements for the Next Linear Collider (NLC) are far more stringent than for the previous generation of Colliders. To meet these goals, it is imperative that the effects of vibration on NLC Linac components from near-field sources (e.g. compressors, high vacuum equipment, klystrons, modulators, pumps, fans, etc) be well understood. The civil construction method, whether cut-and-cover or parallel bored tunnels, can determine the proximity and possible isolation of noise sources. This paper presents a brief summary and analysis of recently completed and planned studies for characterization of near-field vibration sources under either construction method. The results of in-situ vibration measurements will also be included. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Asiri, F (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2748 EP 2750 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600873 ER PT B AU Batygin, YK Sheppard, JC AF Batygin, YK Sheppard, JC BE Chew, J Lucas, P Webber, S TI Capture and polarization of positrons in a proposed NLC polarized positron source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A proposed NLC polarized positron source utilizes a 150 GeV electron beam passing through a helical undulator. The resulting flux of polarized photons is converted in a thin positron production target. Spin polarized positrons are captured using a high field flux concentrator followed by an accelerator section immersed in a solenoidal field. Positron tracking through the accelerating and focusing systems is done together with integration of spin precession. Optimization of the collection system is performed to insure high positron yield into the 6-dimensional acceptance of the subsequent pre-damping ring while keeping the high value of positron beam polarization. C1 SLAC, Stanford, CA 94309 USA. RP Batygin, YK (reprint author), SLAC, Stanford, CA 94309 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2751 EP 2753 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600874 ER PT B AU Decker, FJ Raubenheimer, TO Seryi, A Turner, JL Woods, M Yocky, J AF Decker, FJ Raubenheimer, TO Seryi, A Turner, JL Woods, M Yocky, J BE Chew, J Lucas, P Webber, S TI A test of NLC-type beam loading in the SLAC linac SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The linac at the Stanford Linear Accelerator (SLAC) runs routinely with a beam loading of around 12% for the fixed target experiment E-158. Typical energy spread and energy jitter are 0.1% and 0.05%. To explore the conditions for the Next Linear Collider (NLC) the linac was operated with 20% beam loading. This was attained by increasing the beam charge from 5.10(11) to 9-10(11) particles and increasing the pulse length from 250 ns to 320ns. Although the beam loading compensation was more difficult to achieve, a reliable operating point was found with a similar energy spread and energy jitter as at the lower loading. Furthermore, using the sub-harmonic buncher (SHB), the beam was bunched at 178.5 MHz instead of the nominal 2.8 GHz so that the charge from 16 adjacent buckets was combined into one. Increased transverse instability and beam losses along the linac were observed indicating the possible onset of beam break-up. C1 SLAC, Stanford, CA 94309 USA. RP Decker, FJ (reprint author), SLAC, Stanford, CA 94309 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2754 EP 2756 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600875 ER PT B AU Hendrickson, L Himel, T Raubenheimer, TO Seryi, A Tenenbaum, P Woodley, M AF Hendrickson, L Himel, T Raubenheimer, TO Seryi, A Tenenbaum, P Woodley, M BE Chew, J Lucas, P Webber, S TI Implementation of dynamic misalignments and luminosity stabilization SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB To fully characterize the luminosity performance of a linear collider, it is important to simulate the effects of ground motion as well as the beam-beam feedback and other stabilization systems planned to compensate for that motion. The linear collider simulation codes have recently been extended to include both ground motion models and stabilization systems to support the work of the International Linear Collider Technical Review Committee (TRC) [1]. This paper discusses the implementation details and the optimization strategies for interpulse beam-beam feedback. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Hendrickson, L (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2757 EP 2759 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600876 ER PT B AU Jones, RM Li, Z Miller, RH Raubenheimer, TO AF Jones, RM Li, Z Miller, RH Raubenheimer, TO BE Chew, J Lucas, P Webber, S TI Optimized wakefield suppression & emittance dilution-imposed alignment tolerances in X-band accelerating structures for the JLC/NLC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In order to prevent electrical breakdown occurring in the JLC/NLC (Japanese Linear Collider/Next Linear Collider) X-band structures several new structures are under investigation. These accelerating structures represent an evolutionary design of the DDS series of structures [1]. The phase advance per cell has been varied and the detailed elliptical shape of the cell has been varied in order to simultaneously minimize the group velocity, the surface electromagnetic fields and the pulse temperature rise on the copper surface [2]. It is also important to ensure that the wakefield induced by multiple bunches traversing the accelerating structures does not disrupt trailing bunches. The long-range wakefield must be decreased adequately in order to prevent a BBU (Beam Break Up) instability occurring and to ensure that emittance dilution due to the higher order modes is kept to acceptable levels. The long-range wakefield is forced to de-cohere by detuning all of the frequencies such that the mode density of frequencies is approximately Gaussian. In order to minimize the impact of the wakefield on the beam dynamics we change the bandwidth and the standard deviation of the Gaussian distribution of frequencies such that a "cost function" is minimized. Interleaving of cell frequencies of adjacent structures is required to adequately damp the wakefield of each particular structure under consideration. The resulting alignment tolerances imposed on the cells and structures is significantly looser alignment tolerances with the use of the code. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Jones, RM (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. OI Jones, Roger/0000-0001-6528-214X NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2760 EP 2762 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600877 ER PT B AU Jones, RM Dolgashev, VA Miller, RH Adolphsen, C Wang, JW AF Jones, RM Dolgashev, VA Miller, RH Adolphsen, C Wang, JW BE Chew, J Lucas, P Webber, S TI Energy dispersion compensation and beam loading in X-band linacs for the JLC/NLC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The shape of an RF pulse is distorted upon propagating through an X-band accelerator structure due to dispersive effects. This distortion together with beam loading introduce energy spread between 192 bunches. In order to minimize this energy spread we modify the input RF pulse shape. The pulse propagation, energy gain, and beam loading are modelled with a mode-matching computer code and a circuit model. A 2D model and a circuit model of a complete 60 cm structure, consisting of 55 cells and input and output couplers is analyzed. This structure operates with a 5pi/6 phase advance per cell. Dispersive effects for this structure are more significant than for previously studied 2pi/3 phase advance accelerating structures. Experimental results are compared with the theoretical model and excellent agreement is obtained for the propagation of an RF pulse through the structure. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Jones, RM (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. OI Jones, Roger/0000-0001-6528-214X NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2763 EP 2765 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600878 ER PT B AU Seryi, A Woodley, M Raimondi, P AF Seryi, A Woodley, M Raimondi, P BE Chew, J Lucas, P Webber, S TI A recipe for linear collider final focus system design SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The design of Final Focus systems for linear colliders is challenging because of the large demagnifications needed to produce nanometer-sized beams at the interaction point. Simple first- and second-order matrix matching have proven insufficient for this task, and minimization of third- and higher-order aberrations is essential. An appropriate strategy is required for the latter to be successful. A recipe for Final Focus design, and a set of computational tools used to implement this approach, are described herein. An example of the use of this procedure is given. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Seryi, A (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2766 EP 2768 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600879 ER PT B AU Venturini, M Wolski, A Dragt, A AF Venturini, M Wolski, A Dragt, A BE Chew, J Lucas, P Webber, S TI Wigglers and single-particle dynamics in the NLC damping rings SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Wiggler insertions are expected to occupy a significant portion of the lattice of the Next Linear Collider (NLC) Main Damping Rings (MDR) and have a noticeable impact on the single-particle beam dynamics. Starting from a realistic 3D representation of the magnetic fields we calculate the transfer maps for the wigglers, accounting for linear and nonlinear effects, and we study the beam dynamics with particular attention paid to the Dynamic Aperture (DA). A DA reduction is observed but appears to remain within acceptable limits. C1 LBNL, Berkeley, CA 94720 USA. RP Venturini, M (reprint author), LBNL, Berkeley, CA 94720 USA. OI Wolski, Andrzej/0000-0002-5057-5588 NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2772 EP 2774 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600881 ER PT B AU Wolski, A Raubenheimer, TO Woodley, M Wu, J AF Wolski, A Raubenheimer, TO Woodley, M Wu, J BE Chew, J Lucas, P Webber, S TI A lattice with larger momentum compaction for the NLC main damping rings SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Previous lattice designs for the Next Linear Collider Main Damping Rings [1] have met the specifications for equilibrium emittance, damping rate and dynamic aperture. Concerns about the effects of the damping wiggler on the beam dynamics [2] led to the aim of reducing the total length of the wiggler to a. minimum consistent with the required damping rate, so high-field dipoles were used to provide a significant energy loss in the arcs. However, recent work has shown that the wiggler effects may not be as bad as previously feared. Furthermore, other studies have suggested the need for an increased momentum compaction (by roughly a factor of four) to raise the thresholds of various collective effects. We have therefore developed a new lattice design in which we increase the momentum compaction by reducing the field strength in the arc dipoles, compensating the loss in damping rate by increasing the length of the wiggler. The new lattice again meets the specifications for emittance, damping rate and dynamic aperture, while having the benefit of significantly higher thresholds for a number of instabilities. C1 SLAC, Menlo Pk, CA 94025 USA. RP Wolski, A (reprint author), SLAC, Menlo Pk, CA 94025 USA. OI Wolski, Andrzej/0000-0002-5057-5588 NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2775 EP 2777 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600882 ER PT B AU Ruggiero, AG Alessi, J Raparia, D Roser, T Weng, W AF Ruggiero, AG Alessi, J Raparia, D Roser, T Weng, W BE Chew, J Lucas, P Webber, S TI Ags upgrade to 1-MW with a super-conducting linac injector SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB It has been proposed to upgrade the Alternating Gradient Synchrotron (AGS) accelerator complex at the Brookhaven National Laboratory (BNL) to provide an average proton beam power of I MW at the energy of 28 GeV. The facility is to be primarily used as a proton driver for the production of intense neutrino beams [1]. This paper reports on the feasibility study of a proton Super-Conducting Linac (SCL) as a new injector to the AGS. The Linac beam energy is 1.2 GeV. The beam intensity is adjusted to provide the required average beam power of 1 MW at 28 GeV. The repetition rate of the SCL-AGS facility is 2.5 beam pulses per second. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Ruggiero, AG (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2793 EP 2795 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600888 ER PT B AU Ruggiero, AG Ludewig, H Shapiro, S AF Ruggiero, AG Ludewig, H Shapiro, S BE Chew, J Lucas, P Webber, S TI Study of a 10-MW continuous spallation neutron source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB This paper reports on the feasibility study of a proton Super-Conducting Linac as the driver for an Accelerator-based Continuous Neutron Source (ACNS) [1] to be located at Brookhaven National Laboratory (BNL). The Linac is to be operated in the Continuous Wave (CW) mode to produce an average 10 MW of beam power. The Linac beam energy is taken to be 1.25 GeV. The required average proton beam intensity in exit is then 8 mA. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Ruggiero, AG (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2796 EP 2798 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600889 ER PT B AU Rose, J Podobedov, B Murphy, J Shaftan, T Sheehy, B Wang, XJ Yu, LH AF Rose, J Podobedov, B Murphy, J Shaftan, T Sheehy, B Wang, XJ Yu, LH BE Chew, J Lucas, P Webber, S TI A SCRF linac as a FEL driver and storage ring injector SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A 5 GeV Super-conducting Radio Frequency (SCRF) linac for the dual application of FEL driver and top-off injector for a storage ring is described. Starting from the FEL drive beam requirements of sub-picosecond bunch lengths and kiloamp peak current the choice of frequency, gradient and operating modes of the linac are presented. Magnetic optics and RF system descriptions follow to provide the specified beam parameters. Accelerator design issues are identified for future studies. C1 BNL, Upton, NY 11973 USA. RP Rose, J (reprint author), BNL, Upton, NY 11973 USA. RI Shaftan, Timur/A-8443-2009 NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2808 EP 2810 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600893 ER PT B AU Ilg, T Martineau, R Sims, J Fox, W Ellis, F Gentzlinger, R Rowton, L Johnson, G AF Ilg, T Martineau, R Sims, J Fox, W Ellis, F Gentzlinger, R Rowton, L Johnson, G BE Chew, J Lucas, P Webber, S TI Mechanical design of the drift-tube linac (DTL) for the spallation neutron source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Spallation Neutron Source (SNS) utilizes a linac to accelerate H- ions to 1 GeV at an average beam power of 1.4 MW. The linac consists of four RF structures: a 2.5-MeV RFQ, an 87-MeV DTL, a 186-MeV CCL, and a 1-GeV SRF linac. The DTL is divided into six RF structures, each powered by a 2.5-MW klystron. Design and fabrication of the DTL has been completed, and LANL has aligned and tuned the first structure (Tank #3) to be installed at ORNL. The description of the design and fabrication process, including machining and copper plating of the tank sections, machining and welding of the drift tubes. Also, design and fabrication of the post couplers, slug tuners, endwalls, Iris waveguide, and support structure is discussed. In addition, the assembly and alignment of the RF components using the Leica Laser Tracker System Coordinate Measuring Machine are also discussed. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Ilg, T (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 2 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2841 EP 2843 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600904 ER PT B AU Bultman, N Billen, J Chen, Z Collier, M Richards, D Young, L AF Bultman, N Billen, J Chen, Z Collier, M Richards, D Young, L BE Chew, J Lucas, P Webber, S TI Fabrication and tuning of the SNSCCL hot model SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A full-scale powered model of the SNS CCL was completed in August 2001. The manufacturing processes and tuning procedures used in the CCL Hot Model formed the basis of the main manufacturing contract for the SNS CCL system later placed in private industry. In this paper we summarize the design basis for the CCL and the manufacturing and process steps required to fabricate and of the various tooling and lifting and handling fixtures utilized in the process at the various machining, brazing, welding, and tuning steps. The tooling utilized in the fabrication and tuning process is discussed in detail. The ultimate successful testing of the CCL hot model was key to development of a manufacturing plan for the CCL system. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Bultman, N (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2844 EP 2846 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600905 ER PT B AU Stein, W AF Stein, W BE Chew, J Lucas, P Webber, S TI RIA fragmentation line beam dump SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Rare Isotope Accelerator project involves generating heavy element ion beams for use in a fragmentation target line to produce selected ion beams for physics research experiments. The main beam and fission fragments, after passing through the target, are collected and passed along by a series of collecting magnets and a dipole magnet. In the first dipole magnet, the main beam impacts onto a beam dump located on each side of the magnet vacuum chamber. A dump design that involves rotating cylinders and internal water cooling passages has been designed to absorb the glancing impact of the main beam. The beam power designed for is 100 kW and water cooling is by turbulent sub-cooled forced convection. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Stein, W (reprint author), Lawrence Livermore Natl Lab, POB 5508, Livermore, CA 94551 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2847 EP 2848 PG 2 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600906 ER PT B AU Jeon, D Stovall, J Takeda, H Crandall, K AF Jeon, D Stovall, J Takeda, H Crandall, K BE Chew, J Lucas, P Webber, S TI Impact of cavity RF field phase and amplitude control uncertainties on the SNS linac SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB There is an accuracy limit of LLRF control ever cavity rf phase and amplitude. This limited accuracy of control gives rise to beam energy and phase jitter, emittance growth, and beam loss. In the case of the SNS linac [1], there are a few limiting factors such as minimizing injection foil miss, acceptable ring injection painting, and beam loss in the linac which are related with the LLRF control errors. We studied the impact of +/-1degrees / +/-1% and +/-0.5degrees / +/-0.5% rf phase and amplitude uncertainties to the linac using the Ltrace and Parmila codes. C1 Oak Ridge Natl Lab, SNS Project, Oak Ridge, TN 37830 USA. RP Jeon, D (reprint author), Oak Ridge Natl Lab, SNS Project, Oak Ridge, TN 37830 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2855 EP 2856 PG 2 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600909 ER PT B AU Mammosser, J Delayen, J Gordon, J Phillips, L Valente, AM Wang, T Wu, AT Saunders, J AF Mammosser, J Delayen, J Gordon, J Phillips, L Valente, AM Wang, T Wu, AT Saunders, J BE Chew, J Lucas, P Webber, S TI Status of the production electropolishing system at JLAB SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Jefferson Lab has installed, and is in the process of commissioning, a production electropolish system, sized for 805MHz SNS cavities. This paper describes the basic system design, plans for studying the effectiveness of polishing SNS high-beta cavities and early results from cavity tests. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Mammosser, J (reprint author), Jefferson Lab, Newport News, VA 23606 USA. NR 6 TC 0 Z9 0 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2860 EP 2862 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600911 ER PT B AU Schneider, WJ Kneisel, P Rode, CH AF Schneider, WJ Kneisel, P Rode, CH BE Chew, J Lucas, P Webber, S TI Gradient optimisation for SCCW accelerators SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The proposed rare isotope accelerator (RIA) design consists of a normally conducting radio frequency quadruple (RFQ) section, a superconducting (SC) drift tube cavity section, a SC elliptical multi-cell cavity section and two charge strippers with associated charge state selection and beam matching optics. The SC elliptical section uses two or three multi-cell beta cavity types installed into cryomodules to span the energy region of about 84.5 MeV/nucleon up to 400 MeV/nucleon. This paper focuses on the gradient optimization of these SC elliptical cavities that provide a significant portion of the total acceleration to the beam. The choice of gradient coupled with the cavity quality factor has a strong affect on the overall cost of the accelerator. The paper describes the optimization of the capital and operating cost associated with the RIA elliptical cavity cryo modules. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Schneider, WJ (reprint author), Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2863 EP 2865 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600912 ER PT B AU Teng, LC AF Teng, LC BE Chew, J Lucas, P Webber, S TI Linear coupling of RMS emittances SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A general formulation of the linearly coupled rms emittances in two degrees of freedom is given. This formulation shows clearly what can be done to the emittances and how best to design for the necessary coupling. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Teng, LC (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2895 EP 2897 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600923 ER PT B AU Cardona, J Peggs, S Satogata, T Tomas, R AF Cardona, J Peggs, S Satogata, T Tomas, R BE Chew, J Lucas, P Webber, S TI Action and phase analysis to determine sextupole errors in RHIC and the SPS SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Success in the application of the action and phase analysis to find linear errors at RHIC Interaction Regions [1] has encouraged the creation of a technique based on the action and phase analysis to find non linear errors. In this paper we show the first attempt to measure the sextupole components at RHIC interaction regions using the action and phase method. Experiments done by intentionally activating sextupoles in RHIC and in SPS [2] will also be analyzed with this method. First results have given values for the sextupole errors that at least have the same order of magnitude as the values found by an alternate technique during the RHIC 2001 run [3]. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Cardona, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2901 EP 2903 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600925 ER PT B AU Fliller, RP Drees, A Gassner, D McIntyre, G Peggs, S Trbojevic, D AF Fliller, RP Drees, A Gassner, D McIntyre, G Peggs, S Trbojevic, D BE Chew, J Lucas, P Webber, S TI Beam diffusion measurements at RHIC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB During a store, particles from the beam core continually diffuse outwards into the halo through a variety of mechanisms. Understanding the diffusion rate as a function of particle amplitude can help discover which processes are important to halo growth. A collimator can be used to measure the amplitude growth rate as a function of the particle amplitude. In this paper we present results of diffusion measurements performed at the Relativistic Heavy Ion Collider (RHIC) with fully stripped gold ions, deutrons, and protons. We compare these reults with measurements from previous years, and simulations, and discuss any factors that relate to beam growth in RHIC. C1 BNL, Upton, NY 11793 USA. RP Fliller, RP (reprint author), BNL, Upton, NY 11793 USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2904 EP 2906 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600926 ER PT B AU Montag, C AF Montag, C BE Chew, J Lucas, P Webber, S TI Measurement of the nonlinear momentum compaction factor in RHIC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB During gold beam acceleration in the Relativistic Heavy Ion Collider (RHIC), the transition energy has to be crossed at gamma(t) approximate to 23. Since close to gamma(t) the longitudinal slip factor gamma(t)(-2) - gamma(-2) becomes very small, the longitudinal momentum compaction factor alpha(1) becomes significant. Measurements of this factor using longitudinal phase space tomography will be reported. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Montag, C (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2907 EP 2909 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600927 ER PT B AU Talman, R Malitsky, N AF Talman, R Malitsky, N BE Chew, J Lucas, P Webber, S TI Beam-based BPM alignment SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB An operational, beam-based, null-measurement, control room procedure designed to steer the closed orbit through the effective (no steer) center of every quadrupole is described. Performance of the procedure is simulated using UAL (Unified Accelerator Libraries). Matching SNS hardware availability, quadrupole strengths are assumed to be trimmable, but only in families, not individually. The accuracy of the procedure is unaffected by geometric and/or electrical misalignment of BPM's (beam position monitors) but calibration of their misalignments is a byproduct of the procedure. Some of the many possible failure mechanisms have been modeled, and have been found not to invalidate the procedure. C1 Brookhaven Natl Lab, Spallat Neutron Project, Collider Accelerator Dev Dept, Upton, NY 11973 USA. RP Talman, R (reprint author), Brookhaven Natl Lab, Spallat Neutron Project, Collider Accelerator Dev Dept, Upton, NY 11973 USA. NR 0 TC 2 Z9 2 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2919 EP 2921 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600931 ER PT B AU Choi, W Griffin, J Ng, KY Wildman, D Zheng, H AF Choi, W Griffin, J Ng, KY Wildman, D Zheng, H BE Chew, J Lucas, P Webber, S TI Barrier RF stacking at Fermilab SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A key issue to upgrade the luminosity of the Tevatron Run2 program and to meet the neutrino requirement of the NuMI experiment at Fermilab is to increase the proton intensity on the target. This paper introduces a new scheme to double the number of protons from the Main Injector (MI) to the pbar production target (Run2) and to the pion production target (NuMI). It is based on the fact that the MI momentum acceptance is about a factor of four larger than the momentum spread of the Booster beam. Two RF barriers - one fixed, another moving - are employed to confine the proton beam. The Booster beams are injected off-momentum into the MI and are continuously reflected and compressed by the two barriers. Calculations and simulations show that this scheme could work provided that the Booster beam momentum spread can be kept under control. Compared with slip stacking, a main advantage of this new method is small beam loading effect thanks to the low peak beam current. The RF barriers can be generated by an inductive device, which uses nanocrystal magnet alloy (Finemet) cores and fast high voltage MOSFET switches. This device has been designed and fabricated by a Fermilab-KEK-Caltech team. The first bench test was successful. Beam experiments are being planned. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Choi, W (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 13 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2922 EP 2924 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600932 ER PT B AU Chou, W Drozhdin, A Lucas, P Ostiguy, F AF Chou, W Drozhdin, A Lucas, P Ostiguy, F BE Chew, J Lucas, P Webber, S TI Fermilab Booster modeling and space charge study SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Fermilab Booster is a bottleneck limiting the proton beam intensity in the accelerator complex. A study group has been formed in order to have a better understanding of this old machine and seek possible improvements [1]. The work includes lattice modeling, numerical simulations, bench measurements and beam studies. Based on newly obtained information, it has been found that the machine acceptance is severely compromised by the orbit bump and dogleg magnets. This, accompanied by emittance dilution from space charge at injection, is a major cause of the large beam loss at the early stage of the cycle. Measures to tackle this problem are being pursued. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Chou, W (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2925 EP 2927 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600933 ER PT B AU Gounder, K Marriner, J Mishra, S AF Gounder, K Marriner, J Mishra, S BE Chew, J Lucas, P Webber, S TI Ion production and tune shift in the recycler ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We calculate the ion production rate for a beam of 2 x 10(12) antiprotons in the Recycler Ring using the known vacuum residual gas composition. We study the effect of ion buildup around the antiproton beam on beam lifetime and stability. We compare the ion production rate with the actual measurement using the beam tune shifts when the RF gap in the circulating beam is removed. Work supported by the U.S. Department of Energy under contract No. DE-AC02-76CH03000. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Gounder, K (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2928 EP 2930 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600934 ER PT B AU Johnstone, C Gattuso, C Johnson, D Syphers, M Paul, K AF Johnstone, C Gattuso, C Johnson, D Syphers, M Paul, K BE Chew, J Lucas, P Webber, S TI Analysis and measurements of emittance dilution from vacuum windows in the fermilab recycler transfer lines SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Round-trip beam transfers between the Fermilab Main Injector and Recycler (antiproton accumulator) have been plagued by an emittance dilution of about a factor of 2 with corresponding beam loss. The source of the large dilution was traced to two Ti vacuum windows, one installed in each of the two transfer lines that connect the machines for beam injection/extraction. The dilution can be accounted for by calculating the increase in beam divergence due to multiple scattering in the windows followed by an amplitude mismatch that serves to further enhance the instantaneous dilution immediately downstream of the window. This work presents the analytical basis for the phase-space, or emittance, dilution due to the window, the subsequent optics mismatch, and then presents an analysis of beamline measurements that evidences the effect and validates the analytical argument. The data showed a strong skew quadrupole component in the transfer line optics that initially complicated the analysis, but was effectively eliminated in some of the data samples acquired under specific beam conditions. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Johnstone, C (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2931 EP 2933 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600935 ER PT B AU Kobilarcik, T DeVoy, J Moore, C AF Kobilarcik, T DeVoy, J Moore, C BE Chew, J Lucas, P Webber, S TI Automatic beamline correction SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Experience has shown that in any fixed target experiment at Fermilab, the primary beam tends to "drift" over time. There are many causes for this drift, such as diumal variation in temperature affecting control cards. Traditionally, it was the role of the operations group to monitor the beam position and make apropriate corrections. When several HEP programs are run simultaneously, the number of operators needed to monitor the beamlines becomes large. Additionally, the work is extremely tedious-watching several monitors, making small corrections (and usually only being able to correct one position at a time). Even when features such as "three bumps" are incorpoated in the control system, an operator can only adjust one position at a time. Thus, making corrections to a beamline is a job well suited to automation. The response of the beam to changing individual magnets can be well characterized; the beam can be continuously monitored; appropriate limits can be placed so that the program "calls an expert" (for example, by setting an alarm) if conditions change too severely. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Kobilarcik, T (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2934 EP 2935 PG 2 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600936 ER PT B AU Prebys, E Ankenbrandt, C Chou, W Drozhdin, A Kasper, P Lackey, J Mokhov, N Pellico, W Tomlin, R Webber, R AF Prebys, E Ankenbrandt, C Chou, W Drozhdin, A Kasper, P Lackey, J Mokhov, N Pellico, W Tomlin, R Webber, R BE Chew, J Lucas, P Webber, S TI Increasing tbe intensity of the Fermilab Booster SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Fermilab Booster is a fast-cycling synchrotron which accelerates protons from 400 MeV to 8 GeV of kinetic energy. Until recently, the primary demand for protons was for antiproton production, which typically uses about 7E15 protons per hour. Over the next few years, the Fermilab neutrino program will increase that demand dramatically, possibly beyond 1.8E17 protons per hour. This paper discusses the issues involved in reaching these intensities, and the plan for achieving them. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Prebys, E (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2936 EP 2938 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600937 ER PT B AU Spentzouris, P Amundson, J AF Spentzouris, P Amundson, J BE Chew, J Lucas, P Webber, S TI FNAL Booster: Experiment and modeling SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We present measurements of transverse and longitudinal beam phase space evolution during the first two hundred turns of the FNAL Booster cycle. We discuss the experimental techinque, which allowed us to obtain turn-by-turn measurements of the beam profile. The experimental results are compared with the prediction of the,Synergia 3D space charge simulation code. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Spentzouris, P (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2939 EP 2941 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600938 ER PT B AU Blind, B Jason, AJ AF Blind, B Jason, AJ BE Chew, J Lucas, P Webber, S TI Jitter control and scraping in the 12-view AHF HEBT SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The HEBT of the proposed Advanced Hydrotest Facility (AHF) [1] is designed to deliver 50-GeV protons to an object from 12 directions, 15degrees apart. Individual beam bunches extracted from a synchrotron are split with 11 sets of septa such that, nominally, the same number of particles arrives from each direction. Extraction-kicker jitter can be expected, and can result in beam-intensity fluctuations in the 12 lines to the object. The HEBT tune is chosen to minimize this effect, with interesting consequences for the beam-splitting process. Beam splitting in each set of septa is initiated by a wire septum, with some particles hitting the wires. Particle-tracking simulations predict that activation of beamline components due to these affected particles can be kept low with sets of scrapers. They also predict that the scraping scheme is not sensitive to beam-position jitter from extraction-kicker jitter, or to average-energy jitter. Details of the jitter study and the scraping study are discussed. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Blind, B (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2948 EP 2950 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600941 ER PT B AU Kalnins, JG AF Kalnins, JG BE Chew, J Lucas, P Webber, S TI The use of electric multipole lenses for bending and focusing polar molecules, with application to the design of a rotational-state separator SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The dipole interaction (Stark effect) of a polar molecule allows one to use an inhomogeneous electric field to bend and focus a neutral beam in a transport line. The dependence of the optics on the Stark potential energy is discussed and we describe the type of multipole-field lenses that are needed. The special features that differ from charged particle optics are discussed. The RMS envelope equations are used to design a rotational-state separator to be built at LBNL. Its performance is simulated using the non-linear trajectory equations (with off-energy molecules included) and we find good state selection. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Kalnins, JG (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2951 EP 2953 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600942 ER PT B AU Qiang, J Ryne, RD Hofmann, I AF Qiang, J Ryne, RD Hofmann, I BE Chew, J Lucas, P Webber, S TI Space-charge driven emittance growth in a 3D mismatched anisotropic beam SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID MODEL AB In this paper we present a 3D simulation study of the emittance growth in a mismatched anisotropic beam. The equipartitioning driven by a 4th order space-charge resonance can be significantly modified by the presenc of mismatch oscillation and halo formation. This causes emittance growth in both the longitudinal and transverse directions which could drive the beam even further away from equipartition. The averaged emittance growth per degree of freedom follows the upper bound of the 2D free energy limit plus the contributions from eqipartitioning. C1 LBNL, Berkeley, CA 94720 USA. RP Qiang, J (reprint author), LBNL, Berkeley, CA 94720 USA. NR 11 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2954 EP 2956 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600943 ER PT B AU Anderson, SG Brown, WJ Tremaine, AM Musumeci, P Rosenzweig, JB AF Anderson, SG Brown, WJ Tremaine, AM Musumeci, P Rosenzweig, JB BE Chew, J Lucas, P Webber, S TI Pulse compression via velocity bunching with the LLNL Thomson X-ray source photoinjector SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID INJECTOR; BEAMS AB We report the compression of a high brightness, relativistic electron beam to rms lengths below 300 femtoseconds using the velocity compression technique in the LLNL Thomson X-ray source photoinjector. The results are consistent with analytical and computational models of this process. The emittance evolution of the beam during compression is investigated in simulation and found to be controllable with solenoid focusing. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Anderson, SG (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 16 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2957 EP 2959 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600944 ER PT B AU Chen, YJ Chambers, FW Paul, AC Watson, JA Weir, JT AF Chen, YJ Chambers, FW Paul, AC Watson, JA Weir, JT BE Chew, J Lucas, P Webber, S TI Eliminating the spot dilution due to kicker switching in DARHT-II SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB To produce four short x-ray pulses for radiography, the second-axis of the Dual Axis Radiographic Hydrodynamic Test facility (DARHT-II) will use a fast kicker to select current pulses out of the 2-mus duration beam provided by the accelerator. Beam motion during the kicker voltage switching could lead to dilution of the time integrated beam spot and make the spot elliptical. A large elliptical x-ray source produced by those beams would degrade the resolution and make radiographic analysis difficult. We have developed a tuning strategy to eliminate the spot size dilution, and tested the strategy successfully on ETA-II with the DARHT-II kicker hardware. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Chen, YJ (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2960 EP 2962 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600945 ER PT B AU Kaganovich, ID Startsev, EA Davidson, RC O'Rourke, S Lee, EP AF Kaganovich, ID Startsev, EA Davidson, RC O'Rourke, S Lee, EP BE Chew, J Lucas, P Webber, S TI Plasma neutralization models for intense ion beam transport in plasma SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID CHAMBER AB Plasma neutralization of an intense ion pulse is of interest for many applications, including plasma lenses, heavy ion fusion, cosmic ray propagation, etc. An analytical electron fluid model has been developed based on the assumption of long charge bunches (1(b)>>r(b)). Theoretical predictions are compared with the results of calculations utilizing a particle-in-cell (PIC) code. The cold electron fluid results agree well with the PIC simulations for ion beam propagation through a background plasma. The analytical predictions for the degree of ion beam charge and current neutralization also agree well with the results of the numerical simulations. The model predicts very good charge neutralization (>99%) during quasi-steady-state propagation, provided the beam pulse duration tau(b) is much longer than the electron plasma period 2pi/w(p), where w(p) = ( 4pie(2)n(p)/m)(1/2) is the electron plasma frequency, and n(p) is the background plasma density. In the opposite limit, the beam pulse excites large-amplitude plasma waves. The analytical formulas derived in this paper can provide an important benchmark for numerical codes, and provide scaling relations for different beam and plasma parameters. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Kaganovich, ID (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2975 EP 2977 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600950 ER PT B AU Startsev, EA Davidson, RC AF Startsev, EA Davidson, RC BE Chew, J Lucas, P Webber, S TI Intense sheet beam stability properties for uniform phase-space density SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A self-consistent one-dimensional waterbag equilibrium f(b)(omicron)(x, p(x)) for a sheet beam propagating through a smooth focusing field is shown to be exactly solvable for the beam density n(b)(o)(x) and space-charge potential phi(omicron)(x). A closed Schrodinger-like eigenvalue equation is derived for small-amplitude perturbations, and the WKB approximation is employed to determine the eigenfrequency spectrum as a function of the normalized beam intensity s(b =) (w) over cap (2)(pb)/gamma(b)(2)w(betaperpendicular to)(2) , where (w) over cap (2)(pb) = 4pi(n) over cap (b)e(b)(2)/gamma(b)m(b) is the relativistic plasma frequency-squared and (n) over cap (b) = n(b)(x = 0) is the on-axis number density of beam particles. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Startsev, EA (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2978 EP 2980 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600951 ER PT B AU Novokhatski, A Weathersby, S AF Novokhatski, A Weathersby, S BE Chew, J Lucas, P Webber, S TI RF modes in the PEP-II shielded vertex bellows SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Experimental and simulation study of RF modes were carried out for the complicated geometry of the shielded vertex bellows near the IP region of the PEP-II B-factory. A beam position monitor button electrode located 50 cm from the bellows provides a signal for spectrum measurement. Calculations indicate monopole, dipole and quadrupole modes can exist in the bellows structure near the experimentally observed frequency region of 5 GHz. The observed modes are correlated to the bellows heating. The beam-generated fields are scattered by the masks, taper and axial offsets and heat the bellows by coupling through the RF shield fingers. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Novokhatski, A (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 2981 EP 2983 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600952 ER PT B AU Parsa, Z Zadorozhny, V AF Parsa, Z Zadorozhny, V BE Chew, J Lucas, P Webber, S TI Acceleration and self-focused particle beam drivers SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn DE Vlasov-Maxwell equation; kernel operator; self-focused particle beams; asymptotic stability AB Here it is shown that the Vlasov equation is an adequate model in case of high-intensity charged-particle beams. everal instances are analyzed when it is possible to construct an integral basis of the operator, associated with the dynamic system under study. This is the case, in particular, for the two-dimensional dynamic systems, just such systems describing the longitudinal motion of a perturbed system. For systems of more general structure we advance a method of reduction of the quasilinear Vlasov equation to an integral Fredholm equation. The main cases are examined when it is possible to construct kernels of corresponding integral operators. In particular, a feasibility to employ Feier - Chesaro kernels is demonstrated. Using the universality (according to V.I.Zubov) of Maxwell equations the problem of a search for stabilizing and focusing fields is reduced to the construction of Toeplitz matrix. Also conditions are analyzed, ensuring initiating of a continuous spectrum points within the spectrum of a dynamic system. Physically, this phenomenon is related to the chaotic motion of the particles. Also, the dispersion equation, expressed in terms of solutions to the Fredholm equation, is deduced. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Parsa, Z (reprint author), Brookhaven Natl Lab, Dept Phys, 510A, Upton, NY 11973 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3005 EP 3007 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600960 ER PT B AU Chae, YC Harkay, K Sun, X AF Chae, YC Harkay, K Sun, X BE Chew, J Lucas, P Webber, S TI Vertical coupling impedance of the APS storage ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The three-dimensional wake potentials of the APS storage ring have been reconstructed according to the impedance database concept. Every wakefield-generating component in the ring was considered including small-gap insertion device (ID) chambers, rf cavities, shielded bellows, beam position monitors, synchrotron radiation absorbers, scrapers, flags, various chamber transitions, septum chambers, and pulsed kickers. In this paper the result for the vertical wake potentials and its impedance are presented. Dominant contributors are the ID chambers whose heights are 5 nun and 8 mm. Since more small-gap chambers are envisioned for installation in the APS storage ring, prediction of their effect on the beam is very important not only for the APS but also for all third-generation light sources. We used the vertical impedance reported here to investigate the measured tune slope and single-bunch current limit in the APS storage ring. The program elegant was used for particle tracking, and its results are presented. We also report that we observed a vertical focusing in the calculated wake potential of the shallow transition without rotational symmetry. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Chae, YC (reprint author), Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3008 EP 3010 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600961 ER PT B AU Chae, YC Harkay, K Sun, X AF Chae, YC Harkay, K Sun, X BE Chew, J Lucas, P Webber, S TI Horizontal coupling impedance of the APS storage ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The three-dimensional wake potentials of the APS storage ring have been reconstructed according to the impedance database concept. Every wakefield-generating component in the ring was considered including small-gap insertion device (ID) chambers, rf cavities, shielded bellows, beam position monitors, synchrotron radiation absorbers, scrapers, flags, various chamber transitions, septum chambers, and pulsed kickers. In this, paper the result for the horizontal wake potentials and its impedance are presented. The numerically obtained impedance has been used to investigate the experimental results. Tune shift was calculated and compared with the measurement. We also observed a horizontal focusing in the calculated wake potential of the shallow transition without rotational symmetry. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Chae, YC (reprint author), Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3011 EP 3013 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600962 ER PT B AU Chae, YC Harkay, K Sun, X AF Chae, YC Harkay, K Sun, X BE Chew, J Lucas, P Webber, S TI Longitudinal coupling impedance of the APS storage ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The three-dimensional wake potentials of the APS storage ring have been reconstructed according to the impedance database concept. Every wakefield-generating component in the ring was considered including small-gap insertion device (ID) chambers, rf cavities, shielded bellows, beam position monitors, synchrotron radiation absorbers, scrapers, flags, various chamber transitions, septum chambers, and pulsed kickers. In this paper the result for the longitudinal wake potentials and its impedance are presented. The total impedance is not model-based but the direct sum of numerical functions. The fit parameters for the broadband resonator model are also included as a convenient representation. We used this impedance model to investigate the observed microwave instability, namely bunch lengthening, anomalous energy spread, and coherent excitation at high synchrotron sideband. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Chae, YC (reprint author), Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. NR 1 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3014 EP 3016 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600963 ER PT B AU Chae, YC AF Chae, YC BE Chew, J Lucas, P Webber, S TI The impedance database and its application to the APS storage ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Since the operation of the APS storage ring, we have observed instabilities of different kinds. Some of them are not well understood and need further investigation; transverse saw-tooth instability and anomalous energy spread are examples. Quantitative understanding of these instabilities requires detailed knowledge of impedance of the ring. For this purpose we developed the concept of the impedance database, where the wake potential of each vacuum component in the ring is deposited and maintained in a standard form. These standardized wake-potentials can be manipulated with high flexibility by utilising the Self Describing Data Sets (SDDS) toolkit developed at Argonne National Laboratory. In this paper we will present the total impedance of the APS storage ring obtained by using the impedance database. Then we report the application of the total impedance to investigate the currently observed instabilities in the APS storage ring. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Chae, YC (reprint author), Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. NR 5 TC 5 Z9 5 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3017 EP 3019 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600964 ER PT B AU Blaskiewicz, M Brennan, JM Cameron, P Dawson, C Degen, C Drees, K Fischer, W Koropsak, E Michnoff, R Montag, C Roser, T Catalan-Lasheras, N AF Blaskiewicz, M Brennan, JM Cameron, P Dawson, C Degen, C Drees, K Fischer, W Koropsak, E Michnoff, R Montag, C Roser, T Catalan-Lasheras, N BE Chew, J Lucas, P Webber, S TI Transverse instabilities in RHIC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The beam quality in RHIC can be significantly impacted by a transverse instability which can occur just after transition[1]. Data characterizing the instability are presented and analyzed. Techniques for ameliorating the situation are considered. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Blaskiewicz, M (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3026 EP 3028 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600967 ER PT B AU Blaskiewicz, M Brennan, JM Cameron, P Fischer, W Wei, J Luque, A Schamel, H AF Blaskiewicz, M Brennan, JM Cameron, P Fischer, W Wei, J Luque, A Schamel, H BE Chew, J Lucas, P Webber, S TI Longitudinal solitons in RHIC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID COASTING BEAMS; HOLES AB Stable, coherent, longitudinal oscillations have been observed in the RHIC accelerator. Within the context of pertubation theory, the beam parameters and machine impedance suggest these oscillations should be Landau damped. When nonlinear effects are included, long lived, stable oscillations become possible for low intensity beams. Simulations and theory are compared with data. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Blaskiewicz, M (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM blaskiewicz@bnl.gov RI Luque, Alejandro/B-9132-2008 OI Luque, Alejandro/0000-0002-7922-8627 NR 12 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3029 EP 3031 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600968 ER PT B AU Fedotov, AV Wei, J Danilov, V AF Fedotov, AV Wei, J Danilov, V BE Chew, J Lucas, P Webber, S TI Effects of space charge and nonlinearities on collective instabilities of a long bunch SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We start with discussion of the effects of space charge and nonlinearities on the transverse microwave instability. A possibility of Landau damping with octupole correctors, using an example of the SNS ring, is explored. We also discuss the required strength of such nonlinearities for a bunched beam in the presence of the space-charge tune spread, as well as their effect on dynamic aperture and emittance dilution. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fedotov, AV (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 4 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3032 EP 3034 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600969 ER PT B AU Hahn, H Blaskiewicz, MM Davino, D AF Hahn, H Blaskiewicz, MM Davino, D BE Chew, J Lucas, P Webber, S TI Coupling impedance measurements of the SNS RF cavity and extraction kicker magnet SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Spallation Neutron Source (SNS) is a high intensity machine with peak currents in the accumulator ring reaching similar to50 A at the 1.4 MW design level. This unprecedented beam intensity necessitates a careful investigation of coupling impedances posing as potential performance limitations. Impedance estimates of accelerator components pointed to the RF cavities and extraction kickers as the major contributors to the impedance budget and extensive measurements were performed on their prototypes. Impedance measurements were performed using the standard wire method. C1 Brookhaven Natl Lab, SNS Project, Upton, NY 11973 USA. RP Hahn, H (reprint author), Brookhaven Natl Lab, SNS Project, Upton, NY 11973 USA. OI Davino, Daniele/0000-0002-7492-8173 NR 10 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3035 EP 3037 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600970 ER PT B AU Ivanov, PM Annala, J Burov, A Lebedev, V Lorman, E Ranjbar, V Scarpine, V Shiltsev, V AF Ivanov, PM Annala, J Burov, A Lebedev, V Lorman, E Ranjbar, V Scarpine, V Shiltsev, V BE Chew, J Lucas, P Webber, S TI Head-tail instability at Tevatron SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Tevatron performance suffers from a coherent transverse instability. Experimental and theoretical studies allow identifying the instability as a weak head-tail, driven by the short-range wake fields in presence of the space charge. Growth rates and coherent tune shifts are measured at injection of single high-intensity proton bunch using a fast strip-line pickup. Landau damping through the octupole-generated betatron tune spread for all unstable head-tail modes has been demonstrated. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ivanov, PM (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 8 Z9 8 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3062 EP 3064 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600979 ER PT B AU Ng, KY AF Ng, KY BE Chew, J Lucas, P Webber, S TI Impedances of Tevatron separators SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The impedances of the Tevatron separators are revisited and are found to be negligibly small in the few hundred MHz region, except for resonances at 22.5 MHz. The latter are contributions from the power cables which may drive head-tail instabilities if the bunch is long enough. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ng, KY (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3065 EP 3067 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600980 ER PT B AU Pasquinelli, RJ Cullerton, E Sun, D Tinsley, D Seifrid, P Peterson, D Steimel, J AF Pasquinelli, RJ Cullerton, E Sun, D Tinsley, D Seifrid, P Peterson, D Steimel, J BE Chew, J Lucas, P Webber, S TI A 1.7 GHz waveguide Schottky detector system SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A 1.7 GHz waveguide Schottky detector system has been designed and built for each of the Fermilab Tevatron and Recycler accelerators. The waveguide detector is designed to measure the betatron sideband and longitudinal Schottky signals of the accelerators at a frequency high enough to avoid coherent effects. Two detectors are used for each machine, one for horizontal and one for vertical betatron signals. Each detector is bi-directional providing both proton and antiproton signals. This paper describes the details of the waveguide design and construction as well as the design of the electronic system of the detector. Sensitivity calculations and bandwidth models are included. The electronic system utilizes down conversion to frequencies less than 10 MHz, so that the signals may be analyzed by standard instrumentation, such as a Vector Signal Analyzer. The electronic system includes electronic gates to measure single or multiple bunches of protons or antiprotons with the RF as a source for tracking up and down energy ramps. The electronic system also includes a continuous beam emittance monitor. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Pasquinelli, RJ (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 3 TC 4 Z9 4 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3068 EP 3070 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600981 ER PT B AU Tan, CY Steimel, J AF Tan, CY Steimel, J BE Chew, J Lucas, P Webber, S TI The Tevatron bunch by bunch longitudinal dampers SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We describe in this paper the Tevatron bunch by bunch dampers. The goal of the dampers is to stop the spontaneous longitudinal beam size blowup of the protons during a store. We will go through the theory and also show the measured results during the commissioning of this system. The system is currently operational and have stopped the beam blowups during a store. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Tan, CY (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 2 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3071 EP 3073 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600982 ER PT B AU Tan, CY Steimel, J AF Tan, CY Steimel, J BE Chew, J Lucas, P Webber, S TI The Tevatron transverse dampers SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We describe in this paper the Tevatron transverse dampers. The goal of these dampers is to keep the beam stable when we operate at lower chromaticities. The reason for operating at lower chromaticities is to improve the beam lifetime. However, the beam becomes unstable at low chromaticies and thus dampers are required. Also included in this paper are the damper communissioning notes and their real-life performance. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Tan, CY (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 2 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3074 EP 3076 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600983 ER PT B AU Colestock, P Beltran, C Browman, A Gilpatrick, D Macek, R McCrady, R Neri, F Rybarcyk, L Spickermann, T Schulze, M AF Colestock, P Beltran, C Browman, A Gilpatrick, D Macek, R McCrady, R Neri, F Rybarcyk, L Spickermann, T Schulze, M BE Chew, J Lucas, P Webber, S TI An experimental study of microwave stability near transition in the PSR SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We have undertaken a study of microwave stability in the PSR storage ring under a variety of beam conditions near transition, including variable intensity and machine impedance, which can be independently controlled in the PSR. Results indicate that the general features of a linear stability model are valid, namely that the instability threshold becomes very small sufficiently close to transition. In addition, many nonlinear features are apparent and the results suggest an extended operating regime is possible with saturated, but otherwise benign, longitudinal fluctuations. Details of the linear model experimental results and corresponding simulations will be presented. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Colestock, P (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3086 EP 3088 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600987 ER PT B AU Macek, RJ Browman, A Borden, M Fitzgerald, D McCrady, R Spickermann, T Zaugg, T AF Macek, RJ Browman, A Borden, M Fitzgerald, D McCrady, R Spickermann, T Zaugg, T BE Chew, J Lucas, P Webber, S TI Status of the experimental studies of the electron cloud at the Los Alamos Proton Storage Ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The electron cloud (EC) at the Los Alamos Proton Storage Ring (PSR) has been studied extensively for the past several years with an overall aim to identify and measure its important characteristics, the factors that influence these characteristics, and to relate these to the two-stream (e-p) transverse instability long observed at PSR. Some new results since PAC2001 are presented. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Macek, RJ (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM macek@lanl.gov NR 6 TC 4 Z9 4 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3089 EP 3091 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600988 ER PT B AU Wang, TSF AF Wang, TSF BE Chew, J Lucas, P Webber, S TI A three-dimensional kinetic theory of continuous-beam stability SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID CHARGED-PARTICLE BEAMS; HEAVY-ION FUSION; TEMPERATURE ANISOTROPY; RECENT PROGRESS; SIMULATION; EQUILIBRIUM AB This work is a three-dimensional stability study based on the modal analysis for a continuous beam with a Kapchinskij-Vladimirskij (KV) distribution. The analysis is carried out self-consistently within the context of linearized Vlasov-Maxwell equations and electrostatic approximation. The emphasis is on investigating the coupling between longitudinal and transverse perturbations in the high-intensity region. The interaction between the transverse modes supported by the KV distribution and those modes sustainable by the cold beam is examined. We found two classes of coupling modes that would not exist if the longitudinal and the transverse perturbations are treated separately. The effects of wall impedance on beam stability is also studied and numerical examples are presented. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Wang, TSF (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3092 EP 3094 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600989 ER PT B AU Wang, TSF AF Wang, TSF BE Chew, J Lucas, P Webber, S TI A numerical study of bunched beam transverse e-p instability based on the centroid model SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In a recent theoretical study of the transverse electron-proton (e-p) instability, an asymptotic solution has been found for the equations describing the centroid motion of the traversing proton bunch and the stationary background electrons. [1] It was shown that the combination of finite proton bunch length, non-uniform proton line density, and the single-pass e-p interaction cause the instability to evolve intricately in space and time even in the linear regime. This paper reports a numerical study of the e-p instability based on the same centroid equations. The purpose of the work is to compare the numerical solution with the analytic solution and to use the numerical approach to investigate the early development of the instability not covered by the asymptotic solution. In particular, the instability threshold and the initial growth of the instability are studied for various proton-beam conditions, fraction of charge neutralization, and initial perturbations. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Wang, TSF (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3095 EP 3097 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600990 ER PT B AU Fawley, WM Eylon, S Briggs, R AF Fawley, WM Eylon, S Briggs, R BE Chew, J Lucas, P Webber, S TI RF impedance measurements on the DARHT-II accelerator intercell assembly SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We report upon recent experimental measurements made of RF properties of the intercell assembly of the second axis accelerator[l] of Dual Axis Radiographic Hydrodynamic Test (DARHT) facility at LANL The intercells provide both pumping and diagnostic access to the main DARHT-II beamline. Their design includes a pumping plenum separated from the main beam pipe by return current rods together with RF shielding provided by a copper-coated stainless steel mesh. Measurements using the twin lead technique (see Ref. [2]) at low frequencies (f less than or equal to 200 MHz) suggest a constant value for the ratio eta of the radial and azimuthal magnetic field components to which the transverse impedance is linearly related. We find that these results compare favorably to predictions from a simple analytic, lumped circuit model which includes the effects of the mesh and return current rods. We also present RF loop-to-loop frequency scans above beam pipe cutoff (similar to600 MHz) showing the existence of many RF modes with relatively high Q's. C1 LBNL, Berkeley, CA 94720 USA. RP Fawley, WM (reprint author), LBNL, Berkeley, CA 94720 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3098 EP 3100 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600991 ER PT B AU Davidson, RC Qin, H Shvets, G AF Davidson, RC Qin, H Shvets, G BE Chew, J Lucas, P Webber, S TI Instability driven by wall impedance in intense charged particle beams SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The linearized Vlasov-Maxwell equations are used to investigate properties of the wall-impedance-driven instability for a long charge bunch with flat-top density profile propagating through a cylindrical pipe with radius r(w) and wall impedance Z(w). The stability analysis is valid for general value of the normalized beam intensity S-b = w(pb)(2)/2gamma(b)(2)w(betaperpendicular to)(2) in the interval 0 < S-b < 1. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Davidson, RC (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3117 EP 3119 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600998 ER PT B AU Qin, H Davidson, RC Startsev, EA AF Qin, H Davidson, RC Startsev, EA BE Chew, J Lucas, P Webber, S TI delta f simulation studies of the ion-electron two-stream instability in IBX SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The ion-electron two-stream instabilityis studied numerically for the high intensity heavy ion beams envisioned in the Integrated Beam Experiment (IBX). We consider a 1.7 MeV K+ beam with 0.25 microcoulombs/m line density propagating through a small background electron population. The detailed linear properties of the ion-electron two-stream instability are studied using a 3D low-noise delta-f particle simulation method implemented in the Beam Equilibrium, Stability and Transport (BEST) code. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Qin, H (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 21 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3120 EP 3122 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498600999 ER PT B AU Startsev, EA Davidson, RC Qin, H AF Startsev, EA Davidson, RC Qin, H BE Chew, J Lucas, P Webber, S TI Kinetic studies of temperature anisotropy instability in intense charged particle beams SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB This paper extends previous analytical and numerical studies [E. A. Startsev, R. C. Davidson and H. Qin, Phys. Plasmas 9, 3138 (2002)] of the stability properties of intense nonneutral charged particle beams with large temperature anisotropy (T-perpendicular tob >> T-parallel tob) to allow for non-axisymmetric perturbations with theta/thetatheta not equal theta. The most unstable modes are identified, and their eigenfrequencies and radial mode structure are determined. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Startsev, EA (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3123 EP 3125 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601000 ER PT B AU Bane, K Decker, FJ Emma, P Hendrickson, L Krejcik, P O'Connell, CL Schlarb, H Welch, J Woodley, M AF Bane, K Decker, FJ Emma, P Hendrickson, L Krejcik, P O'Connell, CL Schlarb, H Welch, J Woodley, M BE Chew, J Lucas, P Webber, S TI Measurement of the longitudinal wakefield in the SLAC linac for extremely short bunches SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Linac Coherent Light Source (LCLS) [1] is an x-ray FEL project with a 1-nC electron bunch compressed to an rms length of 20 microns at 4.5 GeV, accelerated in 500 meters of SLAC linac to 15 GeV, and then injected into an undulator to generate SASE radiation. The longitudinal wakefield generated by the short bunch in the (S-band) linac is very strong, and is relied upon to cancel the energy chirp left in the beam after bunch compression. Up to now, both the average [2] and the shape [3] of the longitudinal wake of the SLAC linac have been measured and confirmed using bunches ranging down to an rms 500-microns in length. The recent installation of a chicane in the SLAC linac for the Sub-Picosecond Photon Source (SPPS) [4, 5, 6], however, allows compression of a 3.4-nC bunch down to 50 mum rrns length. We present measurements of the average wakefield, for bunch lengths down to this, LCLS-type scale, and compare with theory. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Bane, K (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3126 EP 3128 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601001 ER PT B AU Emma, P Decker, FJ Krejcik, P O'Connell, CL Woodley, M Schlarb, H Stulle, F AF Emma, P Decker, FJ Krejcik, P O'Connell, CL Woodley, M Schlarb, H Stulle, F BE Chew, J Lucas, P Webber, S TI Measurements of transverse emittance growth due to coherent synchrotron radiation in the SLAC SPPS bunch compressor chicane SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A four-dipole bunch compressor chicane has recently been installed in the SLAC linac at 9 GeV and is capable of compressing a 3.4-nC electron bunch to an rms length of 50 microns, resulting in a peak current of nearly 10 kA [1]. The electron bunch is extracted from a damping ring with normalized horizontal emittance of similar to 30 mum. We present preliminary measurements of the initial and final emittance in the chicane and compare these to 1D and 3D calculations of the effects of coherent synchrotron radiation (CSR). C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Emma, P (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3129 EP 3131 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601002 ER PT B AU Heifets, S Stupakov, G AF Heifets, S Stupakov, G BE Chew, J Lucas, P Webber, S TI Single-mode coherent synchrotron radiation instability SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Heifets, S (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3132 EP 3134 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601003 ER PT B AU Heifets, S Stupakov, G AF Heifets, S Stupakov, G BE Chew, J Lucas, P Webber, S TI Nonlinear regime of a single-mode CSR instability SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID SATURATION C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Heifets, S (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3135 EP 3137 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601004 ER PT B AU Huang, Z Borland, M Emma, P Kim, KJ AF Huang, Z Borland, M Emma, P Kim, KJ BE Chew, J Lucas, P Webber, S TI Effects of linac wakefield on CSR microbunching in the Linac Coherent Light Source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The design of the Linac Coherent Light Source (LCLS) requires two-stage bunch compression for stability against timing and charge jitters. Coherent synchrotron radiation (CSR) induced in these bunch compressors can drive a microbunching instability that may degrade the beam brightness. In this paper, we study effects of the longitudinal wakefield in the accelerator on this instability. We show that significant energy modulation can be accumulated in the linac through the geometrical wakefield and can enhance the CSR microbunching in these compressors. Analytical calculations are compared with numerical simulations to evaluate the gain of microbunching for the entire LCLS accelerator system. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Huang, Z (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM zrh@slac.stanford.edu NR 15 TC 4 Z9 4 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3138 EP 3140 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601005 ER PT B AU McIntosh, P Akre, R Anderson, D DeBarger, S Dormiani, M Fox, J Jobe, K Schwarz, H Teytelman, D Wienands, U Young, A Marcellini, F Tobiyama, M AF McIntosh, P Akre, R Anderson, D DeBarger, S Dormiani, M Fox, J Jobe, K Schwarz, H Teytelman, D Wienands, U Young, A Marcellini, F Tobiyama, M BE Chew, J Lucas, P Webber, S TI An over-damped cavity longitudinal kicker for the PEP-II LER SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Both rings of PEP-II use drift tube kickers in the longitudinal bunch-by-bunch feedback system. Efforts are now underway to increase the stored beam currents and luminosity of PEP-II, and beam-induced heating of these structures, particularly in the Low Energy Ring (LER) is of concern. An alternative kicker design based on the over-damped cavity kicker, first developed by INFN-Frascati is being built for PEP-II. This low loaded Q (or wide bandwidth) structure is fed by a network of ridged waveguides coupled to a simple pill-box cavity. Beam induced RF power is also coupled out of the cavity to external loads, so that the higher order modes (HOMs) excited in the structure are well-damped. This paper details the kicker design for PEP-II and discusses some of the design trade-offs between shunt impedance and bandwidth, as well as the influence of the feedthroughs on the kicker parameters. Estimates of the expected power deposition in the cavity are also provided. C1 SLAC, Menlo Pk, CA 94025 USA. RP McIntosh, P (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3141 EP 3143 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601006 ER PT B AU Warnock, R Venturini, M AF Warnock, R Venturini, M BE Chew, J Lucas, P Webber, S TI Evolving bunch and retardation in the impedance formalism SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The usual expression for the longitudinal wake field in terms of the impedance is exact only for the model in which the source of the field is a rigid bunch. To account for a deforming bunch one has to invoke the complete impedance, a function of both wave number and frequency. A computation of the corresponding wake field would be expensive, since it would involve integrals over frequency and time in addition to the usual sum over wave number. We treat the problem of approximating this field in an example of current interest, the case of coherent synchrotron radiation (CSR) in the presence of shielding by the vacuum chamber. C1 SLAC, Stanford, CA 94309 USA. RP Warnock, R (reprint author), SLAC, Stanford, CA 94309 USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3144 EP 3146 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601007 ER PT B AU Towne, N AF Towne, N BE Chew, J Lucas, P Webber, S TI Simulated growth rates for single-bunch instabilities driven by a resistive impedance SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Vlasov simulations of instabilities driven by resistive impedance are used to determine growth rates of single-bunch instabilities. A method for measuring synchrotron tunes and growth rates from simulated synchrotron side-bands is described. Simulated growth rates are compared with Oide's calculation [K. Oide, Part. Accel. 51, 43 (1995)]. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Towne, N (reprint author), Brookhaven Natl Lab, Bldg 725B, Upton, NY 11973 USA. NR 5 TC 0 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3168 EP 3170 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601015 ER PT B AU Pellico, WA Wildman, DW AF Pellico, WA Wildman, DW BE Chew, J Lucas, P Webber, S TI Booster's coupled bunch damper upgrade SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A new narrowband active damping system for longitudinal coupled bunch (CB) modes in the Fermilab Booster has recently been installed and tested. In the past, he Booster active damper system consisted of four independent front-ends. The summed output was distributed to the 18, h=84 RF accelerating cavities via the RF fan-out sysitem. There were several problems using the normal fan-out system to deliver the longitudinal feedback RF. The high power RF amplifiers normally operate from 37 MHz to 53 MHz whereas the dampers operate around 83 MHz. Daily variations in the tuning of the RF stations created tuning problems for the longitudinal damper system. The solution was to build a dedicated narrowband, Q=10, 83 MHz cavity powered with a new 3.5kW solid-state amplifier. The cavity was installed in June 2002 and testing of the amplifier and damper front-end began in August 2002. A significant improvement has been made in both operational stability and high intensity beam damping. At present there are five CB modes being damped and a sixth mode module is being built. The new damper hardware is described and data showing the suppression of the coupled-bunch motion at high intensity is presented. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Pellico, WA (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3177 EP 3179 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601018 ER PT B AU Harkay, KC Lolacono, L Rosenberg, RA AF Harkay, KC Lolacono, L Rosenberg, RA BE Chew, J Lucas, P Webber, S TI Studies of a generalized beam-induced multipacting resonance condition SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB At certain bunch intensities and bunch spacings, beam-induced multipacting (BIM) was observed during experiments performed at the Advanced Photon Source. Dedicated diagnostics known as retarding-field analyzers (RFAs) were used to directly measure the electron flux on the vacuum chamber walls. The peak signals were observed at a bunch spacing other than that predicted in the classical form of BIM, which assumes cold secondary electron emission. Using a simple computer model, we studied the effect of including an energy distribution for the emitted secondary electrons. We found that the experimental data can be explained by a resonance condition in which the secondary electron energy and surface emissivity properties are included. Results for positron beams are presented. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Harkay, KC (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3183 EP 3185 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601020 ER PT B AU Wang, D Ben-Zvi, I Chang, XY Kewisch, J Montag, C AF Wang, D Ben-Zvi, I Chang, XY Kewisch, J Montag, C BE Chew, J Lucas, P Webber, S TI Simulation of magnetized beams SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The angular momentums of particles in a bunch of beam are of importance in many applications. Usually the angular momentums are related to the end field of solenoids. In electron cooling facilities the solenoid fields are widely used as they are found very helpful not only in focusing and guiding the charge paticle beams but also in enhancing the cooling rates. The RHIC electron cooler is a chanllenging project because it requires a high performance facility including a solenoid with high quality strong field (1 Tesla). Issues cause by the end fields of the solenoid have been studied to minimize the extra temperature and coherent motions. In this paper we report recent results in simulating the angular momentums of the electron beam and its application on the RHIC electron cooler. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Wang, D (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3186 EP 3188 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601021 ER PT B AU Amundson, J Spentzouris, P AF Amundson, J Spentzouris, P BE Chew, J Lucas, P Webber, S TI Synergia: A hybrid, parallel beam dynamics code with 3D space charge SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We describe Synergia, a hybrid code developed under the DOE SciDAC-supported Accelerator Simulation Program. The code combines and extends the existing accelerator modeling packages IMPACT and beamline/mxyzptlk. We discuss the design and implementation of Synergia, its performance on different architectures, and its potential applications. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Amundson, J (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3195 EP 3197 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601024 ER PT B AU Chan, KCD Ekdahl, CA Chen, YJ Hughes, TP AF Chan, KCD Ekdahl, CA Chen, YJ Hughes, TP BE Chew, J Lucas, P Webber, S TI Simulation results of corkscrew motion in DARHT-II SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID LINEAR ACCELERATORS AB DARHT-II, the second axis of the Dual-Axis Radiographic Hydrodynamics Test Facility, is being commissioned. DARHT-II is a linear induction accelerator producing 2-microsecond electron beam pulses at 20 MeV and 2 kA. These 2-microsecond pulses will be chopped into four short pulses to produce time resolved x-ray images. Radiographic application requires the DARHT-II beam to have excellent beam quality, and it is important to study various beam effects that may cause quality degradation of a DARHT-II beam. One of the beam dynamic effects under study is "corkscrew" motion. For corkscrew motion, the beam centroid is deflected off axis due to misalignments of the solenoid magnets. The deflection depends on the beam energy variation, which is expected to vary by +/-0.5% during the "flat-top" part of a beam pulse. Such chromatic aberration will result in broadening of beam spot size. In this paper, we will report simulation results of our study of corkscrew motion in DARHT-II. Sensitivities of beam spot size to various accelerator parameters and the strategy for minimizing corkscrew motion will be described. Measured magnet misalignment is used in the simulation. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Chan, KCD (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 6 TC 2 Z9 2 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3210 EP 3212 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601029 ER PT B AU Steier, C Robin, D Wolski, A AF Steier, C Robin, D Wolski, A BE Chew, J Lucas, P Webber, S TI Coupling correction and beam dynamics at ultralow vertical emittance in the ALS SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB For synchrotron light sources and for damping rings of linear colliders it is important to be able to minimze the vertical emittance and to correct the spurious vertical dispersion. This allows one to maximize the brightness and/or the luminosity. A commonly used tool to measure the skew error distribution is the analysis of orbit response matrices using codes like LOCO. Using the new Matlab version of LOCO and 18 newly installed power supplies for individual skew quadrupoles at the ALS the emittance ratio could be reduced below 0.1% at 1.9 GeV yielding a vertical emittance of about 5 pm. At those very low emittances, additional effects like intra beam scattering become more important, potentially limiting the minimum emittance for machine like the damping rings of linear colliders. C1 LBNL, Berkeley, CA 94720 USA. RP Steier, C (reprint author), LBNL, Berkeley, CA 94720 USA. EM CSteier@lbl.gov OI Wolski, Andrzej/0000-0002-5057-5588 NR 6 TC 4 Z9 4 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3213 EP 3215 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601030 ER PT B AU Pivi, M Raubenheimer, TO Furman, MA AF Pivi, M Raubenheimer, TO Furman, MA BE Chew, J Lucas, P Webber, S TI Recent electron-cloud simulation results for the Main Damping Rings of the NLC and TESLA linear colliders SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In the beam pipe of the Main Damping Ring (MDR) of the Next Linear Collider (NLC), ionization of residual gasses and secondary emission give rise to an electron-cloud which stabilizes to equilibrium after few bunch trains. In this paper, we present recent computer simulation results for the main features of the electron cloud at the NLC and preliminary simulation results for the TESLA main damping rings, obtained with the code POSINST that has been developed at LBNL, and lately in collaboration with SLAC, over the past 7 years. Possible remedies to mitigate the effect are also discussed. We have recently included the possibility to simulate different magnetic field configurations in our code including solenoid, quadrupole, sextupole and wiggler. C1 SLAC, Menlo Pk, CA 94025 USA. RP Pivi, M (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3219 EP 3221 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601032 ER PT B AU Pivi, M Furman, MA AF Pivi, M Furman, MA BE Chew, J Lucas, P Webber, S TI Mitigation of the electron-cloud effect in the PSR and SNS Proton Storage Rings by tailoring the bunch profile SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB For the storage ring of the Spallation Neutron Source (SNS) at Oak Ridge, and for the Proton Storage Ring (PSR) at Los Alamos, both with intense and very long bunches, the electron cloud develops primarily by the mechanism of trailing-edge multipacting. We show, by means of simulations for the PSR, how the resonant nature of this mechanism may be effectively broken by tailoring the longitudinal bunch profile at fixed bunch charge, resulting in a significant decrease in the electron-cloud effect. We briefly discuss the experimental difficulties expected in the implementation of this cure. C1 SLAC, Menlo Pk, CA 94025 USA. RP Pivi, M (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3222 EP 3224 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601033 ER PT B AU Stupakov, G Krinsky, S AF Stupakov, G Krinsky, S BE Chew, J Lucas, P Webber, S TI Derivation of FEL gain using wakefield approach SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID FREE-ELECTRON LASER; EMISSION AB We describe the one-dimensional SASE FEL instability using the wake approach. First, we obtain an expression for the longitudinal 1-D wake in a helical undulator. We then show that taking into account the retardation effect in the Vlasov equation with the proper wake leads to the correct result for the FEL instability, in agreement with the traditional theory. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Stupakov, G (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3225 EP 3227 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601034 ER PT B AU Wu, JH Wang, D Zhou, F AF Wu, JH Wang, D Zhou, F BE Chew, J Lucas, P Webber, S TI Coherent synchrotron radiation effects in the electron cooler for RHIC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Coherent Synchrotron Radiation (CSR) could be a concern in many modem accelerator projects. In the proposed electron-cooling project for the Relativistic Heavy Ion Collider (RHIC), the electron cooler is designed to cool 100 GeV/nucleon bunched ion-beam using 55 MeV electrons. The electron bunch length will be on the order of cm, and the charge per bunch would be around 5 - 10 nC. We study the CSR effect in this paper. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Wu, JH (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM jhwu@SLAC.Stanford.EDU; wangd@bnl.gov; zhouf@bnl.gov NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3228 EP 3230 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601035 ER PT B AU Wu, JH Stupakov, GV Raubenheimer, TO Huang, ZR AF Wu, JH Stupakov, GV Raubenheimer, TO Huang, ZR BE Chew, J Lucas, P Webber, S TI Impact of the wiggler coherent synchrotron radiation impedance on the beam instability SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Previous studies of the (Coherent Synchrotron Radiation) CSR induced longitudinal instability have been made using the CSR impedance due to dipole magnets, however, many storage rings include long wigglers where a large fraction of the synchrotron radiation is emitted. In this paper, the instability due to the CSR impedance from a wiggler is studied assuming a large wiggler parameter K. The primary consideration is a low frequency microwave-like instability, which arises near the pipe cut-off frequency. Finally, the optimization of the relative fraction of damping due to the wiggler systems is discussed for the damping rings in future linear colliders. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Wu, JH (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3231 EP 3233 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601036 ER PT B AU Tennant, C Chao, Y Douglas, D Freyberger, A Tiefenback, M AF Tennant, C Chao, Y Douglas, D Freyberger, A Tiefenback, M BE Chew, J Lucas, P Webber, S TI Beam characterization in the CEBAF-ER experiment SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Energy recovering a 1 GeV beam through CEBAF (Continuous Electron Beam Accelerator Facility) presents many operational challenges. As a result, it is important to have a quantitative understanding of the beam behavior throughout the machine. The emittance provides a figure of merit in this context inasmuch as it characterizes the extent to which beam quality is preserved during energy recovery. A solution to the problem of obtaining a high-resolution emittance measurement in the extraction region of the CEBAF-ER experiment (CEBAF with Energy Recovery) is presented. The method makes use of a single scanning quadrupole and a downstream wire scanner. In addition, by using multiple wire scans, a. scheme for measuring the emittance and momentum spread of the first pass beam in the injector and Arcs 1 and 2 was implemented. And by using a novel technique employing wire scans in conjunction with PMTs (Photomultiplier Tubes) to accurately measure the beam profile at the dump, we can quantify the extent to which we have successfully transported beam to the energy recovery dump. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Tennant, C (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3243 EP 3245 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601040 ER PT B AU Yunn, BC AF Yunn, BC BE Chew, J Lucas, P Webber, S TI A beam breakup instability in a recirculating linac caused by a quadrupole mode SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID ENERGY RECOVERY AB Following the successful demonstration of energy recovery in a recirculating linac with superconducting cavities at the Jefferson Lab FEL[1], several ambitious electron accelerator projects have recently been proposed or are in study for either a light source or a collider based on this novel technology. These projects all intend to utilize a high quality linac electron beam generated with an average beam current typically in the range of 100's of mA. As is well known, a recirculating linac suffers from a beam breakup instability of a regenerative type caused by a Higher Order Mode (HOM) in an accelerating cavity, which can have a very high Q (quality factor) when superconducting. The instability can degrade the beam quality significantly. We investigate one such beam breakup instability in a recirculating linac that could arise as a result of high Q quadrupole modes excited in the cavity. In a simple model we derive a relation which allows one to deduce the upper limit on tolerable Q values for such modes. The results should provide a useful guide in setting the HOM damping requirement among others. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Yunn, BC (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3246 EP 3248 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601041 ER PT B AU Kahn, SA Carroll, A Diwan, MV Gallardo, JC Kirk, H Scarlett, C Simos, N Viren, B Zhang, W AF Kahn, SA Carroll, A Diwan, MV Gallardo, JC Kirk, H Scarlett, C Simos, N Viren, B Zhang, W BE Chew, J Lucas, P Webber, S TI Focusing horn system for the BNL very long baseline neutrino oscillation experiment SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB This paper describes the focusing horn system for the proposed very long baseline neutrino oscillation experiment using a neutrino beam from BNL to an underground facility such as the Homestake Mine in South Dakota. The proposed experiment uses a I MW upgraded AGS. In order to achieve this performance the AGS will operate with a cycle time of 2.5 Hz and 8.9x10(13) protons on target at 28 GeV. This paper discusses the design criteria of a horn system necessary to handle this intense beam and the optical geometry to achieve the desired flux distribution at the detector. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kahn, SA (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. OI Gallardo, Juan C/0000-0002-5191-3067 NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3255 EP 3257 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601044 ER PT B AU Chacon-Golcher, E Kwan, JW Morse, EC AF Chacon-Golcher, E Kwan, JW Morse, EC BE Chew, J Lucas, P Webber, S TI Diffusion of alkali species in porous tungsten substrates used in contact-ionization sources SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Contact ionization (doped) sources used in current Heavy Ion Fusion (HIF) experiments consist of a porous tungsten substrate doped with an alkali carbonate. During the early stages of the heating cycle (T similar to 600 degreesC, the carbonate breaks down and releases the alkali atoms that then diffuse through the substrate. At the emitter surface there is a balance between the fast desorption. rate of the alkali atoms (mostly as neutrals) and the slower replenishment rate from the substrate by diffusion. Time-resolved measurements of neutral particle evaporation rates at the emitter surface have been used to estimate the effective diffusion coefficient (D) that characterizes the migration of alkali species in the substrate. These estimates are consistent with the observed source lifetimes (tens of hrs.) and establish the alkali migration in the bulk as a diffusion-limited process. The measurements suggest that the faster migration rates (D approximate to 10(-5) - 10(-6) cm(2)/s) occur early during the heating cycle when the dominant species are the neutral alkali atoms. At operating temperatures there is a slower migration rate (D approximate to 10(-7) cm(2)/s) due to the dominance of ions, which diffuse by a slower surface diffusion process. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Chacon-Golcher, E (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3291 EP 3293 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601056 ER PT B AU Baca, D Kwan, JW Wu, JK AF Baca, D Kwan, JW Wu, JK BE Chew, J Lucas, P Webber, S TI Fabrication of large diameter aluminosilicate K+ sources SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Alumino-silicate sources that are used for Heavy Ion Fusion (HIF) drivers can produce high current beams, and have a long lifetime, typically many months of normal operation. The usual ion source diameter is about 10 cm with a curved emitting surface. Recently we achieved reliable fabrication of such large diameter sources with high quality alumino-silicate coating on tungsten substrates. The effects of substrate porosity, powder size distribution, coating technique, particle packing density, drying, and heat firing temperature have been investigated. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Baca, D (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. NR 4 TC 7 Z9 7 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3294 EP 3296 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601057 ER PT B AU Kwan, JW Vay, JL Bieniosek, FM Halaxa, E Westenskow, G AF Kwan, JW Vay, JL Bieniosek, FM Halaxa, E Westenskow, G BE Chew, J Lucas, P Webber, S TI Beam optics of a 10-cm diameter high current heavy ion diode SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID FUSION; INJECTOR AB Typically a large diameter surface ionization source is used to produce > 0.5 A K+ current with emittance < 1 pi-mm-mrad for heavy ion fusion experiments. So far we have observed aberrations that are slightly different from those predicted by computer simulations, We have now set up an experiment to study in detail the beam optics of such a large diameter ion diode and to benchmark the simulation code. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Kwan, JW (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3297 EP 3299 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601058 ER PT B AU Westenskow, G Hall, RP Halaxa, E Kwan, JW AF Westenskow, G Hall, RP Halaxa, E Kwan, JW BE Chew, J Lucas, P Webber, S TI Characterization of an RF-driven plasma ion source for heavy ion fusion SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We are testing a high-current-density high-brightness Argon-Ion Source for Heavy Ion Fusion applications. The 100-kV 20-mus source has produced up to 5 mA of Ar+ in a single beamlet. The extraction current density is 100 mA/cm(2). We have measured the emittance of the beamlet, and the fraction of Ar++ ions under several operating conditions. We present measurements of the extracted current density as a function of RF power and gas pressure (similar to 2 mT), current density uniformity, and energy dispersion (due to charge exchange). We are testing a 80-kV 61-hole multi-beamlet array that will produce a total current > 200 mA. In the current experiments the beamlets are not merged into a single beam. A 500-kV experiment where the beamlets will be merged to a produce 0.5-A beam is being planned. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Westenskow, G (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3300 EP 3302 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601059 ER PT B AU Welton, RF Stockli, MP Murray, SN Keller, R AF Welton, RF Stockli, MP Murray, SN Keller, R BE Chew, J Lucas, P Webber, S TI Development and status of the SNS ion source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID SPALLATION NEUTRON SOURCE AB The ion source for the Spallation Neutron Source (SNS) is a radio-frequency, multicusp source designed to deliver 45 mA of H- with a normalized rms emittance of less than 0.27 pi min mrad to the SNS accelerator. The ion source-designed, constructed, and commissioned at Lawrence Berkeley National Laboratory (LBNL)-satisfies the basic requirements of commissioning and early operation of the SNS accelerator. To improve reliability of the ion source and consequently the availability of the SNS accelerator, we are undertaking a comprehensive ion source development program at Oak Ridge National Laboratory (ORNL). To date, this program has focused on design and development of internal and external ion source antennas having long operational lifetimes, development and characterization of efficient RF matching networks, simulation and measurement of the extracted ion beam and, optimization of the beam extraction and Cs systems. This report will outline progress made in some of these areas as well as summarize the current state of the SNS ion source discussing specifically source performance during front end re-commissioning at ORNL. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP Welton, RF (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37830 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3306 EP 3308 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601061 ER PT B AU Grisham, LR Hahto, SK Hahto, ST Kwan, JW Leung, KN AF Grisham, LR Hahto, SK Hahto, ST Kwan, JW Leung, KN BE Chew, J Lucas, P Webber, S TI Proof-of-concept experiments for negative ion driver beams for heavy ion fusion SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Negative halogen ion beams have recently been proposed as heavy ion fusion drivers. They would avoid the problem of electron accumulation in positive ion beams, and could be efficiently photodetached to neutrals if desired [1]. Initial experiments using chlorine produced a current density of 45 mA/cm(2) of 99.5% atomic negative Cl with an e/Cl- ratio as low as 7:1 and good emittance. C1 Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Grisham, LR (reprint author), Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3309 EP 3311 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601062 ER PT B AU Ivanov, V Krasnvkh, A Scheitrum, G Sprehn, D Ives, L Miram, G AF Ivanov, V Krasnvkh, A Scheitrum, G Sprehn, D Ives, L Miram, G BE Chew, J Lucas, P Webber, S TI 3D modeling activity for novel high power electron guns at SLAC SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The next generation of powerful electronic devices requires new approaches to overcome the known limitations of existing tube technology. Multi-beam and sheet beam approaches are novel concepts for the high power microwave devices. Direct and indirect modeling methods are being developed at SLAC to meet the new requirements in the 3D modeling. The direct method of solving of Poisson's equations for the multi-beam and sheet beam guns is employed in the TOPAZ 3D tool. The combination of TOPAZ 2D and EGUN (in the beginning) with MAFIA 3D and MAGIC 3D (at the end) is used in an indirect method to model the high power electron guns. Both methods complement each other to get reliable representation of the beam trajectories. Several gun ideas are under consideration at the present time. The collected results of these simulations are discussed. C1 SLAC, Menlo Pk, CA 94025 USA. RP Ivanov, V (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 2 TC 1 Z9 2 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3312 EP 3314 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601063 ER PT B AU Ivanov, V Krasny, A Scheitrum, G Jensen, A AF Ivanov, V Krasny, A Scheitrum, G Jensen, A BE Chew, J Lucas, P Webber, S TI An improved version of TOPAZ 3D SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB An improved version of the TOPAZ 3D gun code is presented as a powerful tool for beam optics simulation. In contrast to the previous version of TOPAZ 3D, the geometry of the device under test is introduced into TOPAZ 3D directly from a CAD program, such as Solid Edge or AutoCAD. In order to have this new feature, an interface was developed, using the GiD software package as a meshing code. The article describes this method with two models to illustrate the results. C1 SLAC, Stanford, CA 92025 USA. RP Ivanov, V (reprint author), SLAC, Stanford, CA 92025 USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3315 EP 3317 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601064 ER PT B AU DeLong, J Brennan, JM Hayes, T Le, TN Smith, K AF DeLong, J Brennan, JM Hayes, T Le, TN Smith, K BE Chew, J Lucas, P Webber, S TI Topology for a DSP based beam control system in the AGS booster SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The AGS Booster supports beams of ions and protons with a wide range of energies on a pulse-by-pulse modulation basis. This requires an agile beam control system highly integrated with its controls. To implement this system digital techniques in the form of. Digital Signal Processors, Direct Digital Synthesizers, digital receivers and high speed Analog to Digital Converters are used. Signals from the beam and cavity pick-ups, as well as measurements of magnetic field strength in the ring dipoles are processed in real time. To facilitate this a multi-processor topology with high bandwidth data links is being designed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP DeLong, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3338 EP 3340 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601072 ER PT B AU DeLong, J Brennan, JM Hayes, T Le, TN Smith, K AF DeLong, J Brennan, JM Hayes, T Le, TN Smith, K BE Chew, J Lucas, P Webber, S TI A bunch to bucket phase detector using digital receiver rechnology SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Transferring high-speed digital signals to a Digital Signal Processor is limited by the 10 bandwidth of the DSP. A digital receiver circuit is used to translate high frequency RF signals to base-band. The translated output frequency is close to DC and the data rate can be reduced, by decimation, before transfer to the DSP. By translating both the longitudinal beam (bunch) and RF cavity pick-ups (bucket) to DC, a DSP can be used to measure their relative phase angle. The result can be used as an error signal in a beam control servo loop and any phase differences can be compensated. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP DeLong, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3341 EP 3343 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601073 ER PT B AU Smith, K Blaskiewicz, M Brennan, JM DeLong, J Heistermann, F Zaltsman, A Owens, TL AF Smith, K Blaskiewicz, M Brennan, JM DeLong, J Heistermann, F Zaltsman, A Owens, TL BE Chew, J Lucas, P Webber, S TI Progress on the SNS Ring LLRF control system SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The SNS Ring RF System[1,2] will comprise three h=1 (frev = 1.05 MHz) cavities and one h=2 cavity, each with individual digital LLRF control electronics. During each 1ms accumulation of 1 GeV protons in the SNS ring cycling at 60Hz, circulating intensity increases to 1.5E14 particles. This intensity translates to an average circulating current (at the end of accumulation) of 35A and a peak h=1 current of 50A. The LLRF system primary task is to regulate the phase and amplitude of the RF gap voltage in order to maintain a smooth bunch with minimum peak current and a sufficient beam free gap to accommodate the extraction kicker rise time. Maintaining stable control of the cavity-beam system with such intense beam loading is non-trivial, and to do so, the LLRF system will use a combination of techniques including cavity voltage I&Q feedback, beam current feed-forward compensation, dynamic tuning and cycle to cycle adaptive feedback. This paper describes the progress on the LLRF control system to date. C1 BNL, Upton, NY 11973 USA. RP Smith, K (reprint author), BNL, Upton, NY 11973 USA. NR 5 TC 0 Z9 0 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3344 EP 3346 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601074 ER PT B AU Dey, J Kourbanis, I Reid, J Steimel, J AF Dey, J Kourbanis, I Reid, J Steimel, J BE Chew, J Lucas, P Webber, S TI 53 MHz feedforward beam loading compensation in the Fermilab main injector SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB 53 MHz feedforward beam loading compensation is crucial to all operations of the Main Injector. Recently a system using a fundamental frequency down converter mixer, a digital bucket delay module and a fundamental frequency up converter mixer were used to produce a one-turn-delay feedforward signal. This signal was then combined with the low level RF signal to the cavities to cancel the transient beam induced voltage. During operation we have shown consistently over 20 dB reduction in side-band voltage around the fundamental frequency during Proton coalescing and over 14 dB; in multi-batch antiproton coalescing. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Dey, J (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 1 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3353 EP 3355 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601077 ER PT B AU Dey, J Kourbanis, I Steimel, J AF Dey, J Kourbanis, I Steimel, J BE Chew, J Lucas, P Webber, S TI 2.5 MHz feedforward beam loading compensation in the Fermilab main injector SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB There are five 2.5 MHz ferrite cavities (h = 28) in the Main Injector with an R/Q of 500 that are presently used for coalescing for the Tevatron. For use with the Fermilab Recycler, feedforward (FF) beam loading compensation (BLC) is required on these cavities because they will be required to operate at a net of 2 kV. Under current Recycler beam conditions, the beam-induced voltage is of this order. Recently a system using a digital bucket delay module operating at 53 MHz (h = 588) was used to produce a one-turn-delay feedforward signal. This signal was then combined with the low level RF signal to the 2.5 MHz cavities to cancel the beam induced voltage. During current operation we have shown consistently to operate with over a 20 dB reduction in beam loading. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Dey, J (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3356 EP 3358 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601078 ER PT B AU Regan, A Kasemir, K Kwon, S Power, J Prokop, M Shoaee, H Stettler, M Doolittle, L Ratti, A Champion, M Swanson, C AF Regan, A Kasemir, K Kwon, S Power, J Prokop, M Shoaee, H Stettler, M Doolittle, L Ratti, A Champion, M Swanson, C BE Chew, J Lucas, P Webber, S TI Newly designed field control module for the SNS SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The low-level RF (LLRF) control system for the Spallation Neutron Source has undergone some recent hardware changes. The intended Field and Resonance Control Module (FRCM) design has been re-vamped to minimize functionality and ease implementation. This effort spans a variety of disciplines, and requires parallel development with distinct interface controls. This paper will discuss the platform chosen, the design requirements that will be met, and the parallel development efforts ongoing. C1 LANL, Los Alamos, NM 87544 USA. RP Regan, A (reprint author), LANL, Los Alamos, NM 87544 USA. OI Champion, Mark/0000-0002-5742-2568 NR 4 TC 0 Z9 0 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3371 EP 3373 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601083 ER PT B AU Steier, C Biocca, A Domning, E Jacobson, S Portmann, G Scarvie, T Williams, E AF Steier, C Biocca, A Domning, E Jacobson, S Portmann, G Scarvie, T Williams, E BE Chew, J Lucas, P Webber, S TI Commissioning results of the fast orbit feedback at the ALS SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A new fast global orbit feedback system has been designed at the ALS and is in commissioning since last September. The system has two main purposes. The first is to meet the demands of some users for even improved short term orbit stability. The second is to enable the use of more sophisticated insertion device compensation schemes (e.g. tune, beta-beating, coupling) for fast moving insertion devices like elliptically polarizing undulators, without deteriorating the orbit stability. One feature of the fast orbit feedback (with 1 kHz update rate) is the use of standard computer and networking equipment. C1 LBNL, Berkeley, CA 94720 USA. RP Steier, C (reprint author), LBNL, Berkeley, CA 94720 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3374 EP 3376 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601084 ER PT B AU Champion, M Crofford, M Ma, H Piller, M Ratti, A Doolittle, L Monroy, M DeSantis, S Shoaee, H Kasemir, K Kwon, S Power, J Prokop, M Regan, A Stettler, M Thomson, D AF Champion, M Crofford, M Ma, H Piller, M Ratti, A Doolittle, L Monroy, M DeSantis, S Shoaee, H Kasemir, K Kwon, S Power, J Prokop, M Regan, A Stettler, M Thomson, D BE Chew, J Lucas, P Webber, S TI The spallation neutron source accelerator low level RF control system SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Spallation Neutron Source Low Level RF Team includes members from Lawrence Berkeley, Los Alamos, and Oak Ridge national laboratories. The Team is responsible for the development, fabrication and commissioning of 98 Low Level RF (LLRF) control systems for maintaining RF amplitude and phase control in the Front End (FE), Linac and High Energy Beam Transport (HEBT) sections of the SNS accelerator, a 1 GeV, 1.4 MW proton source. The RF structures include a radio frequency quadrupole (RFQ), rebuncher cavities, and a drift tube linac (DTL), all operating at 402.5 MHz, and a coupled-cavity linac (CCL), superconducting linac (SCL), energy spreader, and energy corrector, all operating at 805 MHz. The RF power sources vary from 20 kW tetrode amplifiers to 5 MW klystrons. A single control system design that can be used throughout the accelerator is under development and will begin deployment in February 2004. This design expands on the initial control systems that are currently deployed on the RFQ, rebuncher and DTL cavities. An overview of the SNS LLRF Control System is presented along with recent test results and new developments. C1 ORNL, Oak Ridge, TN USA. RP Champion, M (reprint author), ORNL, Oak Ridge, TN USA. OI Champion, Mark/0000-0002-5742-2568 NR 1 TC 2 Z9 4 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3377 EP 3379 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601085 ER PT B AU Owens, TL Smith, K Zaltsman, A AF Owens, TL Smith, K Zaltsman, A BE Chew, J Lucas, P Webber, S TI Control of heavily-beam-loaded SNS-ring cavities SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In each of four rf stations that make up the rf buncher system in the SNS accumulator ring, cavity voltage and phase are control led through a negative-feedback system employing digital electronics. With peak beam currents as high as 75 Amperes near the end of each 1.1 ms machine cycle, the rf cavities in the SNS ring are strongly driven by the beam. To provide adequate regulation of cavity fields in the presence of high SNS beam currents, basic feedback loop parameters are pushed to levels where stability becomes a major concern. This note presents a LabVIEW simulation of the ring rf system that demonstrates how Smith compensation can be used to mitigate the destabilizing effect of dead-time delay in the feedback loop and assure adequate regulation of cavity fields. A digital implementation of Smith compensation is outlined that could be incorporated into the LLRF system being provided by BNL. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP Owens, TL (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. NR 4 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3380 EP 3382 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601086 ER PT B AU Beckman, L Hassanpour, N Sapozhnikov, L Teytelman, D Fox, J AF Beckman, L Hassanpour, N Sapozhnikov, L Teytelman, D Fox, J BE Chew, J Lucas, P Webber, S TI Low-mode coupled bunch feedback channel for PEP-II SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Both the HER and LER of PEP-II use broadband longitudinal multi-bunch feedback systems which process all coupled-bunch modes in the machine spanning a 119 MHz bandwidth. Roughly I MHz of this bandwidth includes modes driven by impedance related to the RF cavity fundamental. The longitudinal modes within the cavity bandwidth are processed by the all-mode broadband systems, though the correction signal is applied to the beam via a path through the broadband kicker, as well as through a special woofer channel which uses the RF system to apply low-mode correction signals to the beam. As there are two correction paths, with differing group delay and frequency response, yet only one adjustable processing channel, it is difficult to get an optimal low-frequency ("woofer") response if the broadband feedback path is configured to best control HOM driven instabilities. A new low-mode processing channel has been designed to provide an independent means of providing the low-mode correction signal. It is a digital channel, operating at a 10 MHz sampling rate, and incorporating programmable 12 tap FIR control filters. This channel, implemented using EPLD technology, allows more optimal gain and phase adjustment of the woofer control path, with lower group delay allowing higher gain. This extra flexibility and higher gain will be useful in future high-current PEP-II operation. The design of the control channel is illustrated, and a possible control filter with system dynamics is described. C1 Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Beckman, L (reprint author), Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RI Hassanpour, Navid/N-2346-2016 NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3389 EP 3391 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601089 ER PT B AU Qiang, J Ryne, RD Sen, T Xiao, M AF Qiang, J Ryne, RD Sen, T Xiao, M BE Chew, J Lucas, P Webber, S TI Macroparticle simulations of antiproton lifetime at 150 GeV in the Tevatron SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB In this paper we report on a systematic study of antiproton lifetime at the injection energy of 150 GeV in the Tevatron. Our parallel beam-beam model can handle both strong-strong and weak-strong beam-beam collisions with abitrary beam-beam separation and beam distributions. In this study, we have only used the weak-strong capability due to the fact that the antiproton intensity is much smaller than the proton intensity. We have included all 72 long-range beam-beam collisions with a linear transfer map between adjacent collision points and taken into account linear chromaticity. The effects of antiproton emittance, beam-beam separation, proton intensity, and machine chromaticity have been investigated. Initial results show that the antiproton lifetime as a function of the proton intensity from the simulation is in good agreement with that from the experimental measurements. The antiproton lifetime can be significantly improved by increasing the beam separation and by reducing the antiproton emittance. C1 LBNL, Berkeley, CA 94720 USA. RP Qiang, J (reprint author), LBNL, Berkeley, CA 94720 USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3401 EP 3403 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601093 ER PT B AU Wang, CX AF Wang, CX BE Chew, J Lucas, P Webber, S TI Measurement and application of betatron modes with MIA SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We present Model-Independent Analysis (MIA)-based methods for measuring lattice properties of a storage ring such as phase advance, beta function, chromaticity, and tune shift with amplitude. Using beam position histories of excited betatron oscillations that are simultaneously measured at a large number of beam position monitors (BPMs), the spatial-temporal modes of betatron oscillation can be extracted with MIA-mode analysis. The resulting spatial vectors are used to determine linear phase advance and beta function, and the temporal vectors are used to determine nonlinear chromaticity and tune shift with amplitude. Measurements done at the Advanced Photon Source are reported. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Wang, CX (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 7 TC 5 Z9 6 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3407 EP 3409 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601095 ER PT B AU Wang, CX AF Wang, CX BE Chew, J Lucas, P Webber, S TI Spatial-temporal modes observed in the APS storage ring using MIA SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Singular-value decomposition of the data matrix containing beam position histories yields a spatial-temporal mode analysis of beam motion by effectively accomplishing the statistical Principal Component Analysis. Similar to the Fourier analysis, this mode analysis decomposes the spatial-temporal variation of the beam centroid into a superposition of orthogonal modes that are informative. We briefly review this mode analysis technique and show some interesting modes observed at the APS storage ring. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Wang, CX (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 2 TC 4 Z9 5 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3410 EP 3412 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601096 ER PT B AU Berg, JS Kahn, S Palmer, R Trbojevic, D Johnstone, C Keil, E Aiba, M Machida, S Mori, Y Ogitsu, T Ohmori, C Sessler, A Koscielniak, S AF Berg, JS Kahn, S Palmer, R Trbojevic, D Johnstone, C Keil, E Aiba, M Machida, S Mori, Y Ogitsu, T Ohmori, C Sessler, A Koscielniak, S BE Chew, J Lucas, P Webber, S TI FFAGS for muon acceleration SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn ID ELECTRON MODEL AB Due to their finite lifetime, muons must be accelerated very rapidly. It is challenging to make the magnets ramp fast enough to accelerate in a synchrotron, and accelerating in a linac is very expensive. One can use a recirculating accelerator (like CEBAF), but one needs a different arc for each turn, and this limits the number of turns one can use to accelerate, and therefore requires significant amounts of RF to achieve the desired energy gain. An alternative method for muon acceleration is using a. fixed field alternating gradient (FFAG) accelerator. Such an accelerator has a very large energy acceptance (a factor of two or three), allowing one to use the same arc with a magnetic field that is constant over time. Thus, one can in principle make as many turns as one can tolerate due to muon decay, therefore reducing the RF cost without increasing the arc cost. This paper reviews the current status of research into the design of FFAGs for muon acceleration. Several current designs are described and compared. General design considerations are also discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Berg, JS (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. RI Berg, Joseph/E-8371-2014 OI Berg, Joseph/0000-0002-5955-6973 NR 15 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3413 EP 3415 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601097 ER PT B AU Raparia, D Lee, YY Wei, J Henderson, S AF Raparia, D Lee, YY Wei, J Henderson, S BE Chew, J Lucas, P Webber, S TI Beam dump optics for the spallation neutron source SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Spallation Neutron Source accelerator complex will have three beam dumps for beam tuning and for the collection of controlled losses. The linac and extraction beam dumps will be used for beam tuning purposes and are designed for 7.5 kW of beam power. The optics issues for these dumps are i) the beam size at the vacuum window which is near the last quardrupole and ii) guaranteeing the beam size at the dump due to multiple scattering in the presence of potentially large variations in the linac and accumulator ring emittances. The injection dump will collect the partially stripped H-0 ions as well as H- ions which have miss the foil and is designed to absorb up to 200 kW of beam power. The closed orbit for these ions are much different in the injection area and have to be collected in the injection beam dump with a certain beam size. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Raparia, D (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 3 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3416 EP 3418 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601098 ER PT B AU Broemmelsiek, D Pasquinelli, R AF Broemmelsiek, D Pasquinelli, R BE Chew, J Lucas, P Webber, S TI Fermilab Recycler stochastic cooling commissioning and performance SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Fermilab Recycler is a fixed 8GeV kinetic energy storage ring located in the Fermilab Main Injector tunnel near the ceiling. The Recycler has two roles in Run II. First, to store antiprotons from the Fermilab Antiproton Accumulator so that the antiproton production rate is no longer compromised by large numbers of antiprotons stored in the Accumulator. Second, to receive;antiprotons from the Fermilab Tevatron at the end of luminosity periods. To perform each of these roles, stochastic cooling in the Recycler is needed to preserve and cool antiprotons in preparation for transfer to the Tevatron. The commissioning and performance of the Recycler stochastic cooling systems will be reviewed. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Broemmelsiek, D (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 3 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3431 EP 3433 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601103 ER PT B AU Gounder, K Marriner, J Mishra, S AF Gounder, K Marriner, J Mishra, S BE Chew, J Lucas, P Webber, S TI Time evolution of beam current in the recycler ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We study the time evolution of the beam current in the Fermilab Recycler Ring due to abrupt physical processes (single coloumb scattering, nuclear scattering) that cause sudden loss of beam, and diffusive processes (multiple coloumb scattering, lattice dpendence, etc.) which cause emittance growth. This emittance growth combined with finite aperure of the beam pipe will lead to eventual loss of most beam. We develop a fitting technique to the time evolution of beam current to estimate emittance growth. Finally we compare the directly measured growth with the fitted value. Work supported by the U.S. Department of Energy under contract No. DE-AC02-76CH03000. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Gounder, K (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3434 EP 3436 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601104 ER PT B AU Gounder, K Marriner, J Mishra, S Anderson, T AF Gounder, K Marriner, J Mishra, S Anderson, T BE Chew, J Lucas, P Webber, S TI Residual gas pressure profile in the recycler ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We simulate the pressure profile of residual gases from basic principles using detailed beam pipe geometry and the relevant physical parameters. These profiles are compared with the actual ion gauge measurements and is being used to predict the vacuum contribution to the Recycler Ring beam lifetime. Work supported by the U.S. Department of Energy under contract No. DE-AC02-76CH03000. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Gounder, K (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3437 EP 3439 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601105 ER PT B AU Spickermann, T Borden, M Browman, A Fitzgerald, D Macek, R McCrady, R Zaugg, T AF Spickermann, T Borden, M Browman, A Fitzgerald, D Macek, R McCrady, R Zaugg, T BE Chew, J Lucas, P Webber, S TI Stripper foil temperatures and electron emission at the Los Alamos proton storage ring SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We have modeled the heating process of the PSR stripper foil and compared our results to observations that depend on the foil temperature. The foil is heated by the energy deposited by injected H- ions and stored protons passing through the foil. Secondary emission of electrons due to these foil hits results in a measurable current that we can use to benchmark our model. At higher beam intensities thermionic emission of electrons dominates the foil current. Due to the extreme temperature dependence of the thermionic current this is a very sensitive indicator of the foil temperature and will be used to safeguard against overheating the foil in extreme beam conditions. We will present our best estimates of the foil temperature for different beam intensities. C1 Los Alamos Neutron Sci Ctr, LANL, Los Alamos, NM 87545 USA. RP Spickermann, T (reprint author), Los Alamos Neutron Sci Ctr, LANL, Los Alamos, NM 87545 USA. NR 6 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3455 EP 3457 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601111 ER PT B AU Jung, JY Marks, S Schlueter, R AF Jung, JY Marks, S Schlueter, R BE Chew, J Lucas, P Webber, S TI Testing and commissioning of the ALS adjustable, hysteresis-free chicane magnet SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The magnetic performance and commissioning of a new Advanced Light Source (ALS) chicane magnet are presented. The new magnet is iron free using permanent magnet rotors and trim coils, resulting in hysteresis-free operation. The theory and method for magnetic adjustments are discussed. Results of adjustments are presented that produce a maximum dipole field and reduce unallowed harmonics to below the required level of \b(n)/b(1)\ < 3 x 10-3. C1 LBNL, Berkeley, CA 94720 USA. RP Jung, JY (reprint author), LBNL, Berkeley, CA 94720 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3458 EP 3460 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601112 ER PT B AU Borland, M Emery, L Shang, H Soliday, R AF Borland, M Emery, L Shang, H Soliday, R BE Chew, J Lucas, P Webber, S TI SDDS-based software tools for accelerator design SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The Self-Describing Data Set (SDDS) file protocol is a standardized way to store and access data and is the basis of an extensive toolkit. It is also the file protocol used for many accelerator design tools. Over the years, several of these SDDS-compliant accelerator programs (e.g., clinchor, elegant, estat, shower, and spiffe) have been developed at the Advanced Photon Source. Also, existing accelerator design tools for which the source code is available (e.g., ABCI, GENESIS, GINGER, MAFIA, and URMEL) have been converted to read and write SDDS files. As a result, we now have a capable set of accelerator codes that make use of the same data format and the same pre- and postprocessing suite. Further, the SDDS toolkit program sddsoptimize can be used around any of these tools or around a script that runs one or more of these tools. This provides the capability of very general, multicode optimization. In this paper, we discuss the capabilities of the existing SDDS-compliant accelerator codes, then provide examples of applications of these tools. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Borland, M (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. NR 19 TC 11 Z9 11 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3461 EP 3463 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601113 ER PT B AU Emery, L AF Emery, L BE Chew, J Lucas, P Webber, S TI Application of model-independent analsis using the SDDS toolkit SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The model-independent analysis (MIA) method in accelerators has not yet come into widespread use, unfortunately. This is perhaps due to a lack of convenient tools to bring the measurement data to the results stage. At the Advanced Photon Source, we used the SDDS Toolkit and the SDDS-compliant EPICS Toolkit in simple and not-so-simple applications for diagnosing operational problems from beginning to end in a short time. We were able to make quantitative measurements of pulsed power supply noise and beam position monitor noise, and identify an unstable power supply. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Emery, L (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3464 EP 3466 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601114 ER PT B AU Lessner, ES Ostroumov, PN AF Lessner, ES Ostroumov, PN BE Chew, J Lucas, P Webber, S TI Beam dynamics optimization in the rare isotope accelerator driver linac SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A preliminary design of the superconducting linear accelerator of the Rare Isotope Accelerator (R)A) facility has been previously reported. The driver linac consists of about 400 superconducting independently-phased rf cavities, and is able to accelerate beams of any ion, including uranium, to energies of 400 MeV per nucleon and beam power of 400 kW. The linac has the novel capability of accelerating multiple-charge-state beams, which results in a significant increase in available beam current. Use of multiple-charge states imposes strict requirements on the steering procedure to avoid effective emittance growth. A program of detailed beam dynamics studies has been initiated to simplify the accelerator design, enhance its performance, and develop specifications for the engineering design of the accelerator systems. As part of the program, a correction algorithm has been developed that takes into consideration solenoid induced couplings. The correction method and initial results of corrections applied to the low- and medium-energy driver linac sections are presented. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Lessner, ES (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3467 EP 3469 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601115 ER PT B AU Shang, H Soliday, R Emery, L Borland, M AF Shang, H Soliday, R Emery, L Borland, M BE Chew, J Lucas, P Webber, S TI New features in the SDDS-compliant EPICS toolkit SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB This paper introduces new features and programs developed to enhance various aspects of the SDDS-compliant EPICS toolkit. A new optimization program, sddsoptimize, was added to the toolkit; it employs the Simplex and 1-D scan methods and can be used for both EPICS and non-EPICS optimizations. Several new data logging programs were also developed, including a new, more flexible glitch logger that logs data before and after a glitch occurs. Another new data logger logs data every time the value of a process variable changes. With the data generated from this program, it is now possible to restore settings from any arbitrary time without the need for a snapshot of the system. Another new addition is the capability of saving and restoring waveform process variables. In addition to these new features, performance improvements have been realized in all the toolkit programs by replacing EZCA calls with low-level channel-access calls. Some of the toolkit programs have been upgraded to run on vxWorks to achieve higher performance. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Shang, H (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. NR 4 TC 8 Z9 8 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3470 EP 3472 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601116 ER PT B AU Soliday, R Borland, M Emery, L Shang, H AF Soliday, R Borland, M Emery, L Shang, H BE Chew, J Lucas, P Webber, S TI New features in the SDDS toolkit SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Self-Describing Data Sets (SDDS) and the corresponding SDDS tools have long been used at the Advanced Photon Source (APS) and other laboratories for data storage and analysis. Various programs in the toolkit have been added or improved recently. Support for the Mac OS X operating system has been added. Automated testing scripts are being used to reduce bugs prior to software upgrades. The Java version of the SDDS Toolkit has been used to integrate standard SDDS functions into MATLAB. The fitting of generic functions to SDDS data has been improved. Conversion of array data to column data has been added to allow analysis of array data with existing programs. The display of sddsplot movies by saving plots to files for rapid playback has been improved. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Soliday, R (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. NR 4 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3473 EP 3475 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601117 ER PT B AU Soliday, R Borland, M Emery, L Shang, H AF Soliday, R Borland, M Emery, L Shang, H BE Chew, J Lucas, P Webber, S TI Use of a simple storage ring simulation for development of enhanced orbit correction software SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB At the Advanced Photon Source (APS) most of the testing of minor operational software is done during accelerator studies time. For major software changes, such as the porting of the complex workstation-based orbit control software to an EPICS IOC, much of the testing was done "offline" on a test IOC. A configurable storage ring simulator was created in a workstation with corresponding control system records for correctors and orbit readbacks. The simulator's features will be described as well as the method used to develop and debug the most recent improvement of the APS orbit control software, among others. The simulator is also useful in general-purpose software testing. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Soliday, R (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3476 EP 3478 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601118 ER PT B AU Iriso-Ariz, U Caspers, F Mostacci, A AF Iriso-Ariz, U Caspers, F Mostacci, A BE Chew, J Lucas, P Webber, S TI Evaluation of the horizontal to vertical transverse impedance ratio for LHC beam screen using a 2D electrostatic code SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The classical 2 wires method is not suitable for high precision transverse impedance measurements on a homogeneous copper beam-pipe with non circular cross-section due to measurement noise limitations in case of narrow wire spacing. Thus we tackled the problem by simulating the 2D electrostatic field and image charge distribution of that setup and subsequently calculating the corresponding surface current for a TEM wave excitation. In this computer simulation the 2 wires can be assumed lossless, which is not possible in a practical bench setup. The theoretical justification for the method and certain limitations are discussed. The results compare very well to several independent numerical and analytical. results. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Iriso-Ariz, U (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3479 EP 3481 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601119 ER PT B AU Malitsky, N Satogata, T Talman, R AF Malitsky, N Satogata, T Talman, R BE Chew, J Lucas, P Webber, S TI Configurable UAL-based modeling engine for online accelerator studies SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The diversity of online accelerator modeling tasks poses a considerable challenge for accelerator physicists and software developers. Compromises between performance and completeness are always required. For example, modeling of chromatic effects requires second-order calculations, while speed favors first-order matrix multiplication. This paper presents our solution: a configurable computational modeling engine based on the UAL Accelerator Propagator Framework (APF). The choices of evolution algorithms are defined in an external Accelerator Propagator Description Format (APDF) file, permitting a flexible mechanism for employing different approaches within the context of machine studies and operation. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Malitsky, N (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3482 EP 3484 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601120 ER PT B AU Courant, ED Berg, SJ Trbojevic, D Talman, R Garren, AA AF Courant, ED Berg, SJ Trbojevic, D Talman, R Garren, AA BE Chew, J Lucas, P Webber, S TI A comparison of several lattice tools for computation of orbit functions of an accelerator SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The values of orbit functions for accelerator lattices as computed with accelerator design programs may differ between different programs. For a simple lattice, consisting of identical constant-gradient bending magnets, the functions (horizontal and vertical betatron tunes, dispersions, closed orbit offsets, orbit lengths, chromaticities etc.) can be evaluated analytically. This lattice was studied with the accelerator physics tools SYNCH [11, COSY INFINITY [2], MAD [3], and TEAPOT [4]. It was found that while all the programs give identical results at the central design momentum, the results differ substantially among the various lattice tools for non-zero momentum deviations. Detailed results and comparisons are presented. C1 BNL, Upton, NY USA. RP Courant, ED (reprint author), BNL, Upton, NY USA. RI Berg, Joseph/E-8371-2014 OI Berg, Joseph/0000-0002-5955-6973 NR 6 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3485 EP 3487 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601121 ER PT B AU Ostiguy, JF Holmes, J AF Ostiguy, JF Holmes, J BE Chew, J Lucas, P Webber, S TI PyORBIT: A python shell for orbit SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB ORBIT is code developed at SNS to simulate beam dynamics in accumulation rings and synchrotrons. The code is structured as a collection of external C++ modules for SuperCode, a high level interpreter shell developed at LLNL in the early 1990s. SuperCode is no longer actively supported and there has for some time been interest in replacing it by a modem scripting language, while preserving the feet of the original ORBIT program. In this paper, we describe a new version of ORBIT where the role of SuperCode is assumed by Python, a free, well-documented and widely supported object-oriented scripting language. We also compare PyORBIT to ORBIT from the standpoint of features, performance and future expandability. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ostiguy, JF (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3503 EP 3505 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601127 ER PT B AU Kurennoy, SS Young, LM AF Kurennoy, SS Young, LM BE Chew, J Lucas, P Webber, S TI RF coupler for high-power CWFEL photoinjector SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB A high-current emittance-compensated RF photo-injector is a key enabling technology for a high-power CW FEL. The design presently under way is a 100-mA, 2.5-cell pi-mode, 700-MHz, normal conducting demonstration CW RF photoinjector. This photoinjector will be capable of accelerating 3 nC per bunch with an emittance at the wiggler less than 10 mm-mrad. The paper presents results for the RF coupling from ridged waveguides to the photoinjector RF cavity. The LEDA and SNS couplers inspired this "dog-bone" design. Electromagnetic modeling of the coupler-cavity system has been performed using both 2-D and 3-D frequency-domain calculations, and a novel time-domain approach with MicroWave Studio. These simulations were used to adjust the coupling coefficient and calculate the powerloss distribution on the coupling slot. The cooling of this slot is a rather challenging thermal management project. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Kurennoy, SS (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 5 TC 2 Z9 2 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3515 EP 3517 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601131 ER PT B AU Takeda, H Billen, JH AF Takeda, H Billen, JH BE Chew, J Lucas, P Webber, S TI Recent improvements in the PARMILA code SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We discuss capabilities, computational procedures, and recent improvements in the accelerator design code PARMILA. The name PARMILA stands for Phase and Radial Motion in Ion Linear Accelerators. We discuss the algorithms used in PARMILA, how the code designs individual linac sections to achieve efficient acceleration, and how it determines the distance between linac segments. We also discuss the restructuring and transformation of code from the Fortran 77 standard to the Fortran 90 standard. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Takeda, H (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 5 TC 0 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3518 EP 3520 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601132 ER PT B AU Young, L Billen, J AF Young, L Billen, J BE Chew, J Lucas, P Webber, S TI The particle tracking code PARMELA SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB The name PARMELA came from the phrase "Phase And Radial Motion in Electron Linear Accelerators," which described it earliest applications[ 1]. However, a decade ago, the code's capabilities were expanded to track particles of any mass and charge. A more recent addition was the ability to track particles of three different masses and any charge simultaneously. PARMELA uses time as the independent variable. PARMELA is a simulation code, and does not design a linac or beam transport channel. PARMELA can use electromagnetic fields calculated by other codes. These fields can be RF electromagnetic, static magnetic, or electrostatic. Both 2D cylindrically symmetric and fully 31) field maps can be used for all three types. The RF fields are confined to the rf cavity elements that describe standing-wave or traveling-wave structures. The static fields are treated as a background field that is superimposed over drift spaces and rf cavity elements. PARMELA includes options for selecting either 21) or 31) space-charge effects. The code's input file can supply data for most common beam-line components and accelerator structures. This paper describes some of the capabilities of PARMELA and a few examples of PARMELA simulations. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Young, L (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 2 TC 14 Z9 16 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3521 EP 3523 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601133 ER PT B AU Adelmann, A Furman, MA AF Adelmann, A Furman, MA BE Chew, J Lucas, P Webber, S TI PARSEC: Parallel self-consistent 3D electron-cloud simulation in arbitrary external fields SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We present PARSEC, a 3D parallel self-consistent particle tracking program which allows electron-cloud calculations in arbitrary external fields. The program is based on an general particle tracking framework called GenTrackE [5]. The Lorentz force equation is integrated with time as the independent variable. A 3D parallel Multigrid solver computes the electric field for the drive beam in the beam frame, while the space-charge field of the electrons is computed in the lab frame. The resulting total field, obtained by superposition, acts on both the beam particles and the cloud electrons. Primary and secondary emission takes place at each time step of the calculation. This sort of computation is only possible by the use of massive parallelization of the particle dynamics and the Poisson solver in combination with modem numerical algorithms such as the Multigrid solver with Gauss-Seidel smoothing. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Adelmann, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3524 EP 3526 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601134 ER PT B AU Allen, CK McChesney, CA Pattengale, ND Chu, CP Galambos, JD Klotz, WD Pelaia, TA Shishlo, A AF Allen, CK McChesney, CA Pattengale, ND Chu, CP Galambos, JD Klotz, WD Pelaia, TA Shishlo, A BE Chew, J Lucas, P Webber, S TI A modular on-line simulator for model reference control of charged particle beams SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB We have implemented a particle beam simulation engine based on modem software engineering principles with intent that it be a convenient model reference for high-level control applications. The simulator is an autonomous subsystem of the high-level application framework XAL currently under development for the Spallation Neutron Source (SNS). It supports multiple simulation techniques (i.e., single particle, multi-particle, envelope, etc.), automatically synchronizes with operating accelerator hardware, and also supports off-line design studies. Moreover, since it is implemented using modem techniques in the Java language, it is portable across operating platforms, is maintainable, and upgradeable. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Allen, CK (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3527 EP 3529 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601135 ER PT B AU Aleksandrov, A Alexandrov, V AF Aleksandrov, A Alexandrov, V BE Chew, J Lucas, P Webber, S TI On-line model of the SNS Medium Energy Beam Transport line SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB An on-line model of the beam dynamics in the SNS Medium Energy Beam Transport line (MEBT) has been developed using MATLAB Graphics User Interface. The model performs beam simulation using TRACE-3B and/or PARMILA codes. The input data for the simulation are generated on-line using settings of the transport line elements read from the EPICS control system. Simulated beam profiles are compared with wire scanner measurements on-line. Various tools are provided for estimating and fitting input beam parameters, which are not measured in the MEBT. This paper provides a description of the model and presents results of experimental tests during commissioning of the SNS Front End. C1 Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37830 USA. RP Aleksandrov, A (reprint author), Oak Ridge Natl Lab, SNS, POB 2008, Oak Ridge, TN 37830 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3536 EP 3538 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601138 ER PT B AU Kabel, AC AF Kabel, AC BE Chew, J Lucas, P Webber, S TI Particle tracking and bunch population in TraFiC(4) 2.0 SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB Coherent Synchrotron Radiation (CSR) plays an important role in the design of accelerator components with high peak currents and small bending radii, such as magnetic bunch compressors, wigglers, and compact storage rings. The code TraFiC4 has been developed to design such elements[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]; it simulates CSR effects from first principles. We present a re-write of the tracking and user interface components of TraFiC4. Extensions and corrections include: expanded input language; generalized bunch populations (rectangular, Gaussian, user-specified function); new element types; truly three-dimensional dynamics (i.e., the restriction to a single plane of motion has been abandoned), vastly expanded documentation; documented C++ class interface; and improved dynamic load-balancing for parallel computers. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Kabel, AC (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3539 EP 3541 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601139 ER PT B AU Limborg, C Batygin, Y Boscolo, M Giannessi, L Quattromini, M Carneiro, JP Floetmann, K AF Limborg, C Batygin, Y Boscolo, M Giannessi, L Quattromini, M Carneiro, JP Floetmann, K BE Chew, J Lucas, P Webber, S TI Code comparison for simulations of photo-injectors SO PROCEEDINGS OF THE 2003 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-5 LA English DT Proceedings Paper CT 20th Biennial Particle Accelerator Conference CY MAY 12-16, 2003 CL Portland, OR SP Stanford Linear Accelerator Ctr, Lawrence Berkeley Natl Lab, IEEE, Nucl & Plasma Sci Soc, Amer Phys Soc, Div Phys Beams, US DOE, USN Off Naval Res, Natl Sci Fdn AB RF photo-cathode injectors constitute one of the key components of many future single pass FEL based synchrotron radiation sources. The possibility of reaching very high brightness beams had been anticipated by using various simulations tools. Several experiments have proven that the 1mm.mrad normalized projected emittance for 1 nC, 10 ps pulses is within reach. For optimizing these photo-injectors, a first search of parameters is efficiently performed with HOMDYN. Further refinement in the tuning is usually obtained using a multi-particle tracking code such as ASTRA, PARMELA or BEAMPATH. In this paper, we compare results from HOMDYN, ASTRA, PARMELA, and BEAMPATH for the cases of an S-Band photo-injector. Limitations in their accuracy and differences between the codes are discussed. C1 SLAC, Menlo Pk, CA 94025 USA. RP Limborg, C (reprint author), SLAC, 2275 Sand Hill Rd, Menlo Pk, CA 94025 USA. OI Boscolo, Manuela/0000-0002-1997-6041 NR 8 TC 4 Z9 4 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7738-9 PY 2003 BP 3548 EP 3550 PG 3 WC Physics, Particles & Fields SC Physics GA BY93J UT WOS:000189498601142 ER PT S AU Golumbfskie, AJ Mundy, CJ Kubota, AM Nichols, A Quong, AA AF Golumbfskie, AJ Mundy, CJ Kubota, AM Nichols, A Quong, AA GP IEEE TI A three dimensional model of intercellular calcium signaling in epithelial cells SO PROCEEDINGS OF THE 25TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-4: A NEW BEGINNING FOR HUMAN HEALTH SE PROCEEDINGS OF ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY LA English DT Proceedings Paper CT 25th Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society CY SEP 17-21, 2003 CL Cancun, MEXICO SP IEEE Engn Med & Biol Soc, Coral, Univ Autonome Metropolitana, Sandia Natl Lab DE calcium; epithelial; signaling ID OSCILLATIONS; WAVES AB Nature has designed a highly regulated system for the transport of ions and small molecules across the epithelial barrier that separates the surfaces of the body from the external environment. These systems contain regulatory elements controlled by external and internal signals. In order to understand the complexity of these systems, we have developed a fully three-dimensional model of calcium signaling in epithelial cells. The model is based on a set of reaction diffusion equations that are solved on a large-scale finite-element code in three dimensions. We have explicitly included the major compartments in the cell (i.e. the nucleus and endoplasmic reticulum). The model allows for buffering of free Ca2+, calcium induced calcium release (CICR), and for the explicit inclusion of mobile buffers, mimicking the dyes used in the experiments. Additionally we have considered intercellular transport by including a realistic representation of the gap junctions that have a significant effect on the Ca2+ wave propagation. In order to make quantitative comparisons to experimental results, we have used fluorescence microscopy images of cell tissue to generate an accurate mesh. Using this realistic geometry, we present results for the Ca2+ wave propagation through the tissue as a function of both initial conditions used to start the wave and various geometrical parameters which affect propagation such as gap junction density and distribution, and presence of nuclei. C1 Lawrence Livermore Natl Lab, Chem Biol & Nucl Sci Div, Livermore, CA 94550 USA. RP Golumbfskie, AJ (reprint author), Lawrence Livermore Natl Lab, Chem Biol & Nucl Sci Div, Livermore, CA 94550 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1094-687X BN 0-7803-7789-3 J9 P ANN INT IEEE EMBS PY 2003 VL 25 BP 2694 EP 2697 DI 10.1109/IEMBS.2003.1280472 PN 1-4 PG 4 WC Cardiac & Cardiovascular Systems; Computer Science, Interdisciplinary Applications; Engineering, Biomedical; Medicine, Research & Experimental; Neurosciences; Radiology, Nuclear Medicine & Medical Imaging SC Cardiovascular System & Cardiology; Computer Science; Engineering; Research & Experimental Medicine; Neurosciences & Neurology; Radiology, Nuclear Medicine & Medical Imaging GA BY50W UT WOS:000189395300700 ER PT S AU Maltz, JS Budinger, TF AF Maltz, JS Budinger, TF GP IEEE TI Instrument for the non-invasive evaluation of human arterial endothelial function via measurement of changes in the transit time of an artificial pulse SO PROCEEDINGS OF THE 25TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-4: A NEW BEGINNING FOR HUMAN HEALTH SE PROCEEDINGS OF ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY LA English DT Proceedings Paper CT 25th Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society CY SEP 17-21, 2003 CL Cancun, MEXICO SP IEEE Engn Med & Biol Soc, Coral, Univ Autonome Metropolitana, Sandia Natl Lab DE endothelial function; pulse wave velocity; pulse transit time; flow-mediated dilation ID CORONARY ATHEROSCLEROSIS; DEPENDENT DILATION; RISK-FACTORS; DYSFUNCTION; REPRODUCIBILITY; ACETYLCHOLINE; CHOLESTEROL; RESPONSES; CHILDREN; WAVES AB Impairment of arterial endothelial function is an early event in atherosclerosis and correlates with the major risk factors for cardiovascular disease. The most widely used non-invasive measure of endothelial function involves the brachial artery (BA) diameter measurement using ultrasound imaging before and after several minutes of blood flow occlusion. The change in arterial diameter is a measure of flow-mediated vasorelaxation (FMVR). The high variability of results and high cost of instrumentation render this technique unsuitable for routine clinical use. We present an instrument we call the "relaxoscope" that is designed to overcome many obstacles that confine non-invasive assessment of FMVR to research settings. The relaxoscope induces an artificial pulse at the superficial radial artery via a linear actuator. An ultrasonic Doppler stethoscope detects this pulse 10-20 cm proximal to the point of pulse induction. The delay between pulse application and detection provides the pulse transit time (PTT). By measuring PTT before and after 5 minutes of BA occlusion and ensuing reactive hyperemia, FMVR may be measured based on the changes in PTT caused by changes in vessel caliber, smooth muscle tone and wall thickness. We compare the results obtained using the relaxoscope with M-mode BA diameter measurements in human subjects. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Dept Funct Imaging, Berkeley, CA 94720 USA. RP Maltz, JS (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Dept Funct Imaging, Berkeley, CA 94720 USA. NR 21 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1094-687X BN 0-7803-7789-3 J9 P ANN INT IEEE EMBS PY 2003 VL 25 BP 3133 EP 3136 DI 10.1109/IEMBS.2003.1280806 PN 1-4 PG 4 WC Cardiac & Cardiovascular Systems; Computer Science, Interdisciplinary Applications; Engineering, Biomedical; Medicine, Research & Experimental; Neurosciences; Radiology, Nuclear Medicine & Medical Imaging SC Cardiovascular System & Cardiology; Computer Science; Engineering; Research & Experimental Medicine; Neurosciences & Neurology; Radiology, Nuclear Medicine & Medical Imaging GA BY50W UT WOS:000189395300812 ER PT S AU Sokhansansanj, BA Fitch, JP Quong, JN Quong, AA AF Sokhansansanj, BA Fitch, JP Quong, JN Quong, AA GP IEEE TI Exhaustive search for fuzzy gene networks from microarray data SO PROCEEDINGS OF THE 25TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-4: A NEW BEGINNING FOR HUMAN HEALTH SE PROCEEDINGS OF ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY LA English DT Proceedings Paper CT 25th Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society CY SEP 17-21, 2003 CL Cancun, MEXICO SP IEEE Engn Med & Biol Soc, Coral, Univ Autonome Metropolitana, Sandia Natl Lab DE gene networks; gene regulation; microarrays; simulation; fuzzy logic ID SACCHAROMYCES-CEREVISIAE; EXPRESSION DATA; CELL-CYCLE; IDENTIFICATION AB Recent technological advances in high-throughput data collection allow for the study of increasingly complex systems on the scale of the whole cellular genome and proteome. Gene network models are required to interpret large and complex data sets. Rationally designed system perturbations (e.g. gene knock-outs, metabolite removal, etc) can be used to iteratively refine hypothetical models, leading to a modeling-experiment cycle for high-throughput biological system analysis. We use fuzzy logic gene network models because they have greater resolution than Boolean logic models and do not require the precise parameter measurement needed for chemical kinetics-based modeling. The fuzzy gene network approach is tested by exhaustive search for network models describing cyclin gene interactions in yeast cell cycle microarray data, with preliminary success in recovering interactions predicted by previous biological knowledge and other analysis techniques. Our goal is to further develop this method in combination with experiments we are performing on bacterial regulatory networks. C1 Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Livermore, CA USA. RP Sokhansansanj, BA (reprint author), Lawrence Livermore Natl Lab, Chem & Mat Sci Directorate, Livermore, CA USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1094-687X BN 0-7803-7789-3 J9 P ANN INT IEEE EMBS PY 2003 VL 25 BP 3571 EP 3574 DI 10.1109/IEMBS.2003.1280924 PN 1-4 PG 4 WC Cardiac & Cardiovascular Systems; Computer Science, Interdisciplinary Applications; Engineering, Biomedical; Medicine, Research & Experimental; Neurosciences; Radiology, Nuclear Medicine & Medical Imaging SC Cardiovascular System & Cardiology; Computer Science; Engineering; Research & Experimental Medicine; Neurosciences & Neurology; Radiology, Nuclear Medicine & Medical Imaging GA BY50W UT WOS:000189395300930 ER PT S AU de Solorzano, CO Chin, K Gray, JW Lockett, SJ AF de Solorzano, CO Chin, K Gray, JW Lockett, SJ GP IEEE TI In situ quantification of genomic instability in breast cancer progression SO PROCEEDINGS OF THE 25TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-4: A NEW BEGINNING FOR HUMAN HEALTH SE PROCEEDINGS OF ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY LA English DT Proceedings Paper CT 25th Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society CY SEP 17-21, 2003 CL Cancun, MEXICO SP IEEE Engn Med & Biol Soc, Coral, Univ Autonome Metropolitana, Sandia Natl Lab DE 3D image segmentation; genomic instability telomere crisis; FISH ID NUCLEI AB Genomic instability is a hallmark of breast and other solid cancers. Presumably caused by critical telomere reduction, GI is responsible for providing the genetic diversity required in the multi-step progression of the disease. We have used multicolor fluorescence in situ hybridization and 3D image analysis to quantify genomic instability cell-by-cell in thick, intact tissue sections of normal breast epithelium preneoplastic lesions (usual ductal hyperplasia), ductal carcinona is situ or invasive carcinoma of the breast.. Our in situ -cell by cell- analysis of genomic instability shows an important increase of genomic instability in the transition from hyperplasia to in situ carcinoma, followed by a reduction of instability in invasive carcinoma. This pattern suggests that the transition from hyperplasia to in situ carcinoma corresponds to telomere crisis and invasive carcinoma is a consequence of telomerase reactivation afer telomere crisis. C1 Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA USA. RP de Solorzano, CO (reprint author), Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA USA. RI Ortiz de Solorzano, Carlos/G-3278-2010 OI Ortiz de Solorzano, Carlos/0000-0001-8720-0205 NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1094-687X BN 0-7803-7789-3 J9 P ANN INT IEEE EMBS PY 2003 VL 25 BP 3578 EP 3581 DI 10.1109/IEMBS.2003.1280926 PN 1-4 PG 4 WC Cardiac & Cardiovascular Systems; Computer Science, Interdisciplinary Applications; Engineering, Biomedical; Medicine, Research & Experimental; Neurosciences; Radiology, Nuclear Medicine & Medical Imaging SC Cardiovascular System & Cardiology; Computer Science; Engineering; Research & Experimental Medicine; Neurosciences & Neurology; Radiology, Nuclear Medicine & Medical Imaging GA BY50W UT WOS:000189395300932 ER PT S AU May, EE AF May, EE GP IEEE TI Optimal generators for a systematic block code model of prokaryotic translation initiation SO PROCEEDINGS OF THE 25TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-4: A NEW BEGINNING FOR HUMAN HEALTH SE PROCEEDINGS OF ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY LA English DT Proceedings Paper CT 25th Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society CY SEP 17-21, 2003 CL Cancun, MEXICO SP IEEE Engn Med & Biol Soc, Coral, Univ Autonome Metropolitana, Sandia Natl Lab DE coding theory; prokaryotic translation initiation; systematic block codes ID INFORMATION-CONTENT; SEQUENCES AB The decoding of received error control encoded bit streams is fairly straightforward when the channel encoding algorithms are efficient and known. But if the encoding scheme is unknown or part of the data is missing, how would one design a viable decoder for the received transmission. Communication engineers may not frequently encounter this situation, but for computational biologists this is an immediate challenge as we attempt to decipher and understand the vast amount of sequence data produced by genome sequencing projects. Assuming the systematic parity check block code model of protein translation initiation [1], this work presents an approach for determining the generator matrix given a set of potential codewords. The resulting generators and corresponding parity matrices are applied to valid and invalid Escherichia coli K-12 MG1655 messenger RNA leader sequences. The generators constructed using strict subsets of the 16S ribosomal RNA performed better than those constructed using the (5,2) block code model in earlier work [1], [2]. C1 Sandia Natl Labs, Computat Biol Dept, Albuquerque, NM 87185 USA. RP May, EE (reprint author), Sandia Natl Labs, Computat Biol Dept, POB 5800, Albuquerque, NM 87185 USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1094-687X BN 0-7803-7789-3 J9 P ANN INT IEEE EMBS PY 2003 VL 25 BP 3858 EP 3860 DI 10.1109/IEMBS.2003.1281005 PN 1-4 PG 3 WC Cardiac & Cardiovascular Systems; Computer Science, Interdisciplinary Applications; Engineering, Biomedical; Medicine, Research & Experimental; Neurosciences; Radiology, Nuclear Medicine & Medical Imaging SC Cardiovascular System & Cardiology; Computer Science; Engineering; Research & Experimental Medicine; Neurosciences & Neurology; Radiology, Nuclear Medicine & Medical Imaging GA BY50W UT WOS:000189395301011 ER PT B AU Chen, J Watson, W AF Chen, J Watson, W BE Chen, SH Cheng, HD Chiu, DKY Das, S Duro, R Kerre, EE Leong, HV Li, Q Lu, M Romay, MG Ventura, D Wu, J TI Communication software performance for linux clusters with mesh connections SO PROCEEDINGS OF THE 7TH JOINT CONFERENCE ON INFORMATION SCIENCES LA English DT Proceedings Paper CT 7th Joint Conference on Information Sciences (JCIS) CY SEP 26-30, 2003 CL RES TRIANGLE PK, NC SP Assoc Intelligent Machinery, Duke Univ, Elsevier Publ Inc, Informat Sci Journal, Harbin Inst Technol, NIEHS DE linux cluster; M-VIA; gigabit ethernet; myrinet; bandwidth; latency AB Recent progress in copper based commodity Gigabit Ethernet interconnects enables constructing clusters to achieve extremely high I/O bandwidth at low cost with mesh connections. However, the TCP/IP protocol stack cannot match the improved performance of Gigabit Ethernet networks especially in the case of multiple interconnects on a single host. In this paper, we evaluate and compare the performance characteristics of TCP/IP and M-VIA [1] software that is an implementation of VIA [2]. In particular, we focus on the performance of the software systems for a mesh communication architecture and demonstrate the feasibility of using multiple Gigabit Ethernet cards on one host to achieve aggregated bandwidth and latency that are not only better than what TCP provides but also compare favorably to some of the special purpose high-speed networks. In addition, implementation of a new M-VIA driver for one type of Gigabit Ethernet card will be discussed. C1 Thomas Jefferson Natl Accelerator Facil, High Performance Comp Grp, Newport News, VA 23606 USA. RP Chen, J (reprint author), Thomas Jefferson Natl Accelerator Facil, High Performance Comp Grp, 12000,Jefferson Ave, Newport News, VA 23606 USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU ASSOC INTELLIGENT MACHINERY PI DURHAM PA PO BOX 90291, DURHAM, NC 27708-0291 USA BN 0-9707890-2-5 PY 2003 BP 381 EP 384 PG 4 WC Computer Science, Artificial Intelligence; Computer Science, Information Systems; Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BX96T UT WOS:000187061500097 ER PT B AU Kamimura, R Abdulla, G Baldwin, C Critchlow, T Lee, B Lozares, I Musick, R Tang, N AF Kamimura, R Abdulla, G Baldwin, C Critchlow, T Lee, B Lozares, I Musick, R Tang, N BE Chen, SH Cheng, HD Chiu, DKY Das, S Duro, R Kerre, EE Leong, HV Li, Q Lu, M Romay, MG Ventura, D Wu, J TI Use of numerical models as data proxies for approximate ad-hoc query processing SO PROCEEDINGS OF THE 7TH JOINT CONFERENCE ON INFORMATION SCIENCES LA English DT Proceedings Paper CT 7th Joint Conference on Information Sciences (JCIS) CY SEP 26-30, 2003 CL RES TRIANGLE PK, NC SP Assoc Intelligent Machinery, Duke Univ, Elsevier Publ Inc, Informat Sci Journal, Harbin Inst Technol, NIEHS AB As datasets grow beyond the gigabyte scale, there is an increasing demand to develop techniques for dealing/interacting with them. To this end, the DataFoundry team at the Lawrence Livermore National Laboratory has developed a software prototype called Approximate Adhoc Query Engine for Simulation Data (AQSim). The goal of AQSim is to provide a framework that allows scientists to interactively perform adhoc queries over terabyte scale datasets using numerical models as proxies for the original data. The advantages of this system are several. The first is that by storing only the model parameters, each dataset occupies a smaller footprint compared to the original, increasing the shelf life of such datasets before they are sent to archival storage. Second, the models are geared towards approximate querying as they are built at different resolutions, allowing the user to make the tradeoff between model accuracy and query response time. This allows the user greater opportunities for exploratory data analysis. Lastly, several different models are allowed, each focusing on a different characteristic of the data thereby enhancing the interpretability of the data compared to the original. The focus of this paper is on the modeling aspects of the AQSim framework. C1 Lawrence Livermore Natl Lab, CASC, Livermore, CA USA. RP Kamimura, R (reprint author), Lawrence Livermore Natl Lab, CASC, Livermore, CA USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU ASSOC INTELLIGENT MACHINERY PI DURHAM PA PO BOX 90291, DURHAM, NC 27708-0291 USA BN 0-9707890-2-5 PY 2003 BP 588 EP 593 PG 6 WC Computer Science, Artificial Intelligence; Computer Science, Information Systems; Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BX96T UT WOS:000187061500147 ER PT B AU North, M Macal, C Cirillo, D Conzelmann, G Koritarov, V Thimmapuram, P Veselka, T AF North, M Macal, C Cirillo, D Conzelmann, G Koritarov, V Thimmapuram, P Veselka, T BE Chen, SH Cheng, HD Chiu, DKY Das, S Duro, R Kerre, EE Leong, HV Li, Q Lu, M Romay, MG Ventura, D Wu, J TI Applying computational intelligence to economic policy SO PROCEEDINGS OF THE 7TH JOINT CONFERENCE ON INFORMATION SCIENCES LA English DT Proceedings Paper CT 7th Joint Conference on Information Sciences (JCIS) CY SEP 26-30, 2003 CL RES TRIANGLE PK, NC SP Assoc Intelligent Machinery, Duke Univ, Elsevier Publ Inc, Informat Sci Journal, Harbin Inst Technol, NIEHS AB As most know, electric utility systems are evolving. Until recently, most electric power systems where managed by regulated, vertically integrated monopolies. Many places, including Illinois, are planning to change to open markets despite the initial outcomes found in places such California. In the old systems, decision-making was centralized within the managing monopolies. Most power systems analysis models developed over the last three decades are based on the implicit assumption of a centralized decision-making process. In deregulated systems decision-making is distributed among many competing organizations. Unfortunately, the old models are limited in their ability to adequately analyze markets with decentralized decision-making. Agent-based modeling can explicitly address decentralized decision-making. This can make it appropriate to support modern electricity market policy making. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP North, M (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU ASSOC INTELLIGENT MACHINERY PI DURHAM PA PO BOX 90291, DURHAM, NC 27708-0291 USA BN 0-9707890-2-5 PY 2003 BP 1231 EP 1234 PG 4 WC Computer Science, Artificial Intelligence; Computer Science, Information Systems; Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BX96T UT WOS:000187061500299 ER PT S AU Seifter, A Boboridis, K Obst, AW AF Seifter, A Boboridis, K Obst, AW BE Fletcher, K TI High-speed temperature and emissivity measurements for thermophysical property determination of conducting materials SO PROCEEDINGS OF THE 9TH INTERNATIONAL SYMPOSIUM ON MATERIALS IN A SPACE ENVIRONMENT SE ESA SPECIAL PUBLICATIONS LA English DT Proceedings Paper CT 9th International Symposium on Materials in a Space Environment CY JUN 16-20, 2003 CL NOORDWIJK, NETHERLANDS ID LASER POLARIMETRY AB Materials in aerospace and other applications are often used near their mechanical limits at high temperatures. Predicting material behavior under such conditions requires that their properties be measured accurately. For a number of reasons (vaporization, reaction with containers, etc.) in many experimental techniques the sample is heated very rapidly (a few mus to ms time regime) by passing an electric current through it or by laser heating. This fast heating is why pyrometry is often the only way to get reliable temperature data from these experiments. The radiance temperature can be determined within a fraction of a Kelvin to a few Kelvin, depending on the speed of the experiment and the temperature to be measured. In order to extract thermodynamic temperatures from the radiance temperature another quantity - the normal spectral emissivity at the wavelength of the pyrometer used - must be known. Unfortunately emissivity depends not only on the material and temperature of the sample but also on surface conditions such as roughness and contamination, making this a difficult measurement to make accurately. This paper deals with the basics of pyrometry applied to high-speed measurements and also with ways to determine emissivity with reasonable accuracy. C1 Los Alamos Natl Lab, Phys Div P 23, Los Alamos, NM 87545 USA. RP Seifter, A (reprint author), Los Alamos Natl Lab, Phys Div P 23, P-23,MS H803, Los Alamos, NM 87545 USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU ESA PUBLICATIONS DIVISION C/O ESTEC PI 2200 AG NOORDWIJK PA PO BOX 299, 2200 AG NOORDWIJK, NETHERLANDS SN 0379-6566 BN 92-9092-850-6 J9 ESA SP PUBL PY 2003 VL 540 BP 375 EP 380 PG 6 WC Engineering, Aerospace; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BX81C UT WOS:000186500800045 ER PT B AU Abrikosov, AA AF Abrikosov, AA BE Bonitz, M Semkat, D TI Story about the temperature technique SO Proceedings of the Conference Progress in Nonequilibrium Green's Functions II LA English DT Proceedings Paper CT Conference on Progress in Nonequilibrium Greens Functions CY AUG 19-23, 2002 CL Dresden, GERMANY SP Wilhelm & Else Heraeus Stift C1 Argonne Natl Lab, Div Sci Mat, Argonne, IL 60439 USA. RP Abrikosov, AA (reprint author), Argonne Natl Lab, Div Sci Mat, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-271-2 PY 2003 BP 2 EP 3 DI 10.1142/9789812705129_0001 PG 2 WC Physics, Mathematical SC Physics GA BCI29 UT WOS:000229502400001 ER PT B AU Abrikosov, AA AF Abrikosov, AA BE Bonitz, M Semkat, D TI Theory of high-T-c superconductivity in layered cuprates SO Proceedings of the Conference Progress in Nonequilibrium Green's Functions II LA English DT Proceedings Paper CT Conference on Progress in Nonequilibrium Greens Functions CY AUG 19-23, 2002 CL Dresden, GERMANY SP Wilhelm & Else Heraeus Stift ID HIGH-TEMPERATURE SUPERCONDUCTORS; SADDLE-POINT MODEL; VALENCE-BOND STATE; FERMI-SURFACE; OPTICAL CONDUCTIVITY; ORDER-PARAMETER; VANHOVE SINGULARITIES; NORMAL TRANSPORT; PSEUDOGAP; AXIS AB A model of superconductivity in high-temperature superconducting layered cuprates is proposed, based oil the extended saddle point singularities in the electron spectrum, weak screening of the Coulomb interaction and phonon-mediated interaction between electrons plus a small short-range repulsion of llund's, or spin-fluctuation, origin. This permits to explain the large values of T-c, features of the isotope effect on oxygen and copper, the existence of two types of the order parameter, the peak in the inelastic neutron scattering, the positive curvature of the upper critical field, as function of temperature, etc. The resonant tunneling mechanism for the c-axis transport is proposed. Real physical properties are calculated and compared with experimental data. These include the temperature dependence of the static c-axis conductivity in the normal state, frequency dependence of the optical conductivity and stationary supercurrent along the c-axis. It is demonstrated that for the latter the coherence of resonant tunneling through different centers is of primary importance. The resonant tunneling idea is used for description of the origin and some properties of the "pseudogap phase". The superconducting critical temperature in this picture is defined at low doping by establishment of a 3-dimensional phase correlation between the layers, and at high doping by destruction of a d-wave superconductivity by disorder. The result is a nonmonotonic dependence of T-c on doping. The pseudogap phase is described oil the basis of the Franz-Millis model of superconducting fluctuations, consisting of small superconducting domains with uncorrelated supercurrents. The calculated characteristics, namely, the spectral function, the inelastic neutron scattering cross section, and the spin susceptibility agree with experimental data. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Abrikosov, AA (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 67 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-271-2 PY 2003 BP 18 EP 49 DI 10.1142/9789812705129_0003 PG 32 WC Physics, Mathematical SC Physics GA BCI29 UT WOS:000229502400003 ER PT B AU Marciano, WJ AF Marciano, WJ BE Baer, H Belyaev, A TI Anomalous magnetic moments SO PROCEEDINGS OF THE DIRAC CENTENNIAL SYMPOSIUM LA English DT Proceedings Paper CT Dirac Centennial Symposium CY DEC 06-07, 2002 CL Florida State Univ, Dept Phys, Tallahassee, FL HO Florida State Univ, Dept Phys ID ELECTROMAGNETIC INTERACTIONS; ELECTROWEAK CORRECTIONS; QUANTUM-THEORY; DIPOLE-MOMENT; MUON; WEAK; SUPERGRAVITY; MODEL AB The Dirac equation explained why the gyromagnetic ratio, g factor, is equal to 2 for fundamental spin 1 particles. Quantum loop effects were subsequently shown to induce a small shift or anomaly, a equivalent to (g - 2)/2. Anomalous magnetic moment effects have been calculated and measured with extraordinary precision for the electron and muon. Here, the Standard Model's predictions for a(l) = (g(l) - 2)/2, l = e, mu are described and compared with experimental values. Implications for probing "New Physics" effects are also discussed. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Marciano, WJ (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. NR 40 TC 0 Z9 0 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-412-X PY 2003 BP 77 EP 87 DI 10.1142/9789812703996_0006 PG 11 WC History & Philosophy Of Science; Physics, Multidisciplinary SC History & Philosophy of Science; Physics GA BCJ53 UT WOS:000229639900006 ER PT B AU Goldhaber, M AF Goldhaber, M BE Baer, H Belyaev, A TI Amending the standard model of particle physics SO PROCEEDINGS OF THE DIRAC CENTENNIAL SYMPOSIUM LA English DT Proceedings Paper CT Dirac Centennial Symposium CY DEC 06-07, 2002 CL Florida State Univ, Dept Phys, Tallahassee, FL HO Florida State Univ, Dept Phys AB Some of my earlier arguments, suggesting modifications of the Standard Model of Particle Physics (see ref. (1)), are elaborated and extended. Rules deduced from the known properties of elementary fermions are sharpened and extended in the first part. Conclusions drawn from the rules in the second part are also honed and expanded and an estimate of the neutrino mass eigenstates is added. In the third part, a tentative explanation of the rules is discussed. In my earlier paper, I suggested replacing the point-sources postulated by the Standard Model for each generation by finite 'source-shapes', equal for all elementary fermions of a generation and systematically decreasing in volume from the first to the third generation, thus increasing the effect of self-interactions. According to the rules a correlation exists between the mass of an elementary fermion and the strength of its self-interaction, thus an increase in self-interactions would resolve the problem of the hierarchical masses. A possible connection between the existence of only three generations and the three-dimensionality of space also is discussed. In the epilogue the question is explored whether finite source-shapes for the elementary fermions can be reconciled with fundamental theoretical tenets. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Goldhaber, M (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. NR 23 TC 0 Z9 0 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-412-X PY 2003 BP 167 EP 180 DI 10.1142/9789812703996_0014 PG 14 WC History & Philosophy Of Science; Physics, Multidisciplinary SC History & Philosophy of Science; Physics GA BCJ53 UT WOS:000229639900014 ER PT B AU Arnold, S Ernst, T Tomasi, D Caparelli, EC Chang, L AF Arnold, S Ernst, T Tomasi, D Caparelli, EC Chang, L BE Reisman, S Foulds, R Mantilla, B TI Residual effects of head movement in fMRI SO PROCEEDINGS OF THE IEEE 29TH ANNUAL NORTHEAST BIOENGINEERING CONFERENCE LA English DT Proceedings Paper CT IEEE 29th Annual Northeast Bioengineering Conference CY MAR 22-23, 2003 CL NJ INST TECHNOL, NEWARK, NJ SP Schering Plough, Becton Dickinson, Boston Sci, Reva Med, Vyteris, Whitaker Fdn, NJIT Pre Coll Programs, NJIT Student Senate, NJIT Grad Student Assoc HO NJ INST TECHNOL DE functional magnetic resonance imaging; motion correction; stimulus-correlated motion; false activation ID STIMULUS-CORRELATED MOTION; ACTIVATION; ARTIFACTS; BRAIN AB Relatively large (>3 mm) and stimulus-correlated head movement during blood oxygen level dependent (BOLD) functional magnetic resonance imaging (fMRI) is known to produce regions of false activation. We investigated a possible difference in brain activation with weakly correlated through-plane and in-plane head movement in fourteen healthy volunteers. MM was performed on a 4 Tesla whole-body MRI scanner, using gradient-echo single-shot EPI. Regions of false activation occurred despite small movements (< 1mm-translations and < 1degrees-rotations) and motion correction. False activation was also observed when the motion was weakly correlated with the stimulus. Investigation of the extent of the residual effects of head movement and stimulus-correlated motion are required to increase the confidence that results reflect genuine activation rather than motion in false studies. C1 Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. RP Arnold, S (reprint author), Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA. RI Tomasi, Dardo/J-2127-2015 NR 7 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-7767-2 PY 2003 BP 77 EP 78 PG 2 WC Computer Science, Artificial Intelligence; Engineering, Biomedical; Instruments & Instrumentation; Radiology, Nuclear Medicine & Medical Imaging SC Computer Science; Engineering; Instruments & Instrumentation; Radiology, Nuclear Medicine & Medical Imaging GA BX14C UT WOS:000184414900037 ER PT J AU Ho, SP Riester, L Drews, M Boland, T LaBerge, M AF Ho, SP Riester, L Drews, M Boland, T LaBerge, M TI Nanoindentation properties of compression-moulded ultra-high molecular weight polyethylene SO PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE LA English DT Article DE ultra-high molecular weight polyethylene (UHMWPE); nanoindentation; nanostructure; etching; atomic force microscopy (AFM); mechanical properties ID SCANNING ELECTRON-MICROSCOPY; ATOMIC-FORCE MICROSCOPE; NANOSCALE INDENTATION; TOTAL HIP; WEAR; MICROSTRUCTURE; POLYMERS; STRESSES; IMPLANTS; CONTACT AB This paper investigates the elastic modulus and hardness of untreated and treated compression-moulded ultra-high molecular weight polyethylene (UHMWPE) tibial inserts of a total knee replacement (TKR) prosthesis. Investigations were carried Out at a nanoscale using a Nanoindenter(TM) at penetration depths of 100, 250 and 500 rim. The nanomechanical properties of surface and subsurface layers of the compression-moulded tibial inserts were studied using the untreated UHMWPE. The nanomechanical properties of intermediate and core layers of the compression-moulded tibial insert were studied using the cryoultrasectioned and etched UHMWPE treated samples. The cryoultrasectioning temperature (-150degreesC) of the samples was below the glass transition temperature, T-g (-122 +/- 2degreesC), of UHMWPE. The measurement of the mechanical response of crystalline regions within the nanostructure of UHMWPE was accomplished by removing the amorphous regions using a time-varying permanganic-etching technique. The percentage crystallinity of UHMWPE was measured using differential scanning calorimetry (DSC) and the T-g of UHMWPE was determined by dynamic mechanical analysis (DMA). Atomic force microscopy (AFM) was used to assess the effect of surface preparation on the samples average surface roughness, R-a. In this study, it was demonstrated that the untreated UHMWPE samples had a significantly lower (p < 0.0001) elastic modulus and hardness relative to treated UHMWPE cryoultrasectioned and etched samples at all penetration depths. No significant difference (p > 0.05) in elastic modulus and hardness between the cryoultrasectioned and etched samples was observed. These results suggest that the surface nanomechanical response of an UHMWPE insert in a total Joint replacement (TJR) prosthesis is significantly lower compared with the bulk of the material. Additionally, it was concluded that the nanomechanical response of material with higher percentage crystallinity (67 per cent) was predominantly determined by the crystalline regions within the semi-crystalline UHMWPE nanostructure. C1 Univ Calif San Francisco, Dept Preventat & Restorat Dent Sci, San Francisco, CA 94143 USA. Oak Ridge Natl Lab, High Temp Mat Lab, Oak Ridge, TN 37831 USA. Clemson Univ, Sch Mat Sci & Engn, Clemson, SC USA. Clemson Univ, Dept Bioengn, Clemson, SC USA. RP LaBerge, M (reprint author), Clemson Univ, Dept Bioengn, Rhodes Res Ctr 501, Clemson, SC 29634 USA. OI Ho, Sunita/0000-0001-9999-8226 NR 33 TC 12 Z9 12 U1 0 U2 14 PU PROFESSIONAL ENGINEERING PUBLISHING LTD PI BURY ST EDMUNDS PA NORTHGATE AVENUE, BURY ST EDMUNDS IP32 6BW, SUFFOLK, ENGLAND SN 0954-4119 J9 P I MECH ENG H JI Proc. Inst. Mech. Eng. Part H-J. Eng. Med. PY 2003 VL 217 IS H5 BP 357 EP 366 DI 10.1243/095441103770802522 PG 10 WC Engineering, Biomedical SC Engineering GA 730PE UT WOS:000185838500005 PM 14558648 ER PT S AU Kenyon, GT Theiler, J Marshak, DW Moore, B Jeffs, J Travis, BJ AF Kenyon, GT Theiler, J Marshak, DW Moore, B Jeffs, J Travis, BJ GP IEEE IEEE TI Firing correlations improve detection of moving bars IJCNN 2003 SO PROCEEDINGS OF THE INTERNATIONAL JOINT CONFERENCE ON NEURAL NETWORKS 2003, VOLS 1-4 SE IEEE International Joint Conference on Neural Networks (IJCNN) LA English DT Proceedings Paper CT International Joint Conference on Neural Networks CY JUL 20-24, 2003 CL PORTLAND, OR SP Int Neural Network Soc, IEEE Neural Networks Soc ID LATERAL GENICULATE-NUCLEUS; CAT RETINA; GANGLION-CELLS; SYNCHRONIZATION; RESPONSES; NEURONS; RANGE AB Moving stimuli elicit oscillatory responses from retinal ganglion cells at frequencies between. 60-100 Hz. We used a computer model of the inner, retina to investigate whether the additional firing synchrony resulting from stimulus-evoked high frequency oscillations could contribute to the detection of moving bars. The responses of the model ganglion cells were similar to those of cat alpha cells. Event trains from the model ganglion cells stimulated by moving bars were summed into a threshold detector with a short integration window (2-4 msec) whose output was classified by an ideal observer. To isolate the contribution from firing correlations, the model ganglion cells were replaced by independent Poisson generators with matched time-dependent event rates. Compared to this control, firing correlations between the model ganglion cells allowed for improved detection of moving stimuli. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Kenyon, GT (reprint author), Los Alamos Natl Lab, P-21,MS D454, Los Alamos, NM 87545 USA. OI Moore IV, Bartlett/0000-0002-3164-0452 NR 11 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1098-7576 BN 0-7803-7898-9 J9 IEEE IJCNN PY 2003 BP 1274 EP 1279 PG 6 WC Computer Science, Artificial Intelligence SC Computer Science GA BX30P UT WOS:000184903300231 ER PT S AU Ma, JS Perkins, S AF Ma, JS Perkins, S GP IEEE IEEE TI Time-series novelty detection using one-class support vector machines SO PROCEEDINGS OF THE INTERNATIONAL JOINT CONFERENCE ON NEURAL NETWORKS 2003, VOLS 1-4 SE IEEE International Joint Conference on Neural Networks (IJCNN) LA English DT Proceedings Paper CT International Joint Conference on Neural Networks CY JUL 20-24, 2003 CL PORTLAND, OR SP Int Neural Network Soc, IEEE Neural Networks Soc ID NETWORK AB Time-series novelty detection, or anomaly detection, refers to the automatic identification of novel or abnormal events embedded in normal time-series points. Although it is a challenging topic in data mining, it has been acquiring increasing attention due to its huge potential for immediate applications. In this paper, a new algorithm for time-series novelty detection based on one-class support vector machines (SVMs) is proposed. The concepts of phase and projected phase spaces are first introduced,, which allows us to convert a time-series into a set of vectors in the (projected) phase spaces. Then we interpret novel events in time-series as outliers of the "normal" distribution of the converted vectors in the (projected) phase spaces. One-class SVMs are employed as the outlier detectors. In order to obtain robust detection results, a technique to combine intermediate results at different phase spaces is also proposed. Experiments on both synthetic and measured data are presented to demonstrate the promising performance of the new algorithm. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Ma, JS (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 19 TC 38 Z9 41 U1 2 U2 5 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1098-7576 BN 0-7803-7898-9 J9 IEEE IJCNN PY 2003 BP 1741 EP 1745 PG 5 WC Computer Science, Artificial Intelligence SC Computer Science GA BX30P UT WOS:000184903300317 ER PT B AU Yu, LH AF Yu, LH BE Nieh, HT TI Research and development towards x-ray free electron lasers SO PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON FRONTIERS OF SCIENCE LA English DT Proceedings Paper CT International Symposium on Frontiers in Science CY JUN 16-19, 2002 CL UNIV TSINGHUA, BEIJING, PEOPLES R CHINA SP Minist Educ China, Minist Sci & Technol China, Chinese Acad Sci, China Assoc Sci & Technol, Natl Nat Sci Fdn China, Chinese Phys Soc, Microsoft Res Asia HO UNIV TSINGHUA ID AMPLIFIED SPONTANEOUS-EMISSION; HIGH-GAIN REGIME; GENERATION; RADIATION AB In this paper we describe the basic principles of the high gain free electron lasers (FEL) and the research and development towards X-ray FEL. We discuss several different schemes of seeded single pass FEL to improve the temporal coherence, and the advantages and limitations of these schemes. We discuss the High Gain Harmonic Generation (HGHG) experiment in the infrared region, and the recent Deep Ultraviolet FEL experiment using the HGHG method at Brookhaven National Laboratory. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Yu, LH (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 30 TC 0 Z9 0 U1 1 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-407-3 PY 2003 BP 142 EP 162 PG 21 WC Physics, Multidisciplinary SC Physics GA BX87S UT WOS:000186708100012 ER PT B AU Volkov, VV Schofield, MA Zhu, Y AF Volkov, VV Schofield, MA Zhu, Y BE Nieh, HT TI Phase retrieval and induction mapping of artificially structured micromagnetic arrays SO PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON FRONTIERS OF SCIENCE LA English DT Proceedings Paper CT International Symposium on Frontiers in Science CY JUN 16-19, 2002 CL UNIV TSINGHUA, BEIJING, PEOPLES R CHINA SP Minist Educ China, Minist Sci & Technol China, Chinese Acad Sci, China Assoc Sci & Technol, Natl Nat Sci Fdn China, Chinese Phys Soc, Microsoft Res Asia HO UNIV TSINGHUA ID MAGNETIZATION REVERSAL; INTENSITY EQUATION; FIELD; TRANSPORT; COBALT AB We report our study on magnetic structural evolution of artificially patterned micron and submicron magnetic arrays as a function of applied field using in-situ electron microscopy. To understand magnetic dynamics and switching behavior we employ our newly developed phase retrieval method, based on Lorentz phase microscopy, to map local induction distribution at nanometric scale. We outline the principle of the new method and discuss its advantages and drawbacks in comparison with off-axis electron holography. C1 Brookhaven Natl Lab, Long Isl City, NY 11973 USA. RP Zhu, Y (reprint author), Brookhaven Natl Lab, Long Isl City, NY 11973 USA. RI Volkov, Vyacheslav/D-9786-2016 NR 18 TC 0 Z9 0 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-407-3 PY 2003 BP 480 EP 491 PG 12 WC Physics, Multidisciplinary SC Physics GA BX87S UT WOS:000186708100046 ER PT B AU Chen, P AF Chen, P BE Nieh, HT TI Generalized uncertainty principle and dark matter SO PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON FRONTIERS OF SCIENCE LA English DT Proceedings Paper CT International Symposium on Frontiers in Science CY JUN 16-19, 2002 CL UNIV TSINGHUA, BEIJING, PEOPLES R CHINA SP Minist Educ China, Minist Sci & Technol China, Chinese Acad Sci, China Assoc Sci & Technol, Natl Nat Sci Fdn China, Chinese Phys Soc, Microsoft Res Asia HO UNIV TSINGHUA ID BLACK-HOLE RELICS; HYBRID INFLATION; QUANTUM-GRAVITY; MASS; PERTURBATION; COSMOLOGY AB There have been proposals that primordial black hole remnants (BHRs) are the dark matter, but the idea is somewhat vague. Recently we argued that the generalized uncertainty principle (GUP) may prevent black holes from evaporating completely, in a similar way that the standard uncertainty principle prevents the hydrogen atom from collapsing. We further noted that the hybrid inflation model provides a plausible mechanism for production of large numbers of small black holes. Combining these we suggested that the dark matter might be composed of Planck-size BHRs. In this paper we briefly review these arguments, and discuss the reheating temperature as a result of black hole evaporation. