FN Thomson Reuters Web of Science™ VR 1.0 PT B AU Startsev, EA Davidson, RC Qin, H AF Startsev, EA Davidson, RC Qin, H GP IEEE TI Anisotropy-driven instability in intense charged particle beams SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID LARGE TEMPERATURE ANISOTROPY; DELTA-F SIMULATION AB We have generalized the analysis of the classical Harris instability to the case of a one-component intense charged particle beam with anisotropic temperature including the important effects of finite transverse geometry and beam space-charge. For a long. coasting beam, the delta-f particle-in-cell code BEST and the eighenmode code bEASt have been used to determine detailed 3D stability properties over a wide range of temperature anisotropy and beam intensity. A theoretical model is developed based on the Vlasov-Maxwell equations which describes the essential features of the linear stage of this instability. Both the simulations and the analytical theory clearly show that moderately intense beams are linearly unstable to short-wavelength perturbations provided the ratio of the longitudinal temperature to the transverse temperature is smaller than some threshold value. 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 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 680 EP 684 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200215 ER PT B AU Wang, CX AF Wang, CX GP IEEE TI Hamiltonian analysis of transverse dynamics in axisymmetric RF photoinjector SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A general Hamiltonian that governs the beam dynamics in an rf photoinjector is derived from first principles. With proper choice of coordinates, the resulting Hamiltonian has a simple and familiar form, while taking into account the rapid acceleration, rf focusing, magnetic focusing, and space-charge forces. From the linear Hamiltonian, beam-envelope evolution is readily obtained, which better illuminates the theory of emittance compensation. Preliminary results on the third-order nonlinear Hamiltonian will be given as well. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Wang, CX (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM wangcx@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 733 EP 735 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200232 ER PT B AU Berg, JS AF Berg, JS GP IEEE TI Longitudinal acceptance in Linear Non-Scaling FFAGS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Linear Non-Scaling FFAGs have, particularly for muon acceleration, a unique type of longitudinal motion. T is longitudinal motion can be approximated by a parabolic dependence time-of-flight on energy. This motion can be described in dimensionless variables with two parameters. I describe the relationship between the parameters and the distortion of ellipses in longitudinal space. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Berg, JS (reprint author), Brookhaven Natl Lab, POB 5000, Upton, NY 11973 USA. RI Berg, Joseph/E-8371-2014 OI Berg, Joseph/0000-0002-5955-6973 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 736 EP 738 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200233 ER PT B AU Bengtsson, J AF Bengtsson, J GP IEEE TI Control of dynamic aperture for synchrotron light sources SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID STORAGE-RINGS AB A summary of how modern analytical- and numerical techniques enable one to construct a realistic model of state-of-the-art synchrotron light sources is provided. The effects of engineering tolerances and radiation are included in a self-consistent manner. An approach for utilizing these tools to develop an effetive strategy for the design- and control of the dynamic aperture for such dynamical systems is also outlined. C1 BNL, NSLS, Upton, NY 11973 USA. RP Bengtsson, J (reprint author), BNL, NSLS, Upton, NY 11973 USA. EM bengtsson@bnl.gov NR 22 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 739 EP 741 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200234 ER PT B AU Cai, Y Nosochkov, Y AF Cai, Y Nosochkov, Y GP IEEE TI Dynamical effects due to fringe field of the magnet in circular accelerators SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The leading Lie generators, including the chromatic effects, due to hard-edge fringe field of single multipole and solenoid are derived from the vector potentials within a Hamiltonian system. These nonlinear generators are applied to the interaction region of PEP-II to analyze the linear errors due to the feed-down from the off-centered quadrupoles and solenoid. The nonlinear effects of tune shifts at large amplitude, the synchro-betatron sidebands near half integer and their impacts on the dynamic aperture are studied in the paper. C1 SLAC, Menlo Pk, CA 94025 USA. RP Cai, Y (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM yunhai@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 754 EP 756 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200239 ER PT B AU Luo, Y Pilat, F Ptitsyn, V Trbojevic, D Wei, J AF Luo, Y Pilat, F Ptitsyn, V Trbojevic, D Wei, J GP IEEE TI Comparison of off-line IR bump and action-angle kick minimization SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The interaction region bump (IR bump) nonlinear correction method has been used for the sextupole and octu-pole field error on-line corrections in the Relativistic Heavy Ion Collider (RHIC). Some differences were found for the sextupole and octupole corrector strengths between the on-line IR bump correction and the predictions from the action-angle kick minimization. In this article, we compare the corrector strengths from these two methods based on the RMC Blue ring lattice with the IR nonlinear modeling. The comparison confirms the differences between resulting corrector strengths. And the reason for the differences is found and discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Luo, Y (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 760 EP 762 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200241 ER PT B AU Montag, C AF Montag, C GP IEEE TI Simulation of resonance streaming at the ERHIC electron storage ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB To estimate electron beam lifetime and detector background at the future electron-ion collider eRHIC, knowledge of the electron beam halo region is essential. Simulations have been performed to determine the deviation of the transverse beam profile from a Gaussian distribution. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Montag, C (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 763 EP 765 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200242 ER PT B AU Qin, H Davidson, RC AF Qin, H Davidson, RC GP IEEE TI Symmetries and invariants of the time-dependent oscillator equation and the envelope equation SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID HARMONIC-OSCILLATOR AB The single-particle dynamics in a time-dependent focusing field is examined. The existence of the Courant-Snyder invariant is fundamentally a result of the corresponding symmetry admitted by the oscillator equation with time-dependent frequency. A careful analysis of the admitted symmetries reveals a deeper connection between the nonlinear envelope equation and the oscillator equation. A general theorem regarding the symmetries and invariants of the envelope equation, which includes the existence of the Courant-Snyder invariant as a special case, is demonstrated. The symmetries of the envelope equation enable a fast alogorithm for finding matched solutions without using the conventional iterative shooting method. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Qin, H (reprint author), Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 766 EP 768 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200243 ER PT B AU Kabel, A AF Kabel, A GP IEEE TI A C++ framework for conducting high-speed, long-term particle tracking simulations SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB For the purpose of conducting parallel, long-term tracking studies of storage rings such as the ones descriped in [3], [4], maximum execution speed is essential. We describe an approach involving metaprogramming techniques in C++ which results in execution speeds rivaling hand-optimized assembler code for a particular tracking lattice while retaining the generality and flexibility of an all-purpose tracking code. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94025 USA. RP Kabel, A (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94025 USA. EM akabel@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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 778 EP 780 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200247 ER PT B AU Xiao, MQ AF Xiao, MQ GP IEEE TI Phase trombone program migration for the Recycler ring at Fermilab SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A best matching algorithm was found using a test program written in Mathematica, and was integrated into an accelerator control on-line program. This on-line program now gets rid of network communication, and does not need to run code MAD. In this report, we first describe the matching conditions, and 4 cases of constrains. Using a test program written in Mathematic, given a change of tunes, we were able to find the possible combination of the quadrupole strength in trombone section for each case. We then tested the calculation results by simulations using code MAD and by experiments on the Recycler ring. Finally we found the best matching algorithm and integrated it into an accelerator control on-line program. The test results for the setting and measured tune values by running on-line program on console are also presented. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Xiao, MQ (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM meiqin@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 808 EP 810 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200257 ER PT B AU Xiao, M Yang, M Johnson, DE Alexahin, Y AF Xiao, M Yang, M Johnson, DE Alexahin, Y GP IEEE TI Study of coupling issues in the Recycler at Fermilab SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB To maximize the tune space due to momentum spread, an operating point close to the coupling resonance line is desirable. This requires a knowledge of all the coupling sources in the Recycler and a correction system capable of global decoupling to the desired level. We report on the efforts to identify major sources of coupling and verification of the integrity of the powered skew quad circuits used for global decoupling C1 Fermilab Natl Accelerator Lab, Batavia, IL 60565 USA. RP Xiao, M (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60565 USA. EM meiqin@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 811 EP 813 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200258 ER PT B AU Reichel, T Zisman, M Gollwitzer, K Werkema, S AF Reichel, T Zisman, M Gollwitzer, K Werkema, S GP IEEE TI Studies to increase the anti-proton transmission from the target to the Debuncher ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The AP2 beamline at Fermilab transports anti-protons from the production target to the Debuncher ring. The measured admittance of the Debuncher ring and the theoretical aperture of the line are larger than the size of the transmitted beam. Extensive tracking studies were done using the Accelerator Toolbox (AT) to understand the sources of the difference. As simulations pointed to chromatic effects being a source of problems, measurements were done to study this. Several possible remedies were studied including adding sextupoles to the line to reduce the chromatic effects. C1 LBNL, Berkeley, CA 94720 USA. RP Reichel, T (reprint author), LBNL, Berkeley, CA 94720 USA. EM ireichel@lbl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 817 EP 819 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200260 ER PT B AU Thompson, JM Roodman, A Kozanecki, W AF Thompson, JM Roodman, A Kozanecki, W GP IEEE TI Measurement of the vertical emittance and beta-function at the PEP-II interaction point using the BABAR detector SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We present measurements of the effective vertical emittance and IP beta-function in the PEP-E asymmetric B Factory at SLAC. These beam parameters are extracted from fits to the longitudinal dependence of the luminosity and the vertical luminous size, measured using e(+)e(-) -> mu(+)mu(-) events recorded in the BABAR detector. The results are compared, for different sets of machine conditions, to accelerator-based measurements of the optical functions of the two beams. C1 Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Thompson, JM (reprint author), Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. EM joshmt@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 820 EP 822 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200261 ER PT B AU Yan, YT Cai, Y Decker, FJ Ecklund, S Irwin, J Seeman, J Sullivan, M Turner, J Wienands, U AF Yan, YT Cai, Y Decker, FJ Ecklund, S Irwin, J Seeman, J Sullivan, M Turner, J Wienands, U GP IEEE TI Virtual accelerator for accelerator optics improvement SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Through determination of all quadrupole strengths and sextupole feed-downs by fitting quantities derivable from precision orbit measurement, one can establish a virtual accelerator that matches the real accelerator optics. These quantities (the phase advances, the Green's functions, and the coupling ellipses tilt angles and axis ratios) are obtained by analyzing turn-by-turn Beam Position Monitor (BPM) data with a model-independent analysis (MIA). Instead of trying to identify magnet errors, a limited number of quadrupoles are chosen for optimized strength adjustment to improve the virtual accelerator optics and then applied to the real accelerator accordingly. These processes have been successfully applied to PEP-II rings for beta beating fixes, phase and working tune adjustments, and coupling reduction to improve PEP-II luminosity. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Yan, YT (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM yan@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 823 EP 825 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200262 ER PT B AU Yan, YT Cai, Y AF Yan, YT Cai, Y GP IEEE TI Precision measurement of coupling ellipses parameters in a storage ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Eigen-mode coupling ellipses' tilt angles and axis ratios can be precisely measured with a Model-Independent Analysis (MIA) of the turn-by-turn Beam Position Monitor (BPM) data from resonance excitation of the betatron motion. For each BPM location one can measure 4 parameters from the two resonance excitation, which completely describe the linear coupling of the location. Results from application to PEP-II LER storage ring are presented. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Yan, YT (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM yan@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 826 EP 828 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200263 ER PT B AU Niedziela, J Montag, C Satogata, T AF Niedziela, J Montag, C Satogata, T GP IEEE TI Quadrupole beam-based alignment at RHIC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Successful implementation of a beam-based alignment algorithm, tailored to different types of quadrupoles at RHIC, provides significant benefits to machine operations for heavy ions and polarized protons. This algorithm was used to calibrate beam position monitor centers relative to interaction region quadrupoles to maximize aperture. This approach was also used to determine the optimal orbit through transition jump quadrupoles to minimize orbit changes during the transition jump for heavy ion acceleration. This paper provides background discussion and results from first measurements during the RHIC 2005 run. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Niedziela, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM niedziela@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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 829 EP 831 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200264 ER PT B AU Tepikian, S Cameron, P Della Penna, A Ptitsyn, V AF Tepikian, S Cameron, P Della Penna, A Ptitsyn, V GP IEEE TI Measurement and correction of nonlinear chromaticity in RHIC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB To improve luminosity in RHIC by using smaller beta*, higher order chromatic effects may need to be corrected [1]. Measuring of higher order chromaticities is disc cussed and compared to a model of RHIC, showing agreement. Assuming round beams, four families of octupoles are used to correct the second order chromaticities while keeping under control the amplitude dependent betatron tune spread in the beams. We show that the octupoles can reduce the second order chromaticity in RHIC, but they have insufficient strength for complete correction. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Tepikian, S (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 832 EP 834 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200265 ER PT B AU Calaga, R Abeytunge, S Bai, M Fischer, W Tomas, R Franchi, A AF Calaga, R Abeytunge, S Bai, M Fischer, W Tomas, R Franchi, A GP IEEE TI Measurement and optimization of local coupling from RHIC BPM data SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Global coupling in RHIC is routinely corrected by using three skew quadrupole families to minimize the tune split (Delta Q(min)). In this paper we propose to re-optimize transverse coupling by minimizing the resonance driving terms (RDT's) and the coupling matrix (vertical bar(C) over bar vertical bar gamma(2)) in two steps: 1. Identify locations with coupling sources by inspection of the driving terms and the C-matrix around the ring and minimize the discontinuities and 2. Find the best configuration of the three skew quadrupole families to minimize both Delta Q(min) and RDTs (f(1001)). The measurements of f(1001) and vertical bar(C) over bar vertical bar/gamma(2) at injection and top energy to identify local coupling sources are presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Calaga, R (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 835 EP 837 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200266 ER PT B AU Lessner, ES Assev, VS Ostroumov, PN AF Lessner, ES Assev, VS Ostroumov, PN GP IEEE TI Optimization of steering elements in the RIA driver linac SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The driver linac of the projected RIA facility is a versatile accelerator, a 1.4-GV, CW superconducting (SC) linac designed to simultaneously accelerate several heavy-ion charge states, providing beams from proton to uranium at 400 MeV/u at power levels at a minimum of 100 kW and Lip to 400 kW for most beams. Acceleration of multiple-charge-state uranium beams places stringent requirements on the linac design. A steering algorithm was derived that fulfilled the driver's real estate requirements, such as placement of steering dipole coils on SC solenoids and of beam position monitors outside cryostats, and beam-dynamics requirements, such as coupling effects induced by the focusing solenoids. The algorithm has been fully integrated into the tracking code TRACK and it is used to study and optimize the number and position of steering elements that minimize the multiple-beam centroid oscillations and preserve the beam emittance under misalignments of accelerating and transverse focusing, elements in the driver linac. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Lessner, ES (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM esl@phy.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 838 EP 840 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200267 ER PT B AU Sajaev, V Emery, L AF Sajaev, V Emery, L GP IEEE TI Dynamic aperture study and lifetime improvement at the Advanced Photon Source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Over the past few years, the optics of the Advanced Photon Source storage ring has been optimized to provide lower natural emittance. Presently, the APS operates at 2.5 nm-rad emittance. The optimization was done at the expense of stronger sextupoles and shorter lifetime. Here we present our work on measurement and understanding of the dynamic aperture of the APS in low-emittance mode. We found good agreement between the dynamic aperture measurements and that of the model derived from the response matrix analysis. Based oil the model, we were able to increase the lifetime significantly by optimizing sextupoles, correcting optics, moving a working point and adjusting rf voltage. The higher lifetime allowed us to decrease operating coupling from 2.5% to 1%. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Sajaev, V (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM sajaev@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 841 EP 843 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200268 ER PT B AU Sajaev, V Lebedev, V Nagaslaev, V Valishev, V AF Sajaev, V Lebedev, V Nagaslaev, V Valishev, V GP IEEE TI Fully coupled analysis of orbit response matrices at the FNAL Tevatron SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Optics measurements have played an important role in improving the performance of the Fermi National Accelerator Laboratory (FNAL) Tevatron collider. Initial optics measurements were performed using a small number of differential orbits, which allowed us to carry out the first round of optics corrections. However, because of insufficient accuracy, it was decided to apply the response matrix analysis method for further optics improvements. The response matrix program developed at Argonne National Laboratory (ANL) has been expanded to include coupling - the essential feature required to describe the Tevatron optics. The results of the optics calibration are presented and compared to local beta function measurements. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Sajaev, V (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM sajaev@aps.anl.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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 844 EP 846 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200269 ER PT B AU Yang, BX Borland, M Guo, WM Harkay, K Sajaev, V AF Yang, BX Borland, M Guo, WM Harkay, K Sajaev, V GP IEEE TI Streak camera studies of vertical synchro-betatron-coupled beam motion in the APS storage ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We present experimental studies of synchro-betatron-coupled electron beam motion in the Advanced Photon Source (APS) storage ring. We used a vertical kicker to start the beam motion. When the vertical chromaticity is nonzero, electrons with different initial synchrotron phases have slightly different betatron frequencies from the synchronous particle, resulting in a dramatic progression of bunch-shape distortion. Depending on the chromaticity and the time following the kick, images ranging from a simple tilt in the bunch to more complicated twists and bends are seen with a visible light streak camera. We found that most of the experimental observations can be described by the synchro-betatron-coupled equations of motion. Also note that the fast apparent increase in vertical beam size after the kick is dominated by the internal synchro-betatron-coupled motion of the electron bunch. Experimentally this increase could be easily confused with decoherence of vertical motion if the bunch is only imaged head-on. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Yang, BX (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM bxyang@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 847 EP 849 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200270 ER PT B AU Wan, W Byrne, WE Robin, DS Nishimura, H Portmann, G Sannibale, F Zholents, A AF Wan, W Byrne, WE Robin, DS Nishimura, H Portmann, G Sannibale, F Zholents, A GP IEEE TI Commissioning of a locally isochronous lattice at ALS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB With the advance of the ultra-fast science, manipulating electron beam at the sub-micron and nanometer scale has been actively pursued. A special lattice of the ALS storage ring was conceived to study the sub-micron longitudinal structure of the beam. It contains sections that are isochronous to the first order. Due to the practical constraints of the accelerator, sextupoles have to be off and the dispersion at the injection point is close to 60 cm, which make commissioning a highly nontrivial task. After a few months of tuning, we have been able to store at 40 mA of beam at the lifetime of 1 hour. After a brief introduction to the motivation of the experiment and the design of the lattice, the process and more detailed results of the commissioning will be presented. Future plan will also be discussed. C1 LBNL, Berkeley, CA 94720 USA. RP Wan, W (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 863 EP 865 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200276 ER PT B AU Wan, WS Steier, C AF Wan, WS Steier, C GP IEEE TI Simulation of the effect of an in-vacuum undulator on the beam dynamics of ALS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID SYNCHROTRON-RADIATION; PULSES AB The femtoslicing project at the Advanced Light Source (ALS) requires that a short period (3 cm) and narrow gap (5 mm) in vacuum undulator to be installed. The combination of the short period and the narrow gap raised concern of the impact on the beam dynamics. A 3D field model was established based on numerical data using 8 longitudinal and 4 transverse harmonics. At first fourth-order symplectic integrator was used. It was to our