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Chen, P (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 28 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-407-3 PY 2003 BP 497 EP 503 PG 7 WC Physics, Multidisciplinary SC Physics GA BX87S UT WOS:000186708100048 ER PT B AU Engelmann, C Geist, A AF Engelmann, C Geist, A GP IEEE COMPUTER SOCIETY IEEE COMPUTER SOCIETY TI A diskless checkpointing algorithm for super-scale architectures applied to the fast Fourier transform SO PROCEEDINGS OF THE INTERNATIONAL WORKSHOP ON CHALLENGES OF LARGE APPLICATIONS IN DISTRIBUTED ENVIRONMENTS LA English DT Proceedings Paper CT International Workshop on Challenges of Large Application in Distributed Environments (CLADE 2003) CY JUN 21, 2003 CL SEATTLE, WA SP IEEE Comp Soc, Soc Modeling & Simulat Int, Pacific NW Natl Lab, ERC, Mississippi State Univ, Ctr Adv TelesysMatics Univ Arziona, Arizona Ctr Integrat Modelling & Sumulat AB This paper discusses the issue of fault-tolerance in distributed computer systems with tens or hundreds of thousands of diskless processor units. Such systems, like the IBM BlueGene/L, are predicted to be deployed in the next five to ten years. Since a 100,000-processor system is going to be less reliable, scientific applications need to be able to recover from occurring failures more efficiently. In this paper we adapt the present technique of diskless checkpointing to such huge distributed systems in order to equip existing scientific algorithms with super-scalable fault-tolerance. First, we discuss the method of diskless checkpointing, then we adapt this technique to super-scale architectures and finally we present results from an implementation of the Fast Fourier Transform that uses the adapted technique to achieve super-scale fault-tolerance. C1 Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA. RP Engelmann, C (reprint author), Oak Ridge Natl Lab, Comp Sci & Math Div, POB 2008, Oak Ridge, TN 37831 USA. OI Engelmann, Christian/0000-0003-4365-6416 NR 10 TC 7 Z9 10 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA BN 0-7695-1984-9 PY 2003 BP 47 EP 52 DI 10.1109/CLADE.2003.1209999 PG 6 WC Computer Science, Theory & Methods SC Computer Science GA BX16G UT WOS:000184467200007 ER PT B AU Otoo, E Rotem, D Shoshani, A AF Otoo, E Rotem, D Shoshani, A GP IEEE COMPUTER SOCIETY IEEE COMPUTER SOCIETY TI Impact of admission and cache replacement policies on response times of jobs on data grids SO PROCEEDINGS OF THE INTERNATIONAL WORKSHOP ON CHALLENGES OF LARGE APPLICATIONS IN DISTRIBUTED ENVIRONMENTS LA English DT Proceedings Paper CT International Workshop on Challenges of Large Application in Distributed Environments (CLADE 2003) CY JUN 21, 2003 CL SEATTLE, WA SP IEEE Comp Soc, Soc Modeling & Simulat Int, Pacific NW Natl Lab, ERC, Mississippi State Univ, Ctr Adv TelesysMatics Univ Arziona, Arizona Ctr Integrat Modelling & Sumulat AB Caching techniques have been used widely to improve the performance gaps of storage hierarchies in computing systems. Little is known about the impact of policies on the response times of jobs that access and process very large files in data grids particularly when data and computations on the data have to be co-located on the same host. In data intensive applications that access large data files over wide area network environment, such as data-grids, the combination of policies for job servicing (or scheduling), caching and cache replacement can significantly impact the performance of grid jobs. We present some preliminary results of a simulation stud), that combines an admission policy with a cache replacement policy when servicing jobs submitted to a storage resource manager The results show that, in comparison to a first come first serve policy, the response times of jobs are significantly improved, for practical limits of disk cache sizes, when the jobs that are back-logged to access the same files are taken into consideration in scheduling the next file to be retrieved into the disk cache. Not only are the response times of jobs improved, but also the metric measures for caching policies, such as the hit ratio and the average cost per retrieval, are improved irrespective of the cache replacement policy C1 Univ Calif Berkeley, Lawrence Berkeley Nalt Lab, Berkeley, CA 94720 USA. RP Otoo, E (reprint author), Univ Calif Berkeley, Lawrence Berkeley Nalt Lab, 1 Cyclotron Rd,MS 50B-3238, Berkeley, CA 94720 USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA BN 0-7695-1984-9 PY 2003 BP 113 EP 123 DI 10.1109/CLADE.2003.1210007 PG 11 WC Computer Science, Theory & Methods SC Computer Science GA BX16G UT WOS:000184467200015 ER PT B AU Black, D Harada, M Schechter, J AF Black, D Harada, M Schechter, J BE Ahmady, MR Fariborz, AH TI Study of scalar mesons and related radiative decays SO PROCEEDINGS OF THE SUNY INSTITUTE OF TECHNOLOGY CONFERENCE ON THEORETICAL HIGH ENERGY PHYSICS LA English DT Proceedings Paper CT 2nd Conference on Theoretical High Energy Physics CY JUN 06, 2002 CL SUNY Inst Technol, Utica, NY SP SUNY Inst Technol, Sch Art & Sci, SUNY Inst Technol Off Conf Serv & Sponsored Res HO SUNY Inst Technol ID CHIRAL PERTURBATION-THEORY; PI-PI-SCATTERING; Q(Q)OVER-BAR NONET; A(0)(980); HADRONS; SEARCH; QUARK AB After a brief review of the puzzling light scalar meson sector of QCD, a brief summary will be given of a paper concerning radiative decays involving the light scalars. There, a simple vector meson dominance model is constructed in an initial attempt to relate a large number of the radiative decays involving a putative scalar nonet to each other. As an application it is illustrated why a(0)(980) - f(0)(980) mixing is not expected to greatly alter the f(0)/a(0) production ratio for radiative phi decays. C1 Jefferson Lab, Theory Grp, Newport News, VA 23606 USA. RP Black, D (reprint author), Jefferson Lab, Theory Grp, 12000 Jefferson Ave, Newport News, VA 23606 USA. EM dblack@jlab.org; harada@eken.phys.nagoya-u.ac.jp; schechte@physics.syr.edu NR 37 TC 0 Z9 0 U1 0 U2 0 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA BUILDING M-55, OTTAWA, ON KIA OR6, CANADA BN 0-660-19065-6 PY 2003 BP 13 EP 23 PG 11 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BAP84 UT WOS:000223170400002 ER PT B AU Baktash, C AF Baktash, C BE Hamilton, JH Ramayya, AV Carter, HK TI Nuclear structure studies with ISOL beams at the HRIBF SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RP Baktash, C (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 30 EP 31 PG 2 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200004 ER PT B AU Dean, DJ AF Dean, DJ BE Hamilton, JH Ramayya, AV Carter, HK TI Coupled-cluster theory for nuclear science SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res ID ELECTRON CORRELATION THEORIES; BODY PERTURBATION-THEORY; SHELL-MODEL AB I discuss an initial implementation of the coupled-cluster method for nuclear structure calculations and apply our method to (4)He. In this procedings I will discuss the effect of center-of-mass removal on our results. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RP Dean, DJ (reprint author), Oak Ridge Natl Lab, Div Phys, POB 2008, Oak Ridge, TN 37831 USA. EM deanj@ornl.gov NR 24 TC 0 Z9 0 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 101 EP 108 PG 8 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200014 ER PT B AU Grzywacz, R Sawicka, M Pfutzner, M Daugas, JM Grawe, H Matea, I Becker, F Belier, G Bingham, CR Borcea, R Bouchez, E Buta, A Dragulescu, E Georgiev, G Giovinazzo, J Ibrahim, F Hammache, F Mayet, P Meot, V Lewitowicz, M de Olivieira, F Negoita, F Perru, O Roig, O Rykaczewski, K Saint-Laurent, MG Sauvestre, JE Sorlin, O Stanoiu, M Stefan, I Stodel, C Theisen, C Verney, D AF Grzywacz, R Sawicka, M Pfutzner, M Daugas, JM Grawe, H Matea, I Becker, F Belier, G Bingham, CR Borcea, R Bouchez, E Buta, A Dragulescu, E Georgiev, G Giovinazzo, J Ibrahim, F Hammache, F Mayet, P Meot, V Lewitowicz, M de Olivieira, F Negoita, F Perru, O Roig, O Rykaczewski, K Saint-Laurent, MG Sauvestre, JE Sorlin, O Stanoiu, M Stefan, I Stodel, C Theisen, C Verney, D BE Hamilton, JH Ramayya, AV Carter, HK TI Neutron-rich nickel and cobalt nuclei - New results from fragmentation studies SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res ID MU-S-ISOMERS; SHELL-MODEL; DECAY; IDENTIFICATION; ISOTOPES; MAGICITY; NI AB Beta-delayed and isomer gamma rays emitted by the very neutron-rich nuclei around Ni-74 have been measured using fragmentation of the Kr-86 beam at 58 AMeV and the new LISE 2000 spectrometer and EXOGAM germanium array. We have successfully measured beta-delayed gammas from the decay of Co-72. The energies for the lowest excited states in Ni-72 are proposed, with a first 2(+) state at 1096 keV. These experimental findings can be related to the problem of non-observation of the 8(+) isomer in Ni-72. We also measured beta decay from other neutron-rich Co isotopes including Co-70. Evidence was found for a new short-lived isomer in Ni-76, most likely the I-pi=8(+) state. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37830 USA. RP Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37830 USA. EM grzywacz@mail.phy.ornl.gov; pfutzner@mimuw.edu.pl; cbingham@utk.edu; lewitowicz@ganil.fr; rykaczew@mail.phy.ornl.gov RI Hammache, Fairouz/K-6132-2016 NR 23 TC 0 Z9 0 U1 0 U2 3 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 135 EP 142 PG 8 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200018 ER PT B AU Batchelder, JC Bilheux, JC Bingham, CR Carter, HK Cole, JD Fong, D Garrett, PE Grzywacz, R Hamilton, JH Hartley, DJ Hwang, JK Krolas, W Kulp, D Larochelle, Y Piechaczek, A Ramayya, AV Rykaczewski, KP Spejewski, EH Stracener, DW Tantawy, MN Winger, JA Wood, J Zganjar, EF Casares, A Radford, D Wollnik, H AF Batchelder, JC Bilheux, JC Bingham, CR Carter, HK Cole, JD Fong, D Garrett, PE Grzywacz, R Hamilton, JH Hartley, DJ Hwang, JK Krolas, W Kulp, D Larochelle, Y Piechaczek, A Ramayya, AV Rykaczewski, KP Spejewski, EH Stracener, DW Tantawy, MN Winger, JA Wood, J Zganjar, EF Casares, A Radford, D Wollnik, H BE Hamilton, JH Ramayya, AV Carter, HK TI Decay of the neutron rich nucleus Ag-116 SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res ID ISOTOPES AB The decay of the neutron-rich nucleus Ag-116 was studied. Through the use of conversion electron, beta and gamma spectroscopy, we have discovered a new short-lived isomer in Ag-116. The conversion electron data shows previously unknown electron peaks at 22.5, 44.3, and 47.2 keV with half-lives of similar to 16 seconds each. These are interpreted as the K, L, and M conversion electron lines resulting from a 48 keV transition associated with the decay of a third isomer of Ag-116. C1 Oak Ridge Associated Univ, UNIRIB, Oak Ridge, TN 37831 USA. RP Batchelder, JC (reprint author), Oak Ridge Associated Univ, UNIRIB, POB 2008, Oak Ridge, TN 37831 USA. RI Krolas, Wojciech/N-9391-2013; radford, David/A-3928-2015; Bilheux, Jean/A-2823-2016 OI Bilheux, Jean/0000-0003-2172-6487 NR 9 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 221 EP 226 PG 6 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200030 ER PT B AU Rasmussen, JO Gilat, J Wu, SC Luo, Y Hwang, JK Ramayya, AV Hamilton, JH Zhu, SJ Xu, RQ Donangelo, R AF Rasmussen, JO Gilat, J Wu, SC Luo, Y Hwang, JK Ramayya, AV Hamilton, JH Zhu, SJ Xu, RQ Donangelo, R BE Hamilton, JH Ramayya, AV Carter, HK TI Band structures in fission fragments of rhodium and neighbors SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res ID HIGH-SPIN; ISOTOPES; NUCLEI AB We present level schemes from fission-gamma spectroscopy in the region of triaxiality around Rh110-113, studied by our Gammasphere collaboration. We will here emphasize features involving one or more impaired nucleons in high-j orbitals, g(9/2) protons and h(11/2) neutrons. Backbending and bifurcation is observed between rotational frequencies of 0.32 and 0.39 MeV for the odd-even nuclei but not for the odd-odd. Possible chiral doublets in 3-quasiparticle states above the backbend in Rh-111 and in Rh-113 are noted. We note that signature-splitting patterns in odd-even, g(9/2) bands of the region indicate a shape somewhat on the prolate side of maximum triaxiality for the g(9/2) ground bands of Rh-109,Rh-111,Rh-113. The more deformed K = 1/2 intruder bands from proton orbitals above the Z = 50 shell are probably prolate spheroidal, a case of shape coexistence. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. EM JORasmussen@lbl.gov; YXLuo@lbl.gov; zhushj@mail.tsinghua.edu.cn; donangel@if.ufrj.br NR 19 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 244 EP 251 PG 8 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200034 ER PT B AU Fotiades, N Cizewski, JA Krucken, R McNabb, DP Becker, JA Bernstein, LA Younes, W Clark, RM Fallon, P Lee, IY Macchiavelli, AO AF Fotiades, N Cizewski, JA Krucken, R McNabb, DP Becker, JA Bernstein, LA Younes, W Clark, RM Fallon, P Lee, IY Macchiavelli, AO BE Hamilton, JH Ramayya, AV Carter, HK TI Observation of unusually neutron-deficient fission fragments in heavy-ion-induced fusion reactions SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res AB Unusually neutron-deficient heavy fragments were observed in the fission of the compound system formed in two different heavy-ion induced reactions and studied with the Gammasphere array. The enhanced production of unusually neutron-deficient fragments cannot be reproduced by statistical calculations and supports very neutron-rich complementary fragments near Fe-68. In conjunction with the observation of neutron-rich light fission fragments in other work, the present results provide support for a new asymmetric fission mode associated with the increased stability of nuclei near Ni-70. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Fotiades, N (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 6 TC 0 Z9 0 U1 1 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 282 EP 287 PG 6 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200040 ER PT B AU Patin, JB Stoyer, MA Moody, KJ Shaughnessy, DA Stoyer, NJ Wild, JF Wooddy, PT Gutman, E AF Patin, JB Stoyer, MA Moody, KJ Shaughnessy, DA Stoyer, NJ Wild, JF Wooddy, PT Gutman, E BE Hamilton, JH Ramayya, AV Carter, HK TI Gamma spectroscopy of U-235 and Pa-234m SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res AB Measurement of the gamma ray energies and intensities of U-235 and Pa-234m enable those in Safeguards and Security to accurately identify and quantify amounts of U-235 and U-238. The most intense gamma ray lines in U-235, U-238, Th-234 and Pa-234 are all less then 290 keV. Without knowing the conditions of a measurement, we could measure these gamma ray lines and intensities inaccurately, leading to an incorrect identification of an isotope and its quantity. Two separate experiments were performed to measure the intensities of the gamma rays with energies greater then 290 keV in U-235 and Pa-234m. Higher energy gamma rays are attenuated less by their environment, making accurate identifications probable. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Patin, JB (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94551 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 306 EP 309 PG 4 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200045 ER PT B AU Bardayan, DW Batchelder, JC Blackmon, JC Brune, CR Champagne, AE Cizewski, JA Davinson, T Greife, U James, AN Johnson, M Kozub, RL Liang, JF Livesay, RJ Ma, Z Nesaraja, CD Radford, DC Shapira, D Smith, MS Thomas, JS Woods, PJ Zganjar, E AF Bardayan, DW Batchelder, JC Blackmon, JC Brune, CR Champagne, AE Cizewski, JA Davinson, T Greife, U James, AN Johnson, M Kozub, RL Liang, JF Livesay, RJ Ma, Z Nesaraja, CD Radford, DC Shapira, D Smith, MS Thomas, JS Woods, PJ Zganjar, E CA UNIRIB Collaboration BE Hamilton, JH Ramayya, AV Carter, HK TI The single-particle structure of neutron-rich nuclei of astrophysical interest at the ORNL HRIBF SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res AB The rapid neutron-capture process (r process) produces roughly half of the elements heavier than iron. The path and abundances produced are uncertain, however, because of the lack of nuclear structure information on important neutron-rich nuclei. We are studying nuclei on or near the r-process path via single-nucleon transfer reactions on neutron-rich radioactive beams at ORNL's Holifield Radioactive Ion Beam Facility (HRIBF). Owing to the difficulties in studying these reactions in inverse kinematics, a variety of experimental approaches are being developed. We present the experimental methods and initial results. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RP Bardayan, DW (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RI radford, David/A-3928-2015 NR 11 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 361 EP 368 PG 8 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200053 ER PT B AU Smith, MS Meyer, RA AF Smith, MS Meyer, RA BE Hamilton, JH Ramayya, AV Carter, HK TI Nuclear data on neutron-rich nuclei for astrophysics SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res AB To understand the stellar origins of the heavy elements in supernovae, a knowledge of the structure of, and reactions involving, thousands of neutron-rich nuclei are essential. To ensure that the latest experimental and theoretical information on these nuclei is incorporated in element synthesis models, dedicated efforts in data compilation, evaluation, dissemination, and coordination are needed. Strategies to improve the utilization of nuclear data for astrophysics studies are described, including establishing an Astrophysics Data Coordinator position, a new web site to aid in locating available nuclear data sets, www.nucastrodata.org, and a new visualization program with an easy-to-use graphical user interface to over 8000 reaction rates. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RP Smith, MS (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 377 EP 379 PG 3 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200055 ER PT B AU Lynn, JE Hayes, AC AF Lynn, JE Hayes, AC BE Hamilton, JH Ramayya, AV Carter, HK TI Fission barrier physics, resonance fluctuations and isomer fission cross-sections SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res AB Although the main picture of fission barrier physics was established some time ago many of the details still have to be settled. Consequently, the application to evaluation of cross-sections of unmeasurable or exotic nuclides and their excited states is still in its early stages. In this paper I consider some of these details and explore the possibility of quantitative estimation of fission cross-sections. Special examples include the isomer of U-235 and U-232. C1 Los Alamos Natl Lab, Grp T 16, Los Alamos, NM 87545 USA. RP Lynn, JE (reprint author), Los Alamos Natl Lab, Grp T 16, POB 1663, Los Alamos, NM 87545 USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 439 EP 447 PG 9 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200063 ER PT B AU Jiang, CL Esbensen, H Rehm, KE Back, BB Janssens, RVF Caggiano, JA Collon, P Greene, J Heinz, AM Henderson, DJ Nishinaka, I Pennington, TO Seweryniak, D AF Jiang, CL Esbensen, H Rehm, KE Back, BB Janssens, RVF Caggiano, JA Collon, P Greene, J Heinz, AM Henderson, DJ Nishinaka, I Pennington, TO Seweryniak, D BE Hamilton, JH Ramayya, AV Carter, HK TI New behavior of heavy-ion fusion reactions at extreme sub-barrier energies SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res ID BARRIER FUSION; CROSS-SECTIONS; DISTRIBUTIONS; SYSTEMS AB The excitation function for fusion-evaporation in the Ni-60 + Y-89 system was measured over a range in cross section covering six orders of magnitude. The cross section exhibits an abrupt decrease at extreme sub-barrier energies. This behavior, which is also present in a few other systems found in the literature, cannot be reproduced with present models, including those based on a coupled-channels approach. Possible causes are discussed, including a dependence on the intrinsic structure of the participants. C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Jiang, CL (reprint author), Argonne Natl Lab, Div Phys, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Heinz, Andreas/E-3191-2014 NR 20 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 480 EP 486 PG 7 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200069 ER PT B AU Shaughnessy, DA Dardenne, YMXM Kenneally, JM Laue, CA Moody, KJ Patin, JB Stoyer, MA Stoyer, NJ Wild, JF AF Shaughnessy, DA Dardenne, YMXM Kenneally, JM Laue, CA Moody, KJ Patin, JB Stoyer, MA Stoyer, NJ Wild, JF BE Hamilton, JH Ramayya, AV Carter, HK TI Development of a U-235m generator for measurement of neutron cross sections SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res ID ORGANIC SOLUTIONS; ELECTRODEPOSITION; TARGETS AB We are currently developing an online U-235 generator. Initial tests were performed with U-232, which was electroplated on the inside of a 50-cm long, 1-cm diameter Ni tube at a current density of 2 mA/cm(2) with a plating efficiency of 92%. He or Ar was swept through the tube to collect the recoil activity and deposit it on a Pt plate for counting. At did not deposit any activity, but collections made with He were approximately 1% efficient, and the amount of activity collected increased with flow rate. Future experiments will hopefully increase the amount of activity collected from the generator. C1 Lawrence Livermore Natl Lab, Analyt & Nucl Chem Div, Livermore, CA 94551 USA. RP Shaughnessy, DA (reprint author), Lawrence Livermore Natl Lab, Analyt & Nucl Chem Div, POB 808,L-231, Livermore, CA 94551 USA. NR 6 TC 0 Z9 0 U1 1 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 576 EP 579 PG 4 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200084 ER PT B AU Stoyer, MA Moody, KJ Wild, JF Patin, JB Shaughnessy, DA Stoyer, NJ Harris, LJ AF Stoyer, MA Moody, KJ Wild, JF Patin, JB Shaughnessy, DA Stoyer, NJ Harris, LJ BE Hamilton, JH Ramayya, AV Carter, HK TI Cross-section measurements with the Radioactive Isotope Accelerator (RIA) SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res AB RIA will produce beams of exotic nuclei of unprecedented luminosity. Preliminary studies of the feasibility of measuring cross-sections of interest to the science based stockpile stewardship (SBSS) program will be presented, and several experimental techniques will be discussed. Cross-section modeling attempts for the A = 95 mass region will be shown. In addition, several radioactive isotopes could be collected for target production or medical isotope purposes while the main in-beam experiments are running. The inclusion of a broad range mass analyzer (BRAMA) capability at RIA will enable more effective utilization of the facility, enabling the performance of multiple experiments at the same time. This option will be briefly discussed. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Stoyer, MA (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 604 EP 610 PG 7 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200089 ER PT B AU Rykaczewski, KP AF Rykaczewski, KP BE Hamilton, JH Ramayya, AV Carter, HK TI Digital signal processing in decay studies SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res ID MU-S-ISOMERS; PROTON RADIOACTIVITY; DEFORMED-NUCLEI; FINE-STRUCTURE; DETECTOR; SPECTROSCOPY; IDENTIFICATION; FRAGMENTATION; PERFORMANCE; SYSTEM AB The development of a data acqusition system based on digital processing of detector signals is described. This system, initiated within the UNIRIB collaboration, was developed originally for proton radioactivity studies at the Holifield Radioactive Ion Beam Facility. It was applied successfully for gamma- and beta-spectroscopy, as well as in decay studies of the relativistic heavy-ion fragmentation products. A short summary of the results achieved with this system and the possible future applications are given. C1 Oak Ridge Natl Lab, Phys Div, Oak Ridge, TN 37830 USA. RP Rykaczewski, KP (reprint author), Oak Ridge Natl Lab, Phys Div, POB 2008, Oak Ridge, TN 37830 USA. NR 39 TC 1 Z9 1 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 624 EP 629 PG 6 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200092 ER PT B AU Greene, G AF Greene, G BE Hamilton, JH Ramayya, AV Carter, HK TI The fundamental properties of the neutron SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res C1 Oak Ridge Natl Lab, Phys Div, Oak Ridge, TN 37831 USA. RP Greene, G (reprint author), Oak Ridge Natl Lab, Phys Div, POB 2008, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 630 EP 630 PG 1 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200093 ER PT B AU Cole, JD Drigert, MW Aryaeinejad, R Reber, EL Jewell, JK Hamilton, JH Ramayya, AV Ter-Akopian, GM Oganessian, TY Daniel, AV Janssens, RVF Wiedenhover, I Klann, R AF Cole, JD Drigert, MW Aryaeinejad, R Reber, EL Jewell, JK Hamilton, JH Ramayya, AV Ter-Akopian, GM Oganessian, TY Daniel, AV Janssens, RVF Wiedenhover, I Klann, R BE Hamilton, JH Ramayya, AV Carter, HK TI Induced fission studies: Experimental capabilities, data correlations, and applications SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res AB The current experimental configuration and its capabilities, as well as planned improvements and additional capabilities will be presented. The status of appropriate actinide target samples will be presented. This will include the samples currently available as well as future sample plans. The importance and use of the correlated event-by-event parameter information for extracting information about the fundamental fission process will be discussed. The importance of both the experimental techniques and the information extracted for specific applications will be outlined. C1 Bechtel BWXT Idaho LLC, INEEL, Idaho Falls, ID 83415 USA. RP Cole, JD (reprint author), Bechtel BWXT Idaho LLC, INEEL, Idaho Falls, ID 83415 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 631 EP 638 PG 8 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200094 ER PT B AU Moretto, LG Elliott, JB Phair, L Wozniak, GJ AF Moretto, LG Elliott, JB Phair, L Wozniak, GJ BE Hamilton, JH Ramayya, AV Carter, HK TI Thermal emission of intermediate mass fragments and the liquid-vapor phase transition SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res ID MULTIFRAGMENTATION; REDUCIBILITY AB We study the origin of anomalous caloric curves and negative heat capacities in the liquid-gas coexistence region. Coexistence is described in terms of clusterization in the vapor according to Fisher's formula. Multifragmentation data are used to determine the liquid-vapor coexistence line. The phase diagram is obtained for the finite system and an extrapolation is made to infinite nuclear matter. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. RP Moretto, LG (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, 1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 702 EP 711 PG 10 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200103 ER PT B AU Geesaman, DF AF Geesaman, DF BE Hamilton, JH Ramayya, AV Carter, HK TI Progress on the concepts and design of the rare isotope accelerator SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res AB The Rare Isotope Accelerator is a bold initiative for the U.S. nuclear science community that promises to revolutionize studies of the primary topics of this workshop: fission and neutron-rich nuclei. In this talk, a perspective on the role of RIA in enabling major progress in nuclear structure and nuclear reaction research and some important recent steps in technical progress for RIA are reviewed. The current status of RIA in the DOE project process and the actions needed by the scientific community are also discussed in the context of the worldwide mobilization for rare isotope beams and the goals of nuclear science for the next decade. C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Geesaman, DF (reprint author), Argonne Natl Lab, Div Phys, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 761 EP 769 PG 9 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200110 ER PT B AU Beene, JR AF Beene, JR BE Hamilton, JH Ramayya, AV Carter, HK TI The Holifield radioactive ion beam facility, present and future SO PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI LA English DT Proceedings Paper CT 3rd International Conference on Fission and Properties of Neutron-Rich Nuclei CY NOV 03-09, 2002 CL Sanibel Isl, FL SP Vanderbilt Univ, UNIRIB, Oak Ridge Associated Univ, Oak Ridge Natl Lab, Joint Inst Heavy Ion Res AB The Holifield Radioactive Ion Beam Facility was developed to take advantage of an existing accelerator complex, and to provide the U.S. with an ISOL (isotope separation on-line) radioactive ion beam facility. In spite of the very modest initial investment, the HRIBF is now producing a steady stream of important scientific results. This paper briefly reviews the operation of the facility, outlines some recent developments, and discusses how these have been applied to our scientific program. Finally, a brief discussion is provided of our vision of the development of the HIRBF during the roughly ten-year period that separates us from the availability of RIA. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RP Beene, JR (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. EM beenejr@ornl.gov NR 19 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-238-386-7 PY 2003 BP 789 EP 798 PG 10 WC Physics, Nuclear SC Physics GA BCK48 UT WOS:000229749200114 ER PT B AU Ding, C He, XF Husbands, P Zha, HY Simon, H AF Ding, C He, XF Husbands, P Zha, HY Simon, H BE Barbara, D Kamath, C TI PageRank, HITS and a unified framework for link analysis SO PROCEEDINGS OF THE THIRD SIAM INTERNATIONAL CONFERENCE ON DATA MINING SE SIAM PROCEEDINGS SERIES LA English DT Proceedings Paper CT 3rd SIAM International Conference on Data Mining CY MAY 01-03, 2003 CL SAN FRANCISCO, CA AB Two popular webpage ranking algorithms are HITS and PageRank. HITS emphasizes mutual reinforcement between authority and hub webpages, while PageRank emphasizes hyperlink weight normalization and web surfing based on random walk models. We systematically generalize/combine these concepts into a unified framework. The ranking framework contains a large algorithm space; HITS and PageRank are two extreme ends in this space. We study several normalized ranking algorithms which are intermediate between HITS and PageRank, and obtain closed-form solutions. We show that, to first order approximation, all ranking algorithms in this framework, including PageRank and HITS, lead to same ranking which is highly correlated with ranking by indegree. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, NERSC Div, Berkeley, CA 94720 USA. RP Ding, C (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, NERSC Div, Berkeley, CA 94720 USA. NR 6 TC 3 Z9 3 U1 0 U2 0 PU SIAM PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA BN 0-89871-545-8 J9 SIAM PROC S PY 2003 BP 249 EP 253 PG 5 WC Computer Science, Information Systems; Computer Science, Software Engineering SC Computer Science GA BX26M UT WOS:000184780800024 ER PT S AU Gatti-Bono, C Perkins, NC AF Gatti-Bono, C Perkins, NC BE Chung, JS Matsui, T TI Numerical simulations of cable/seabed interaction SO PROCEEDINGS OF THE THIRTEENTH (2003) INTERNATIONAL OFFSHORE AND POLAR ENGINEERING CONFERENCE, VOL 2 SE International Offshore and Polar Engineering Conference Proceedings LA English DT Proceedings Paper CT 13th International Offshore and Polar Engineering Conference (ISOPE-2003) CY MAY 25-30, 2003 CL HONOLULU, HI DE cable dynamics; elastica; towed cable; cable laying; seabed modeling ID DYNAMICS AB This paper contributes a method to model the interactions of low-tension cables with the seabed. The cable is modeled as an elastica, and can support tension, torsion and two-axis bending. It is subjected to hydrodynamic forces as well as self-weight, buoyancy, and seabed contact. The seabed is modeled as an elastic foundation with linear damping and prescribed topology. A numerical algorithm is briefly described and then used to simulate cable laying. Several examples are studied including a cable towed in deep water, dropped on an uneven seabed, and finally, towed across an uneven seabed. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Gatti-Bono, C (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 19 TC 2 Z9 2 U1 0 U2 1 PU INTERNATIONAL SOCIETY OFFSHORE& POLAR ENGINEERS PI CUPERTINO PA PO BOX 189, CUPERTINO, CA 95015-0189 USA SN 1098-6189 BN 1-880653-60-5 J9 INT OFFSHORE POLAR E PY 2003 BP 120 EP 126 PG 7 WC Engineering, Marine; Engineering, Ocean; Engineering, Geological SC Engineering GA BAP49 UT WOS:000223132100017 ER PT B AU Preece, DS Chung, SH AF Preece, DS Chung, SH GP ISEE TI Blasting induced rock fragmentation prediction using the RHT constitutive model for brittle materials SO PROCEEDINGS OF THE TWENTY-NINTH ANNUAL CONFERENCE ON EXPLOSIVES AND BLASTING TECHNIQUE, VOL 2 LA English DT Proceedings Paper CT 29th Annual Conference on Explosives and Blasting Technique CY FEB 02-05, 2003 CL Nashville, TN SP Int Soc Explos Engineers AB Blasting induced rock fragmentation is an art that has been developed and refined for hundred's of years through blasting and recording the results. Good blasting fragmentation practices were thus developed through experience. However, this method requires a history that is typically developed in a mine over a number of years and sometimes at considerable expense. Quantification of fragmentation as a function of rock-mass characteristics and blast design is attractive. Developments towards this end have included semi-empirical methods as well as computer codes that explicitly treat shock wave transmission and the subsequent rock breakage. This paper will present predictions of fragmentation resulting from rock blasting using the computer code AUTODYN and a new state- of- the- art material model for brittle rock and concrete. C1 Sandia Natl Labs, Livermore, CA 94550 USA. RP Preece, DS (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA. NR 7 TC 0 Z9 0 U1 1 U2 4 PU INT SOC EXPLOSIVES ENGINEERS PI CLEVELAND PA 29100 AURORA ROAD, CLEVELAND, OH 44139-1800 USA PY 2003 BP 375 EP 381 PG 7 WC Engineering, Mechanical; Mining & Mineral Processing SC Engineering; Mining & Mineral Processing GA BAT24 UT WOS:000223422800032 ER PT B AU Heilmann, I Perera, IY Boss, WF AF Heilmann, I Perera, IY Boss, WF BE Schnarrenberger, C WittmannLiebold, B TI Phosphoinositide signaling, lipid pools, and PI kinase isoforms in plants SO PROCEEDINGS OF THE XII INTERNATIONAL CONGRESS ON GENES, GENE FAMILIES, AND ISOZYMES LA English DT Proceedings Paper CT 12th International Congress on Genes, Gene Families and Isozymes CY JUL 19-24, 2003 CL Berlin, GERMANY ID PHOSPHATIDYLINOSITOL 4,5-BISPHOSPHATE; NUCLEOTIDE SENSITIVITY; BINDING-PROTEIN; METABOLISM; CHANNELS; ENZYMES; CULTURE; CELLS AB The phosphoinositide (PI) pathway has been extensively studied in animals, and for some time also in plants, mostly regarding the pathway's involvement in cellular signaling. However, PIs can have a multitude of regulatory functions in eukaryotic cells which may all be part of an orchestrated cellular response to stimulation. In order to understand how a variety of cellular processes may be regulated by PIs, our view of PI signaling must be integrated with that of other PI functions. A key question to this end is how PIs are distributed and organized in the cell, and how this orga-ni-zation is generated and maintained. It is our hypothesis that subsets of PI kinase isoforms govern PI pools in various cellular compartments, such as the plasma membrane or the cytoskeleton. Data from a red alga and transgenic tobacco cells support this hypothesis. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Heilmann, I (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU MEDIMOND PUBLISHING CO PI BOLOGNA PA VIA RUBBIANI 6/2, 40124 BOLOGNA, ITALY BN 88-7587-006-3 PY 2003 BP 73 EP 79 PG 7 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA BY68G UT WOS:000189437900014 ER PT S AU Bingham, PR Price, JR Tobin, KW Karnowski, TP Bennett, MH Bogardus, H Bishop, M AF Bingham, PR Price, JR Tobin, KW Karnowski, TP Bennett, MH Bogardus, H Bishop, M BE Tobin, KW Emami, I TI Sidewall structure estimation from CD-SEM for lithographic process control SO PROCESS AND MATERIALS CHARACTERIZATION AND DIAGNOSTICS IN IC MANUFACTURING SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Process and Materials Characterization and Diagnostics in IC Manufacturing CY FEB 27-28, 2003 CL SANTA CLARA, CA SP SPIE DE sidewall structure; semiconductor manufacturing; content-based image retrieval; critical dimension AB In semiconductor device manufacturing, critical dimension (CD) metrology provides a measurement for precise line-width control during the lithographic process. Currently scanning electron microscope (SEM) tools are typically used for this measurement, because the resolution requirements for the CD measurements are outside the range of optical microscopes. While CD has been a good feedback control for the lithographic process, line-widths continue to shrink and a more precise measurement of the printed lines is needed. With decreasing line widths, the entire sidewall structure must be monitored for precise process control. Sidewall structure is typically acquired by performing a destructive cross sectioning of the device, which is then imaged with a SEM tool. Since cross sectioning is destructive and slow, this is an undesirable method for testing product wafers and only a small sampling of the wafers can be tested. We have developed a technique in which historical cross section/top down image pairs are used to predict sidewall shape from top down SEM images. Features extracted from a new top down SEM image are used to locate similar top downs within the historical database and the corresponding cross sections in the database are combined to create a sidewall estimate for the new top down. Testing with field test data has shown the feasibility of this approach and that the approach will allow CD SEM tools to provide cross section estimates with no change in hardware or complex modeling. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Bingham, PR (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 7 TC 2 Z9 2 U1 0 U2 1 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-4846-X J9 P SOC PHOTO-OPT INS PY 2003 VL 5041 BP 115 EP 126 DI 10.1117/12.485229 PG 12 WC Engineering, Manufacturing; Instruments & Instrumentation; Materials Science, Characterization & Testing SC Engineering; Instruments & Instrumentation; Materials Science GA BX34D UT WOS:000184995600013 ER PT B AU Liu, YH Thom, AJ Kramer, MJ Akinc, M AF Liu, YH Thom, AJ Kramer, MJ Akinc, M BE Srivatsan, TS Varin, RA TI Processing and oxidation behavior of Nb-Si-B intermetallics SO PROCESSING AND FABRICATION OF ADVANCED MATERIALS XI LA English DT Proceedings Paper CT International Symposium on Processing and Fabrication of Advanced Materials XI CY OCT 07-10, 2002 CL COLUMBUS, OH SP ASM Int ID MICROSTRUCTURE AB Single phase materials of alpha-Nb5Si3, Nb-5(Si,B)(3) (T2) and Nb5Si3Bx (D8(8)) in the Nb-Si-B system were prepared by powder metallurgy processing. T2 was almost fully dense, while alpha-Nb5Si3 and D8(8) were porous after sintering at 1900degreesC for 2 hours. The lattice parameters of T2 decreased linearly with the substitution of B for Si. Isothermal oxidation testing at 1000degreesC in flowing air indicated that the oxidation resistances of T2 and D8(8) are much better than alpha-Nb5Si3, but still extremely poor compared to the boron-modified Mo5Si3. Extensive cracking in the oxide scale and matrix were observed and arose from the volume expansion associated with the formation of Nb2O5 and boron-containing silica glass. C1 Iowa State Univ, Ames Lab, Ames, IA 50011 USA. RP Liu, YH (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50011 USA. NR 18 TC 3 Z9 3 U1 1 U2 2 PU ASM INTERNATIONAL PI MATERIALS PARK PA 9503 KINSMAN RD, MATERIALS PARK, OH 44073 USA BN 0-87170-782-9 PY 2003 BP 258 EP 271 PG 14 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Composites SC Materials Science; Metallurgy & Metallurgical Engineering GA BW54P UT WOS:000182376200019 ER PT B AU Schwarz, RB Shen, TD AF Schwarz, RB Shen, TD BE Shaw, LL Suryanarayana, C Mishra, RS TI High-strength, high conductivity bulk nanostructured Ag-Cu alloys SO PROCESSING AND PROPERTIES OF STRUCTURAL NANOMATERIALS LA English DT Proceedings Paper CT Symposium on Processing and Properties of Structural Materials held at the 2003 TMS Fall Meeting CY NOV 09-12, 2003 CL CHICAGO, IL SP Minerals Met & Mat Soc ID FERROMAGNETIC GLASSES; WIRES; MICROSTRUCTURE; NANOCOMPOSITE; DEFORMATION; CONDUCTORS; MAGNETS; FIELD AB Researchers are interested in developing high-strength and high conductivity alloys for use in high-field pulsed electromagnets. We have used a fluxing and quenching technique to prepare 5-mm diameter rods of Ag-Cu alloys with nanosized microstructure. Fluxing removes heterogeneous nucleation centers, enabling a higher degree of undercooling. The purified melt is quenched at rates of approximately 100 K/s. The as-quenched alloys are a mixture of metastable Ag-6 at.% Cu and Cu-3.5 at.% Ag solid-solutions and have a eutectic microstructure with approximately 50-nm thick Ag(Cu) and Cu(Ag) lamellae. The alloy's room-temperature compressive yield strength is 370 MPa and its electrical conductivity is 78% of the International Annealed Copper Standard (IACS). These results are evaluated in terms of current understanding on solidification and mechanical properties. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Schwarz, RB (reprint author), Los Alamos Natl Lab, MST-8,MS G755, Los Alamos, NM 87545 USA. NR 25 TC 31 Z9 31 U1 1 U2 8 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 184 THORN HILL RD, WARRENDALE, PA 15086-7514 USA BN 0-87339-558-1 PY 2003 BP 141 EP 147 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA BY41P UT WOS:000189199800018 ER PT S AU Cantoni, C Christen, DK Heatherly, L List, FA Goyal, A Ownby, GW Zehner, DM AF Cantoni, C Christen, DK Heatherly, L List, FA Goyal, A Ownby, GW Zehner, DM BE Goyal, A WongNg, W Murakami, M Driscoll, J TI Control of the sulfur C (2x2) superstructure on (100)(100)-textured metals for rabits applications SO PROCESSING OF HIGH-TEMPERATURE SUPERCONDUCTORS SE CERAMIC TRANSACTIONS LA English DT Proceedings Paper CT Symposium on Processing of High Temperature Superconductors held at the 104th Annual Meeting of the American-Ceramic-Society CY APR 28-MAY 01, 2002 CL ST LOUIS, MO SP Amer Ceram Soc ID COATED CONDUCTORS; SURFACE; NICKEL; ADSORPTION; NI(001); GROWTH; FILMS; LAYER AB We investigate the influence of a chemisorbed S template with centered (2 x 2) structure on the epitaxial growth of commonly used oxide buffer layers on {100}<100> metals for RABiTS fabrication. Our study involves growth of CeO2, Y-stabilized Zr2O3, Gd2O3, LaMnO3 and SrTiO3 seed layers on biaxially textured Ni and Ni-alloys. We also discuss,the effect of an incomplete c (2 X 2) surface coverage on the seed layer texture and the use of H2S in a pre-deposition anneal as a mean to control the superstructure coverage and optimize the seed layer texture. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Cantoni, C (reprint author), Oak Ridge Natl Lab, 1 Bethel Valley Rd, Oak Ridge, TN 37831 USA. RI Cantoni, Claudia/G-3031-2013 OI Cantoni, Claudia/0000-0002-9731-2021 NR 13 TC 0 Z9 0 U1 0 U2 1 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA SN 1042-1122 BN 1-57498-155-2 J9 CERAM TRANS PY 2003 VL 140 BP 17 EP 31 PG 15 WC Thermodynamics; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Thermodynamics; Materials Science; Physics GA BX25E UT WOS:000184739400002 ER PT S AU Ma, B Li, M Fisher, BL Koritala, RE Dorris, SE Maroni, VA Balachandran, U AF Ma, B Li, M Fisher, BL Koritala, RE Dorris, SE Maroni, VA Balachandran, U BE Goyal, A WongNg, W Murakami, M Driscoll, J TI Inclined substrate deposition of magnesium oxide for YBCO-coated conductors SO PROCESSING OF HIGH-TEMPERATURE SUPERCONDUCTORS SE CERAMIC TRANSACTIONS LA English DT Proceedings Paper CT Symposium on Processing of High Temperature Superconductors held at the 104th Annual Meeting of the American-Ceramic-Society CY APR 28-MAY 01, 2002 CL ST LOUIS, MO SP Amer Ceram Soc ID YTTRIA-STABILIZED-ZIRCONIA; THIN-FILMS; BUFFER LAYERS; LASER DEPOSITION; MGO; BICRYSTALS; YBA2CU3O7; TEXTURE; GROWTH; TAPES AB Thin films of YBa2Cu3O7, (YBCO) were grown on MgO buffered metallic substrates by pulsed laser deposition (PLD). The MgO buffer films, which provide the initial biaxial texture, had been grown on polished Hastelloy C276 (HC) tapes using inclined substrate deposition (ISD). The ISD process is promising for the fabrication of coated superconductor wires because it produces biaxially textured template films on nontextured substrate at high deposition rates. Biaxially aligned MgO films were deposited at deposition rates of 20 to 100 Angstrom/sec. The buffer films were deposited on these template films before ablation of the YBCO films by PLD. The microstructure was studied by scanning electron microscopy and atomic force microscopy. X-ray pole figure analysis and phi- and omega-scans were used for texture characterization. Good in- and out-of-plane textures were observed on the ISD MgO films (approximate to1.5 mum thick). The full width at half maximums were 9.2degrees for the MgO (002) phi-scan and 5.4degrees for the omega-scan. Cube-on-cube epitaxial growth of yttria-stabilized zirconia (YSZ) and ceria (CeO2) films on the ISD MgO films was also achieved by PLD. A superconducting critical temperature of 90 K, with a sharp transition, and transport critical current density of >2.5 x 10(5) A/cm(2) were obtained on a 0.5-mum-thick, 0.5-cm-wide, and 1-cm-long YBCO film with MgO buffer layer at 77 K in self-field. C1 Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. RP Ma, B (reprint author), Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. RI Koritala, Rachel/F-1774-2011; Ma, Beihai/I-1674-2013 OI Ma, Beihai/0000-0003-3557-2773 NR 20 TC 0 Z9 0 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA SN 1042-1122 BN 1-57498-155-2 J9 CERAM TRANS PY 2003 VL 140 BP 33 EP 44 PG 12 WC Thermodynamics; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Thermodynamics; Materials Science; Physics GA BX25E UT WOS:000184739400003 ER PT S AU Weber, TP Ma, B Balachandran, U McNallan, M AF Weber, TP Ma, B Balachandran, U McNallan, M BE Goyal, A WongNg, W Murakami, M Driscoll, J TI Ion-beam-assisted deposition of magnesium oxide films for coated conductors SO PROCESSING OF HIGH-TEMPERATURE SUPERCONDUCTORS SE CERAMIC TRANSACTIONS LA English DT Proceedings Paper CT Symposium on Processing of High Temperature Superconductors held at the 104th Annual Meeting of the American-Ceramic-Society CY APR 28-MAY 01, 2002 CL ST LOUIS, MO SP Amer Ceram Soc ID YTTRIA-STABILIZED-ZIRCONIA; MGO AB The development of high critical-temperature thin-film superconductors and coated conducting wires is important for electric power applications. To achieve high transport current density, template films are necessary for the successful deposition of biaxially aligned YBa2Cu3O7-x. (YBCO) on flexible metal substrates. We. grew biaxially aligned magnesium oxide (MgO) template films by ion-beam assisted deposition with electron-beam evaporation. MgO films of approximate to 100 A thickness were deposited on Si3N4-coated Si substrates at a deposition rate of 2 approximate to1.5 Angstrom/see with an ion flux of approximate to110 muA/cm(2) bombarding the substrate at a 45degrees angle. To study crystalline structure by X-ray diffraction, we deposited an additional. layer of MgO. Good in- and out-of-plane alignment was observed, with (111) phi-scan full-width half-maximum (FWHM) of 6.2degrees and (002) omega-scan FWHM of 2.2degrees. C1 Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. RP Weber, TP (reprint author), Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. RI Ma, Beihai/I-1674-2013 OI Ma, Beihai/0000-0003-3557-2773 NR 8 TC 0 Z9 0 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA SN 1042-1122 BN 1-57498-155-2 J9 CERAM TRANS PY 2003 VL 140 BP 45 EP 52 PG 8 WC Thermodynamics; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Thermodynamics; Materials Science; Physics GA BX25E UT WOS:000184739400004 ER PT S AU Li, M Ma, B Koritala, RE Fisher, BL Dorris, SE Venkataraman, K Balachandran, U AF Li, M Ma, B Koritala, RE Fisher, BL Dorris, SE Venkataraman, K Balachandran, U BE Goyal, A WongNg, W Murakami, M Driscoll, J TI Inclined substrate pulsed laser deposition of YBCO thin films on polycrystalline AG substrates SO PROCESSING OF HIGH-TEMPERATURE SUPERCONDUCTORS SE CERAMIC TRANSACTIONS LA English DT Proceedings Paper CT Symposium on Processing of High Temperature Superconductors held at the 104th Annual Meeting of the American-Ceramic-Society CY APR 28-MAY 01, 2002 CL ST LOUIS, MO SP Amer Ceram Soc ID SUPERCONDUCTING TAPES; YBA2CU3O7-X FILMS; BUFFER LAYERS; ALIGNMENT; DENSITY; ALLOY AB Films of YBa2Cu3O7-x (YBCO) with c-axis orientation were directly deposited on nontextured silver substrates by inclined substrate pulsed laser ablation. The structure of the YBCO films was characterized by X-ray diffraction 2theta-scans, Omega-scans, and pole-figure analysis. A good alignment of the c-axis of the YBCO films was confirmed by the Omega-scans, in which the full width at half maximum of the YBCO(005) was 3.8degrees. A sharp interface between the YBCO film and Ag substrate was observed by transmission electron microscopy. The surface morphology of the film, examined by scanning electron microscopy, reflected the recrystallization of the Ag substrate. Raman spectroscopy was used to evaluate the quality of the YBCO films. The superconducting transition temperature (T-c) and the critical current density (J(c)) of the films were determined by inductive and transport measurements, respectively. T-c = 91 K with a sharp transition and J(o) = 2.7 x 10(5)A/cm(2) at 77 K in zero external field were achieved on a film with 0.14-mum thickness. C1 Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. RP Li, M (reprint author), Argonne Natl Lab, Div Energy Technol, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Koritala, Rachel/F-1774-2011; Ma, Beihai/I-1674-2013 OI Ma, Beihai/0000-0003-3557-2773 NR 13 TC 0 Z9 0 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA SN 1042-1122 BN 1-57498-155-2 J9 CERAM TRANS PY 2003 VL 140 BP 137 EP 146 PG 10 WC Thermodynamics; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Thermodynamics; Materials Science; Physics GA BX25E UT WOS:000184739400013 ER PT S AU Berdahl, P Liu, JP Reade, RP Russo, RE AF Berdahl, P Liu, JP Reade, RP Russo, RE BE Goyal, A WongNg, W Murakami, M Driscoll, J TI Ion texturing of amorphous yttria-stabilized zirconia to form a template for YBa2Cu3O7 deposition SO PROCESSING OF HIGH-TEMPERATURE SUPERCONDUCTORS SE CERAMIC TRANSACTIONS LA English DT Proceedings Paper CT Symposium on Processing of High Temperature Superconductors held at the 104th Annual Meeting of the American-Ceramic-Society CY APR 28-MAY 01, 2002 CL ST LOUIS, MO SP Amer Ceram Soc ID BEAM-ASSISTED DEPOSITION; PULSED-LASER DEPOSITION; O THIN-FILMS; BUFFER LAYERS; MGO; YBCO; ALLOYS AB We are investigating a novel technique for texturing of buffer layers, such as yttria-stabilized zirconia (YSZ), that we term ITEX (Ion TEXturing). The goal is to achieve the high-quality texture now routinely produced by oblique IBAD (Ion Beam Assisted Deposition), in a method that is faster, simpler, and less expensive. In the new ITEX method, an amorphous film is synthesized first, and subsequently bombarded with an oblique ion beam, causing the surface region of the film. to crystallize. YBa2Cu3O7 deposition on the YSZ ITEX film yields a highly c-axis oriented superconducting film that also has in-plane orientation (critical current density, 0.25 MA cm(-2)). It is proposed that a future challenge for molecular dynamics computations is to simulate the ITEX process, in which atom or ion bombardment causes fully oriented crystals to form in an amorphous film. C1 Univ Calif Berkeley, EO Lawrence Berkeley natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. RP Berdahl, P (reprint author), Univ Calif Berkeley, EO Lawrence Berkeley natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. RI Liu, Jinping/B-2305-2010 NR 15 TC 0 Z9 0 U1 0 U2 1 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA SN 1042-1122 BN 1-57498-155-2 J9 CERAM TRANS PY 2003 VL 140 BP 203 EP 210 PG 8 WC Thermodynamics; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Thermodynamics; Materials Science; Physics GA BX25E UT WOS:000184739400018 ER PT S AU Cheon, JH Singh, JP AF Cheon, JH Singh, JP BE Goyal, A WongNg, W Murakami, M Driscoll, J TI Residual stress measurement in YBCO thin films SO PROCESSING OF HIGH-TEMPERATURE SUPERCONDUCTORS SE CERAMIC TRANSACTIONS LA English DT Proceedings Paper CT Symposium on Processing of High Temperature Superconductors held at the 104th Annual Meeting of the American-Ceramic-Society CY APR 28-MAY 01, 2002 CL ST LOUIS, MO SP Amer Ceram Soc ID CRITICAL-CURRENT DENSITY; SUPERCONDUCTING TAPES; COATED CONDUCTORS; ANISOTROPY; DEPOSITION AB Residual stress in YBCO films on Ag and Hastelloy C substrates was determined by using 3-D optical interferometry and laser scanning to measure the change in curvature radius before and after film deposition. The residual stress was obtained by appropriate analysis of curvature measurements. Consistent with residual thermal stress calculations based on the thermal expansion coefficient mismatch between the substrates and YBCO film, the measured residual stress in the YBCO film on Hastelloy C substrate was tensile, while it was compressive on the Ag substrate. The stress values measured by the two techniques were generally in good agreement, suggesting that optical interferometry and laser scanning have promise for measuring residual stresses in thin films. C1 Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. RP Cheon, JH (reprint author), Argonne Natl Lab, Div Energy Technol, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 17 TC 1 Z9 1 U1 0 U2 1 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA SN 1042-1122 BN 1-57498-155-2 J9 CERAM TRANS PY 2003 VL 140 BP 219 EP 228 PG 10 WC Thermodynamics; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Thermodynamics; Materials Science; Physics GA BX25E UT WOS:000184739400020 ER PT S AU Paranthaman, MP Sathyamurthy, S Zhai, HY Christen, HM Kang, S Goyal, A AF Paranthaman, MP Sathyamurthy, S Zhai, HY Christen, HM Kang, S Goyal, A BE Goyal, A WongNg, W Murakami, M Driscoll, J TI Demonstration of high current density YBCO films on all solution buffers SO PROCESSING OF HIGH-TEMPERATURE SUPERCONDUCTORS SE CERAMIC TRANSACTIONS LA English DT Proceedings Paper CT Symposium on Processing of High Temperature Superconductors held at the 104th Annual Meeting of the American-Ceramic-Society CY APR 28-MAY 01, 2002 CL ST LOUIS, MO SP Amer Ceram Soc ID COATED-CONDUCTOR FABRICATION; LANTHANUM ZIRCONATE; SOLUTION DEPOSITION AB Chemical solution deposition has been emerged as a viable, low-cost, non-vacuum process for fabricating long lengths of YBa2Cu3O7-delta (YBCO) coated conductors. Single, epitaxial buffer layers of La2Zr2O7 (LZO) have been grown directly on biaxially textured and strengthened Ni-W (3 at.