surprise that the dynamic aperture decreased by 30%. To understand the cause of the drastic change in the dynamic aperture, the field model was implemented in a differential algebraic code and the Taylor map of the undulator was obtained. Tracking result using the Taylor map showed little change in the dynamic aperture, which was latter corroborated using the symplectic integrator with 150 slices per period (as opposed to 10 before). Yet it is simply too time consuming to use the symplectic integrator with such thin slices. For this case, Taylor proves to be a much faster alternative. C1 LBNL, Berkeley, CA 94720 USA. RP Wan, WS (reprint author), LBNL, Berkeley, CA 94720 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 866 EP 868 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200277 ER PT B AU Wan, W Feng, J Padmore, HA AF Wan, W Feng, J Padmore, HA GP IEEE TI Design study of a new beam separator for PEEM3 SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID ELECTRON-MICROSCOPE; CORRECTOR AB Aberration correction of photoemission electron microscopes (PEEM) requires use of a magnetic beam separator. This device is a complex integrated magnetic system and is essentially fixed in its optical properties hence very susceptible to problems caused by mechanical or magnetic imperfections. Here we present a separate function design that is simple to construct, is fully adjustable and gives outstanding performance. C1 LBNL, Berkeley, CA 94720 USA. RP Wan, W (reprint author), LBNL, Berkeley, CA 94720 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 869 EP 871 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200278 ER PT B AU Shchepunov, VA Wollnik, H AF Shchepunov, VA Wollnik, H GP IEEE TI Non-linear beam dynamics in high resolution multi-pass time of flight mass separator SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A multi-pass time-of-flight mass separator (MTOF-MS) is under development by the University Radioactive Ion Beam (UNIRIB) collaboration. The MTOF consists of two coaxial electrostatic mirrors, focusing lenses and auxiliary injection, extraction and separation elements. The injected ions having almost the same energy but different masses undergo hundreds or thousands of reflections between the mirrors. In the course of this periodic motion, the ions of different masses and hence velocities are spatially separated in longitudinal direction. The periodic motion in the MTOF has been investigated with a recently developed ray tracing program utilizing the canonical integration technique. Results of the performed numerical simulations are discussed. The simulations displayed the nonlinear character of the ions' behaviour both in transverse and longitudinal phase spaces. The ions' transverse stability and longitudinal isochronicity were the matters of primary attention. It is shown in particular that at transverse tunes of around Q=0.75 the system can be adjusted to be isochronous up to at least the 3rd order of the time-of-flight (ToF) optical aberrations. C1 Oak Ridge Associated Univ, Oak Ridge, TN 37831 USA. RP Shchepunov, VA (reprint author), Oak Ridge Associated Univ, Oak Ridge, TN 37831 USA. EM shchepunov@orau.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 878 EP 880 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200281 ER PT B AU Yang, MJ AF Yang, MJ GP IEEE TI Harmonic decomposition of orbit data for multipole analysis SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This paper describes a simple analysis procedure that transforms a set of beamline orbit data into a set of harmonic orbits of first, second, and third order or higher. Each harmonic orbit can be studied individually to identify errors of the specific order with minimum interference from other orders. Effectively these are orbits caused by kicks, due to harmonic errors, propagated through linear lattice. Examples from accelerator study will be presented. The application and inherent limitations of this analysis procedure are discussed. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Yang, MJ (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM YANG@FNAL.GOV 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 881 EP 883 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200282 ER PT B AU Yang, MJ Xiao, M AF Yang, MJ Xiao, M GP IEEE TI Multipole error analysis using local 3-bump orbit data in Fermilab Recycler SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The magnetic harmonic errors of the Fermilab Recycler ring were examined using circulating beam data taken with closed local orbit bumps. Data was first parsed into harmonic orbits of first, second, and third order. Each of which was analyzed for sources of magnetic errors of corresponding order. This study was made possible only with the incredible resolution of a new BPM system that was commissioned after June of 2003. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Yang, MJ (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM YANG@FNAL.GOV 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 884 EP 886 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200283 ER PT B AU Yu, LH AF Yu, LH GP IEEE TI Performance calculation on orbit feedback for NSLSII SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We discuss the preliminary calculation on the performance of closed orbit feedback system for NSLSII, its relation to the requirement on BPM, floor and girder stability, power supply stability etc. C1 BNL, NSLS, Upton, NY 11973 USA. RP Yu, LH (reprint author), BNL, NSLS, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 902 EP 904 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200289 ER PT B AU Teytelman, D Van Winkle, D Fox, J AF Teytelman, D Van Winkle, D Fox, J GP IEEE TI Operating performance of the low group delay woofer channel in PEP-II SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In PEP-II collider a dedicated low group-delay processing channel has been developed in order to provide high damping rates necessary to control the fast-growing longitudinal eigenmodes driven by the fundamental impedances of the RF cavities. A description of the digital processing channel operating at 9.81 MHz and capable of supporting finite impulse response (FIR) controllers with up to 32 taps will be presented. A prototype system has been successfully commissioned in the High-Energy Ring (HER) in May 2004. Operating experiences with the prototype and the newly determined limits on achievable longitudinal damping will be discussed and illustrated with experimental data. C1 SLAC, Menlo Pk, CA 94025 USA. RP Teytelman, D (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM dim@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 905 EP 907 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200290 ER PT B AU Wu, JH Nash, BE Chao, AW AF Wu, JH Nash, BE Chao, AW GP IEEE TI Equilibrium beam invariants of an electron storage ring with linear x-y coupling SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In accelerators, it is common that the motion of the horizontal x-plane is coupled to that of the vertical y-plane. Such coupling will induce tune shifts and can cause instabilities. The damping and diffusion rates are also affected, which in turn will lead to a change in the equilibrium invariants. With the perturbative approach which is also used for synchrobetatron coupling [B. Nash, J. Wu, and A. Chao, work in progress], we study the x-y coupled case in this paper. Starting from the one-turn map, we give explicit formulae for the tune shifts, damping and diffusion rates, and the equilibrium invariants. We focus on the cases where the system is near the integer or half integer, and sum or difference resonances where small coupling can cause a large change in the beam distribution. C1 SLAC, Menlo Pk, CA 94025 USA. RP Wu, JH (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM jhwu@SLAC.Stanford.EDU 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 908 EP 910 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200291 ER PT B AU Wu, JH Emma, P Hendrickson, L AF Wu, JH Emma, P Hendrickson, L GP IEEE TI Linac Coherent Light Source longitudinal feedback model SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Linac Coherent Light Source (LCLS) will be the world's first x-ray free-electron laser (FEL). To ensure the vitality of FEL lasing, it is critical to preserve the high quality of the electron beam during acceleration and compression. The peak current and final energy are very sensitive to system jitter. To minimize this sensitivity, a longitudinal feedback system on the bunch length and energy is required, together with other diagnostics and feedback systems (e.g., on transverse phase space). Here, we describe a simulation framework, which includes a realistic jitter model for the LCLS accelerator system, the RF acceleration, structure wakefield, and second order optics. Simulation results show that to meet the tight requirements set by the FEL, such a longitudinal feedback system is mandatory. C1 SLAC, Menlo Pk, CA 94025 USA. RP Wu, JH (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM jhwu@SLAC.Stanford.EDU 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 911 EP 913 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200292 ER PT B AU Crisp, J Hu, M Tupikov, V AF Crisp, J Hu, M Tupikov, V GP IEEE TI Fermilab Recycler damper requirements and initial design SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The design of transverse dampers for the Fermilab Recycler storage ring is described. An observed instability and analysis of subsequent measurements are used to identify the requirements. The digital approach being implemented is presented. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Crisp, J (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM crisp@fnal.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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 917 EP 919 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200294 ER PT B AU Nicklaus, D Foster, GW Kashikhin, V AF Nicklaus, D Foster, GW Kashikhin, V GP IEEE TI First-principles simulation and comparison with beam tests for transverse instabilities and damper performance in the Fermilab Main Injector SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB An end-to-end performance calculation and comparison with beam tests was performed for the bunch-by-bunch digital transverse damper in the Fermilab Main Injector. Time dependent magnetic wakefields responsible for "Resistive Wall" transverse instabilities in the Main Injector were calculated with OPERA-2D using the actual beam pipe and dipole magnet lamination geometry. The leading order dipole component was parameterized and used as input to a bunch-by-bunch simulation which included the filling pattern and injection errors experienced in high-intensity operation of the Main Injector. The instability growth times, and the spreading of the disturbance due to newly misinjected batches was compared between simulations and beam data collected by the damper system. Further simulation models the effects of the damper system on the beam. C1 Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Nicklaus, D (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL USA. EM nicklaus@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 920 EP 922 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200295 ER PT B AU Ranjbar, VH AF Ranjbar, VH GP IEEE TI Stabilizing low frequency beam motion in the Tevatron SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A feed back orbit stabilization system is being developed using a set of BPMS and existing Tevatron corrector magnets to stabilize beam motion up to 50 microns below 25 Hz. The construction of this system is described and the stability limits and magnitude of beam motion reduction is explored. C1 Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Ranjbar, VH (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 923 EP 925 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200296 ER PT B AU Adamson, P Ashmanskas, WJ Foster, GW Hansen, S Marchionni, A Nicklaus, D Semenov, A Wildman, D AF Adamson, P Ashmanskas, WJ Foster, GW Hansen, S Marchionni, A Nicklaus, D Semenov, A Wildman, D GP IEEE TI Operational performance of a bunch by bunch digital damper in the Fermilab Main Injector SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We have implemented a transverse and longitudinal bunch by bunch digital damper system in the Fermilab Main Injector, using a single digital board for all 3 coordinates. The system has been commissioned over the last year, and is now operational in all MI cycles, damping beam bunched at both 53 MHz and 2.5 MHz. We describe the performance of this system both for collider operations and high-intensity running for the NuMI project. C1 Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Adamson, P (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL USA. EM pa@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 926 EP 928 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200297 ER PT B AU Kasemir, KU Champion, M Crofford, M Ma, HJ AF Kasemir, KU Champion, M Crofford, M Ma, HJ GP IEEE TI Adaptive feed forward beam-loading compensation experience at the Spallation Neutron Source linac SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB When initial beam studies at the Spallation Neutron Source (SNS) indicated a need for better compensation of the effects of beam-loading, a succession of rapid-prototyping and experimentation lead to the development of a simple yet successful adaptive feed forward (AFF) technique within a few weeks. We describe the process and first results. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Kasemir, KU (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 929 EP 931 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200298 ER PT B AU Yao, C Chae, Y Sereno, NS Yang, B AF Yao, C Chae, Y Sereno, NS Yang, B GP IEEE TI Investigation of APS PAR vertical beam instability SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A vertical beam instability has been observed for some time in the particle accumulator ring (PAR) of APS. It appears at low beam current when a single linac bunch is selected for PAR injection and is highly reproducible. An investigation was conducted to characterize and understand this instability. We obtained some interesting data and believe this was due to ion trapping. A more stable lattice was established as result of the investigation. This report summarizes the experimental results and gives some preliminary analysis. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Yao, C (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 5 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 982 EP 984 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200316 ER PT B AU Blednykh, A Wang, HM AF Blednykh, A Wang, HM GP IEEE TI A model study of transverse mode coupling instability at National Synchrotron Light Source-II (NSLS-II) SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The vertical impedances of the preliminary designs of National Synchrotron Light Source II (NSLS-II) Mini Gap Undulators (MGU) are calculated by means of GdfidL code. The Transverse Mode Coupling Instability (TMCI) thresholds corresponding to these impedances are estimated using an analytically solvable model. C1 Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. RP Blednykh, A (reprint author), Brookhaven Natl Lab, NSLS, Upton, NY 11973 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 985 EP 987 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200317 ER PT B AU Blednykh, A Krinsky, S Podobedov, B Rose, J Towne, N Wang, JM AF Blednykh, A Krinsky, S Podobedov, B Rose, J Towne, N Wang, JM GP IEEE TI Harmonic cavity performance for NSLS-II SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB NSLS-II is a 3 GeV ultra-high brightness storage ring planned to succeed the present NSLS rings at BNL. Ultra-low emittance combined with short bunch length means that it is critical to minimize the effects of Touschek scattering and coherent instabilities. Improved lifetime and stability can be achieved by including a third-harmonic RF cavity in the baseline design. This paper describes the required harmonic RF parameters and the expected system performance. C1 Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. RP Blednykh, A (reprint author), Brookhaven Natl Lab, NSLS, Upton, NY 11973 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 988 EP 990 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200318 ER PT B AU Balbekov, V AF Balbekov, V GP IEEE TI Transverse instability of a rectangular bunch SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Transverse instability of a rectangular bunch is investigated. Known theory of bunched beam instability is modified to take into account 100% spread of synchrotron frequency. Series of equations adequately describing the instability is derived and solved analytically and numerically. The theory is applied to the Fermilab Recycler Ring. 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 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 994 EP 996 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200320 ER PT B AU Ivanov, PM Alexahin, Y Annala, J Lebedev, VA Shiltsev, V AF Ivanov, PM Alexahin, Y Annala, J Lebedev, VA Shiltsev, V GP IEEE TI Landau damping of the weak head-tail instability at Tevatron SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Two-step improvement of transverse beam stability has been done at the Tevatron. First, shielding of the laminated Lambertson magnets significantly reduced the transverse impedance. Second, Landau damping induced by the octupoles allowed machine operation with zero chromaticity at injection. That has resulted in a dynamic aperture increase and weakening of long-range beam-beam effects due to smaller chromatic tune modulation. At collisions, the coherent tunes and incoherent tune continuum are separated due to the head-on collisions. That leads to Landau damping loss at small chromaticities. Predictions of the analytical Landau damping model are compared with experiments. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ivanov, PM (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM pmivanov@fnal.gov NR 5 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 997 EP 999 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200321 ER PT B AU Ivanov, PM Alexahin, Y Annala, J Lebedev, VA AF Ivanov, PM Alexahin, Y Annala, J Lebedev, VA GP IEEE TI Betatron tune spread generation and differential chromaticity control by octupole families at Tevatron SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Existing Tevatron octupoles have been rearranged into four functional families. Two of these families generate betatron tune spreads in the vertical and horizontal planes whereas the other two control the differential chromaticity between the proton and antiproton helices. The calculated effect on the tunes and chromaticities are compared with direct measurements. Analytical formulas for betatron tune distribution functions are presented. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ivanov, PM (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM pmivanov@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1000 EP 1002 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200322 ER PT B AU Pozdeyev, E AF Pozdeyev, E GP IEEE TI Two dimensional aspects of regenerative BBU in two-pass recirculating accelerators SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In this paper, I present the formula, describing a threshold of the regenerative multi-pass Beam Break-up (BBU) for a single dipole higher order mode with arbitrary polarization in a two-pass accelerator with a general-form 4x4 recirculation matrix. Then, I present a mathematical relation between transfer matrices between cavities of the accelerating, structure and recirculation matrices for each cavity, which must be satisfied in order to successfully suppress the BBU by reflection or rotation in several cavities. C1 JLab, Newport News, VA 23606 USA. RP Pozdeyev, E (reprint author), JLab, Newport News, VA 23606 USA. NR 8 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1006 EP 1008 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200324 ER PT B AU Stupakov, GV AF Stupakov, GV GP IEEE TI Transient resistive wall wake for very short bunches SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The catch up distance for the resistive wall wake in a round pipe is approximately equal to the square of the pipe radius divided by the bunch length. The standard formulae for this wake are applicable at distances much larger than the catch up distance. In this paper, we calculate the resistive wall wake at distances compared with the catch tip distance assuming a constant wall conductivity. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Stupakov, GV (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1009 EP 1011 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200325 ER PT B AU Feher, S Carcagno, R Orris, D Page, T Pischalnikov, Y Rabehl, R Sylvester, C Tartaglia, M Tompkins, JC AF Feher, S Carcagno, R Orris, D Page, T Pischalnikov, Y Rabehl, R Sylvester, C Tartaglia, M Tompkins, JC GP IEEE TI HTS power leads for the BTEV Interaction Region SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A new Interaction Region (IR) for the BTEV experiment was planned to be built at Fermilab. This IR would have required new superconducting quadrupole magnets and many additional power circuits for their operation. The new "low beta" quadrupole magnet design was based upon the Fermilab LHC quadrupole design, and would have operated at 9.56 kA in 4.5 K liquid helium. The use of conventional power leads for these circuits would have required substantially more helium for cooling than is available from the cryogenic plant, which is already operating close to its limit. To decrease the heat load and helium cooling, demands, the use of HTS power leads was necessary. In developing specifications for HTS leads for the BTEV interaction region, several 6 kA HTS leads produced by American Superconductor Corporation (ASC) have been tested at over-current conditions. Final design requirements were to be based on these test results. This paper summarizes the test results and describes the design requirements for the 9.65 kA HTS power leads. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Feher, S (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM fehers@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1039 EP 1041 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200335 ER PT B AU Kashikhin, VS Carson, JA Harding, DJ Lackey, JR Makarov, A Pellico, W Prebys, EJ AF Kashikhin, VS Carson, JA Harding, DJ Lackey, JR Makarov, A Pellico, W Prebys, EJ GP IEEE TI A new correction magnet package for the Fermilab Booster Synchrotron SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Since its initial operation over 30 years ago, most correction magnets in the Fermilab Booster Synchrotron have only been able to fully correct the orbit, tunes, coupling, and chromaticity at injection (400MeV). We have designed a new correction package, including horizontal and vertical dipoles, normal and skew quadrupoles, and normal and skew sextupoles, to provide control up to the extraction energy (8GeV). In addition to tracking the 15Hz cycle of the main, combined function magnets, the quadrupoles and sextupoles must swing through their full range in 1 ms during transition crossing. The magnet is made from 12 water-cooled racetrack coils and an iron core with 12 poles, dramatically reducing the effective magnet air gap and increasing the corrector efficiency. Magnetic field analyses of different combinations of multipoles are included. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Kashikhin, VS (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM kash@fnal.gov NR 5 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1042 EP 1044 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200336 ER PT B AU Lackey, JR Carson, JA Ginsburg, CM Glass, HD Harding, DJ Kashikhin, VS Makarov, A Prebys, EJ AF Lackey, JR Carson, JA Ginsburg, CM Glass, HD Harding, DJ Kashikhin, VS Makarov, A Prebys, EJ GP IEEE TI New pulsed orbit bump magnets for the Fermilab Booster Synchrotron SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The beam from the Fermilab Linac is injected onto a bump in the closed orbit of the Booster Synchrotron where a carbon foil strips the electrons from the Linac's negative ion hydrogen beam. Although the Booster itself runs at 15 Hz, heat dissipation in the orbit bump magnets has been one Limitation to the fraction of the cycles that can be used for beam. New 0.28 T pulsed dipole magnets have been constructed that will fit into the same space as the old ones, run at the full repetition rate of the Booster, and provide a larger bump to allow a cleaner injection orbit. The new magnets use a ferrite in the yoke rather than laminated steel. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Lackey, JR (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM lackey@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1045 EP 1047 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200337 ER PT B AU Harder, D Chouhan, S Lehecka, M Rakowsky, G Skaritka, J Tanabe, T AF Harder, D Chouhan, S Lehecka, M Rakowsky, G Skaritka, J Tanabe, T GP IEEE TI Magnetic measurement system for the NSLS superconducting undulator vertical test facility SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID FIELD AB One of the challenges of small-gap superconducting undulators is measurement of magnetic fields within the cold bore to characterize the device performance and to determine magnetic field errors for correction or shimming, as is done for room-temperature undulators. Both detailed field maps and integrated field measurements are required. This paper describes a 6-element, cryogenic Hall probe field mapper for the NSLS superconducting undulator Vertical Test Facility (VTF) [I]. The probe is designed to work in an aperture only 3 mm high. A pulsed-wire insert is also being developed, for visualization of the trajectory, for locating steering errors and for determining integrated multi-pole errors. The pulsed-wire insert is interchangeable with the Hall probe mapper. The VTF and the magnetic measurement systems can accommodate undulators up to 0.4 m in length. C1 Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. RP Harder, D (reprint author), Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. EM dharder@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1063 EP 1065 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200343 ER PT B AU Xu, JZ Vasserman, I AF Xu, JZ Vasserman, I GP IEEE TI A new magnetic field integral measurement system SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In order to characterize the insertion devices at the Advanced Photon Source (APS) more efficiently, a new stretched-coil magnetic field integral measurement system has been developed. The system uses the latest state-of-the-art field-programmable gate array (FPGA) technology to compensate the speed variations of the coil motions. Initial results demonstrated that the system achieves a system measurement reproducibility of 0.15 Gauss centimeter (G-cm) in a field integral measurement of 600 G-cm, probably the world's best of its kind. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Xu, JZ (reprint author), Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1066 EP 1068 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200344 ER PT B AU Tanabe, T Blednykh, A Harder, D Lehecka, M Rakowsky, G Skaritka, J AF Tanabe, T Blednykh, A Harder, D Lehecka, M Rakowsky, G Skaritka, J GP IEEE TI Insertion device upgrade plans at the NSLS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This paper describes plans to upgrade insertion devices (IDs) at the National Synchrotron Light Source (NSLS), Brookhaven National Laboratory, U.S.A. The aging wiggler (W120) at X25 is being replaced by a I in long in-vacuum mini-gap undulator (MGU-X25) optimized for a dedicated macromolecular crystallography program. A new, 1/3 in long, undulator (MGU or SCU-X9), will be installed between a pair of RF cavities at X9, and will serve a new beamline dedicated for small angle x-ray scattering (SAXS). Both IDs will have provision for cryocooling the NdFeB hybrid arrays to 150K to raise the field and K-value and to obtain better spectral coverage. Design issues of the devices and other considerations, especially magnetic measurement at low temperature, will be discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Tanabe, T (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1075 EP 1077 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745200347 ER PT B AU Kim, SH Doose, C AF Kim, SH Doose, C GP IEEE TI Magnetic field analysis of a planar superconducting undulator with variable field polarizations SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A planar superconducting undulator (SCU), which generates horizontal and vertical fields, B(x), and B(y), perpendicular to the beam directions, is inserted in between the magnetic poles of another unit, which generates the vertical field B(y). Analytical formulae of the magnetic fields are presented for the inserted, as well as the vertical-field, units. A scaling law may be applied to the SCU. The angle of the coil windings for the inserted unit is analyzed to maximize B(x). The range of the optimum rotation angle, for the range of gap/period ratio 0.1 - 0.6, is calculated to be 30 degrees - 40 degrees. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Kim, SH (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. EM shkim@aps.anl.gov NR 5 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1102 EP 1104 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201004 ER PT B AU Kim, SH Doose, C Kustom, RL Moog, ER Vasserman, I AF Kim, SH Doose, C Kustom, RL Moog, ER Vasserman, I GP IEEE TI R&D of short-period NbTi and Nb(3)Sn superconducting undulators for the APS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Superconducting undulators (SCUs) with a period of 14.5 mm are under development for the Advanced Photon Source (APS). The undulators have been designed to achieve a peak field on the beam axis higher than 0.8 T with an 8 mm pole gap and current densities over I kA/mm(2) in the NbTi and Nb(3)Sn coils. Upper-half NbTi SCUs of short sections have been fabricated and were charged up to near the critical current density of 1.43 kA/mm(2) to achieve a peak field about I T. The stability margin of the SCU was measured by imposing steady-state heat fluxes on the pole/coil face of the SCU in a pool-boiling liquid He (LHe) dewar at 4.2 K. Near the critical current density, where the temperature stability margin is minimal, the heat flux density to quench the SCU was about 1.3 mW/mm(2), of which 60% was attributed to LHe at the interface of the SCU and the vacuum chamber. The peak fields of the SCU were mapped along the beam axis using a Hall probe in a vertical dewar. The first test of a Nb3Sn short-section SCU was charged to an average current density of 1.45 kA/mM, slightly higher than the critical current density for the NbTi SCU. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Kim, SH (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. EM shkim@aps.anl.gov NR 4 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1105 EP 1107 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201005 ER PT B AU Willen, E Anerella, M Escallier, J Ganetis, G Ghosh, A Gupta, R Harrison, M Jain, A Luccio, A MacKay, W Marone, A Muratore, J Plate, S Roser, T Tsoupas, N Wanderer, P AF Willen, E Anerella, M Escallier, J Ganetis, G Ghosh, A Gupta, R Harrison, M Jain, A Luccio, A MacKay, W Marone, A Muratore, J Plate, S Roser, T Tsoupas, N Wanderer, P GP IEEE TI Superconducting helical snake magnet for the AGS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A superconducting helical magnet has been built for polarized proton acceleration in the Brookhaven AGS. This "partial Snake" magnet will help to reduce the loss of polarization of the beam due to machine resonances. It is a 3 T magnet some 1940 mm in magnetic length in which the dipole field rotates with a pitch of 0.2053 degrees/mm for 1154 turn in the center and a pitch of 0.3920 degrees/mm for 393 mm. in each end. The coil cross-section is made of two slotted cylinders containing superconductor. In order to minimize residual offsets and deflections of the beam on its orbit through the Snake, a careful balancing of the coil parameters was necessary. In addition to the main helical coils, a solenoid winding was built on the cold bore tube inside the main coils to compensate for the axial component of the field that is experienced by the beam when it is off-axis in this helical magnet. Also, two dipole corrector magnets were placed on the same tube with the solenoid. A low heat leak cryostat was built so that the magnet can operate in the AGS cooled by several cryocoolers. The design, construction and performance of this unique magnet will be summarized. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Willen, E (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM willen@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1129 EP 1131 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201013 ER PT B AU Gupta, R Anerella, M Harrison, M Schmalzle, J Sampson, W Zeller, A AF Gupta, R Anerella, M Harrison, M Schmalzle, J Sampson, W Zeller, A GP IEEE TI Test results of HTS coils and an R&D magnet for RIA SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This paper presents the successful construction and test results of a magnetic mirror model for the Rare Isotope Accelerator (RIA) that is based on High Temperature Superconductors (HTS). In addition, the performance of thirteen coils (each made with similar to 220 meters of commercially available HTS tape) is also presented. The proposed HTS magnet is a crucial part of the R&D for the Fragment Separator region where the magnets are subjected to several orders of magnitude more radiation and energy deposition than typical beam line and accelerator magnets receive during their entire lifetime. A preliminary design of an HTS dipole magnet for the Fragment Separator region is also presented. C1 BNL, Upton, NY 11973 USA. RP Gupta, R (reprint author), BNL, Upton, NY 11973 USA. EM gupta@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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1132 EP 1134 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201014 ER PT B AU Gupta, R Anerella, M Ghosh, A Harrison, M Schmazle, J Wanderer, P Mokhov, N AF Gupta, R Anerella, M Ghosh, A Harrison, M Schmazle, J Wanderer, P Mokhov, N GP IEEE TI Optimization of open midplane dipole design for LHC IR upgrade SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This paper presents the optimized designs of an "open midplane dipole" [1] for "dipole first optics" [2] for the proposed luminosity upgrade of the Large Hadron Collider (LHC). It was found [3] that in this design at luminosity of 10(31) cm(-2)s(-1), the peak power density in the coils can be up to two orders of magnitude higher than that at the present baseline luminosity (10(14) cm(-2)s(-1)). This comes from a large quantity of spray particles from Interaction Point (IP) that is mostly concentrated at the midplane. The "open midplane dipole" design is the only design so far that has been found to provide reliable quench-stable operation with a lifetime of the critical components of at least ten years. In addition to a summary of magnetic, mechanical and energy deposition calculations for various iterations, the inherent benefits and challenges associated with the "open midplane dipole" design are also discussed. Results are presented for a recently proposed attractive option with the dipole splitted in two with a warm absorber placed between the two [4]. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Gupta, R (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM gupta@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1135 EP 1137 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201015 ER PT B AU Muratore, J Jain, A Anerella, M Cozzolino, J Ganetis, G Ghosh, A Gupta, R Harrison, M Marone, A Plate, S Schmalzle, J Thomas, R Wanderer, P Willen, E Wu, KC AF Muratore, J Jain, A Anerella, M Cozzolino, J Ganetis, G Ghosh, A Gupta, R Harrison, M Marone, A Plate, S Schmalzle, J Thomas, R Wanderer, P Willen, E Wu, KC GP IEEE TI Test results for LHC insertion region dipole magnets SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Superconducting Magnet Division at Brookhaven National Laboratory (BNL) has made 20 insertion region dipoles for the Large Hadron Collider (LHC) at CERN. These 9.45 m-long, 8 cm aperture magnets have the same coil design as the arc dipoles now operating in the Relativistic Heavy Ion Collider (RHIC) at BNL and are of single aperture, twin aperture, and double cold mass configurations. They are required to produce fields up to 4.14 T for operation at 7.56 TeV Eighteen of these magnets have been tested at 4.5 K using either forced flow supercritical helium or liquid helium. The testing was especially important for the twin aperture models, whose construction was very different from the RHIC dipoles. except for the coil design. This paper reports on the results of these tests, including spontaneous quench performance, verification of quench protection heater operation, and magnetic field quality. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Muratore, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM muratore@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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1138 EP 1140 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201016 ER PT B AU Harding, DJ Bauer, PC Blowers, JN DiMarco, J Glass, HD Hanft, RW Carson, JA Robotham, WF Tartaglia, MA Tompkins, JC Velev, G AF Harding, DJ Bauer, PC Blowers, JN DiMarco, J Glass, HD Hanft, RW Carson, JA Robotham, WF Tartaglia, MA Tompkins, JC Velev, G GP IEEE TI Restoring the skew quadrupole moment in Tevatron dipoles SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In early 2003 it was realized that mechanical changes in the Tevatron dipoles had led to a deterioration of the magnetic field quality that was hindering operation of the accelerator. After extensive study, a remediation program was started in late 2003 that will continue through 2005. The mechanical and magnetic effects are discussed. The readjustment process and experience are reported, along with other observations on aging magnets. C1 Fermilab Astrophys Ctr, Batavia, IL 60510 USA. RP Harding, DJ (reprint author), Fermilab Astrophys Ctr, Batavia, IL 60510 USA. EM harding@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1144 EP 1146 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201018 ER PT B AU Gulley, M Alvestad, HW Barkley, WC Barlow, DB Barr, DS Bennett, GA Bitteker, LJ Bjorklund, E Borden, MJ Burns, MJ Carr, G Casados, JL Chacon, S Cohen, S Cordova, JF Faucett, JA Fernandez, LE Fitzgerald, D Fresquez, M Gallegos, FR Garnett, R Gilpatrick, JD Gonzales, F Gorman, FW Hall, MJ Hayden, DJ Henderson, D Johns, GD Kerstiens, D Lusk, MD Maestas, AJ Marquez, HP Martinez, D Martinez, MP Merrill, JB Meyer, RE Morgan, EA Naranjo, A O'Hara, JF Olivas, FR Oothoudt, MA Pence, TD Perez, EM Pillai, C Roller, BJ Romero, AM Romero, DB Romero, FP Sanchez, G Sandoval, JB Schaller, S Shelley, FE Shurter, RB Sims, JR Stockton, JL Sturrock, J Vigil, VP Zaugg, T AF Gulley, M Alvestad, HW Barkley, WC Barlow, DB Barr, DS Bennett, GA Bitteker, LJ Bjorklund, E Borden, MJ Burns, MJ Carr, G Casados, JL Chacon, S Cohen, S Cordova, JF Faucett, JA Fernandez, LE Fitzgerald, D Fresquez, M Gallegos, FR Garnett, R Gilpatrick, JD Gonzales, F Gorman, FW Hall, MJ Hayden, DJ Henderson, D Johns, GD Kerstiens, D Lusk, MD Maestas, AJ Marquez, HP Martinez, D Martinez, MP Merrill, JB Meyer, RE Morgan, EA Naranjo, A O'Hara, JF Olivas, FR Oothoudt, MA Pence, TD Perez, EM Pillai, C Roller, BJ Romero, AM Romero, DB Romero, FP Sanchez, G Sandoval, JB Schaller, S Shelley, FE Shurter, RB Sims, JR Stockton, JL Sturrock, J Vigil, VP Zaugg, T GP IEEE TI The LANSCE Switchyard kicker project SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Until 2003, the existing configuration of the Los Alamos Neutron Scattering Center (LANSCE) switchyard did not allow simultaneous delivery of the H beam to Lines D and X. In the late 1990's, with increased activities in Areas B and C, which serve the ultracold neutron experiments (UCN) and proton radiography (pRad), respectively, planning began to increase beam availability to all areas by installing a kicker system, dubbed the "Switchyard Kicker." The Switchyard Kicker is a system of two pulsed and two direct current magnets that enables simultaneous, uninterrupted beam delivery to Line D for the Lujan Center and the Weapons Neutron Research (WNR) Facility and, on request, a tailored H beam pulse to Line X for the pRad and UCN research areas. The project received funding in July 2001 for design and implementation. During the 2003 Extended Maintenance Period this upgrade was installed in the Switchyard and commissioned during the Accelerator Turn-On period in the summer of 2003. With the commissioning successful, LANSCE now routinely operates in "Kick" mode, delivering simultaneous beam to Line X and Line D, increasing beam availability to all areas and simplifying production scheduling. C1 LANL, Los Alamos, NM 87545 USA. RP Gulley, M (reprint author), LANL, Los Alamos, NM 87545 USA. EM gulley@lanl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1147 EP 1149 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201019 ER PT B AU Kahn, SA Kirk, HG Mills, FE Cline, D Garren, AA AF Kahn, SA Kirk, HG Mills, FE Cline, D Garren, AA GP IEEE TI Design of a magnet system for a muon cooling ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A hydrogen gas filled storage ring appears to be a promising approach to reducing the emittance of a muon beam for use in a neutrino factory or a muon collider. A small muon cooling ring is being studied to test the feasibility of cooling by this method. This paper describes the magnet system to circulate the muons. The magnet design is optimized to produce a large dynamic aperture to contain the muon beam with minimum losses. Muons are tracked through the field to verify the design. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kahn, SA (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1153 EP 1155 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201021 ER PT B AU Green, MA Li, D Virostek, SP Lau, W Witte, H Yang, SQ Drumm, P Ivanyushenkov, Y AF Green, MA Li, D Virostek, SP Lau, W Witte, H Yang, SQ Drumm, P Ivanyushenkov, Y GP IEEE TI Progress on the coupling coil for the MICE channel SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This report describes the progress on the coupling magnet for the 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. The MICE RF coupling coil module (RFCC module) consists of a 1.56 in diameter superconducting solenoid, mounted around four cells of conventional 201.23 MHz closed RF cavities. This report discusses the progress that has been made on the superconducting coupling coil that is around the center of the RF coupling module. This report describes the process by which one would cool the coupling coil using a single small 4 K cooler. In addition, the coupling magnet power system and quench protection system are also described. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Green, MA (reprint author), 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1159 EP 1161 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201023 ER PT B AU Shuman, D Barry, W Prestemon, S Schlueter, R Steier, C Stover, G AF Shuman, D Barry, W Prestemon, S Schlueter, R Steier, C Stover, G GP IEEE TI Stray field reduction of ALS eddy current septum magnets SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Stray field from an eddy current septum magnet adversely affects the circulating beam and can be reduced using several techniques. The stray field time history typically has a fast rise section followed by a long exponential decay section when pulsed with a half sine drive current. Changing the drive current pulse to a full sine has the effect of both reducing peak stray field magnitude by similar to 3x and producing a quick decay from this peak to a lower field level which then has a similar long decay time constant as that from the half sine drive current pulse. A method for tuning the second half-sine (reverse) current pulse to eliminate the long exponential decay section is given. A method for halving the remaining brief peak is also given. C1 LBNL, Berkeley, CA 94720 USA. RP Shuman, D (reprint author), LBNL, Berkeley, CA 94720 USA. EM DBShuman@lbl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1174 EP 1176 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201028 ER PT B AU Shuman, D Faltens, A Kajiyama, Y Kireeff-Covo, M Seidl, P AF Shuman, D Faltens, A Kajiyama, Y Kireeff-Covo, M Seidl, P GP IEEE TI A compact high gradient pulsed magnetic quadrupole SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A design for a high gradient, low inductance pulsed quadrupole magnet is presented. The magnet is a circular current dominated design with a circular iron return yoke. Conductor angles are determined by a method of direct multipole elimination which theoretically eliminates the first four higher order multipole field components. Coils are fabricated from solid round film-insulated conductor, wound as a single layer "non-spiral bedstead" coil having a diagonal leadout entirely within one upturned end. The coils are wound and stretched straight in a special winder, then bent in simple fixtures to form the upturned ends. C1 LBNL, Berkeley, CA 94720 USA. RP Shuman, D (reprint author), LBNL, Berkeley, CA 94720 USA. EM DBShuman@lbl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1177 EP 1179 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201029 ER PT B AU Shuman, D Henestroza, E Ritchie, G Waldron, W Vanacek, D Yu, SS AF Shuman, D Henestroza, E Ritchie, G Waldron, W Vanacek, D Yu, SS GP IEEE TI A pulsed solenoid for intense ion beam transport SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A design for a pulsed solenoid magnet is presented. Some simple design formulas are given that are useful for initial design scoping. Design features to simplify fabrication and improve reliability are presented. Fabrication, assembly, and test results are presented. C1 LBNL, Berkeley, CA 94720 USA. RP Shuman, D (reprint author), LBNL, Berkeley, CA 94720 USA. EM DBShuman@lbl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1180 EP 1182 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201030 ER PT B AU Pai, C Hahn, H Hseuh, H Lee, Y Meng, W Mi, J Sandberg, J Todd, R Raparia, D Tsoupas, N Tuozzolo, J Warburton, D Wei, J Weiss, D Zhang, W AF Pai, C Hahn, H Hseuh, H Lee, Y Meng, W Mi, J Sandberg, J Todd, R Raparia, D Tsoupas, N Tuozzolo, J Warburton, D Wei, J Weiss, D Zhang, W GP IEEE TI Construction and power test of the extraction kicker magnet for spallation neutron source accumulator ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Two extraction kicker magnet assemblies that contain seven individual pulsed magnet modules each will kick the proton beam vertically out of the SNS accumulator ring into the aperture of the extraction Lambertson septum magnet. The proton beam then travels to the 1.4 MW SNS target assembly. The 14 kicker magnets and major components of the kicker assembly have been fabricated by BNL. The inner surfaces of the kicker magnets were coated with TiN to reduce the secondary electron yield. All 14 power supplies have been built, tested and delivered to ORNL. Before final installation, a partial assembly of the kicker system with three kicker magnets was assembled to test the functions of each critical component in the system. In this paper we report the progress of the construction of the kicker components, the TiN coating of the magnets, the installation procedure of the magnets and the full power test of a kicker magnet with the power supply. 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. EM pai@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1183 EP 1185 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201031 ER PT B AU Rank, J Miglionico, G Raparia, D Tsoupas, N Tuozzolo, J Lee, YY AF Rank, J Miglionico, G Raparia, D Tsoupas, N Tuozzolo, J Lee, YY GP IEEE TI The Extraction Lambertson Septum Magnet of the SNS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In the Spallation Neutron Source, after multiple injections to an accumulator ring, a final extraction delivers the full proton beam to the target, achieved by a series of kickers and a thin septum magnet. Here we discuss the lattice geometry, beam dynamics and optics, and the vacuum, electromagnetic and mechanical design aspects of the Extraction Larnbertson Septum Magnet (ELS). Relevant datum are established. Vector calculus is solved for pitch and roll angles, which are shown schematically in magnet sections. 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 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1186 EP 1188 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201032 ER PT B AU Wang, JG Tsoupas, N Venturini, M AF Wang, JG Tsoupas, N Venturini, M GP IEEE TI 3D-simulation studies of SNS ring doublet magnets SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The accumulator ring of the Spallation Neutron Source (SNS) at ORNL employs in its straight sections closely packed quadrupole doublet magnets with large aperture of R=15.1 cm and relatively short iron-to-iron distance of 51.4 cm. These quads have much extended fringe field, and magnetic interferences among them in the doublet assemblies is not avoidable. Though each magnet in the assemblies has been individually mapped to high accuracy of lower 10(-4) level, the experimental data including the magnet interference effect in the assemblies will not be available. We have performed 3D computing simulations on a quadrupole doublet model in order to assess the degree of the interference and to obtain relevant data for the SNS ring commissioning and operation. C1 ORNL, SNS, Oak Ridge, TN 37831 USA. RP Wang, JG (reprint author), ORNL, SNS, Oak Ridge, TN 37831 USA. EM jgwang@ornl.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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1189 EP 1191 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201033 ER PT B AU Wang, JG AF Wang, JG GP IEEE TI Field distributions of injection chicane dipoles in SNS ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB 3D computing simulations have been performed at ORNL to study the magnetic field distributions of two injection chicane dipoles in the SNS ring. The simulation studies have yielded the performance characteristics of the dipoles and generated magnetic field data in three dimensional grids. Based on the simulation data, a 3D multipole expansion of the chicane dipole field, consisting of generalized gradients and their derivatives, has been made. The expansion is quasi-analytical by fitting numeric data into a few interpolation functions. A 5(th)-order representation of the field is generated, and the effects of even higher order terms on the field representation are discussed. C1 Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 USA. RP Wang, JG (reprint author), Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 USA. EM jgwang@ornl.