%) substrates by a solution process. Smooth, epitaxial, and crack-free buffer layers with desired thickness were produced using multiple coating. YBCO films grown on 60 nm thick LZO-buffered Ni-W substrates using pulsed laser deposition yielded very high critical current densities of 1.9 MA/cm(2) at 77 K and self-field. These results are comparable to those typically obtained on identical substrates using our standard architecture of CeO2/YSZ/Y2O3/Ni. The dependence of critical current density, J(c) on thick YBCO films grown on 60 nm thick LZO layers is investigated. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Paranthaman, MP (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RI Christen, Hans/H-6551-2013; Paranthaman, Mariappan/N-3866-2015 OI Christen, Hans/0000-0001-8187-7469; Paranthaman, Mariappan/0000-0003-3009-8531 NR 4 TC 0 Z9 0 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA SN 1042-1122 BN 1-57498-155-2 J9 CERAM TRANS PY 2003 VL 140 BP 249 EP 254 PG 6 WC Thermodynamics; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Thermodynamics; Materials Science; Physics GA BX25E UT WOS:000184739400023 ER PT S AU Veal, BW Claus, H Chen, LH Paulikas, AP AF Veal, BW Claus, H Chen, LH Paulikas, AP BE Goyal, A WongNg, W Murakami, M Driscoll, J TI Studies of grain boundaries in melt textured YBa2Cu3Ox SO PROCESSING OF HIGH-TEMPERATURE SUPERCONDUCTORS SE CERAMIC TRANSACTIONS LA English DT Proceedings Paper CT Symposium on Processing of High Temperature Superconductors held at the 104th Annual Meeting of the American-Ceramic-Society CY APR 28-MAY 01, 2002 CL ST LOUIS, MO SP Amer Ceram Soc ID THIN-FILMS; TRANSPORT; BICRYSTALS; DISORDER; CURRENTS; BULK AB [001] tilt grain boundaries were studied in bi-crystal samples of melt textured YBa2Cu3Ox. Grain boundary critical current densities J(CB), were obtained from SQUID magnetization measurements on ring samples that contain the grain boundary. The dependence of J(CB), on oxygen stoichiometry and oxygen ordering were investigated and preliminary studies of grain boundary doping with selected cations, including Ca, Sr, and Bi were undertaken. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Veal, BW (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA SN 1042-1122 BN 1-57498-155-2 J9 CERAM TRANS PY 2003 VL 140 BP 309 EP 323 PG 15 WC Thermodynamics; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Thermodynamics; Materials Science; Physics GA BX25E UT WOS:000184739400028 ER PT J AU Lyczkowski, RW Bouillard, JX AF Lyczkowski, RW Bouillard, JX TI State-of-the-art review of erosion modeling in fluid/solids systems (vol 28, pg 543, 2002) SO PROGRESS IN ENERGY AND COMBUSTION SCIENCE LA English DT Correction C1 Argonne Natl Lab, Div Energy Syst, Argonne, IL 60439 USA. INERIS, Parc Technol ALATA, F-60550 Verneuil En Halatte, France. RP Lyczkowski, RW (reprint author), Argonne Natl Lab, Div Energy Syst, Room C348D,Bldg 362,9700 S Cass Ave, Argonne, IL 60439 USA. EM rlyczkowski@anl.gov NR 3 TC 0 Z9 0 U1 2 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0360-1285 J9 PROG ENERG COMBUST JI Prog. Energy Combust. Sci. PY 2003 VL 29 IS 1 BP 85 EP 85 AR PII S0360-1285(02)00045-X DI 10.1016/S0360-1285(02)00045-X PG 1 WC Thermodynamics; Energy & Fuels; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA 657PE UT WOS:000181674900003 ER PT J AU Lucht, RP Roy, S Reichardt, TA AF Lucht, RP Roy, S Reichardt, TA TI Calculation of radiative transition rates for polarized laser radiation SO PROGRESS IN ENERGY AND COMBUSTION SCIENCE LA English DT Review DE laser diagnostics; laser-induced fluorescence; absorption; emission; polarization spectroscopy; resonant four-wave mixing ID DEGENERATE 4-WAVE-MIXING SPECTROSCOPY; QUANTITATIVE CONCENTRATION MEASUREMENTS; ATMOSPHERIC-PRESSURE FLAMES; ROTATIONAL ENERGY-TRANSFER; PULSED DYE-LASER; A-X SYSTEM; THERMAL-GRATING CONTRIBUTIONS; BROAD-BANDWIDTH LASERS; FRANCK-CONDON FACTORS; INDUCED FLUORESCENCE AB The calculation of laser-induced radiative transition rates for electric-dipole transitions is reviewed. The effects of laser polarization can only be understood by considering the Zeeman structure of energy levels. In particular, the case of laser coupling of degenerate levels is considered by including the Zeeman structure of the upper and lower energy levels. The interaction of the laser radiation with the atomic or molecular resonance is formulated in terms of the density matrix. The electric-dipole matrix elements are written as the product of a scalar quantity, the reduced density matrix element, and a vector quantity that is a function of the angular momentum quantum numbers J and magnetic quantum numbers M for the upper and lower Zeeman states. The calculation of absorption and stimulated emission rates, absorption coefficients, and susceptibilities for the limiting case of an isotropic medium is reviewed. Polarization effects in laser-induced fluorescence are reviewed, and the theoretical framework for the analysis of these effects is developed. The calculation of polarization spectroscopy signals and of polarization effects in resonant four-wave mixing are discussed. The effects of hyperfine structure in diatomic molecules are discussed. (C) 2003 Elsevier Science Ltd. All rights reserved. C1 Purdue Univ, Dept Engn Mech, W Lafayette, IN 47907 USA. Innovat Sci Solut Inc, Dayton, OH 45440 USA. Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA. RP Lucht, RP (reprint author), Purdue Univ, Dept Engn Mech, 1288 Mech Engn Bldg, W Lafayette, IN 47907 USA. EM lucht@ecn.purdue.edu NR 175 TC 4 Z9 4 U1 1 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0360-1285 J9 PROG ENERG COMBUST JI Prog. Energy Combust. Sci. PY 2003 VL 29 IS 2 BP 115 EP 137 AR PII S0360-1285(02)00044-8 DI 10.1016/S0360-1285(02)00044-8 PG 23 WC Thermodynamics; Energy & Fuels; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA 673ZW UT WOS:000182612400002 ER PT J AU Naidja, A Krishna, CR Butcher, T Mahajan, D AF Naidja, A Krishna, CR Butcher, T Mahajan, D TI Cool flame partial oxidation and its role in combustion and reforming of fuels for fuel cell systems SO PROGRESS IN ENERGY AND COMBUSTION SCIENCE LA English DT Review DE cool flame; oxidation; combustion;. kinetics; reforming; fuel cell ID LOW-TEMPERATURE OXIDATION; CATALYTIC PARTIAL OXIDATION; N-HEPTANE OXIDATION; JET-STIRRED REACTOR; NONCATALYTIC PARTIAL OXIDATION; HIGH-PRESSURE OXIDATION; GAS-PHASE OXIDATION; SOUR NATURAL-GAS; DROPLET VAPORIZATION; FAST-PYROLYSIS AB The purpose of this review was to integrate the most recent and relevant investigations on the auto-oxidation of fuel oils and their reforming into hydrogen-rich gas that could serve as a feed for fuel cells and combustion systems. We consider the incorporation of partial oxidation under cool. flame conditions to be a significant step in the reforming process for generation of hydrogen-rich gas. Therefore, we have paid particular attention to the partial oxidation of fuels at low temperature in the cool flame region. This is still not a well-understood feature in the oxidation of fuels and can potentially serve as a precursor to low NOx emissions and low soot formation. Pretreatment, including atomization, vaporization and burner technology are also briefly reviewed. The oxidation of reference fuels (n-heptane C7H16, iso-octane C8H18 and to a lesser extent cetane C16H34) in the intermediate and high temperature ranges have been studied extensively and it is examined here to show the significant progress made in modeling the kinetics and mechanisms, and in the evaluation of ignition delay times. However, due to the complex nature of real fuels such as petroleum distillates (diesel and jet fuel) and biofuels, much less is known on the kinetics and mechanisms of their oxidation, as well as on the resulting reaction products formed during partial oxidation. The rich literature on the oxidation of fuels is, hence, limited to the cited main reference fuels. We have also covered recent developments in the catalytic reforming of fuels. In the presence of catalysts, the fuels can be reformed through partial oxidation, steam reforming and autothermal reforming (ATR) to generate hydrogen. But optimum routes to produce cost effective hydrogen fuel from conventional or derivative fuels are still debatable. It is suggested that the use of products emanating from partial oxidation of fuels under cool flame conditions could be attractive in such reforming processes, but this is as yet untested. The exploitation of developments in oxidation, combustion and reforming processes is always impacted by the resulting emission of pollutants, including NOx, SOx, CO and soot, which have an impact on the health of the fragile ecosystem. Attention is paid to the progress made in innovative techniques developed to reduce the level of pollutants resulting from oxidation and reforming processes. In the last part, we summarize the present status-of the topics covered and present prospects for future research. This information forms the basis for recommended themes that are vital in developing the next generation energy-efficient combustion and,fuel cell technologies. (C) 2003 Elsevier Science Ltd. All rights reserved. C1 Brookhaven Natl Lab, Energy Sci & Technol Dept, Upton, NY 11973 USA. RP Mahajan, D (reprint author), Brookhaven Natl Lab, Energy Sci & Technol Dept, Bldg 815, Upton, NY 11973 USA. NR 192 TC 61 Z9 62 U1 5 U2 41 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0360-1285 J9 PROG ENERG COMBUST JI Prog. Energy Combust. Sci. PY 2003 VL 29 IS 2 BP 155 EP 191 DI 10.1016/S0360-1285(03)00018-2 PG 37 WC Thermodynamics; Energy & Fuels; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA 673ZW UT WOS:000182612400004 ER PT S AU Ma, L Lam, PW Kokaly, MT Jackson, JH Kobayashi, AS AF Ma, L Lam, PW Kokaly, MT Jackson, JH Kobayashi, AS BE Geni, M Kikuchi, M TI CTOA of aluminum fracture specimen SO PROGRESS IN EXPERIMENTAL AND COMPUTATIONAL MECHANICS IN ENGINEERING SE Key Engineering Materials LA English DT Article; Proceedings Paper CT International Conference on Experimental and Computational Mechanics in Engineering CY AUG 24-27, 2002 CL DUNHUANG, PEOPLES R CHINA SP Xinjiang Univ, Tokyo Univ Sci, Lanzhou Univ, Shaanxi Soc Theoret & Appl Mech DE CTOA; stable crack growth; dynamic crack growth; 3-D crack growth moire inteferometry; finite element analysis AB A CTOA resistance curve was generated from the moire interferometry data of thin SEN and MT, 2024-T3 aluminum fracture specimens. This CTOA resistance curve, which has a steady state value of 6degrees, was used to propagate the cracks in elastic-plastic FE models of the NIT specimen without and with a simulated multiple site damage (MSD). The CTOA of curved crack growth in a biaxial SEN specimen scattered between 4degrees to 8degrees. However, the resultant CTOD, which is the vector sum of the crack-tip opening and sliding displacements, remained a constant 0.18 mm. The CTOA of a rapidly propagating crack in 1.6-mm thick, 7075-T6 SEN specimens increased from 4.5degrees at a low crack velocity to a constant 7degrees at the terminal crack velocity. A hybrid moire-FE analysis was used to determine the CTOA of a tunneling crack in a thick SEN bend (SENB) specimen. C1 United Technol Res Ctr, Struct Integ Grp, E Hartford, CT 06108 USA. NASA, Ames Res Ctr, Orbital Sci Corp, Moffett Field, CA 94035 USA. Fatigue Technol Inc, Seattle, WA 98188 USA. Idaho Natl Engn & Environm Labs, Idaho Falls, ID 83415 USA. Univ Washington, Dept Mech Engn, Seattle, WA 98195 USA. RP United Technol Res Ctr, Struct Integ Grp, E Hartford, CT 06108 USA. NR 18 TC 0 Z9 0 U1 0 U2 3 PU TRANS TECH PUBLICATIONS LTD PI DURNTEN-ZURICH PA KREUZSTRASSE 10, 8635 DURNTEN-ZURICH, SWITZERLAND SN 1013-9826 BN 0-87849-913-X J9 KEY ENG MATER PY 2003 VL 243-2 BP 261 EP 266 PG 6 WC Materials Science, Ceramics; Mechanics; Materials Science, Composites SC Materials Science; Mechanics GA BW88H UT WOS:000183458800044 ER PT J AU Haghighat, A Wagner, JC AF Haghighat, A Wagner, JC TI Monte Carlo variance reduction with deterministic importance functions SO PROGRESS IN NUCLEAR ENERGY LA English DT Article DE Monte Carlo; variance reduction; radiation transport; adjoint transport ID IMPORTANCE BIASING SCHEME; TRANSPORT; NEUTRON; CODE; MCNP; DSA AB Recent trends in Monte Carlo code development have reflected a recognition of the benefits of using deterministic importance functions for Monte Carlo variance reduction. This paper offers a review of the use of deterministic importance functions for variance reduction of Monte Carlo simulations. Adjoint methodology and the concept of "importance" are presented, along with an explanation of their use for variance reduction. Relevant works from a number of different researchers are briefly reviewed. The authors' CADIS methodology for calculating consistent source biasing and weight window parameters based on deterministic importance functions is presented. Efforts to automate the generation and use of deterministic importance functions are briefly described, including an overview of the A (MCNP)-M-3 code. Finally, aspects of interest, including computational benefits, associated with using deterministic importance functions for Monte Carlo simulation of real-world problems are demonstrated. (C) 2003 Elsevier Science Ltd. All rights reserved. C1 Penn State Univ, Mech & Nucl Engn Dept, University Pk, PA 16802 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Haghighat, A (reprint author), Univ Florida, Nucl & Radiol Engn Dept, 202 Nucl Sci Bldg,POB 118300, Gainesville, FL 32611 USA. RI Wagner, John/K-3644-2015 OI Wagner, John/0000-0003-0257-4502 NR 67 TC 49 Z9 50 U1 3 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0149-1970 J9 PROG NUCL ENERG JI Prog. Nucl. Energy PY 2003 VL 42 IS 1 BP 25 EP 53 AR PII S0149-1970(02)00002-1 DI 10.1016/S0149-1970(02)00002-1 PG 29 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 630JY UT WOS:000180104800003 ER PT J AU Sood, A Forster, RA Parsons, DK AF Sood, A Forster, RA Parsons, DK TI Analytical benchmark test set for criticality code verification SO PROGRESS IN NUCLEAR ENERGY LA English DT Article DE analytic; benchmark; criticality; code verification ID SPEED NEUTRON-TRANSPORT; EIGENVALUES; SPHERES; SLABS AB A number of published numerical solutions to analytic eigenvalue (k(eff)) and. eigen-function equations are summarized for the purpose of creating a criticality verification benchmark test set. The 75-problem test set allows the user to verify the correctness of a criticality code for infinite medium and simple geometries in one-, two-, three-, and six-energy groups, with one-, two-, and four-media. The problems include both isotropic and linearly and quadratically anisotropic neutron scattering. The problem specifications will produce both k(eff)=1 and the quoted k(infinity), to at least five decimal places. MCNP (Briesmeister, 1997) and DANTSYS (Alcouff, R.E, et al., 1995) have been verified using these problems. Additional uses of the test set for code verification are also discussed. C1 Los Alamos Natl Lab, Appl Phys X Div, X5 Diagnost Applicat Grp, Los Alamos, NM 87545 USA. RP Sood, A (reprint author), Los Alamos Natl Lab, Appl Phys X Div, X5 Diagnost Applicat Grp, POB 1663,MS F663, Los Alamos, NM 87545 USA. NR 55 TC 29 Z9 29 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0149-1970 J9 PROG NUCL ENERG JI Prog. Nucl. Energy PY 2003 VL 42 IS 1 BP 55 EP 106 AR PII S0149-1970(02)00098-7 DI 10.1016/S0149-1970(02)00098-7 PG 52 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 630JY UT WOS:000180104800004 ER PT J AU Demuth, SF AF Demuth, SF TI SP100 space reactor design SO PROGRESS IN NUCLEAR ENERGY LA English DT Article DE SP100; space; nuclear; reactor; NASA AB The SP100 space nuclear reactor was designed for use as an orbital power supply, lunar or Martian surface power station, and power supply for nuclear electric propulsion, with a scaleable power range of 10's kWe to 100's kWe. The original mission was an orbital power supply for the United State's (U.S.) Strategic Defense Initiative (SDI) of the 1980s. Although the original sponsors were a consortium of the U.S. Department of Defense, U.S. Department of Energy, and the U.S. National Aeronautics and Space Administration (NASA), as the SDI effort diminished with the demise of the Soviet Union the mission evolved more toward the needs of NASA. Eventually, as the grandiose missions of NASA came into question in the early 1990s and less extravagant missions became more palatable, the SP100 program was discontinued. At the time of program discontinuation a complex infrastructure of industry and national laboratories had been established, and approximately $1-billion invested in design and development. The SP100 was not intended as a low cost one-time-use device; but rather, a highly flexible power supply that realized a cost advantage by being capable of multiple missions, based on a common design with the flexibility to evolve. The design and development team made major progress successfully fabricating and testing technology features that were essential to meeting the stringent safety, performance, lifetime and reliability requirements of proposed missions. The following paper attempts to describe the high level of sophistication incorporated in the SP100 design, and the high degree of technology readiness at the time of program discontinuation. Published by Elsevier Ltd. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Demuth, SF (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 25 TC 10 Z9 10 U1 2 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0149-1970 J9 PROG NUCL ENERG JI Prog. Nucl. Energy PY 2003 VL 42 IS 3 BP 323 EP 359 DI 10.1016/S0149-1970(03)00074-X PG 37 WC Nuclear Science & Technology SC Nuclear Science & Technology GA 732JF UT WOS:000185939100004 ER PT J AU Blackshear, PJ Phillips, RS Vazquez-Matias, J Mohrenweiser, H AF Blackshear, PJ Phillips, RS Vazquez-Matias, J Mohrenweiser, H TI Polymorphisms in the genes encoding members of the tristetraprolin family of human tandem CCCH zinc finger proteins SO PROGRESS IN NUCLEIC ACID RESEARCH AND MOLECULAR BIOLOGY, VOL 75 SE PROGRESS IN NUCLEIC ACID RESEARCH AND MOLECULAR BIOLOGY LA English DT Review ID ENVIRONMENTAL GENOME PROJECT; EARLY RESPONSE GENE; AU-RICH ELEMENTS; MESSENGER-RNA; TNF-ALPHA; SEQUENCE; CELLS; DEFICIENCY; RECEPTOR; DESTABILIZATION C1 NIEHS, Off Clin Res, Res Triangle Pk, NC 27709 USA. NIEHS, Lab Signal Transduct, Res Triangle Pk, NC 27709 USA. Duke Univ, Med Ctr, Dept Med & Biochem, Durham, NC 27710 USA. Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA 94551 USA. RP Blackshear, PJ (reprint author), NIEHS, Off Clin Res, A2-05 111 Alexander Dr, Res Triangle Pk, NC 27709 USA. FU NIEHS NIH HHS [ES-8054-05] NR 33 TC 16 Z9 17 U1 3 U2 5 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 USA SN 0079-6603 J9 PROG NUCLEIC ACID RE PY 2003 VL 75 BP 43 EP 68 DI 10.1016/S0079-6603(03)75002-8 PG 26 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA BX76W UT WOS:000186348700002 PM 14604009 ER PT S AU Carena, M Haber, HE AF Carena, M Haber, HE BE Faessler, A TI Higgs boson theory and phenomenology SO PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, VOL 50, NO 1 SE Progress in Particle and Nuclear Physics LA English DT Article ID SUPERSYMMETRIC STANDARD MODEL; EXPLICIT CP VIOLATION; ELECTROWEAK SYMMETRY-BREAKING; E(+)E(-) LINEAR COLLIDERS; HADRONIC DECAY WIDTH; TOP-QUARK DECAY; GRAND UNIFIED THEORIES; MASS SUM-RULES; RENORMALIZATION-GROUP ANALYSIS; FEYNMAN-DIAGRAMMATIC APPROACH AB Precision electroweak data presently favors a weakly-coupled Higgs sector as the mechanism responsible for electroweak symmetry breaking. Low-energy supersymmetry provides a natural framework for weakly-coupled elementary scalars. In this review, we summarize the theoretical properties of the Standard Model (SM) Higgs boson and the Higgs sector of the minimal supersymmetric extension of the Standard Model (MSSM). We then survey the phenomenology of the SM and MSSM Higgs bosons at the Tevatron, LHC and a future e(+)e(-) linear collider. We focus on the Higgs discovery potential of present and future colliders and stress the importance of precision measurements of Higgs boson properties. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA. RP Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 443 TC 318 Z9 318 U1 3 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0146-6410 J9 PROG PART NUCL PHYS PY 2003 VL 50 IS 1 BP 63 EP 152 AR PII S0146-6410(02)00177-1 DI 10.1016/S0146-6410(02)00177-1 PG 90 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BW78Y UT WOS:000183165300002 ER PT S AU Helbing, K AF Helbing, K CA GDH-Collaboration BE Faessler, A TI Experimental verification of the GDH sum rule SO PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, VOL 50, NO 2: QUARKS IN HADRONS AND NUCLEI SE PROGRESS IN PARTICLE AND NUCLEAR PHYSICS LA English DT Article; Proceedings Paper CT International School of Nuclear Physics CY SEP 16-24, 2002 CL ERICE, ITALY ID POLARIZED ELECTRONS; CROSS-SECTIONS; PROTON; DETECTOR; SPIN; PHOTOABSORPTION; DEPENDENCE; TRACKING; ELSA; H-1 AB Sum rules involving the spin structure of the nucleon like those due to Bjorken, Ellis and Jaffe and the one due to Gerasimov, Drell and Hearn offer the opportunity to study the structure of strong interactions. At long distance scales in the confinement regime the Gerasimov-Drell-Hearn (GDH) Sum Rule connects static properties of the nucleon like the anomalous magnetic moment K and the nucleon mass M, with the spin dependent absorption of real photons with total cross sections sigma(3/2) and sigma(1/2): integral(0)(infinity) dv/v(sigma(3/2)(v) - sigma(1/2)(v)) = 2pi(2)alpha/m(2 .) kappa(2) Here 3/2 and 1/2 identify relative spin orientation of the photon and the nucleon parallel or anti-parallel respectively in the nucleon rest frame; a denotes the fine-structure constant and v the energy of the photon. Hence the full spin-dependent excitation spectrum of the nucleon is related to its static properties. The sum rule has not been investigated experimentally until recently. For the first time this fundamental sum rule is verified by the GDH-Collaboration with circularly polarized real photons and longitudinally polarized nucleons at the two accelerators ELSA and MAMI. The investigation of the response of the proton as well as of the neutron allows to perform an isospin decomposition. Data from the resonance region up to the onset of the Regge regime are shown. The "sum" on the left hand side of the GDH Sum Rule can be generalized to the case of virtual photons. This allows to establish a Q(2) dependency and to study the transition to the perturbative regime of QCD. This is the subject of several experiments e.g. at JLAB for the resonance region and of the HERMES experiment at DESY for higher Q(2). Moreover, this paper covers the status of theory concerning the GDH Sum Rule, the different experimental approaches and the results for the absorption of real and virtual photons will be reviewed. C1 Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany. RP Helbing, K (reprint author), LBNL, Berkeley, CA 94720 USA. NR 50 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0146-6410 J9 PROG PART NUCL PHYS PY 2003 VL 50 IS 2 BP 451 EP 462 AR PII S0146-6410(03)00039-5 DI 10.1016/S0146-6410(03)00039-5 PG 12 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BW78X UT WOS:000183163100024 ER PT S AU Greensite, J AF Greensite, J BE Faessler, A TI The confinement problem in lattice gauge theory SO PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, VOL 51, NO 1 SE Progress in Particle and Nuclear Physics LA English DT Article ID YANG-MILLS-THEORY; CENTER VORTEX MODEL; INFINITE-MOMENTUM FRAME; ADJOINT STRING TENSION; FIXED-POINT ACTION; T-HOOFT LOOP; CENTER VORTICES; QUARK CONFINEMENT; MONTE-CARLO; ABELIAN DOMINANCE AB I review investigations of the quark confinement mechanism that have been carried out in the framework of SU(N) lattice gauge theory. The special role of Z(N) center symmetry is emphasized. C1 San Francisco State Univ, Dept Phys & Astron, San Francisco, CA 94132 USA. Lawrence Berkeley Natl Lab, Theory Grp, Berkeley, CA 94720 USA. RP Greensite, J (reprint author), San Francisco State Univ, Dept Phys & Astron, San Francisco, CA 94132 USA. NR 212 TC 291 Z9 294 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0146-6410 J9 PROG PART NUCL PHYS PY 2003 VL 51 IS 1 BP 1 EP 83 DI 10.1016/S0146-6410(03)00079-6 PG 83 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BX24K UT WOS:000184721500001 ER PT J AU Green, MA Emery, K King, DL Igari, S Warta, W AF Green, MA Emery, K King, DL Igari, S Warta, W TI Solar cell efficiency tables (Version 21) SO PROGRESS IN PHOTOVOLTAICS LA English DT Article AB Consolidated tables showing an extensive listing of the highest independently confirmed efficiencies for solar cells and modules are presented. Guidelines for inclusion of results into these tables are outlined and new entries since July, 2002 are reviewed. Copyright (C) 2003 John Wiley Sons, Ltd. C1 Univ New S Wales, Ctr Photovolta Engn, Sydney, NSW 2052, Australia. Natl Renewable Energy Lab, Golden, CO 80401 USA. Sandia Natl Labs, Albuquerque, NM 87123 USA. Natl Inst Adv Ind Sci & Technol, AIST, Energy Elect Inst, Tsukuba, Ibaraki, Japan. Fraunhofer Inst Solar Energy Syst, Dept Solar Cells Mat & Technol, D-79110 Freiburg, Germany. RP Green, MA (reprint author), Univ New S Wales, Ctr Photovolta Engn, Sydney, NSW 2052, Australia. EM m.green@unsw.edu.au NR 41 TC 28 Z9 29 U1 3 U2 18 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 1062-7995 J9 PROG PHOTOVOLTAICS JI Prog. Photovoltaics PD JAN PY 2003 VL 11 IS 1 BP 39 EP 45 DI 10.1002/pip.478 PG 7 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA 637WC UT WOS:000180535900005 ER PT J AU Liu, TB Burger, C Chu, B AF Liu, TB Burger, C Chu, B TI Nanofabrication in polymer matrices SO PROGRESS IN POLYMER SCIENCE LA English DT Review DE nanofabrication; nanostructures; templating; self-assembly; block co-polymers; polymer solutions ID MESOPOROUS MOLECULAR-SIEVES; HYDROPHILIC BLOCK-COPOLYMERS; POLY(2-CINNAMOYLETHYL METHACRYLATE)-BLOCK-POLY(ACRYLIC ACID); LYOTROPIC LIQUID-CRYSTALLINE; COIL DIBLOCK COPOLYMERS; TRIBLOCK COPOLYMER; TEMPLATE-SYNTHESIS; LATEX-PARTICLES; HOLLOW SPHERES; GAMMA-IRRADIATION AB Polymeric systems have played important roles as templates for nanofabrication since they can offer nanotemplates with different morphologies and tunable sizes, can be easily removed after reactions, and can be further modified with different functional groups to enhance the interactions. This review covers recent advances in polymer-assisted fabrication of nanomaterials with emphasis on ordered polymeric nanostructures. Examples could include self-assembled amphiphilic block co-polymers/surfactants, cross-linkable polymers, dendrimers, microemulsions, latex particles, biomacromolecules, electric- or shear-induced structures as templates to fabricate inorganic, organic/inorganic composites and polymeric materials with nanoscale modifications. The phase behavior of block co-polymers in water and the use of templates to form ordered nanostructures are reviewed in detail. Modem physical techniques for nanoscale characterization are briefly discussed. 0 2002 Elsevier Science Ltd. All rights reserved. C1 SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Chu, B (reprint author), SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA. RI Liu, Tianbo/D-8915-2017 OI Liu, Tianbo/0000-0002-8181-1790 NR 174 TC 159 Z9 161 U1 6 U2 93 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0079-6700 J9 PROG POLYM SCI JI Prog. Polym. Sci. PD JAN PY 2003 VL 28 IS 1 BP 5 EP 26 AR PII S0079-6700(02)00077-1 DI 10.1016/S0079-6700(02)00077-1 PG 22 WC Polymer Science SC Polymer Science GA 626TW UT WOS:000179890200002 ER PT S AU Kucheyev, SO Jadadish, C Williams, JS Deenapanray, PNK Yano, M Koike, K Sasa, S Inoue, M Ogata, K AF Kucheyev, SO Jadadish, C Williams, JS Deenapanray, PNK Yano, M Koike, K Sasa, S Inoue, M Ogata, K BE Weaver, BD Manasreh, OM Jagadish, C Zollner, S TI Implant isolation of ZnO epitaxial layers SO PROGRESS IN SEMICONDUCTORS II- ELECTRONIC AND OPTOELECTRONIC APPLICATIONS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Progress in Semiconductors II - Electronic and Optoelectronic Applications CY DEC 02-05, 2002 CL BOSTON, MA SP AF Off Sci Res, AF Res Lab Space Sensing & Vehicle Control Branch ID IRRADIATION TEMPERATURE; ELECTRICAL ISOLATION; GAN; BOMBARDMENT AB The formation of highly resistive films of single-crystal ZnO as a result of irradiation with MeV Li, O, and Si ions is demonstrated. Results show that the ion doses necessary for electrical isolation close-to-inversely depend on the number of ion-beam-generated atomic displacements. Results show that an increase in the dose of 2 MeV 0 ions (up to similar to2 orders of magnitude above the threshold isolation dose) and irradiation temperature (up to 350 degreesC) has a relatively minor effect on the thermal stability of electrical isolation, which is limited to temperatures of similar to 300 - 400 degreesC. For the case of multiple-energy implantation with keV Cr, Fe, or Ni ions, the evolution of sheet resistance with annealing temperature is consistent with defect-induced isolation, with a relatively minor effect of Cr, Fe, or Ni impurities on the thermal stability of isolation. Based on these results, the mechanism for electrical isolation in ZnO by ion bombardment is discussed. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Kucheyev, SO (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-681-8 J9 MATER RES SOC SYMP P PY 2003 VL 744 BP 99 EP 104 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA BW75R UT WOS:000183071200015 ER PT S AU Waldrip, KE Jones, ED Modine, NA Jalali, F Klem, JF Peake, GM AF Waldrip, KE Jones, ED Modine, NA Jalali, F Klem, JF Peake, GM BE Weaver, BD Manasreh, OM Jagadish, C Zollner, S TI Low temperature photoluminescence studies of narrow bandgap GaAsSbN quantum wells on GaAs SO PROGRESS IN SEMICONDUCTORS II- ELECTRONIC AND OPTOELECTRONIC APPLICATIONS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Progress in Semiconductors II - Electronic and Optoelectronic Applications CY DEC 02-05, 2002 CL BOSTON, MA SP AF Off Sci Res, AF Res Lab Space Sensing & Vehicle Control Branch ID TOTAL-ENERGY CALCULATIONS; WAVE BASIS-SET; MOLECULAR-DYNAMICS; ALLOYS; METALS AB We present low-temperature (T = 4K) photoluminescence studies of the effect of adding nitrogen to 6-nm-wide single-strained GaAsSb quantum wells on GaAs. The samples were grown by both MBE and MOCVD techniques. The nominal Sb concentration is about 30%. Adding about 1 to 2% N drastically reduced the bandgap energies from 1 to 0.75 eV, or 1.20 to 1.64 mum. Upon performing ex situ rapid thermal anneals, 825degreesC for 10s, the band gap energies as well as the photoluminescence intensities increased. The intensities increased by an order of magnitude for the annealed samples and the band gap energies increased by about 50 - 100 meV, depending on growth temperatures. The photoluminescence linewidths tended to decrease upon annealing. Preliminary results of a first-principles band structure calculation for the GaAsSbN system are also presented. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Waldrip, KE (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 11 TC 0 Z9 0 U1 1 U2 1 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-681-8 J9 MATER RES SOC SYMP P PY 2003 VL 744 BP 637 EP 645 PG 9 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA BW75R UT WOS:000183071200095 ER PT J AU Hirano, T Nara, Y AF Hirano, T Nara, Y TI Dynamical parton energy loss in relativistic heavy ion collisions SO PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT LA English DT Article; Proceedings Paper CT Tokyo/Adelaide Joint Workshop on Quarks, Astrophysics and Space Physics CY 2003 CL UNIV TOKYO, SCH SCI, TOKYO, JAPAN SP Univ Adelaide, Inst Cosm Ray Res, Inst Space & Astronaut Sci HO UNIV TOKYO, SCH SCI ID P(T) AZIMUTHAL ASYMMETRY; QUARK-GLUON PLASMAS; QCD; RADIATION; EXPANSION; OPACITY; PROBE; JETS AB We investigate the suppression factor and the azimuthal correlation function for high PT hadrons in central Au+Au collisions at roots(NN) = 200 GeV by using a dynamical model in which hydrodynamics is combined with explicitly traversing jets. We study the effects of parton energy loss in a hot medium, intrinsic k(T) of partons in a nucleus, and p(perpendicular to) broadening of jets on the back-to-back correlations of high p(T) hadrons. All these effects are found to be responsible for the disappearance of the away-side peaks in correlation functions. C1 Univ Tokyo, Dept Phys, Tokyo 1130033, Japan. Brookhaven Natl Lab, RIKEN, BNL Res Ctr, Upton, NY 11973 USA. Univ Arizona, Dept Phys, Tucson, AZ 85721 USA. RP Univ Tokyo, Dept Phys, Tokyo 1130033, Japan. NR 25 TC 1 Z9 1 U1 0 U2 1 PU PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE PI KYOTO PA C/O KYOTO UNIV, YUKAWA HALL, KYOTO, 606-8502, JAPAN SN 0375-9687 J9 PROG THEOR PHYS SUPP JI Prog. Theor. Phys. Suppl. PY 2003 IS 151 BP 133 EP 137 PG 5 GA 735NN UT WOS:000186121600016 ER PT J AU Leinweber, DB Hedditch, JN Melnitchouk, W Williams, AG Zanotti, JM AF Leinweber, DB Hedditch, JN Melnitchouk, W Williams, AG Zanotti, JM TI Nucleon resonances from FLIC fermions SO PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT LA English DT Article; Proceedings Paper CT Tokyo/Adelaide Joint Workshop on Quarks, Astrophysics and Space Physics CY 2003 CL UNIV TOKYO, SCH SCI, TOKYO, JAPAN SP Univ Adelaide, Inst Cosm Ray Res, Inst Space & Astronaut Sci HO UNIV TOKYO, SCH SCI ID BARYON RESONANCES; WILSON FERMIONS; CONTINUUM-LIMIT; MASSES; HADRON; QCD AB The Fat Link Irrelevant Clover (FLIC) fermion action and its associated phenomenology are described. The scaling analysis indicates FLIC fermions provide a new form of non-perturbative O(a) improvement where near-continuum results are obtained at finite lattice spacing. Spin-1/2 and spin-3/2, even and odd parity nucleon resonances are investigated. C1 Univ Adelaide, Ctr Subatom Struct Matter, Adelaide, SA 5005, Australia. Univ Adelaide, Dept Phys & Math Phys, Adelaide, SA 5005, Australia. Jefferson Lab, Newport News, VA 23606 USA. RP Leinweber, DB (reprint author), Univ Adelaide, Ctr Subatom Struct Matter, Adelaide, SA 5005, Australia. RI Zanotti, James/H-8128-2012; Williams, Anthony/I-6698-2012; Leinweber, Derek/J-6705-2013; OI Zanotti, James/0000-0002-3936-1597; Leinweber, Derek/0000-0002-4745-6027; Williams, Anthony/0000-0002-1472-1592 NR 18 TC 0 Z9 0 U1 0 U2 0 PU PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE PI KYOTO PA C/O KYOTO UNIV, YUKAWA HALL, KYOTO, 606-8502, JAPAN SN 0375-9687 J9 PROG THEOR PHYS SUPP JI Prog. Theor. Phys. Suppl. PY 2003 IS 151 BP 138 EP 142 PG 5 GA 735NN UT WOS:000186121600017 ER PT J AU Kishimoto, T Hayakawa, T Ajimura, S Minami, S Sakaguchi, A Shimizu, Y Chrien, RE May, M Pile, P Rusek, A Sutter, R Noumi, H Tamura, H Ukai, M Miura, Y Tanida, K AF Kishimoto, T Hayakawa, T Ajimura, S Minami, S Sakaguchi, A Shimizu, Y Chrien, RE May, M Pile, P Rusek, A Sutter, R Noumi, H Tamura, H Ukai, M Miura, Y Tanida, K TI Kaonic nuclei excited by the in-flight (K-, N) reaction SO PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT LA English DT Article; Proceedings Paper CT Workshop on Chiral Restoration in Nuclear Medium CY OCT 07-09, 2002 CL YUKAWA INST THEORET PHYS, KYOTO, JAPAN SP Res Ctr Nucl Phys HO YUKAWA INST THEORET PHYS ID HEAVY-ION COLLISIONS; NEUTRON-STARS; ANTIKAON PRODUCTION; MAXIMUM MASS; MATTER; CONDENSATION AB The first result of the production of kaonic nuclei by the (K-,n) reaction is presented. The spectra strongly indicate that the antikaon nuclear potential is strongly attractive which seem to contradict to many theoretical predictions. It suggests that the so-called kaon condensation is taking place in the core of neutron stars. C1 Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan. Brookhaven Natl Lab, BNL, Upton, NY 11973 USA. KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan. Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan. RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan. RP Kishimoto, T (reprint author), Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan. NR 28 TC 18 Z9 18 U1 0 U2 0 PU PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE PI KYOTO PA C/O KYOTO UNIV, YUKAWA HALL, KYOTO, 606-8502, JAPAN SN 0375-9687 J9 PROG THEOR PHYS SUPP JI Prog. Theor. Phys. Suppl. PY 2003 IS 149 BP 264 EP 274 PG 11 GA 711UR UT WOS:000184759900029 ER PT J AU Dembowski, C Dietz, B Graf, HD Heine, A Papenbrock, T Richter, A Richter, C AF Dembowski, C Dietz, B Graf, HD Heine, A Papenbrock, T Richter, A Richter, C TI Experimental test of the trace formula by Balian and Duplantier SO PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT LA English DT Article; Proceedings Paper CT 5th International Summer School and Conference on Lets Face Chaos through Nonlinear Dynamics CY JUN 30-JUL 14, 2002 CL MARIBOR, SLOVENIA ID STADIUM BILLIARD; SPECTRAL STATISTICS; CHAOTIC DYNAMICS; SYSTEMS; RESONANCES AB Trace formulas provide a direct relation between the eigenvalues of a given quantum system and the properties of the periodic orbits of its classical counterpart. About 25 years ago, Balian and Duplantier derived a trace formula for the resonance density of three-dimensional chaotic microwave cavities. We will present the first experimental test of this semiclassical approximation performed with a microwave cavity of the shape of a three-dimensional Bunimovich billiard. C1 Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RP Dembowski, C (reprint author), Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany. RI Dietz, Barbara/B-4804-2014; OI Dietz, Barbara/0000-0002-8251-6531; Heine, Andreas/0000-0001-9184-867X NR 23 TC 0 Z9 0 U1 1 U2 2 PU PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE PI KYOTO PA C/O KYOTO UNIV, YUKAWA HALL, KYOTO, 606-8502, JAPAN SN 0375-9687 J9 PROG THEOR PHYS SUPP JI Prog. Theor. Phys. Suppl. PY 2003 IS 150 BP 338 EP 342 PG 5 GA 730WQ UT WOS:000185853500032 ER PT S AU Hereld, M Judson, IR Stevens, R AF Hereld, M Judson, IR Stevens, R BE Wu, MH TI DottyToto: A measurement engine for aligning multi-projector display systems SO PROJECTION DISPLAYS IX SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Projection Displays IX CY JAN 22-23, 2003 CL SANTA CLARA, CA SP Soc Imaging Sci & Technol, SPIE DE multi-projector displays; tiled displays; calibration; alignment; projector arrays. AB Tiled displays systems built by combining the images from arrays of projectors can provide huge numbers of pixel elements to applications needing to visually represent lots of information. Such applications are already coming into wide usage and include large scientific visualizations, collaborative virtual environments, and rich multimedia spaces. It is, however, difficult to create the illusion of a unified seamless display for a variety of reasons including optical distortion of the individual projector images due to imperfections in the lenses and basic alignment of the projectors. In this paper we describe an efficient and optimized measurement process using inexpensive components that is tolerant of a wide range of imperfections in components and measurement setup (lighting conditions, camera optics, etc.). Our method nonetheless is capable of accurate and detailed measurement of the layout of all projector images, including the generation of a detailed model of the distortions in each projector optical system. It performs these measurements on the entire array of projectors at once. Once the detailed mapping between projector pixels and mural pixels is measured, the resulting relations can be used in any of a number of ways to improve the appearance of images projected on the display. C1 Argonne Natl Lab, Computat Inst, Argonne, IL 60439 USA. RP Hereld, M (reprint author), Argonne Natl Lab, Computat Inst, Argonne, IL 60439 USA. OI Hereld, Mark/0000-0002-0268-2880 NR 12 TC 1 Z9 1 U1 0 U2 1 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-4802-8 J9 P SOC PHOTO-OPT INS PY 2003 VL 5002 BP 73 EP 86 DI 10.1117/12.473845 PG 14 WC Optics; Imaging Science & Photographic Technology SC Optics; Imaging Science & Photographic Technology GA BW64Y UT WOS:000182690700009 ER PT B AU Stormberg, AI Perry, S Lucid, M Cook, JA AF Stormberg, AI Perry, S Lucid, M Cook, JA GP IAEA TI Use of genetic markers for ecological risk assessment at the Idaho National Engineering and Environmental Laboratory: Microsatellite mutation rate of burrowing mammals - Genetic markers for ecorisk assessment SO PROTECTION OF THE ENVIRONMENT FROM IONISING RADIATION: THE DEVELOPMENT AND APPLICATION OF A SYSTEM OF RADIATION PROTECTION FOR THE ENVIRONMENT SE INTERNATIONAL ATOMIC ENERGY AGENCY CONFERENCE & SYMPOSIUM PAPERS LA English DT Proceedings Paper CT 3rd International Symposium on the Protection of the Environment from Ionising Radiation (SPEIR 3) CY JUL 22-26, 2002 CL Darwin, AUSTRALIA SP Environm Australia, Supervising Scientist Div, Australian Radiat Protect & Nucl Safety Agcy, Int Atom Energy Agcy C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID USA. RP Stormberg, AI (reprint author), Idaho Natl Engn & Environm Lab, Idaho Falls, ID USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA BN 92-0-103603-5 J9 IAEA CONF SYMP PAP PY 2003 VL 17 BP 59 EP 59 PG 1 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA BBN35 UT WOS:000226277800008 ER PT B AU Wilson, MD Hinton, TG AF Wilson, MD Hinton, TG GP IAEA TI Statistics of extreme values - comparative bias associated with various estimates of dose to the maximally exposed individual SO PROTECTION OF THE ENVIRONMENT FROM IONISING RADIATION: THE DEVELOPMENT AND APPLICATION OF A SYSTEM OF RADIATION PROTECTION FOR THE ENVIRONMENT SE INTERNATIONAL ATOMIC ENERGY AGENCY CONFERENCE & SYMPOSIUM PAPERS LA English DT Proceedings Paper CT 3rd International Symposium on the Protection of the Environment from Ionising Radiation (SPEIR 3) CY JUL 22-26, 2002 CL Darwin, AUSTRALIA SP Environm Australia, Supervising Scientist Div, Australian Radiat Protect & Nucl Safety Agcy, Int Atom Energy Agcy AB Protection of the environment from anthropogenic radiation is an on-going international concern. The paradigm currently in use argues that the population is adequately protected if the maximally exposed individual's dose is below a certain limit. Based on data sampled from natural populations, resource managers need to be able to test the hypothesis that the maximally exposed individual's dose is acceptable. Recognizing the difficulty of sampling the maximally exposed individual within a contaminated environment. risk assessors have used various alternative approaches. One statistic currently used is the upper 95% confidence limit on the sample mean. An alternative approach is to make no distributional assumptions and use the sample maximum value as an estimate of the maximally exposed individual. Other managers assume that an increased conservatism, added to the model parameters used to estimate risk, will compensate for the inability to sample the maximally exposed individual. While some risk assessors have changed the internationally accepted paradigm and applied recommended dose limits to representatively, rather than the maximally exposed individuals. We propose an alternative: given a sample. find the maximum likelihood estimates of the assumed population parameters and use the 99(th) percentile as an estimate of the maximally exposed individual. To determine the effectiveness of our proposed alternative, we use computer simulation techniques to generate a "population" of doses with known distributional qualities, and then mathematically "sample" this population and compare the different statistics. The simulation procedure is repeated many times, each time producing a measure of the distance between the estimate and the "true" value. We are thus able to quantify the bias associated with several approaches used to determine compliance with dose limits. C1 Univ Georgia, Savannah River Ecol Lab, Aiken, SC USA. RP Univ Georgia, Savannah River Ecol Lab, Aiken, SC USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA BN 92-0-103603-5 J9 IAEA CONF SYMP PAP PY 2003 VL 17 BP 69 EP 76 PG 8 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA BBN35 UT WOS:000226277800010 ER PT B AU Domotor, SL Wallo, A Peterson, HT Higley, KA AF Domotor, SL Wallo, A Peterson, HT Higley, KA GP IAEA TI The US Department of Energy's graded approach for evaluating radiation doses to aquatic and terrestrial biota SO PROTECTION OF THE ENVIRONMENT FROM IONISING RADIATION: THE DEVELOPMENT AND APPLICATION OF A SYSTEM OF RADIATION PROTECTION FOR THE ENVIRONMENT SE INTERNATIONAL ATOMIC ENERGY AGENCY CONFERENCE & SYMPOSIUM PAPERS LA English DT Proceedings Paper CT 3rd International Symposium on the Protection of the Environment from Ionising Radiation (SPEIR 3) CY JUL 22-26, 2002 CL Darwin, AUSTRALIA SP Environm Australia, Supervising Scientist Div, Australian Radiat Protect & Nucl Safety Agcy, Int Atom Energy Agcy AB The United States Department of Energy (DOE) currently has in place a radiation dose limit for the protection of aquatic organisms, and has considered dose limits for terrestrial biota. These limits are: 10 mGy/d for aquatic animals, 10 mGy/d for terrestrial plants, and I mGy/d for terrestrial animals. Guidance on suitable approaches to implementation of these and other proposed limits for protection of biota is needed. In response to this need, we have developed methods, models and guidance within a graded approach for evaluating radiation doses to biota. DOE's multi-tiered process is described in a technical standard document. Methods are encoded in a series of electronic spreadsheets termed the RAD-BCG Calculator to assist the user in progressing through the evaluation process. A key component of the graded approach is a screening methodology that provides limiting concentrations of radionuclides, termed Biota Concentration Guides (BCGs), for use in screening water, sediment, and soil media to determine if dose limits for biota are likely to be exceeded. The graded approach provides flexibility and the ability to iterate through the evaluation process. User-selected biota dose limits can be entered in place of default dose limits. Parameter values, radiation weighting factors, and organism residence times can be modified within site-specific screening and site-specific analysis phases of the graded approach. The methodology, available since 2000, was developed using an interdisciplinary team approach that included both "developers" and "users" through the Department's Biota Dose Assessment Committee (BDAC). DOE's graded approach framework provides a practical and effective tool for demonstrating protection of biota relative to Dose Rate Guidelines, and for conducting ecological screening assessments of radiological impact. It provides a needed evaluation tool that can be employed within an international framework for protection of the environment. C1 US DOE, Off Environm Policy & Guidance, Washington, DC 20585 USA. RP Domotor, SL (reprint author), US DOE, Off Environm Policy & Guidance, Headquarters Forrestal Bldg,1000 Independance Ave, Washington, DC 20585 USA. NR 10 TC 0 Z9 0 U1 0 U2 5 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA BN 92-0-103603-5 J9 IAEA CONF SYMP PAP PY 2003 VL 17 BP 171 EP 177 PG 7 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA BBN35 UT WOS:000226277800023 ER PT B AU Yu, C LePoire, D Arnish, J Cheng, JJ Hlohowskij, I Kamboj, S Klett, T Domotor, S Higley, K Graham, R Newkirk, P Harris, T AF Yu, C LePoire, D Arnish, J Cheng, JJ Hlohowskij, I Kamboj, S Klett, T Domotor, S Higley, K Graham, R Newkirk, P Harris, T GP IAEA TI The RESRAD-BIOTA code for application in biota dose evaluation: Providing screening and organism-specific assessment capabilities for use within an environmental protection framework SO PROTECTION OF THE ENVIRONMENT FROM IONISING RADIATION: THE DEVELOPMENT AND APPLICATION OF A SYSTEM OF RADIATION PROTECTION FOR THE ENVIRONMENT SE INTERNATIONAL ATOMIC ENERGY AGENCY CONFERENCE & SYMPOSIUM PAPERS LA English DT Proceedings Paper CT 3rd International Symposium on the Protection of the Environment from Ionising Radiation (SPEIR 3) CY JUL 22-26, 2002 CL Darwin, AUSTRALIA SP Environm Australia, Supervising Scientist Div, Australian Radiat Protect & Nucl Safety Agcy, Int Atom Energy Agcy AB The RESRAD-BIOTA code was developed through a partnership between offices of the U.S. Department of Energy, the U.S. Environmental Protection Agency, and the U.S. Nuclear Regulatory Commission. RESRAD-BIOTA is being designed to provide a full spectrum of analysis capabilities, from practical conservative screening methods using Biota Concentration Guides - to more realistic organism-specific dose assessment. A beta version of the RESRAD-BIOTA code is currently available for unofficial use and testing. Continued coordination and partnerships with U.S. agencies and international organizations is providing opportunities for the inclusion of additional evaluation approaches and capabilities, such as: (1) development of BCGs for additional radionuclides; (2) additional flexibility for specifiying and expanding organism options; (3) improvements to environmental transfer factor parameter datasets, (4) inclusion of additional "reference organism geometries" (e.g., dose conversion factors for ellipsoids of appropriate size and shielding properties for different sized organisms, appropriate for specific ecosystem types): and (5) sensitivity and uncertainty analysis capability for calculated dose estimates. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA BN 92-0-103603-5 J9 IAEA CONF SYMP PAP PY 2003 VL 17 BP 283 EP 289 PG 7 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA BBN35 UT WOS:000226277800036 ER PT B AU VanHorn, R AF VanHorn, R GP IAEA TI Evaluation and verification of foodweb uptake modeling at the Idaho National Engineering Laboratory SO PROTECTION OF THE ENVIRONMENT FROM IONISING RADIATION: THE DEVELOPMENT AND APPLICATION OF A SYSTEM OF RADIATION PROTECTION FOR THE ENVIRONMENT SE INTERNATIONAL ATOMIC ENERGY AGENCY CONFERENCE & SYMPOSIUM PAPERS LA English DT Proceedings Paper CT 3rd International Symposium on the Protection of the Environment from Ionising Radiation (SPEIR 3) CY JUL 22-26, 2002 CL Darwin, AUSTRALIA SP Environm Australia, Supervising Scientist Div, Australian Radiat Protect & Nucl Safety Agcy, Int Atom Energy Agcy AB The Idaho National Engineering and Engineering Laboratory (INEEL), a United States Department of Energy facility. is located on 2,300 square kilometers of cool desert ecosystem characterized by shrub-steppe vegetative communities. This large complex superfund site has nine "waste area groups and multiple contaminants including radionuclides. The INEEL is systematically evaluating risk to non-human receptors located at the facility. Initial assessments used foodweb modeling to calculate the potential exposure of non-human receptors to contaminants in various media. These foodweb models used literature values, which are primarily based on agricultural studies, for transport of contaminants from soil to non-human receptors. Exposure modeling accuracy is dependent on the quality of input parameter values and the validity of the model's structure (i.e., the degree to which it represents the actual relationships among parameters at the site). Site-specific field measurements of tissue residue levels (concentrations) are the most accurate exposure assessments. In 1997, 1999 and 2000, data was collected both on and off the facility to support the development of site-specific data at the INEEL. These data were compared to the literature values and modeling used in initial risk assessment screening. Results of this study, a comparison and discussion of problems and lessons learned (i.e. non-detects, potential differences in uptake in areas of greater contamination and selection of sites) are presented. C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID USA. RP VanHorn, R (reprint author), Idaho Natl Engn & Environm Lab, Idaho Falls, ID USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA BN 92-0-103603-5 J9 IAEA CONF SYMP PAP PY 2003 VL 17 BP 298 EP 308 PG 11 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA BBN35 UT WOS:000226277800038 ER PT B AU Antonio, EJ Poston, TM Tiller, BL Patton, GW AF Antonio, EJ Poston, TM Tiller, BL Patton, GW GP IAEA TI Application of RAD-BCG calculator to Hanford's 300 area shoreline characterization dataset SO PROTECTION OF THE ENVIRONMENT FROM IONISING RADIATION: THE DEVELOPMENT AND APPLICATION OF A SYSTEM OF RADIATION PROTECTION FOR THE ENVIRONMENT SE INTERNATIONAL ATOMIC ENERGY AGENCY CONFERENCE & SYMPOSIUM PAPERS LA English DT Proceedings Paper CT 3rd International Symposium on the Protection of the Environment from Ionising Radiation (SPEIR 3) CY JUL 22-26, 2002 CL Darwin, AUSTRALIA SP Environm Australia, Supervising Scientist Div, Australian Radiat Protect & Nucl Safety Agcy, Int Atom Energy Agcy AB In 2001, a multi-agency study was conducted to characterize potential environmental effects from radiological and chemical contaminants on the near-shore environment of the Columbia River at the 300 Area of the U.S. Department of Energy's Hanford Site. Historically, the 300 Area was the location of nuclear fuel fabrication and was the main location for research and development activities from the 1940s until the late 1980s. During past waste handling practices uranium, copper, and other heavy metals were routed to liquid waste streams and ponds near the Columbia River shoreline. The Washington State Department of Health and the Pacific Northwest National Laboratory's Surface Environmental Surveillance Project sampled various environmental components including river water. riverbank spring water, sediment, fishes, crustaceans, bivalve mollusks, aquatic insects, riparian vegetation, small mammals, and terrestrial invertebrates for analyses of radiological and chemical constituents. The radiological analysis results for water and sediment were used as initial input into the RAD-BCG Calculator. The RAD-BCG Calculator, a computer program that uses an Excel((R)) spreadsheet and Visual Basic((R)) software, showed that maximum radionuclide concentrations measured in water and sediment were lower than the initial screening criteria for concentrations to produce dose rates at existing or proposed limits. Radionuclide concentrations measured in biota samples were used to calculate site-specific bioaccumulation coefficients (B-iv) to test the utility of the RAD-BCG-Calculator's site-specific screening phase. To further evaluate site-specific effects, the default Relative Biological Effect (RBE) for internal alpha particle emissions was reduced by half and the program's kinetic/allometric calculation approach was initiated. The subsequent calculations showed the initial RAD-BCG Calculator results to be conservative, which is appropriate for screening purposes. C1 Pacific NW Natl Lab, Richland, WA USA. RP Antonio, EJ (reprint author), Pacific NW Natl Lab, Richland, WA USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA BN 92-0-103603-5 J9 IAEA CONF SYMP PAP PY 2003 VL 17 BP 309 EP 316 PG 8 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA BBN35 UT WOS:000226277800039 ER PT B AU Poston, TM Antonio, EJ Peterson, RE AF Poston, TM Antonio, EJ Peterson, RE GP IAEA TI Application of biota dose assessment committee methodology to assess radiological risk to salmonids in the Hanford reach of the Columbia River SO PROTECTION OF THE ENVIRONMENT FROM IONISING RADIATION: THE DEVELOPMENT AND APPLICATION OF A SYSTEM OF RADIATION PROTECTION FOR THE ENVIRONMENT SE INTERNATIONAL ATOMIC ENERGY AGENCY CONFERENCE & SYMPOSIUM PAPERS LA English DT Proceedings Paper CT 3rd International Symposium on the Protection of the Environment from Ionising Radiation (SPEIR 3) CY JUL 22-26, 2002 CL Darwin, AUSTRALIA SP Environm Australia, Supervising Scientist Div, Australian Radiat Protect & Nucl Safety Agcy, Int Atom Energy Agcy AB Protective guidance for the protection of biota in the U.S. Department of Energy's Graded Approach for Evaluating Radiation Doses to Aquatic and Terrestrial Biota is based on population level protection guides of 10 or 1 mGyd(-1), respectively. Several "ecologically significant units" of Pacific salmon are listed under the ESA. The Hanford Reach supports one of the largest spawning populations of fall chinook salmon in the Northwest. Listed units of steelhead are located upstream of Hanford and in an adjacent river basin. The existence of the major spawning areas in the Hanford Reach has focused considerable attention on their ecological health by the Department of Energy, state and other federal regulatory agencies, and special interest groups. Dose assessments for developing salmonid embryos were performed for the hypothetical exposure to tritium, strontium-90, technetium-99, iodine-129, and uranium isotopes at specific sites on the Hanford Reach. These early life stages are potentially exposed in some areas of the Hanford Reach to radiological contaminants that enter the river via shoreline seeps and upwelling through the river substrate. At the Tier I screening level, no site approached the dose guideline of 10 mGy d(-1) established with the RAD-BCG calculator. Special status of listed species affords these populations more consideration when assess potential impacts of exposure to radionuclides and other contaminants associated with Hanford Site operations. The evolution of dose benchmarks for aquatic organisms and consideration of precautionary principal and cumulative impacts are addressed. C1 Pacific NW Natl Lab, Richland, WA USA. RP Poston, TM (reprint author), Pacific NW Natl Lab, Richland, WA USA. NR 18 TC 0 Z9 0 U1 0 U2 3 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA BN 92-0-103603-5 J9 IAEA CONF SYMP PAP PY 2003 VL 17 BP 397 EP 405 PG 9 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA BBN35 UT WOS:000226277800050 ER PT B AU Jones, DS Scofield, PA Domotor, SL AF Jones, DS Scofield, PA Domotor, SL GP IAEA TI Implementation and validation of the USDOE graded approach for evaluating radiation impacts on biota at long-term stewardship sites SO PROTECTION OF THE ENVIRONMENT FROM IONISING RADIATION: THE DEVELOPMENT AND APPLICATION OF A SYSTEM OF RADIATION PROTECTION FOR THE ENVIRONMENT SE INTERNATIONAL ATOMIC ENERGY AGENCY CONFERENCE & SYMPOSIUM PAPERS LA English DT Proceedings Paper CT 3rd International Symposium on the Protection of the Environment from Ionising Radiation (SPEIR 3) CY JUL 22-26, 2002 CL Darwin, AUSTRALIA SP Environm Australia, Supervising Scientist Div, Australian Radiat Protect & Nucl Safety Agcy, Int Atom Energy Agcy AB The DOE Technical Standard, "A Graded Approach for Evaluating Radiation Doses to Aquatic and Terrestrial Biota" (the Graded Approach) was used to evaluate two geographically discrete DOE sites, Bear Creek Valley (BCV) in Oak Ridge, Tennessee and the Test Reactor Area (TRA) ponds in Idaho Falls, Idaho. The first step entailed reviewing existing ecological risk assessments (ERAs) of contaminated waste sites and selecting the most appropriate sites for testing the Graded Approach, based on the existence of measurable radiological contamination and biological data. Ambient media (soil) data were evaluated using the initial (conservative) screening protocol in the Graded Approach. The next step entailed comparing the results from the Graded Approach with those of the existing ERAs for each site, which were used as the primary standard of performance. The default (conservative) screening protocol correctly classified the positive control site (TRA) as posing potential risks to biota and the negative control site (BCV) as not posing potential risks to biota, based on exposures to ionizing radiation. Future evaluations will use both ambient media and the available biota data to test the more realistic tiers (i.e., the Analysis Phase) of the Graded Approach. C1 Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA. RP Jones, DS (reprint author), Oak Ridge Natl Lab, Div Environm Sci, POB 2008, Oak Ridge, TN 37831 USA. NR 6 TC 0 Z9 0 U1 0 U2 2 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA BN 92-0-103603-5 J9 IAEA CONF SYMP PAP PY 2003 VL 17 BP 406 EP 409 PG 4 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA BBN35 UT WOS:000226277800051 ER PT J AU Sharp, JA Kaufman, PD AF Sharp, JA Kaufman, PD TI Chromatin proteins are determinants of centromere function SO PROTEIN COMPLEXES THAT MODIFY CHROMATIN SE CURRENT TOPICS IN MICROBIOLOGY AND IMMUNOLOGY LA English DT Review ID ASSEMBLY FACTOR-I; POSITION-EFFECT VARIEGATION; FISSION YEAST CENTROMERES; DNA-REPLICATION INVITRO; SACCHAROMYCES-CEREVISIAE CENTROMERES; HETEROCHROMATIN-ASSOCIATED PROTEIN; NEWLY SYNTHESIZED HISTONES; INNER KINETOCHORE PLATE; CELL-CYCLE PROGRESSION; BASE-PAIR MUTATIONS AB Recent advances in the identification of molecular components of centromeres have demonstrated a crucial role for chromatin proteins in determining both centromere identity and the stability of kinetochore-microtubule attachments. Although we are far from a complete understanding of the establishment and propagation of centromeres, this review seeks to highlight the contribution of histones, histone deposition factors, histone modifying enzymes, and heterochromatin proteins to the assembly of this sophisticated, highly specialized chromatin structure. First, an overview of DNA sequence elements at centromeric regions will be presented. We will then discuss the contribution of chromatin to kinetochore function in budding yeast, and pericentric heterochromatin domains in other eukaryotic systems. We will conclude with discussion of specialized nucleosomes that direct kinetochore assembly and propagation of centromere-defining chromatin domains. C1 Univ Calif Berkeley, Berkeley, CA 94720 USA. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Sharp, JA (reprint author), Univ Calif Berkeley, Stanley Hall,Mail Code 3206, Berkeley, CA 94720 USA. FU NIGMS NIH HHS [1 R01 GM55712, R01 GM055712] NR 155 TC 16 Z9 16 U1 1 U2 1 PU SPRINGER-VERLAG BERLIN PI BERLIN PA HEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANY SN 0070-217X J9 CURR TOP MICROBIOL JI Curr.Top.Microbiol.Immunol. PY 2003 VL 274 BP 23 EP 52 PG 30 WC Immunology; Microbiology SC Immunology; Microbiology GA BW29C UT WOS:000181449100002 PM 12596903 ER PT J AU Ryan, RO Forte, TM Oda, MN AF Ryan, RO Forte, TM Oda, MN TI Optimized bacterial expression of human apolipoprotein A-I SO PROTEIN EXPRESSION AND PURIFICATION LA English DT Article ID ESCHERICHIA-COLI; PROTEIN; OVEREXPRESSION; MUTAGENESIS; CHOLESTEROL; DOMAIN; ABCA1 AB Apolipoprotein A-I (apoA-I) serves critical functions in plasma lipoprotein metabolism as a structural component of high density lipoprotein, activator of lecithin: cholesterol acyltransferase, and acceptor of cellular cholesterol as part of the reverse cholesterol transport pathway. In an effort to facilitate structure: function studies of human apoA-I, we have optimized a plasmid vector for production of recombinant wild type (WT) and mutant apoA-I in bacteria. To facilitate mutagenesis studies, subcloning, and DNA manipulation, numerous silent mutations have been introduced into the apoA-I cDNA, generating 13 unique restriction endonuclease sites. The coding sequence for human apoA-I has been modified by the introduction of additional silent mutations that eliminate 18 separate codons that employ tRNAs that are of low or moderate abundance in Escherichia coli. Yields of recombinant apoA-I achieved using the optimized cDNA were 100 +/- 20 mg/L bacterial culture, more than fivefold greater than yields routinely obtained with the original cDNA. Site-directed mutagenesis of the apoA-I cDNA was performed to generate a Glu2Asp mutation in the N-terminal sequence of apoA-I. This modification, which creates an acid labile Asp-Pro peptide bond between amino acids 2 and 3, permits specific chemical cleavage of an N-terminal His-Tag fusion peptide used for rapid protein purification. The product protein's primary structure is identical to WT apoA-I in all other respects. Together, these changes in apoA-I cDNA and bacterial expression protocol significantly improve the yield of apoA-I protein without compromising the relative ease of purification. (C) 2002 Elsevier Science (USA). All rights reserved. C1 Childrens Hosp, Oakland Res Inst, Lipid Biol Hlth & Dis Res Grp, Oakland, CA 94609 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Mol Med, Div Life Sci, Berkeley, CA 94720 USA. RP Oda, MN (reprint author), Childrens Hosp, Oakland Res Inst, Lipid Biol Hlth & Dis Res Grp, 5700 Matin Luther King Jr Way, Oakland, CA 94609 USA. NR 19 TC 90 Z9 97 U1 4 U2 15 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 1046-5928 J9 PROTEIN EXPRES PURIF JI Protein Expr. Purif. PD JAN PY 2003 VL 27 IS 1 BP 98 EP 103 AR PII S1046-5928(02)00568-5 DI 10.1016/S1046-5928(02)00568-5 PG 6 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 640FX UT WOS:000180678700013 PM 12509990 ER PT J AU Moult, J Fidelis, K Zemla, A Hubbard, T AF Moult, J Fidelis, K Zemla, A Hubbard, T TI Critical assessment of methods of protein structure prediction (CASP)-round V SO PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS LA English DT Article; Proceedings Paper CT 5th Meeting on the Critical Assessment of Techniques for Protein Structure Prediction CY DEC 01-05, 2002 CL PACIFIC GROVE, CA DE protein structure prediction; communitywide experiment; CASP ID FOLD RECOGNITION; PROGRESS; CASP4; PERFORMANCE; SERVERS; TEAMS; META AB This article provides an introduction to the special issue of the journal Proteins dedicated to the fifth CASP experiment to assess the state of the art in protein structure prediction. The article describes the conduct, the categories of prediction, and the evaluation and assessment procedures of the experiment. A brief summary of progress over the five CASP experiments is provided. Related developments in the field are also described. (C) 2003 Wiley-Liss, Inc. C1 Univ Maryland, Maryland Biotechnol Inst, Ctr Adv Res Biotechnol, Rockville, MD 20850 USA. Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA USA. RP Moult, J (reprint author), Univ Maryland, Maryland Biotechnol Inst, Ctr Adv Res Biotechnol, 9600 Gudelsky Dr, Rockville, MD 20850 USA. EM moult@umbi.umd.edu RI Hubbard, Tim/C-2567-2008; OI Hubbard, Tim/0000-0002-1767-9318; Moult, John/0000-0002-3012-2282 FU NIGMS NIH HHS [GM/DK61967]; NLM NIH HHS [LM07085] NR 29 TC 145 Z9 150 U1 2 U2 5 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0887-3585 J9 PROTEINS JI Proteins PY 2003 VL 53 SU S BP 334 EP 339 DI 10.1002/prot.10556 PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 740AF UT WOS:000186378100002 PM 14579322 ER PT J AU Venclovas, C AF Venclovas, C TI Comparative modeling in CASP5: Progress is evident, but alignment errors remain a significant hindrance SO PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS LA English DT Article; Proceedings Paper CT 5th Meeting on the Critical Assessment of Techniques for Protein Structure Prediction CY DEC 01-05, 2002 CL PACIFIC GROVE, CA DE protein structure prediction; sequence-structure alignment; 3D model; model evaluation; distant homology; alignment errors ID PROTEIN SECONDARY STRUCTURE; TARGET PROTEINS; CLASSIFICATION; PREDICTIONS; RECOGNITION; DATABASE; SEARCH AB Models for 20 comparative modeling targets were submitted for the fifth round of the "blind" test of protein structure prediction methods (CASP5; http://predictioncenter.llnl.gov/casp5). The modeling approach used in CASP5 was similar to that used 2 years ago in CASP4 (Venclovas, Proteins 2001; Suppl 5:47-54). The main features of this approach include use of multiple templates, initial assessment of alignment reliability in a region-specific manner, and structure-based selection of alignment variants in unreliable regions. The CASP5 modeling results presented here show significant improvement in comparison to CASP4, especially in the area of distant homology. The improvements include more effective use of multiple templates and better alignments. However, a number of structurally conserved regions in submitted distant homology models were misaligned. Analysis of these errors indicates that the absolute majority of them occurred in regions deemed unreliable in the course of model building. Most of these error-prone regions can be characterized by their peripheral location and a lack of conserved sequence patterns. For a few of the error-prone regions, all methods evaluated during CASP5 proved ineffective, pointing to the need for more sensitive energy-based methods. Despite these remaining issues, the applicability of comparative modeling continues to expand into more distant evolutionary relationships, providing a means to structurally characterize a significant number of currently available protein sequences. (C) 2003 Wiley-Liss, Inc. C1 Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA 94551 USA. RP Venclovas, C (reprint author), Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, POB 5508, Livermore, CA 94551 USA. EM venclovas@llnl.gov NR 24 TC 40 Z9 41 U1 0 U2 0 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0887-3585 J9 PROTEINS JI Proteins PY 2003 VL 53 SU S BP 380 EP 388 DI 10.1002/prot.10591 PG 9 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 740AF UT WOS:000186378100006 PM 14579326 ER PT J AU Chivian, D Kim, DE Malmstrom, L Bradley, P Robertson, T Murphy, P Strauss, CEM Bonneau, R Rohl, CA Baker, D AF Chivian, D Kim, DE Malmstrom, L Bradley, P Robertson, T Murphy, P Strauss, CEM Bonneau, R Rohl, CA Baker, D TI Automated prediction of CASP-5 structures using the Robetta server SO PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS LA English DT Article; Proceedings Paper CT 5th Meeting on the Critical Assessment of Techniques for Protein Structure Prediction CY DEC 01-05, 2002 CL PACIFIC GROVE, CA DE automated protein structure prediction server; CASP; CAFASP; rosetta; fragment insertion; fragment assembly; ab initio modeling; de novo modeling; template-based modeling; domain parsing; homology modeling; comparative modeling; sequence alignment ID PROTEIN SECONDARY STRUCTURE; HIDDEN MARKOV-MODELS; FOLD RECOGNITION; PSI-BLAST; SEQUENCES; DATABASE; PROFILES; FAMILIES; MATRICES; FEATURES AB Robetta is a fully automated protein structure prediction server that uses the Rosetta fragment-insertion method. It combines template-based and de novo structure prediction methods in an attempt to produce high quality models that cover every residue of a submitted sequence. The first step in the procedure is the automatic detection of the locations of domains and selection of the appropriate modeling protocol for each domain. For domains matched to a homolog with an experimentally characterized structure by PSI-BLAST or Pcons2, Robetta uses a new alignment method, called K*Sync, to align the query sequence onto the parent structure. It then models the variable regions by allowing them to explore conformational space with fragments in fashion similar to the de novo protocol, but in the context of the template. When no structural homolog is available, domains are modeled with the Rosetta de novo protocol, which allows the full length of the domain to explore conformational space via fragment-insertion, producing a large decoy ensemble from which the final models are selected. The Robetta server produced quite reasonable predictions for targets in the recent CASP-5 and CAFASP-3 experiments, some of which were at the level of the best human predictions. (C) 2003 Wiley-Liss, Inc. C1 Univ Washington, HHMI, Seattle, WA 98195 USA. Univ Washington, Dept Biochem, Seattle, WA 98195 USA. Los Alamos Natl Lab, Los Alamos, NM USA. Inst Syst Biol, Seattle, WA USA. Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA. RP Baker, D (reprint author), Univ Washington, HHMI, Box 357350, Seattle, WA 98195 USA. EM dabaker@u.washington.edu RI Rohl, Carol/I-2589-2012; Baker, David/K-8941-2012; OI Rohl, Carol/0000-0002-9229-3917; Baker, David/0000-0001-7896-6217; Malmstrom, Lars/0000-0001-9885-9312 NR 29 TC 168 Z9 175 U1 0 U2 7 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0887-3585 J9 PROTEINS JI Proteins PY 2003 VL 53 SU S BP 524 EP 533 DI 10.1002/prot.10529 PG 10 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 740AF UT WOS:000186378100022 PM 14579342 ER PT J AU Venclovas, C Zemla, A Fidelis, K Moult, J AF Venclovas, C Zemla, A Fidelis, K Moult, J TI Assessment of progress over the CASP experiments SO PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS LA English DT Article; Proceedings Paper CT 5th Meeting on the Critical Assessment of Techniques for Protein Structure Prediction CY DEC 01-05, 2002 CL PACIFIC GROVE, CA DE protein structure prediction; communitywide experiment; CASP ID PROTEIN-STRUCTURE PREDICTION; PERFORMANCE AB The quality of structure models produced in the CASP5 experiment has been compared with that in earlier CASPs. The most significant progress is in the fold recognition regime, where the development of meta-servers has allowed more accurate consensus models to be generated. In contrast to this, there is little evidence of progress in producing more accurate comparative models, particularly those based on sequence identities > 30%. For comparative models based on low-sequence identity and for fold recognition models, accuracy depends primarily on the fraction of the target structure that is similar to an available template, and the quality of the alignment. Overall, these results indicate that there are still no effective methods of improving model quality beyond that obtained by successfully copying a template structure. For models of proteins with previously unknown folds, there appears to be a pause in the previous consistent improvement. There is some evidence that more groups are producing top-quality models, however. Although specific progress between successive experiments is sometimes difficulty to identify, over the history of all the CASPs there has been steady, if sometimes slow, progress in all modeling regimes. (C) 2003 Wiley-Liss, Inc. C1 Univ Maryland, Maryland Biotechnol Inst, Ctr Adv Res Biotechnol, Rockville, MD 20850 USA. Inst Biotechnol, LT-2028 Vilnius, Lithuania. Lawrence Livermore Natl Lab, Biol & Biotechnol Res Program, Livermore, CA USA. RP Moult, J (reprint author), Univ Maryland, Maryland Biotechnol Inst, Ctr Adv Res Biotechnol, 9600 Gudelsky Dr, Rockville, MD 20850 USA. EM jmoult@tunc.org OI Moult, John/0000-0002-3012-2282 FU NLM NIH HHS [LM07085-01] NR 11 TC 87 Z9 89 U1 2 U2 3 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0887-3585 J9 PROTEINS JI Proteins PY 2003 VL 53 SU S BP 585 EP 595 DI 10.1002/prot.10530 PG 11 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA 740AF UT WOS:000186378100030 PM 14579350 ER PT J AU Smith, RD Anderson, GA Lipton, MS Masselon, C Pasa-Tolic, L Udseth, H Belov, M Shen, YF Veenstra, TD AF Smith, RD Anderson, GA Lipton, MS Masselon, C Pasa-Tolic, L Udseth, H Belov, M Shen, YF Veenstra, TD TI High-performance separations and mass spectrometric methods for high-throughput proteomics using accurate mass tags SO PROTEOME CHARACTERIZATION AND PROTEOMICS SE ADVANCES IN PROTEIN CHEMISTRY LA English DT Review ID ION-CYCLOTRON RESONANCE; CAPILLARY LIQUID-CHROMATOGRAPHY; COMPLEX PEPTIDE MIXTURES; DEINOCOCCUS-RADIODURANS; ELECTROSPRAY-IONIZATION; PROTEIN IDENTIFICATION; SACCHAROMYCES-CEREVISIAE; HAEMOPHILUS-INFLUENZAE; QUANTITATIVE-ANALYSIS; POLYACRYLAMIDE-GELS C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA. RP Smith, RD (reprint author), SAIC Frederick Inc, Biomed Proteom Program, Analyt Chem Lab, NCI, POB B, Ft Detrick, MD 21702 USA. RI Masselon, Christophe/A-2340-2010; Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 FU NCI NIH HHS [CA81654]; NCRR NIH HHS [RR12365]; NINDS NIH HHS [NS39617] NR 65 TC 8 Z9 8 U1 0 U2 4 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 USA SN 0065-3233 J9 ADV PROTEIN CHEM JI Adv.Protein Chem. PY 2003 VL 65 BP 85 EP + PG 49 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA BX44S UT WOS:000185287400004 PM 12964367 ER PT J AU Giometti, CS AF Giometti, CS TI Proteomics and bioinformatics SO PROTEOME CHARACTERIZATION AND PROTEOMICS SE ADVANCES IN PROTEIN CHEMISTRY LA English DT Review ID MASS-SPECTROMETRY; HAEMOPHILUS-INFLUENZAE; MYCOPLASMA-GENITALIUM; PROTEIN; SEQUENCE; IDENTIFICATION; PREDICTION; DATABASES; ALIGNMENT; SYSTEM C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Giometti, CS (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 39 TC 5 Z9 5 U1 0 U2 0 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 USA SN 0065-3233 J9 ADV PROTEIN CHEM JI Adv.Protein Chem. PY 2003 VL 65 BP 353 EP + PG 24 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA BX44S UT WOS:000185287400013 PM 12964376 ER PT S AU Rykaczewski, KP Grzywacz, R Batchelder, JC Bingham, CR Fong, D Ginter, TN Gross, CJ Hamilton, JH Hartley, DJ Hwang, JK Janas, Z Karny, M Krolas, W Kulp, WD Larochelle, Y Lewis, TA Maier, KH McConnell, JW Piechaczek, A Ramayya, AV Rykaczewski, K Shapira, D Tantawy, MN Winger, JA Yu, CH Zganjar, EF Hagino, K Kruppa, AT Nazarewicz, W Semmes, P Vertse, T AF Rykaczewski, KP Grzywacz, R Batchelder, JC Bingham, CR Fong, D Ginter, TN Gross, CJ Hamilton, JH Hartley, DJ Hwang, JK Janas, Z Karny, M Krolas, W Kulp, WD Larochelle, Y Lewis, TA Maier, KH McConnell, JW Piechaczek, A Ramayya, AV Rykaczewski, K Shapira, D Tantawy, MN Winger, JA Yu, CH Zganjar, EF Hagino, K Kruppa, AT Nazarewicz, W Semmes, P Vertse, T BE Maglione, E Soramel, F TI Fine structure in one-proton emission studied at Oak Ridge SO PROTON-EMITTING NUCLEI SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 2nd International Symposium on Proton-Emitting Nuclei CY FEB 12-15, 2003 CL LEGNARO NATL LAB, LEGNARO, ITALY SP Ist Nazl Fis Nucl, Univ Padova, Univ Udine HO LEGNARO NATL LAB ID NUCLEI; DECAY; RADIOACTIVITY; SPECTROSCOPY; STATES AB Two observations of fine structure in proton emission are reported: 3-mus Tm-145 and 4-ms Ho-141. These experiments were performed using the Recoil Mass Separator (RMS) at the Holifield Radioactive Ion Beam Facility at Oak Ridge. The signals from the RMS detectors were digitally processed using Digital Gamma Finder modules. The fine structure branching ratios, 9.6 +/- 1.5% and 0.70 +/- 0.15%, and measured energies of the 2(+) excited levels in daughter nuclei, 330 and 202 keV, respectively, helped us to determine the deformations and wave functions of proton-emitting states. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RP Rykaczewski, KP (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RI Krolas, Wojciech/N-9391-2013 NR 37 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 0-7354-0150-0 J9 AIP CONF PROC PY 2003 VL 681 BP 11 EP 17 PG 7 WC Physics, Nuclear SC Physics GA BX56X UT WOS:000185703300002 ER PT S AU Davids, CN Esbensen, H AF Davids, CN Esbensen, H BE Maglione, E Soramel, F TI Fine structure and triaxial deformation in proton radioactivity SO PROTON-EMITTING NUCLEI SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 2nd International Symposium on Proton-Emitting Nuclei CY FEB 12-15, 2003 CL LEGNARO NATL LAB, LEGNARO, ITALY SP Ist Nazl Fis Nucl, Univ Padova, Univ Udine HO LEGNARO NATL LAB AB We report on theoretical calculations in proton radioactivity that have been carried out over the past 2 years at Argonne National Laboratory. This includes calculations of decay rates for near-spherical proton emitters based on particle-vibration coupling [1], fine structure in the proton decay of Ho-141 [2], and recent work on the effect of triaxiality on the decay rate of a deformed proton emitter. C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Davids, CN (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 0-7354-0150-0 J9 AIP CONF PROC PY 2003 VL 681 BP 41 EP 49 PG 9 WC Physics, Nuclear SC Physics GA BX56X UT WOS:000185703300006 ER PT S AU Batchelder, JC Toth, KS Rowe, MW Ginter, TN Gregorich, KE Ninov, VE Guo, FQ Powell, J Xu, XJ Cerny, J AF Batchelder, JC Toth, KS Rowe, MW Ginter, TN Gregorich, KE Ninov, VE Guo, FQ Powell, J Xu, XJ Cerny, J BE Maglione, E Soramel, F TI Evidence for the identification of Pb-178 SO PROTON-EMITTING NUCLEI SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 2nd International Symposium on Proton-Emitting Nuclei CY FEB 12-15, 2003 CL LEGNARO NATL LAB, LEGNARO, ITALY SP Ist Nazl Fis Nucl, Univ Padova, Univ Udine HO LEGNARO NATL LAB ID GAS-FILLED SEPARATOR; ALPHA-DECAY; PROTON; NUCLEI AB With the use of the Berkeley Gas-filled Separator, the cc decay of Pb-178 was identified in Kr-78 irradiations of Pd-102. Following their separation from the incident beam particles, reaction products were implanted in a position-sensitive silicon detector. Two events with E-alpha of 7602 and 7629 keV were observed and assigned to Pb-178 because they were position-correlated with. known descendants in the Hg-174 alpha-decay chain. The half-life of Pb-178 was calculated with. the maximum likelihood method to be 122(-50)(+290) mus. A mass excess of 3608(39) keV and a proton separation energy of 362(48) keV were deduced for Pb-178 based on the known masses of Hg-174 and Tl-177. C1 Oak Ridge Associated Univ, UNIRIB, Oak Ridge, TN 37831 USA. RP Batchelder, JC (reprint author), Oak Ridge Associated Univ, UNIRIB, Oak Ridge, TN 37831 USA. NR 12 TC 2 Z9 2 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 0-7354-0150-0 J9 AIP CONF PROC PY 2003 VL 681 BP 144 EP 148 PG 5 WC Physics, Nuclear SC Physics GA BX56X UT WOS:000185703300018 ER PT S AU Seweryniak, D AF Seweryniak, D BE Maglione, E Soramel, F TI Rotational bands in rare-earth proton emitters and neighboring nuclei SO PROTON-EMITTING NUCLEI SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 2nd International Symposium on Proton-Emitting Nuclei CY FEB 12-15, 2003 CL LEGNARO NATL LAB, LEGNARO, ITALY SP Ist Nazl Fis Nucl, Univ Padova, Univ Udine HO LEGNARO NATL LAB ID GAMMA-RAY SPECTROSCOPY; FINE-STRUCTURE; DECAY AB The anomalous proton-decay rates in Eu-131 and Ho-141 have been explained by the presence of large quadrupole deformation. Consistent with this hypothesis was the discovery of the decay branch in Eu-131 to the 2(+) state in the daughter nucleus. Direct evidence that Ho-141 and Eu-131 are deformed came from the observation of rotational bands. From the dynamic moment of inertia the deformation of beta(2)=0.25(4) was deduced for the Ho-141 ground state. The large signature splitting in the ground-state band in Ho-141 indicates that Coriolis mixing plays an important role in this nucleus. The comparison between the Particle-Rotor Model and the data indicates that Ho-141 has significant hexadecapole deformation and/or might be triaxial. The comparison between theory and experiment constrains other parameters used in the proton decay rate calculations from deformed nuclei such as the Coriolis interaction and pairing strength. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Seweryniak, D (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 10 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 0-7354-0150-0 J9 AIP CONF PROC PY 2003 VL 681 BP 161 EP 171 PG 11 WC Physics, Nuclear SC Physics GA BX56X UT WOS:000185703300020 ER PT S AU Yu, CH Batchelder, JC Bingham, CR Gross, CJ Grzywacz, R Rykaczewski, K AF Yu, CH Batchelder, JC Bingham, CR Gross, CJ Grzywacz, R Rykaczewski, K BE Maglione, E Soramel, F TI Gamma-ray spectroscopy beyond the proton drip line SO PROTON-EMITTING NUCLEI SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 2nd International Symposium on Proton-Emitting Nuclei CY FEB 12-15, 2003 CL LEGNARO NATL LAB, LEGNARO, ITALY SP Ist Nazl Fis Nucl, Univ Padova, Univ Udine HO LEGNARO NATL LAB ID HIGH-SPIN STATES; IN-BEAM; NONCOLLECTIVE OBLATE; RADIOACTIVITY; NUCLEI; DECAY; EU-143(63)80; FEATURES; SN-100; CS-113 AB A series of experiments were performed to establish excited states in proton emitters Lu-151, I-109 and Cs-113. These experiments used (HI, p2n) reactions to populate the proton emitters and employed the recoil decay tagging technique to identify gamma rays in the corresponding proton-unbound nucleus. Gamma-decay sequences were established in these nuclei and their configurations were tentatively assigned based on systematic trends. This paper reviews the three experimental studies and discusses the data in comparison with those of their neighboring nuclei. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RP Yu, CH (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. NR 35 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 0-7354-0150-0 J9 AIP CONF PROC PY 2003 VL 681 BP 172 EP 182 PG 11 WC Physics, Nuclear SC Physics GA BX56X UT WOS:000185703300021 ER PT S AU Krolas, W Grzywacz, R Rykaczewski, KP Batchelder, JC Bingham, CR Gross, CJ Fong, D Hamilton, JH Hartley, DJ Hwang, JK Larochelle, Y Lewis, TA Maier, KH McConnell, JW Piechaczek, A Ramayya, AV Rykaczewski, K Shapira, D Tantawy, MN Winger, JA Yu, CH Zganjar, EF Kruppa, AT Nazarewicz, W Vertse, T AF Krolas, W Grzywacz, R Rykaczewski, KP Batchelder, JC Bingham, CR Gross, CJ Fong, D Hamilton, JH Hartley, DJ Hwang, JK Larochelle, Y Lewis, TA Maier, KH McConnell, JW Piechaczek, A Ramayya, AV Rykaczewski, K Shapira, D Tantawy, MN Winger, JA Yu, CH Zganjar, EF Kruppa, AT Nazarewicz, W Vertse, T BE Maglione, E Soramel, F TI First observation of excited states in Dy-140 SO PROTON-EMITTING NUCLEI SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 2nd International Symposium on Proton-Emitting Nuclei CY FEB 12-15, 2003 CL LEGNARO NATL LAB, LEGNARO, ITALY SP Ist Nazl Fis Nucl, Univ Padova, Univ Udine HO LEGNARO NATL LAB ID IDENTIFICATION; EMISSION AB The mass A = 140 products of the Fe-54(315 MeV) + Mo-92 reaction were selected by a recoil mass spectrometer and studied in a recoil - delayed gamma-gamma coincidence experiment. A new 7 mus isomer was identified in the drip line nucleus Dy-140. Five cascading 7 transitions were assigned to the decay of the I-pi = 8(-) {v9/2(-)[514] circle times v7/2(+)[404]} K isomer via the ground state band transitions. The established structure of Dy-140 is discussed with reference to the fine structure in proton decay of Ho-141. C1 Oak Ridge Natl Lab, Joint Inst Heavy Ion Res, Oak Ridge, TN 37831 USA. RP Krolas, W (reprint author), Oak Ridge Natl Lab, Joint Inst Heavy Ion Res, Oak Ridge, TN 37831 USA. RI Krolas, Wojciech/N-9391-2013 NR 13 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 0-7354-0150-0 J9 AIP CONF PROC PY 2003 VL 681 BP 183 EP 186 PG 4 WC Physics, Nuclear SC Physics GA BX56X UT WOS:000185703300022 ER PT S AU Grzywacz, R AF Grzywacz, R BE Maglione, E Soramel, F TI Digital spectroscopy for proton emitters SO PROTON-EMITTING NUCLEI SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 2nd International Symposium on Proton-Emitting Nuclei CY FEB 12-15, 2003 CL LEGNARO NATL LAB, LEGNARO, ITALY SP Ist Nazl Fis Nucl, Univ Padova, Univ Udine HO LEGNARO NATL LAB ID DECAY; DETECTORS AB The detection system based on Digital Signal Processing has been developed at ORNL and applied to study proton radioactivity. Novel concepts of the Digital Spectroscopy are presented. They have been applied in experiments difficult or impossible to perform with standard systems which combine shaping amplifiers with analog-to-digital converters. The DSP features, such as, trigger-less operation, pulse shape recording and pulse shape based triggering schemes, led to successful measurements of the fine structure in the proton decay of Tm-145 and Ho-141 and to observation of the two-proton emission in Fe-45. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37830 USA. RP Grzywacz, R (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37830 USA. NR 21 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 0-7354-0150-0 J9 AIP CONF PROC PY 2003 VL 681 BP 259 EP 267 PG 9 WC Physics, Nuclear SC Physics GA BX56X UT WOS:000185703300032 ER PT J AU de Vries, W AF de Vries, W TI Properties of radio source host galaxies SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA LA English DT Article; Proceedings Paper CT 3rd Workshop on Compact Steep Spectrum and Gigahertz-Peaked Spectrum Radio Sources CY MAY 28-31, 2002 CL KERASTARI, GREECE DE galaxies : active; galaxies : nuclei; radio continuum : galaxies ID COMPACT STEEP-SPECTRUM; EMISSION-LINE NEBULAE; OPTICAL SPECTROSCOPY; SURFACE PHOTOMETRY; GIGAHERTZ; EVOLUTION; CLUSTERS AB A brief overview of the current radio source host galaxy state of affairs is given. All the evidence appears to point towards a scenario in which the young radio source expands through the host galaxy on timescales of 10(5)-10(6) yr, before it ends its life as a large scale FR II radio galaxy. The place and role of the quasars in this evolutionary picture is unclear, however, and remains an issue of debate. C1 Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP de Vries, W (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, 7000 E Ave, Livermore, CA 94550 USA. NR 25 TC 6 Z9 6 U1 0 U2 1 PU C S I R O PUBLISHING PI COLLINGWOOD PA 150 OXFORD ST, PO BOX 1139, COLLINGWOOD, VICTORIA 3066, AUSTRALIA SN 1323-3580 J9 PUBL ASTRON SOC AUST JI Publ. Astron. Soc. Aust. PY 2003 VL 20 IS 1 BP 6 EP 11 DI 10.1071/AS02030 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 685RV UT WOS:000183277800004 ER PT J AU Labiano, A O'Dea, CP Gelderman, R de Vries, WH Axon, DJ Barthel, PD Baum, SA Capetti, A Fanti, R Koekemoer, AM Morganti, R Tadhunter, CN AF Labiano, A O'Dea, CP Gelderman, R de Vries, WH Axon, DJ Barthel, PD Baum, SA Capetti, A Fanti, R Koekemoer, AM Morganti, R Tadhunter, CN TI HST/STIS spectroscopy of CSS sources: Kinematics and ionisation of the aligned nebulae SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA LA English DT Article; Proceedings Paper CT 3rd Workshop on Compact Steep Spectrum and Gigahertz-Peaked Spectrum Radio Sources CY MAY 28-31, 2002 CL KERASTARI, GREECE DE galaxies : active; galaxies : individual (3C 277.1; 3C 67); quasars : emission lines ID SPECTRUM RADIO-SOURCES; EMISSION; GALAXIES AB We have obtained long slit spectra of 3C 67 and 3C 277.1 with the HST/STIS spectrograph. We present our preliminary results on the diagnostic emission line ratios along the radio source axes in 3C 67 and 3C 277.1. C1 Space Telescope Sci Inst, Baltimore, MD 21218 USA. Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands. Western Kentucky Univ, Bowling Green, KY 42101 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Hertfordshire, Hatfield AL10 9AB, Herts, England. Osserv Astron Torino, I-10025 Pino Torinese, TO, Italy. CNR, Inst Radioastron, I-40129 Bologna, Italy. Netherlands Fdn Res Astron, NL-7990 AA Dwingeloo, Netherlands. Univ Sheffield, Sheffield S10 2TN, S Yorkshire, England. RP Labiano, A (reprint author), Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA. OI capetti, alessandro/0000-0003-3684-4275; Koekemoer, Anton/0000-0002-6610-2048 NR 12 TC 2 Z9 2 U1 0 U2 1 PU C S I R O PUBLISHING PI COLLINGWOOD PA 150 OXFORD ST, PO BOX 1139, COLLINGWOOD, VICTORIA 3066, AUSTRALIA SN 1323-3580 J9 PUBL ASTRON SOC AUST JI Publ. Astron. Soc. Aust. PY 2003 VL 20 IS 1 BP 28 EP 30 DI 10.1071/SD02027 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 685RV UT WOS:000183277800009 ER PT J AU O'Dea, CP de Vries, WH Koekemoer, AM Baum, SA Axon, DJ Barthel, PD Capetti, A Fanti, R Gelderman, R Morganti, R Tadhunter, CN AF O'Dea, CP de Vries, WH Koekemoer, AM Baum, SA Axon, DJ Barthel, PD Capetti, A Fanti, R Gelderman, R Morganti, R Tadhunter, CN TI Jet-cloud interactions in compact steep spectrum radio sources SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA LA English DT Article; Proceedings Paper CT 3rd Workshop on Compact Steep Spectrum and Gigahertz-Peaked Spectrum Radio Sources CY MAY 28-31, 2002 CL KERASTARI, GREECE DE galaxies : active; galaxies : jets; galaxies : individual (3C 67, 3C 277.1; 3C 303.1) ID EMISSION-LINE NEBULAE; GALAXIES; REGION; SHOCKS AB We have obtained HST/STIS long slit spectroscopy of the aligned emission line nebulae in three compact steep spectrum (CSS) radio sources - 3C67, 3C 277.1, and 3C 303.1. We find systematic offsets (similar to 300 - 500 km s(-1)) of the emission line velocities on one or both sides of the radio sources. We also see evidence for broad lines (FWHM similar to 500 km s(-1)) and complex emission line profiles. In 3C 303.1 the data are consistent with multiple components and possibly split lines. The amplitude of the velocity variations is not so large as to exclude gravitationally-induced motions. However, the complex kinematics, the lack of a signature of Keplerian rotation, and the association of the velocity variations with the radio lobes are consistent with the observed similar to 300-500 km s(-1) velocities being driven by the expansion of the radio source. Acceleration of the clouds by the bow shock is plausible given the estimated densities in the clouds and the velocities observed in the much smaller compact symmetric objects and with expansion velocities estimated from spectral ageing. This conclusion is unchanged if we consider the scenario in which the cloud acceleration is dominated by the post bow shock flow. C1 Space Telescope Sci Inst, Baltimore, MD 21218 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Hertfordshire, Hatfield AL10 9AB, Herts, England. Univ Groningen, Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands. Osserv Astron Torino, I-10025 Pino Torinese, TO, Italy. CNR, Inst Radioastron, I-40129 Bologna, Italy. Western Kentucky Univ, Bowling Green, KY 42101 USA. Netherlands Fdn Res Astron, NL-7990 AA Dwingeloo, Netherlands. Univ Sheffield, Sheffield S10 2TN, S Yorkshire, England. RP O'Dea, CP (reprint author), Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA. EM odea@stsci.edu; wdevries@igpp.ucllnl.org; koekemoe@stsci.edu; sbaum@stsci.edu; dja@star.herts.ac.uk; pdb@astro.rug.nl; capetti@to.astro.it; rfanti@ira.bo.cnr.it; gelderman@wku.edu; morganti@nfra.nl; C.Tadhunter@sheffield.ac.uk OI Gelderman, Richard/0000-0001-8962-0801; capetti, alessandro/0000-0003-3684-4275; Koekemoer, Anton/0000-0002-6610-2048 NR 13 TC 13 Z9 13 U1 0 U2 1 PU C S I R O PUBLISHING PI COLLINGWOOD PA 150 OXFORD ST, PO BOX 1139, COLLINGWOOD, VICTORIA 3066, AUSTRALIA SN 1323-3580 J9 PUBL ASTRON SOC AUST JI Publ. Astron. Soc. Aust. PY 2003 VL 20 IS 1 BP 88 EP 93 DI 10.1071/AS03006 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 685RV UT WOS:000183277800023 ER PT J AU Akerlof, CW Kehoe, RL McKay, RA Rykoff, ES Smith, DA Casperson, DE McGowan, KE Vestrand, WT Wozniak, PR Wren, JA Ashley, MCB Phillips, MA Marshall, SL Epps, HW Schier, JA AF Akerlof, CW Kehoe, RL McKay, RA Rykoff, ES Smith, DA Casperson, DE McGowan, KE Vestrand, WT Wozniak, PR Wren, JA Ashley, MCB Phillips, MA Marshall, SL Epps, HW Schier, JA TI The ROTSE-III robotic telescope system SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC LA English DT Article ID GAMMA-RAY BURSTS; COUNTERPART SEARCH EXPERIMENT; PROGRAM AB The observation of a prompt optical flash from GRB 990123 convincingly demonstrated the value of autonomous robotic telescope systems. Pursuing a program of rapid follow-up observations of gamma-ray bursts, the Robotic Optical Transient Search Experiment (ROTSE) has developed a next-generation instrument, ROTSE-III, that will continue the search for fast optical transients. The entire system was designed as an economical robotic facility to be installed at remote sites throughout the world. There are seven major system components: optics, optical tube assembly, CCD camera, telescope mount, enclosure, environmental sensing and protection, and data acquisition. Each is described in turn in the hope that the techniques developed here will be useful in similar contexts elsewhere. C1 Univ Michigan, Dept Phys, Randall Lab 2477, Ann Arbor, MI 48109 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ New S Wales, Dept Astrophys & Opt, Sch Phys, Sydney, NSW 2052, Australia. Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Univ Calif Santa Cruz, Lick Observ, Santa Cruz, CA 95064 USA. Pilot Grp, Monrovia, CA 91016 USA. Michigan State Univ, E Lansing, MI 48824 USA. RP Akerlof, CW (reprint author), Univ Michigan, Dept Phys, Randall Lab 2477, Ann Arbor, MI 48109 USA. NR 20 TC 129 Z9 131 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 1427 E 60TH ST, CHICAGO, IL 60637-2954 USA SN 0004-6280 J9 PUBL ASTRON SOC PAC JI Publ. Astron. Soc. Pac. PD JAN PY 2003 VL 115 IS 803 BP 132 EP 140 DI 10.1086/345490 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA 628MW UT WOS:000180000300013 ER PT B AU Moreland, K Thompson, D AF Moreland, K Thompson, D BE Koning, A Machiraju, R Silva, CT TI From cluster to wall with VTK SO PVG 2003 PROCEEDINGS LA English DT Proceedings Paper CT IEEE Symposium on Parallel and Large-Data Visualization and Graphics CY OCT 20-21, 2003 CL SEATTLE, WA SP IEEE Comp Soc, TC Visual & Graph, ACM SIGGRAPH DE parallel rendering; desktop delivery; tile display; PC cluster; Chromium; VTK AB This paper describes a new set of parallel rendering components for VTK, the Visualization Toolkit. The parallel rendering units allow for the rendering of vast quantities of geometry with a focus on cluster computers. Furthermore, the geometry may be displayed on tiled displays at full or reduced resolution. We demonstrate an interactive VTK application processing an isosurface consisting of nearly half a billion triangles and displaying on a power wall with a total resolution of 63 million pixels. We also demonstrate an interactive VTK application displaying the same geometry on a desktop connected to the cluster via a TCP/IP socket over 100BASE-T Ethernet. C1 Sandia Natl Labs, Livermore, CA 94550 USA. RP Sandia Natl Labs, Livermore, CA 94550 USA. EM kmorel@sandia.gov; dcthomp@sandia.gov NR 10 TC 8 Z9 8 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8122-X PY 2003 BP 25 EP 31 DI 10.1109/PVGS.2003.1249039 PG 7 WC Computer Science, Information Systems; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BX88B UT WOS:000186710400004 ER PT B AU LaMar, E Pascucci, V AF LaMar, E Pascucci, V BE Koning, A Machiraju, R Silva, CT TI Multi-layered image cache for scientific visualization SO PVG 2003 PROCEEDINGS LA English DT Proceedings Paper CT IEEE Symposium on Parallel and Large-Data Visualization and Graphics CY OCT 20-21, 2003 CL SEATTLE, WA SP IEEE Comp Soc, TC Visual & Graph, ACM SIGGRAPH DE image cache; impostors; scientific visualization; multiresolution techniques; hierarchical techniques; parallel techniques AB We introduce a multi-layered image cache system that is designed to work with a pool of rendering engines to facilitate a frame-less, asynchronous rendering environment for scientific visualization. Our system decouples the rendering from the display of imagery at many levels; it decouples render frequency and resolution from display frequency and resolution; allows asynchronous transmission of imagery instead of the compute-send cycle of standard parallel systems; and allows local, incremental refinement of imagery without requiring all imagery to be re-rendered. Interactivity is accomplished by maintaining a set of image tiles for display while the production of imagery is performed by a pool of processors. The image tiles are placed in fixed places in camera (vs. world) space to eliminate occlusion artifacts. Display quality is improved by increasing the number of image tiles and imagery is refreshed more frequently by decreasing the number of image tiles. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP LaMar, E (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. EM eclamar@comcast.net; pascucci@llnl.gov NR 16 TC 7 Z9 7 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8122-X PY 2003 BP 61 EP 67 PG 7 WC Computer Science, Information Systems; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BX88B UT WOS:000186710400008 ER PT B AU D'Helon, C Protopopescu, V AF D'Helon, C Protopopescu, V BE Shapiro, JH Hirota, O TI New summing algorithm using ensemble computing SO QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING, PROCEEDINGS LA English DT Proceedings Paper CT 6th International Conference on Quantum Communication, Measurement and Computing (QCMC 02) CY JUL 22-26, 2002 CL MIT, CAMBRIDGE, MA HO MIT ID SPIN LIOUVILLE SPACE; QUANTUM AB We propose an ensemble algorithm that provides a new approach for summing up a set of function samples. The query complexity of the algorithm depends only on the scaling of the measurement sensitivity with the number of distinct spin sub-ensembles. Prom a practical point of view, the proposed algorithm may result in an exponential speedup, compared to known quantum and classical summing algorithms. C1 Oak Ridge Natl Lab, Ctr Engn Sci Adv Res, Comp Sci & Math Div, Oak Ridge, TN 37831 USA. RP D'Helon, C (reprint author), Oak Ridge Natl Lab, Ctr Engn Sci Adv Res, Comp Sci & Math Div, Oak Ridge, TN 37831 USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU RINTON PRESS, INC PI PRINCETON PA 565 EDMUND TERRACE, PRINCETON, NJ 07652 USA BN 1-58949-030-4 PY 2003 BP 438 EP 440 PG 3 WC Computer Science, Theory & Methods; Instruments & Instrumentation; Optics; Physics, Particles & Fields SC Computer Science; Instruments & Instrumentation; Optics; Physics GA BW77P UT WOS:000183135800093 ER PT B AU Protopopescu, V Perez, RB D'Helon, C Schmulen, J AF Protopopescu, V Perez, RB D'Helon, C Schmulen, J BE Shapiro, JH Hirota, O TI Robust control of decoherence in realistic one-qubit quantum gates SO QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING, PROCEEDINGS LA English DT Proceedings Paper CT 6th International Conference on Quantum Communication, Measurement and Computing (QCMC 02) CY JUL 22-26, 2002 CL MIT, CAMBRIDGE, MA HO MIT ID DISSIPATION AB We present an open loop (bang-bang) scheme to control decoherence in a generic one-qubit quantum gate and implement it in a realistic simulation. The system is consistently described within the spin-boson model, with interactions accounting for both adiabatic and thermal decoherence. The external control is included from the beginning in the Hamiltonian as an independent interaction term. After tracing out the environment modes, reduced equations are obtained for the two-level system in which the effects of both decoherence and external control appear explicitly. The controls are determined exactly from the condition to eliminate decoherence, i.e., to restore unitarity. Numerical simulations show excellent performance and robustness of the, proposed control scheme. C1 Oak Ridge Natl Lab, Ctr Engn Sci Adv Res, Div Math & Comp Sci, Oak Ridge, TN 37831 USA. RP Protopopescu, V (reprint author), Oak Ridge Natl Lab, Ctr Engn Sci Adv Res, Div Math & Comp Sci, Oak Ridge, TN 37831 USA. NR 12 TC 0 Z9 0 U1 0 U2 1 PU RINTON PRESS, INC PI PRINCETON PA 565 EDMUND TERRACE, PRINCETON, NJ 07652 USA BN 1-58949-030-4 PY 2003 BP 460 EP 462 PG 3 WC Computer Science, Theory & Methods; Instruments & Instrumentation; Optics; Physics, Particles & Fields SC Computer Science; Instruments & Instrumentation; Optics; Physics GA BW77P UT WOS:000183135800099 ER PT S AU Jellison, GE Withrow, SP Jaiswal, S Rouleau, CM Simpson, RT White, CW Griffiths, CO AF Jellison, GE Withrow, SP Jaiswal, S Rouleau, CM Simpson, RT White, CW Griffiths, CO BE Kilmov, VI Buriak, JM Wayner, DDM Priolo, F White, B Tsybeskov, L TI Spectroscopic ellipsometry studies of nanocrystalline silicon in thin-film silicon dioxide SO QUANTUM CONFINED SEMICONDUCTOR NANOSTRUCTURES SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Quantum Confined Semiconductor Nanostructures held at the 2002 MRS Fall Meeting CY DEC 02, 2001-DEC 05, 2002 CL BOSTON, MA SP Mat Res Soc, Evident Technol Inc, IBM TJ Watson Res Ctr, Los Alamos Natl Lab, Motorola Inc, Texas A&M Univ ID OPTICAL FUNCTIONS; GAIN AB Nanocrystalline silicon (n-Si) is formed in a silicon dioxide thin-film matrix by ion implantation followed by thermal annealing in forming gas at 1100 degreesC for I hour. The ion implantation is performed using multiple implants with different implantation energies and doses to create a quasi-flat concentration of silicon atoms throughout the silicon dioxide film. These samples are then analyzed using spectroscopic ellipsometry to characterize their linear optical properties. Implantations with small doses (5 x 10(20) Si atoms/cm(3)) increase the refractive index by a small amount (Deltansimilar to0.006 at 600nm), while implantations with moderate dose (5 x 10(21) Si atoms/cm(3)) have a larger increase in refractive index and exhibit optical absorption above similar to1.9 eV (650 nm). C1 Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA. RP Jellison, GE (reprint author), Oak Ridge Natl Lab, Condensed Matter Sci Div, POB 2008, Oak Ridge, TN 37831 USA. RI Rouleau, Christopher/Q-2737-2015 OI Rouleau, Christopher/0000-0002-5488-3537 NR 12 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-674-5 J9 MATER RES SOC SYMP P PY 2003 VL 737 BP 259 EP 264 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Optics; Physics, Condensed Matter SC Engineering; Materials Science; Optics; Physics GA BW77S UT WOS:000183136600037 ER PT J AU Nilsen, J AF Nilsen, J TI Reminiscing about the early years of the X-ray laser SO QUANTUM ELECTRONICS LA English DT Article DE X-ray laser; laser plasma; highly charged ions AB To put the development of the X-ray laser in historic context, this paper presents some of the motivation and history of the development of the X-ray laser from the perspective of a scientist at the Lawrence Livermore National Laboratory where the first X-ray laser was demonstrated in the early 1980s using a nuclear device as the driver. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Nilsen, J (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 10 TC 4 Z9 4 U1 0 U2 0 PU TURPION LTD PI LETCHWORTH PA TURPIN DISTRIBUTION SERVICES, BLACKHORSE RD, LETCHWORTH SG6 1HN, HERTS, ENGLAND SN 1063-7818 J9 QUANTUM ELECTRON+ JI Quantum Electron. PD JAN PY 2003 VL 33 IS 1 BP 1 EP 2 DI 10.1070/QE2003v033n01ABEH002356 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA 670GG UT WOS:000182398700001 ER PT S AU Somma, R Ortiz, G Knill, E Gubernatis, J AF Somma, R Ortiz, G Knill, E Gubernatis, J BE Donkor, E Pirich, AR Brandt, HE TI Quantum simulations of physics problems SO QUANTUM INFORMATION AND COMPUTATION SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Quantum Information and Computation CY APR 21-22, 2003 CL ORLANDO, FL SP SPIE DE quantum mechanics; quantum computing; identical particles; spin systems; generalized Jordan-Wigner transformation AB If a large Quantum Computer (QC) existed today, what type of physical problems could we efficiently simulate on it that we could not simulate on a classical Turing machine? In this paper we argue that a QC could solve some relevant physical "questions" more efficiently. The existence of one-to-one mappings between different algebras of observables or between different Hilbert spaces allow us to represent and imitate any physical system by any other one (e.g., a bosonic system by a spin-1/2 system). We explain how these mappings can be performed showing quantum networks useful for the efficient evaluation of some physical properties, such as correlation functions and energy spectra. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Somma, R (reprint author), Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 8 TC 4 Z9 4 U1 1 U2 3 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-4965-2 J9 P SOC PHOTO-OPT INS PY 2003 VL 5105 BP 96 EP 103 DI 10.1117/12.487249 PG 8 WC Computer Science, Theory & Methods SC Computer Science GA BX48L UT WOS:000185395800011 ER PT S AU Schultz, JF Taubman, MS Harper, WW Williams, RM Myers, TL Cannon, BD Sheen, DM Anheier, NC Allen, PJ Sundaram, SK Johnson, BR Aker, PM Wu, MC Lau, EK AF Schultz, JF Taubman, MS Harper, WW Williams, RM Myers, TL Cannon, BD Sheen, DM Anheier, NC Allen, PJ Sundaram, SK Johnson, BR Aker, PM Wu, MC Lau, EK BE Razeghi, M Brown, GJ TI Quantum cascade transmitters for ultra-sensitive chemical agent and explosives detection SO QUANTUM SENSING: EVOLUTION AND REVOLUTION FROM PAST TO FUTURE SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Quantum Sensing - Evolution and Revolution from Past to Future CY JAN 27-30, 2003 CL SAN JOSE, CA SP SPIE DE quantum-cascade lasers; chemical sensing; frequency modulation lidar; cavity-enhanced sensor; integrated optics ID FREQUENCY-MODULATION SPECTROSCOPY; LASERS; STABILIZATION; GLASSES AB The small size, high power, promise of access to any wavelength between 3.5 and 16 microns, substantial tuning range about a chosen center wavelength, and general robustness of quantum cascade (QC) lasers provide opportunities for new approaches to ultra-sensitive chemical detection and other applications in the mid-wave infrared. PNNL is developing novel remote and sampling chemical sensing systems based on QC lasers, using QC lasers loaned by Lucent Technologies. In recent months laboratory cavity-enhanced sensing experiments have achieved absorption sensitivities of 8.5 x 10(-11) cm(-1) Hz(-1/2), and the PNNL team has begun monostatic and bi-static frequency modulated, differential absorption lidar (FM DIAL) experiments at ranges of,up to 2.5 kilometers. In related work, PNNL and UCLA are developing miniature QC laser transmitters with the multiplexed tunable wavelengths, frequency and amplitude stability, modulation characteristics, and power levels needed for chemical sensing and other applications. Current miniaturization concepts envision coupling QC oscillators, QC amplifiers, frequency references, and detectors with miniature waveguides and waveguide-based modulators, isolators, and other devices formed from chalcogenide or other types of glass. Significant progress has been made on QC laser stabilization and amplification, and on development and characterization of high-purity chalcogenide glasses, waveguide writing techniques, and waveguide metrology. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Schultz, JF (reprint author), Pacific NW Natl Lab, POB 999, Richland, WA 99352 USA. NR 17 TC 4 Z9 4 U1 1 U2 1 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-4799-4 J9 P SOC PHOTO-OPT INS PY 2003 VL 4999 BP 1 EP 18 DI 10.1117/12.485542 PG 18 WC Engineering, Electrical & Electronic; Instruments & Instrumentation; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Instruments & Instrumentation; Materials Science; Physics GA BX22U UT WOS:000184696000001 ER PT J AU Mena, F Reyes, O Stafford, TW Southon, J AF Mena, F Reyes, O Stafford, TW Southon, J TI Early human remains from Bano Nuevo-1 cave, central Patagonian Andes, Chile SO QUATERNARY INTERNATIONAL LA English DT Article; Proceedings Paper CT Meeting on the Archaeology of the Pleistocene/Holocene Transition CY DEC, 2000 CL ARGENTINA ID REVISED METHOD; LONG BONES; RADIOCARBON; AGE; ACCURACY; STATURE; BURIAL; DEATH; C-14 AB The notable sparseness of human skeletal remains is a characteristic trait of early American prehistory and, therefore, this aspect of the archaeological record is seldom considered in its discussion. In this context, the finding of remains from five individuals dated to the 9th millenium BP on the re-excavations at Bano Nuevo Cave (Andean Central Patagonia, Chile) is particularly interesting. They may not appear excessively old, but several radiocarbon dates (two of them done through AMS directly on the bone of one of the individuals) place them among the very few well-dated early human skeletons throughout the Americas. The small sample size militates against any interpretation of biological affiliation (to say nothing of population movements) and we can only affirm that these people belonged to a generalized "mongoloid stock", different from historically known Patagonian populations. After a brief presentation of the skeletal evidence and the bone dating methods, we evaluate the relevance of this context with respect to the sparse osteological record of humans in the Americas on the Pleistocene/Holocene transition. (C) 2003 Elsevier Ltd and INQUA. All rights reserved. C1 Museo Chileno Arte Precolombino, Santiago 361, Chile. Stafford Res Labs Inc, Boulder, CO 80301 USA. Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94451 USA. RP Mena, F (reprint author), Museo Chileno Arte Precolombino, Bandera, Santiago 361, Chile. EM fmena@museoprecolombino.cl; omarreyesbaez@vtr.net NR 53 TC 13 Z9 19 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1040-6182 J9 QUATERN INT JI Quat. Int. PY 2003 VL 109 BP 113 EP 121 AR PII S1040-6182(02)00207-0 DI 10.1016/S1040-6182(02)00207-0 PG 9 WC Geography, Physical; Geosciences, Multidisciplinary SC Physical Geography; Geology GA 707HR UT WOS:000184505700011 ER PT J AU Bridges, F Baumbach, R Cao, D Chesler, P Anderson, M Sales, B AF Bridges, F Baumbach, R Cao, D Chesler, P Anderson, M Sales, B TI Probing phonon scattering sites in the thermoelectric clathrate Eu8Ga16Ge30 SO RADIATION EFFECTS AND DEFECTS IN SOLIDS LA English DT Article; Proceedings Paper CT 9th Europhysical Conference on Defects in Insulating Materials CY JUL 01-05, 2002 CL WROCLAW, POLAND SP Wroclaw Univ Technol DE clathrate; XAFS; thermoelectric; rattler; Eu8Ga16Ge30; Sr8Ga16Ge30 ID STRUCTURAL DISORDER AB The low thermal conductivity of the Thermoelectric Clathrates Eu8Ga16Ge30 and Sr8Ga16Ge30 has been attributed to rattling atoms (Eu or Sr) in the Eu2/Sr2 sites. The low Einstein temperature obtained using XAFS for the nearest neighbor Eu-Ga/Ge bonds at the Eu2 sites is consistent with the model. However, the comparable Einstein temperature for the Eu1 site indicates that Eu1 is also a rattler. The fit also confirms that the Eu2 is displaced along either the y or z axis similar to 0.45Angstrom in agreement with neutron diffraction. C1 Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA. Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Bridges, F (reprint author), Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA. RI Baumbach, Ryan/C-5528-2012 NR 4 TC 3 Z9 3 U1 0 U2 2 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 1042-0150 J9 RADIAT EFF DEFECT S JI Radiat. Eff. Defects Solids PD JAN-JUN PY 2003 VL 158 IS 1-6 BP 343 EP 347 DI 10.1080/1042015021000051954 PG 5 WC Nuclear Science & Technology; Physics, Fluids & Plasmas; Physics, Condensed Matter SC Nuclear Science & Technology; Physics GA 675EA UT WOS:000182679000057 ER PT J AU Schwartz, RB McDonald, JC AF Schwartz, RB McDonald, JC TI On the interpretation and use of neutron calibration coefficients SO RADIATION PROTECTION DOSIMETRY LA English DT Article AB Calibration laboratories provide measurement services that include determining the calibration coefficients for neutron survey meters and personal dosemeters. While there are numerous documents dealing with the procedures for calibration of neutron measuring devices. the purpose of this paper is to clarify the use of the particular dose equivalent conversion coefficients used at the National Institute of Standards and Technology and the Pacific Northwest National Laboratory for these calibrations. C1 Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. Pacific NW Natl Lab, Richland, WA 99352 USA. RP Schwartz, RB (reprint author), Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. EM joe.mcdonald@pnl.gov NR 12 TC 1 Z9 1 U1 0 U2 0 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 2003 VL 107 IS 4 BP 277 EP 279 PG 3 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 764BA UT WOS:000188169100010 PM 14756185 ER PT J AU Leggett, RW AF Leggett, RW TI Reliability of the ICRP'S dose coefficients for members of the public. III. Plutonium as a case study of uncertainties in the systemic biokinetics of radionuclides SO RADIATION PROTECTION DOSIMETRY LA English DT Article ID URINARY-EXCRETION; UNITED-STATES; MODEL; METABOLISM; ASSOCIATION; ABSORPTION; AMERICIUM; DOSIMETRY; RETENTION; REGISTRY AB This paper is a case study of the validity of different data sources and modelling approaches commonly used to build biokinetic models for radionuclides. The paper examines the basis and apparent predictive accuracy of each of the biokinetic models for Pu used over the years by the International Commission on Radiological Protection (ICRP), in view of recent improvements in the database. The results of this study and similar retrospective studies for other elements suggest the following five points. (1) Extrapolation of biokinetic data from laboratory animals to man is particularly uncertain for the liver due to qualitative differences among species in the handling of many elements by this organ. (2) As a 'default' approach to biokinetic modelling or model assessment, biokinetic data for unhealthy human subjects should be given higher weight than information extrapolated across animal species or chemical families, but there are counter-examples. (3) Little confidence can be placed in biokinetic model predictions for long times after exposure based solely on curve fits to short-term biokinetic data. (4) Bioassay and dosimetry models for a radionuclide should not be developed separately. (5) Where feasible, the systemic biokinetic model for a radionuclide should be developed within a physiologically realistic model structure, because this allows biokinetic data from experimental studies to be supplemented with physiological information, provides a basis for extrapolation of data across animals species or chemical families. results in models that can be used for both bioassay interpretation and dosimetry, and provides a logical basis for extrapolation of data to subgroups of the populatuion (e.g., various ages) or to times outside the period of observation. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Leggett, RW (reprint author), Oak Ridge Natl Lab, 1060 Commerce Pk, Oak Ridge, TN 37831 USA. NR 50 TC 20 Z9 20 U1 0 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD TN23 1YW, KENT, ENGLAND SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 2003 VL 106 IS 2 BP 103 EP 120 PG 18 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 745TF UT WOS:000186703600002 PM 14653331 ER PT J AU Bailey, MR Ansoborlo, E Guilmette, RA Paquet, F AF Bailey, MR Ansoborlo, E Guilmette, RA Paquet, F TI Practical application of the ICRP human respiratory tract model SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT Workshop on Internal Dosimetry of Radionuclides CY SEP 09-12, 2002 CL NEW COLL, OXFORD, ENGLAND SP Natl Radiol Protect Board, Inst Radioprotect & Surete Nucl, European Radiat Dosimetry Grp, European Late Effects Project Grp, European Commiss, Res Directorate Gen, Biol & Environm Res Program, USA DOE, WHO HO NEW COLL ID INHALED (PUO2)-PU-239; LUNG; PARTICLES; RETENTION AB The ICRP Publication 66 Human Respiratory Tract Model (HRTM) has been applied to calculate dose coefficients and bioassay functions using default values of parameters relating to the material and the Subjects. The ICRP Task Group on Internal Dosimetry (INDOS) has developed a guidance document on application of the HRTM in situations where using specific information can improve dose assessments. INDOS is now revising the worker exposure documents (ICRP Publications 68 and 78). Application of the HRTM requires a review of the lung-to-blood absorption characteristics of inhaled radionuclides. Where appropriate. compound-specific absorption parameter values will be derived. and other compounds will be assigned to default Types using current information. Although no major changes to the HRTM are envisaged, this revision provides an opportunity for some refining and updating in the light of experience and new information. C1 Natl Radiol Protect Board, Didcot OX11 0RQ, Oxon, England. CEA, DEN, DRCP, CETAMA,VRH Marcoule, F-30207 Bagnols Sur Ceze, France. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. IRSN, DPHD, SDOS, LEAR, F-26702 Pierrelatte, France. RP Bailey, MR (reprint author), Natl Radiol Protect Board, Didcot OX11 0RQ, Oxon, England. RI Eric, Ansoborlo/N-1809-2015 OI Eric, Ansoborlo/0000-0003-0523-3738 NR 17 TC 6 Z9 6 U1 0 U2 3 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD TN23 1YW, KENT, ENGLAND SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 2003 VL 105 IS 1-4 BP 71 EP 76 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 725FM UT WOS:000185533200012 PM 14526930 ER PT J AU Hahn, FF Romanov, SA Guilmette, RA Nifatov, AP Zaytseva, YV Diel, JH Allen, SW Lyovkina, YV AF Hahn, FF Romanov, SA Guilmette, RA Nifatov, AP Zaytseva, YV Diel, JH Allen, SW Lyovkina, YV TI Distribution of plutonium particles in the lungs of Mayak workers SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT Workshop on Internal Dosimetry of Radionuclides CY SEP 09-12, 2002 CL NEW COLL, OXFORD, ENGLAND SP Natl Radiol Protect Board, Inst Radioprotect & Surete Nucl, European Radiat Dosimetry Grp, European Late Effects Project Grp, European Commiss, Res Directorate Gen, Biol & Environm Res Program, USA DOE, WHO HO NEW COLL ID INHALED (PUO2)-PU-239; DOGS; RATS AB Lung tissues from workers at the Mayak Production Association were examined to determine the distribution of plutonium (Pu) activity in various lung compartments. Stereological sampling methods and auto radiography were used. Pu particles were identified by microscopic examination of autoradiographs and localised in one of six normal anatomic sites and two sites of fibrosis (parenchymal, non-parenchymal). Particle activity was determined by counting the number of tracks emanating from the particles. Over 50% of the Pu activity was localised in sites of fibrosis, which had significantly higher than average activity for the lung. Over 40% of the activity was in lung parenchyma. Activity in the bronchovascular interstitium was significantly lower than average. These results support the hypothesis that Pu activity is not uniformly distributed in the lung, with long-term retained particles concentrated in scars of the lung. The results may significantly affect estimates of dose from inhaled Pu. C1 Lovelace Resp Res Inst, Albuquerque, NM 87108 USA. So Urals Biophys Inst, Ozyorsk 456780, Chelyabinsk Reg, Russia. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Hahn, FF (reprint author), Lovelace Resp Res Inst, 2425 Ridgecrest Dr SE, Albuquerque, NM 87108 USA. NR 11 TC 9 Z9 10 U1 0 U2 2 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD TN23 1YW, KENT, ENGLAND SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 2003 VL 105 IS 1-4 BP 81 EP 84 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 725FM UT WOS:000185533200014 PM 14526932 ER PT J AU Romanov, SA Guilmette, RA Hahn, FF Nifatov, AP Zaytseva, YV Lyovkina, YV AF Romanov, SA Guilmette, RA Hahn, FF Nifatov, AP Zaytseva, YV Lyovkina, YV TI Modifying the ICRP 66 dosimetry model based on results obtained from Mayak plutonium workers SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT Workshop on Internal Dosimetry of Radionuclides CY SEP 09-12, 2002 CL NEW COLL, OXFORD, ENGLAND SP Natl Radiol Protect Board, Inst Radioprotect & Surete Nucl, European Radiat Dosimetry Grp, European Late Effects Project Grp, European Commiss, Res Directorate Gen, Biol & Environm Res Program, USA DOE, WHO HO NEW COLL ID LUNG; RADIATION; EXPOSURE AB Results obtained in a study of the microscopic distribution of plutonium in the lungs of deceased Pu workers from the Mayak Production Association showed that the long-term retention of Pu was greater than predicted by the current ICRP 66 respiratory tract dosimetry model (HRTM). These data were therefore applied to the HRTM by modifying selected parameters, namely the transfer rate of Pu from the transformed state compartment and the fraction of Pu that transfers to the bound state compartment. Invoking the latter compartment into the modelling allowed a better representation of the long-term Pu retention as well as providing a convenient means of describing the workplace-specific characteristics of the different Pu aerosols found in the Mayak plant. In particular, the present model describes a significantly greater long-term retention of Pu nitrate aerosols in the lung compared with the Type M default. C1 So Urals Biophys Inst, Ozyorsk 456780, Chelyabinsk Reg, Russia. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Lovelace Resp Res Inst, Albuquerque, NM 87108 USA. RP Romanov, SA (reprint author), So Urals Biophys Inst, Ozyorsk Rd 19, Ozyorsk 456780, Chelyabinsk Reg, Russia. NR 13 TC 7 Z9 7 U1 0 U2 2 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD TN23 1YW, KENT, ENGLAND SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 2003 VL 105 IS 1-4 BP 85 EP 90 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 725FM UT WOS:000185533200015 PM 14526933 ER PT J AU Carbaugh, EH La Bone, TR AF Carbaugh, EH La Bone, TR TI Two case studies of highly insoluble plutonium inhalation with implications for bioassay SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT Workshop on Internal Dosimetry of Radionuclides CY SEP 09-12, 2002 CL NEW COLL, OXFORD, ENGLAND SP Natl Radiol Protect Board, Inst Radioprotect & Surete Nucl, European Radiat Dosimetry Grp, European Late Effects Project Grp, European Commiss, Res Directorate Gen, Biol & Environm Res Program, USA DOE, WHO HO NEW COLL AB Two well characterised Pu inhalation cases show some remarkable similarities between substantially different types of Pu oxide. The circumstances of exposure, therapy, bioassay data, chemical solubility studies and dosimetry associated with these cases suggest that highly insoluble Pu may be more common than previously thought, and can pose Significant challenges to bioassay programmes. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. Westinghouse Savannah River Co, Aiken, SC 29808 USA. RP Carbaugh, EH (reprint author), Pacific NW Natl Lab, POB 999,MSIN P7-01, Richland, WA 99352 USA. NR 7 TC 10 Z9 11 U1 0 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD TN23 1YW, KENT, ENGLAND SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 2003 VL 105 IS 1-4 BP 133 EP 138 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 725FM UT WOS:000185533200025 PM 14526943 ER PT J AU Parkhurst, MA AF Parkhurst, MA TI Measuring aerosols generated inside armoured vehicles perforated by depleted uranium ammunition SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT Workshop on Internal Dosimetry of Radionuclides CY SEP 09-12, 2002 CL NEW COLL, OXFORD, ENGLAND SP Natl Radiol Protect Board, Inst Radioprotect & Surete Nucl, European Radiat Dosimetry Grp, European Late Effects Project Grp, European Commiss, Res Directorate Gen, Biol & Environm Res Program, USA DOE, WHO HO NEW COLL AB In response to questions raised after the Gulf War about the health significance of exposure to depleted uranium (DU), the US Department of Defense initiated a study designed to provide an improved scientific basis for assessment of possible health effects on soldiers in vehicles struck by these munitions. As part of this study, a series of DU penetrators were fired at an Abrams tank and a Bradley fighting vehicle, and the aerosols generated by vehicle perforation were collected and characterised. A robust sampling system was designed to collect aerosols in this difficult environment and monitor continuously the sampler flow rates. The aerosol samplers selected for these tests included filter cassettes, cascade impactors, a five-stage cyclone and a moving filter. Sampler redundancy was an integral part of the sampling system to offset losses from fragment damage. Wipe surveys and deposition trays collected removable deposited particulate matter. Interior aerosols were analysed for uranium concentration and particle size distribution as a function of time. They were also analysed for uranium oxide phases, particle morphology and dissolution in vitro. These data, currently under independent peer review, will provide input for future prospective and retrospective dose and health risk assessments of inhaled or ingested DU aerosols. This paper briefly discusses the target vehicles, firing trajectories, aerosol samplers and instrumentation control systems, and the types of analyses conducted on the samples. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Parkhurst, MA (reprint author), Pacific NW Natl Lab, POB 999, Richland, WA 99352 USA. NR 2 TC 11 Z9 11 U1 0 U2 6 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD TN23 1YW, KENT, ENGLAND SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 2003 VL 105 IS 1-4 BP 167 EP 170 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 725FM UT WOS:000185533200032 PM 14526950 ER PT J AU Toohey, RE AF Toohey, RE TI Excretion of depleted uranium by Gulf War veterans SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT Workshop on Internal Dosimetry of Radionuclides CY SEP 09-12, 2002 CL NEW COLL, OXFORD, ENGLAND SP Natl Radiol Protect Board, Inst Radioprotect & Surete Nucl, European Radiat Dosimetry Grp, European Late Effects Project Grp, European Commiss, Res Directorate Gen, Biol & Environm Res Program, USA DOE, WHO HO NEW COLL AB During the Persian Gulf War, in 1991, approximately I no US military personnel had potential intakes of depleted uranium (DU), including shrapnel wounds. In 1993, the US government initiated a follow-up study of 33 Gulf War veterans who had been exposed to DU, many of whom contained embedded fragments of DU shrapnel in their bodies. The veterans underwent medical evaluation, whole-body counting, and urinalysis for uranium by kinetic phosphorescence analysis (KPA). Data are available from seven individuals who exceeded the detection limit for whole-body counting and also had elevated urinary uranium. Urinary excretion rates, in mug U g(-1) creatinine, were determined in 1997 and 1999. The body contents, in mg DU, were determined in 1997; it is assumed there were no significant decreases in total body content in the interim. For the 1997 data, the mean fractional excretion was (2.4 +/- 2.8) x 10(-5) g(-1) creatinine, and for the 1999 data, the mean was (1.1 +/- 0.6) x 10(-5) g(-1) creatinine. However, these means are not significantly different, nor is there any correlation of excretion rate with body content. Thus, human data available to date do not provide any basis for determining the effects of particle surface area, composition and solubility, and biological processes such as encapsulation, on the excretion rate. C1 Oak Ridge Inst Sci & Educ, Oak Ridge, TN 37830 USA. RP Toohey, RE (reprint author), Oak Ridge Inst Sci & Educ, Oak Ridge, TN 37830 USA. NR 11 TC 9 Z9 9 U1 0 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD TN23 1YW, KENT, ENGLAND SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 2003 VL 105 IS 1-4 BP 171 EP 174 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 725FM UT WOS:000185533200033 PM 14526951 ER PT J AU Taylor, DM Leggett, RW AF Taylor, DM Leggett, RW TI A generic biokinetic model for predicting the behaviour of the lanthanide elements in the human body SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT Workshop on Internal Dosimetry of Radionuclides CY SEP 09-12, 2002 CL NEW COLL, OXFORD, ENGLAND SP Natl Radiol Protect Board, Inst Radioprotect & Surete Nucl, European Radiat Dosimetry Grp, European Late Effects Project Grp, European Commiss, Res Directorate Gen, Biol & Environm Res Program, USA DOE, WHO HO NEW COLL ID METABOLISM; INHALATION; PROMETHIUM; RETENTION; SWINE AB Information on the biokinetics of the 15 elements of the lanthanide series, La-57 to Lu-71, is too sparse to permit individual development of meaningful biokinetic models to describe the behaviour of each of the elements in humans. The lanthanides show a regular gradation in chemical properties across the series, and animal studies indicate that this is reflected in regular differences in their deposition in tissues such as the liver and skeleton. These regular differences in chemical and biological behaviour have been utilised to construct a generic lanthanide biokinetic model and to define element-specific parameters for each element in the series. This report describes the use of the available biokinetic data for humans and animals to derive the parameters for each of the elements. C1 Cardiff Univ, Dept Chem, Cardiff CF10 3TB, S Glam, Wales. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Taylor, DM (reprint author), Cardiff Univ, Dept Chem, POB 912, Cardiff CF10 3TB, S Glam, Wales. NR 24 TC 21 Z9 22 U1 2 U2 4 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD TN23 1YW, KENT, ENGLAND SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 2003 VL 105 IS 1-4 BP 193 EP 198 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 725FM UT WOS:000185533200038 PM 14526955 ER PT J AU Guilmette, RA Durbin, PW AF Guilmette, RA Durbin, PW TI Scientific basis for the development of biokinetic models for radionuclide-contaminated wounds SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT Workshop on Internal Dosimetry of Radionuclides CY SEP 09-12, 2002 CL NEW COLL, OXFORD, ENGLAND SP Natl Radiol Protect Board, Inst Radioprotect & Surete Nucl, European Radiat Dosimetry Grp, European Late Effects Project Grp, European Commiss, Res Directorate Gen, Biol & Environm Res Program, USA DOE, WHO HO NEW COLL ID PLUTONIUM; PARTICLES; RAT AB Radionuclide-contaminated wounds are of radiological concern because the wound provides a portal of entry of the radionuclide to the systemic circulation, and can also be a tissue at risk if sufficient dose is deposited at the wound site. Accordingly, a scientific committee established jointly by the US National Council on Radiation Protection and the International Commission on Radiological Protection has been developing an approach to describing the biokinetics of radionuclides deposited in wounds and calculating dose to the wound site. This paper focuses on the analyses, performed principally using experimental animal data, that have led to the development of a biokinetic model for deposited soluble radionuclides as well as more insoluble forms, such as colloids, particles and fragments. The available data for injected soluble materials have provided a basis for categorising 48 different elements (from Be to Cm and representing all of the chemical groups, except halogens and noble gases) into four distinct retention groups. In general, the data are adequate for developing a mechanistically based biokinetic model, whose application is exemplified for soluble radionuclides. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Guilmette, RA (reprint author), Los Alamos Natl Lab, MS-E546,HSR-12, Los Alamos, NM 87545 USA. NR 23 TC 15 Z9 15 U1 0 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD TN23 1YW, KENT, ENGLAND SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 2003 VL 105 IS 1-4 BP 213 EP 218 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 725FM UT WOS:000185533200041 PM 14526958 ER PT J AU Stather, JW Phipps, AW Harrison, JD Eckerman, KF Smith, TJ Fell, TP Nosske, D AF Stather, JW Phipps, AW Harrison, JD Eckerman, KF Smith, TJ Fell, TP Nosske, D TI Dose coefficients for the embryo and fetus following intakes of radionuclides by the mother SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT Workshop on Internal Dosimetry of Radionuclides CY SEP 09-12, 2002 CL NEW COLL, OXFORD, ENGLAND SP Natl Radiol Protect Board, Inst Radioprotect & Surete Nucl, European Radiat Dosimetry Grp, European Late Effects Project Grp, European Commiss, Res Directorate Gen, Biol & Environm Res Program, USA DOE, WHO HO NEW COLL AB The International Commission on Radiological Protection has recently issued Publication 88. giving dose coefficients for the embryo, fetus and newborn child front intakes of selected radionuclides of 31 elements by the mother, either before or during pregnancy. The biokinetic models used for calculating these doses were based upon the available human data and the results of animal experiments. This paper summarises the approach used for the dcvelopment of biokinetic and dosimetric models. It also compares the estimates of dose received by the offspring with those received by the reference adult. The main findings are that, in general, doses to the offspring are similar to or lower than those to the reference adult. For a few radionuclides, however, the dose to the offspring can exceed that to the adult. The reasons for these variations in comparative doses are examined. C1 Natl Radiol Protect Board, Didcot OX11 0RQ, Oxon, England. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Inst Strahlenhyg, Bfs, D-85758 Oberschleissheim, Germany. RP Stather, JW (reprint author), Natl Radiol Protect Board, Didcot OX11 0RQ, Oxon, England. NR 32 TC 2 Z9 3 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD TN23 1YW, KENT, ENGLAND SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 2003 VL 105 IS 1-4 BP 257 EP 264 PG 8 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 725FM UT WOS:000185533200050 PM 14526967 ER PT J AU Berkovski, V Eckerman, KF Phipps, AW Nosske, D AF Berkovski, V Eckerman, KF Phipps, AW Nosske, D TI Dosimetry of radioiodine for embryo and fetus SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT Workshop on Internal Dosimetry of Radionuclides CY SEP 09-12, 2002 CL NEW COLL, OXFORD, ENGLAND SP Natl Radiol Protect Board, Inst Radioprotect & Surete Nucl, European Radiat Dosimetry Grp, European Late Effects Project Grp, European Commiss, Res Directorate Gen, Biol & Environm Res Program, USA DOE, WHO HO NEW COLL ID IODINE AB This paper discusses the biokinetic and dosimetric models adopted in ICRP Publication 88 for the evaluation of fetal doses resulting from maternal intakes of radioiodine. The biokinetic model is used to simulate the behaviour of iodine in both the mother and the fetus. Such Simulations provide the basis for the estimation of the dose to the embryo and determine the distribution of maternal iodine at the beginning of the fetal period. The model considers iodine to accumulate in the fetal thyroid from the 11th week. The dose to the fetus, delivered following birth is evaluated with the biokinetic and dosimetric models described in ICRP Publication 67. Although a substantial fraction of the emitted energy of electrons and photons is less than 10 keV, conventionally assumed to be non-penetrating radiation, these emissions can escape the small fetal thyroid. Absorbed fractions for both self-dose and crossfire were evaluated for the requirements of radioiodine dosimetry in ICRP Publication 88. C1 Radiat Protect Inst, Kiev 050, Ukraine. Oak Ridge Natl Lab, Oak Ridge, TN 37380 USA. Natl Radiol Protect Board, Didcot OX11 0RQ, Oxon, England. Inst Strahlenhyg, Bundesamt Strahlenschutz, D-85764 Oberschleissheim, Germany. RP Berkovski, V (reprint author), Radiat Protect Inst, Melnikova 53, Kiev 050, Ukraine. NR 13 TC 7 Z9 8 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD TN23 1YW, KENT, ENGLAND SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 2003 VL 105 IS 1-4 BP 265 EP 268 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 725FM UT WOS:000185533200051 PM 14526968 ER PT J AU Phipps, AW Harrison, JD Fell, TP Eckerman, KF Nosske, D AF Phipps, AW Harrison, JD Fell, TP Eckerman, KF Nosske, D TI Some aspects of the fetal doses given in ICRP publication 88 SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT Workshop on Internal Dosimetry of Radionuclides CY SEP 09-12, 2002 CL NEW COLL, OXFORD, ENGLAND SP Natl Radiol Protect Board, Inst Radioprotect & Surete Nucl, European Radiat Dosimetry Grp, European Late Effects Project Grp, European Commiss, Res Directorate Gen, Biol & Environm Res Program, USA DOE, WHO HO NEW COLL ID CELLS AB The International Commission on Radiological Protection (ICRP) has recently published dose coefficients (dose per unit intake, Sv Bq(-1)) for the offspring of women exposed to radionuclides during or before pregnancy. These dose estimates include in utero doses to the embryo and fetus and doses delivered postnatally to the newborn child from radionuclides retained at birth. This paper considers the effect on doses of the time of radionuclide intake and examines the proportion of dose delivered in utero and postnatally for different radionuclides. Methods used to calculate doses to the fetal skeleton are compared. For many radionuclides, doses are greatest for intakes early in pregnancy but important exceptions, for which doses are greatest for intakes later in pregnancy, are iodine isotopes and isotopes of the alkaline earth elements, including strontium. While radionuclides such as I-131 deliver dose largely in utero, even for intakes late in pregnancy, others such as Pu-239 deliver dose largely postnatally, even for intakes early during pregnancy. For alpha emitters deposited in the skeleton, the assumption made is of uniform distribution of the radionuclide and of target cells for leukaemia and bone cancer in utero; that is, the developing bone structure is not considered. However, for beta emitters, the bone structure was considered. Both approaches can be regarded as reasonably conservative, given uncertainties in particular in the location of the target cells and the rapid growth and remodelling of the skeleton at this stage of development. C1 Natl Radiol Protect Board, Didcot OX11 0RQ, Oxon, England. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. BfS, Inst Strahlenhyg, D-85758 Oberschleissheim, Germany. RP Phipps, AW (reprint author), Natl Radiol Protect Board, Didcot OX11 0RQ, Oxon, England. NR 17 TC 5 Z9 6 U1 1 U2 2 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD TN23 1YW, KENT, ENGLAND SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 2003 VL 105 IS 1-4 BP 279 EP 284 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA 725FM UT WOS:000185533200054 PM 14526971 ER EF