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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1192 EP 1194 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201034 ER PT B AU Trakhtenberg, E Erdmann, M Powers, T AF Trakhtenberg, E Erdmann, M Powers, T GP IEEE TI Undulator for the LCLS project - Changes in the magnet structure design SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The design modifications of a new hybrid-type undulator with a fixed gap of 6.8 mm, a period of 30 mm and a length of 3.4 in are resented. The prior pole design included side "wings,s" which were used for precise positioning, and clamps to fasten the poles to the magnet base. This design has been replaced by a more straightforward assembly, where the pole is attached to the magnet structure base using only two screws. Tests were performed on the vanadium permendur pole material to prove that the threaded holes are easy to fabricate and are able to successfully withstand the torque required to hold the pole in place. A fixture was also developed to ensure the precise location of the poles on the base during assembly. In addition to the pole modifications, the magnet-structure base is now manufactured as one piece as opposed to three, which greatly eases assembly. Finally, a small section of the original prototype had these changes successfully implemented, and the test results are presented. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Trakhtenberg, E (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1210 EP 1212 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201040 ER PT B AU Biallas, G Benson, S Hiatt, T Nell, G Snyder, M AF Biallas, G Benson, S Hiatt, T Nell, G Snyder, M GP IEEE TI An 8 cm period electromagnetic wiggler magnet with coils made from sheet copper SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB An electromagnetic wiggler, now lasing at the Jefferson Lab FEL, has 29 eight cm periods with K variable from 0.5 to 1.1 and gap of 2.6 cm. The wiggler was made inexpensively in 11 weeks by an industrial machine shop. The conduction cooled coil design uses copper sheet material cut to forms using water jet cutting. The conductor is cut to serpentine shapes and the cooling plates are cut to ladder shape. The sheets are assembled in stacks insulated with polymer film, also cut with water jet. The coil design extends the serpentine conductor design of the Duke OK4 to more and smaller conductors. The wiggler features graded fields in the two poles at each end and trim coils on these poles to eliminate field errors caused by saturation. An added critical feature is mirror plates at the ends with integral trim coils to eliminate three dimensional end field effects and align the entrance and exit orbit with the axis of the wiggler. Details of construction, measurement methods and excellent wiggler performance are presented. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Biallas, G (reprint author), Jefferson Lab, Newport News, VA 23606 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1213 EP 1215 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201041 ER PT B AU Sasaki, S Petra, M Vasserman, IB Doose, CL Moog, ER Mokhov, NV AF Sasaki, S Petra, M Vasserman, IB Doose, CL Moog, ER Mokhov, NV GP IEEE TI Radiation damage to advanced photon source undulators SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Radiation-induced magnetic field strength losses are seen in undulator permanent magnets in the two sectors with small-aperture (5 mm) vacuum chambers. Initially, simple retuning of the affected undulators could restore them to full operation. As the damage has accumulated, however, it has become necessary to disassemble the magnetic arrays and either replace magnet blocks or remagnetize and reinstall magnet blocks. Some of the damaged magnet blocks have been studied, and the demagnetization was found to be confined to a limited volume at the surface close to the electron beam. Models for the magnetic damage were calculated using RADIA and were adjusted to reproduce the measurements. Results suggest that a small volume at the surface has acquired a weak magnetization in the opposite direction. Simulations of the radiation environment at the undulators have been performed with the MARS 15 code. C1 Argonne Natl Lab, APS, Argonne, IL 60439 USA. RP Sasaki, S (reprint author), Argonne Natl Lab, APS, 9700 S Cass Ave, Argonne, IL 60439 USA. EM sasaki@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1216 EP 1218 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201042 ER PT B AU Pinayev, I Shaftan, TV AF Pinayev, I Shaftan, TV GP IEEE TI Fast magnets for the NSLS-II injection SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Third generation light sources require top-off operation in order to provide high stability of the photon beam. In this paper we present a conceptual design of the fast pulsed magnets used for injection into the 3 GeV storage ring. Because the NSLS-II project is in the design stage possible variants of the injection straight section are also discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Pinayev, I (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM pinayev@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1222 EP 1223 PG 2 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201044 ER PT B AU Ekdahl, C Abeyta, EO Bartsch, R Caudill, L Chan, KCD Dalmas, D Eversole, S Gallegos, R Harrison, J Holzscheiter, M Johnson, J Jacquez, E McCuistian, BT Montoya, N Nath, S Nielsen, K Oro, D Rodriguez, L Rodriguez, P Rowton, L Sanchez, M Scarpetti, R Schauer, M Simmons, D Smith, HV Studebaker, J Sullivan, G Swinney, C Temple, R Chen, YJ Houck, T Henestroza, E Eylon, S Fawley, W Yu, SS Bender, H Broste, W Carlson, C Durtschi, G Frayer, D Johnson, D Jones, K Meidinger, A Moy, K Sturgess, R Tipton, A Tom, CY Schulze, M Hughes, T Mostrom, C Tang, Y Briggs, R AF Ekdahl, C Abeyta, EO Bartsch, R Caudill, L Chan, KCD Dalmas, D Eversole, S Gallegos, R Harrison, J Holzscheiter, M Johnson, J Jacquez, E McCuistian, BT Montoya, N Nath, S Nielsen, K Oro, D Rodriguez, L Rodriguez, P Rowton, L Sanchez, M Scarpetti, R Schauer, M Simmons, D Smith, HV Studebaker, J Sullivan, G Swinney, C Temple, R Chen, YJ Houck, T Henestroza, E Eylon, S Fawley, W Yu, SS Bender, H Broste, W Carlson, C Durtschi, G Frayer, D Johnson, D Jones, K Meidinger, A Moy, K Sturgess, R Tipton, A Tom, CY Schulze, M Hughes, T Mostrom, C Tang, Y Briggs, R GP IEEE TI DARHT-II long-pulse beam-dynamics experiments SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID ACCELERATOR AB When completed, the DARHT-II linear induction accelerator (LIA) will produce a 2 kA, 18 MeV electron beam with more than 1500 ns current/energy "flat-top." In initial tests DARHT-II has already accelerated beams with current pulse lengths from 500 ns to 1200 ns full-width at half maximum (FWHM) with more than 1.2 kA peak current and 12.5 MeV peak energy. Experiments will soon begin with a similar to 1600 ns flat-top pulse, but with reduced current and energy. These pulse lengths are all significantly longer than any other multi-MeV LIA, and they define a novel regime for high-current beam dynamics, especially with regard to beam stability. Although the initial tests demonstrated the robustness of the DARHT-II LIA to BBU, the < 1200 ns FWHM pulse lengths were too short to test the predicted protection against ion-hose instability. The present experiments are designed to resolve these and other beam-dynamics issues with a similar to 1600 ns pulse length beam. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Ekdahl, C (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1252 EP 1256 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201053 ER PT B AU Chan, KCD Davis, HA Ekdahl, CA Schulze, ME Hughes, TP Genoni, TC AF Chan, KCD Davis, HA Ekdahl, CA Schulze, ME Hughes, TP Genoni, TC GP IEEE TI Ion effects in the DARHT-II downstream transport SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The DARHT-II accelerator produces an 18-MeV, 2-kA, 2-mu s electron beam pulse. After the accelerator, the pulse is delivered to the final focus on an x-ray producing target via a beam transport section called the Downstream Transport. Ions produced due to beam ionization of residual gases in the Downstream Transport call affect the beam dynamics. Ions generated by the head Of the pulse will cause modification of space-charge forces at the tail of the pulse so that the beam head and tail will have different beam envelopes. They may also induce ion-hose instability at the tail of the Pulse. If these effects are significant, the focusing requirements of beam lead and tail at the final focus will become very different. The focusing of the complete beam pulse will be time dependent and difficult to achieve, leading to less efficient x-ray production. In this paper, we will describe the results of our calculations of these ion effects at different residual-gas pressure levels. Our goal is to determine the maximum residual-gas pressure allowable in DARHT-II Downstream Transport such that the required final beam focus is achievable over the entire beam pulse under these deleterious ion effects. 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 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1267 EP 1269 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201056 ER PT B AU Zhang, W Sandberg, J Cutler, R Ducimetiere, L Fowler, A Mertens, V Kawakubo, T Shirakabe, Y AF Zhang, W Sandberg, J Cutler, R Ducimetiere, L Fowler, A Mertens, V Kawakubo, T Shirakabe, Y GP IEEE TI Pulsed power applications in high intensity proton rings SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID KICKER AB Pulsed power technology has been applied in particle accelerators and storage rings for over four decades. It is most commonly used in injection, extraction, beam manipulation, source, and focusing systems. These systems belong to the class of repetitive pulsed power. In this presentation, we review and discuss the history, present status, and future challenge of pulsed power applications in high intensity proton accelerators and storage rings. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Zhang, W (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1278 EP 1282 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201059 ER PT B AU Cook, EG Akana, G Gower, EJ Hawkins, SA Hickman, BC Brooksby, CA Cassel, RL De Lamare, JE Nguyen, MN Pappas, GC AF Cook, EG Akana, G Gower, EJ Hawkins, SA Hickman, BC Brooksby, CA Cassel, RL De Lamare, JE Nguyen, MN Pappas, GC GP IEEE TI Solid-state modulators for RF and fast kickers SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB As the switching capabilities of solid-state devices increase, these devices are being incorporated into modulator designs for high voltage accelerator applications. Solid-state modulators based on inductive adder circuit topology have demonstrated great versatility with regard to pulse width and pulse repetition rate while maintaining fast pulse rise and fall times. Additionally, these modulators are capable of being scaled to higher Output voltage and power levels. An explanation of the basic circuit operation will be presented as well as test data of several different hardware Systems. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Cook, EG (reprint author), Lawrence Livermore Natl Lab, POB 5508, Livermore, CA 94550 USA. NR 3 TC 0 Z9 0 U1 2 U2 4 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1283 EP 1287 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201060 ER PT B AU Jensen, CC Krafczyk, GE AF Jensen, CC Krafczyk, GE GP IEEE TI Numi proton kicker extraction system SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This system extracts up to 9.6 ys of 120 GeV beam every 1.87 seconds for the NuMI beamline neutrino experiments. A pulse forming network consisting of two continuous wound coils and 68 capacitors was designed and built to drive three kicker magnets. The field stability requirement is better than +/- 1% with a field rise time of 1.52 mu s. New kicker magnets were built based on the successful traveling wave magnets built for the Main Injector. Two of these magnets are in series which places a serious constraint on the rise time of the pulser. A forced cooling system using Fluorinert (R) was designed for the magnet termination resistors to maintain the field flatness and amplitude stability. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Jensen, CC (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1288 EP 1290 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201061 ER PT B AU Sampayan, S Caporaso, G Chen, YJ Hawkins, S Holmes, C McCarrick, J Nelson, S Nunnally, W Poole, B Rhodes, M Sanders, D Sullivan, J Wang, L Watson, J AF Sampayan, S Caporaso, G Chen, YJ Hawkins, S Holmes, C McCarrick, J Nelson, S Nunnally, W Poole, B Rhodes, M Sanders, D Sullivan, J Wang, L Watson, J GP IEEE TI Development of a compact radiography accelerator using dielectric wall accelerator technology SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We are developing a compact accelerator system primarily intended for pulsed radiography. Design characteristics are an 8 MeV endpoint energy, 2 kA beam current, and a cell gradient of approximately 3 MV/m: overall accelerator length is 2-3 m. Such designs have been made possible with the development of high specific energy dielectrics (> 10J/cm(3)),specialized transmission line designs and multi-gap laser triggered low jitter (< 1 ns) gas switches. In this geometry, the pulse forming lines, switches, and insulator/beam pipe are fully integrated within each cell to form a compact, stand-alone, stackable unit. We detail our research and modeling to date, recent high voltage test results, and the integration concept of the cells into a radiographic system. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Sampayan, S (reprint author), Lawrence Livermore Natl Lab, POB 5508, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1291 EP 1293 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201062 ER PT B AU Campisi, IE AF Campisi, IE CA SNS Collaboration GP IEEE TI Testing of the SNS superconducting cavities and cryomodules SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The superconducting linac for the Spallation Neutron Source is in the process of being commissioned. Eighty-one niobium cavities resonating at 805 MHz are being installed in the SNS tunnel in 11 medium beta (.61) cryomodules each containing 3 cavities and 12 high beta (.81) cryomodules each with 4 cavities. The niobium cavities and cryomodules were designed and assembled at Jefferson Lab to operate at 2.1 K. The Central Helium Liquefier has been tested to 2.1 K but is routinely operated at 4.2 K. At this temperature, 70 of the 81 cavities have been tested, mostly in open loop at 10 pulses per second and at a full pulse length of 1.3 msec. The results indicate that high gradients can be reached even at 4.2 K (average value of 17.8 MV/m) and that operation of the superconducting linac at that temperature may be possible. C1 Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 USA. RP Campisi, IE (reprint author), Oak Ridge Natl Lab, Spallat Neutron Source, POB 2008, Oak Ridge, TN 37831 USA. EM cie@ornl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1294 EP 1298 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201063 ER PT B AU Dobert, S Adolphsen, C Bowden, G Burke, D Chan, J Dolgashev, V Frisch, J Jobe, K Jones, R Lewandowski, J Kirby, R Li, Z McCormick, D Miller, R Nantista, C Nelson, J Pearson, C Ross, M Schultz, D Smith, T Tantawi, S Wang, J Arkan, I Boffo, C Carter, H Gonin, I Khabiboulline, T Mishra, S Romanov, G Solyak, N Funahashi, Y Hayano, H Higashi, N Higashi, Y Higo, T Kawamata, H Kume, T Morozumi, Y Takata, K Takatomi, T Toge, N Ueno, K Watanabe, Y AF Dobert, S Adolphsen, C Bowden, G Burke, D Chan, J Dolgashev, V Frisch, J Jobe, K Jones, R Lewandowski, J Kirby, R Li, Z McCormick, D Miller, R Nantista, C Nelson, J Pearson, C Ross, M Schultz, D Smith, T Tantawi, S Wang, J Arkan, I Boffo, C Carter, H Gonin, I Khabiboulline, T Mishra, S Romanov, G Solyak, N Funahashi, Y Hayano, H Higashi, N Higashi, Y Higo, T Kawamata, H Kume, T Morozumi, Y Takata, K Takatomi, T Toge, N Ueno, K Watanabe, Y GP IEEE TI High gradient performance of NLC/GLC X-band accelerating structures SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB During the past five years, there has been an concerted program at SLAC and KEK to develop accelerator structures that meet the high gradient (65 MV/m) performance requirements for the Next Linear Collider (NLC) and Global Linear Collider (GLC) initiatives. The design that resulted is a 60-cm-long, traveling-wave structure with low group velocity and 150 degree per cell phase advance. It has an average iris size that produces an acceptable short-range Wakefield, and dipole mode damping and detuning that adequately suppresses the long-range Wakefield. More than eight such structures have operated at a 60 Hz repetition rate over 1000 hours at 65 MV/m with 400 ns long pulses, and have reached breakdown rate levels below the limit for the linear collider. Moreover, the structures are robust in that the rates continue to decrease over time, and if the structures are briefly exposed to air, the rates recover to their low levels within a few days. This paper presents a summary of the results from this program, which effectively ended last August with the selection of 'cold' technology for an International Linear Collider (ILC). C1 SLAC, Menlo Pk, CA 94025 USA. RP Dobert, S (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 10 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1299 EP 1301 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201064 ER PT B AU Dolgashev, VA Tantawi, SG Nantista, CD Higashi, Y Higo, T AF Dolgashev, VA Tantawi, SG Nantista, CD Higashi, Y Higo, T GP IEEE TI RF breakdown in normal conducting single-cell structures SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Operating accelerating gradient in normal conducting accelerating structures is often limited by rf breakdown. The limit depends on multiple parameters, including input rf power, rf circuit, cavity shape and material. Experimental and theoretical study of the effects of these parameters on the breakdown limit in full scale structures is difficult and costly. We use 11.4 GHz single-cell traveling wave and standing wave accelerating structures for experiments and modeling of rf breakdown behavior. These test structures are designed so that the electromagnetic fields in one cell mintic the fields in prototype multicell structures for the X-band linear collider. Fields elsewhere in the test structures are significantly lower than that of the single cell. The setup uses matched mode converters that launch the circular TM(01) mode into short test structures. The test structures are connected to the mode launchers with vacuum rf flanges. This setup allows economic testing of different cell geometries, cell materials and preparation techniques with short turn-around time. Simple 2D geometry of the test structures simplifies modeling of the breakdown currents and their thermal effects. C1 SLAC, Menlo Pk, CA 94025 USA. RP Dolgashev, VA (reprint author), SLAC, Menlo Pk, CA 94025 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1305 EP 1309 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201066 ER PT B AU Norem, J Bauer, P Sebastian, J Seidman, DN AF Norem, J Bauer, P Sebastian, J Seidman, DN GP IEEE TI Atom probe tomography studies of rf materials SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We are constructing a facility that combines an atom probe field ion microscope with a multi-element in-situ deposition and surface modification capability. This system is dedicated to if studies and the initial goal will be to understand the properties of evaporative coatings: field emission, bonding, interdiffusion. etc.., to suppress breakdown and dark currents in normal cavities. We also hope to use this system to look more generally at interactions of surface structure and high rf fields. We will present preliminary data on structures relevant to normal and superconducting rf systems. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Norem, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM norem@anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1310 EP 1312 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201067 ER PT B AU Guo, JQ Tantawi, SG AF Guo, JQ Tantawi, SG GP IEEE TI Development of ultra-fast silicon switches for active X-band high power rf compression systems SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In this paper, we present the recent results of our research on the high power ultra-fast silicon RF switches. This switch is composed of a group of PIN diodes on a high purity SOI (silicon on oxide) wafer. The wafer is inserted into a cylindrical waveguide under TE01 mode, performing switching by injecting carriers into the bulk silicon. Our current design use a CMOS compatible process and the device was fabricated at SNF(Stanford Nanofabrication Facility). This design is able to achieve sub-100ns switching time, while the switching speed can be improved further with 3-D device structure and faster circuit. Power handling capacity of the switch is at the level of 10MW. The switch was designed for active X-band RF pulse compression systems - especially for NLC, but it is also possible to be modified for other applications and other frequencies such as L-band. C1 SLAC, Menlo Pk, CA 94025 USA. RP Guo, JQ (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM jqguo@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1316 EP 1318 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201069 ER PT B AU Murdoch, G AF Murdoch, G GP IEEE TI Remote handling in high-power proton facilities SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Design for remote handling of highly activated accelerator components is becoming more prevalent as proton facilities are designed and constructed to provide ever-increasing beam powers. During operation of these facilities it is expected that many components will become activated, consequently mechanical engineering design work must address this issue if components are to be maintained by traditional hands-on methods. These design issues are not new and operating proton facilities around the world have gone through the same process to varying degrees. In this paper we discuss the design and design philosophy of remote handling of active accelerator components, using as examples designs which have been proven at operating facilities, as well as new approaches which are being incorporated into accelerator facilities under construction, such as the Spallation Neutron Source (SNS) and J-PARC. 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 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1324 EP 1328 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201071 ER PT B AU Kirk, HG Ludewig, H Mausner, L Simos, N Thieberger, P McDonald, KT Sheppard, JC Trung, LP Hayato, Y Yoshimura, K AF Kirk, HG Ludewig, H Mausner, L Simos, N Thieberger, P McDonald, KT Sheppard, JC Trung, LP Hayato, Y Yoshimura, K GP IEEE TI Post-irradiation properties of candidate materials for high-power targets SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The desire of the high-energy-physics community for more intense secondary particle beams motivates the development of multi-megawatt, pulsed proton sources. T e targets needed to produce these secondary particle beams must be sufficiently robust to withstand the intense pressure waves arising from the high peak-energy deposition which an intense pulsed beam will deliver. In addition, the materials used for the targets must continue to perform in a severe radiation environment. The effect of the beam-induced pressure waves can be mitigated by use of target materials with high-yield strength and/or low coefficient of thermal expansion (CTE) [1, 2, 3]. We report here first results of an expanded study of the effects of irradiation on several additional candidate materials with high strength (AlBeMet, beryllium, Ti-V6-A14) or low CTE (a carbon-carbon composite, a new Toyota "gum" metal alloy [4], Super-Invar). C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kirk, HG (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM hkirk@bnl.gov NR 5 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1329 EP 1331 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201072 ER PT B AU Galambos, J Chu, C Cousineau, S Danilov, V Patton, J Pelaia, T Shishlo, A Allen, CK AF Galambos, J Chu, C Cousineau, S Danilov, V Patton, J Pelaia, T Shishlo, A Allen, CK GP IEEE TI XAL application programming structure SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB XAL is ail application programming framework used at the Spallation Neutron Source (SNS) project in Oak Ridge. It is written in Java, and provides users with a hierarchal view of the accelerator. Features include database configuration of the accelerator structure, an online envelope model that is configurable from design or five machine values, ail application framework for quick-start GUI development, a scripting interface for algorithm development, and a common toolkit for shared resources. To date, about 25 applications have been written, many of which are used extensively in the SNS beam commissioning activities. The XAL framework and example applications will be discussed. C1 Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 USA. RP Galambos, J (reprint author), Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1335 EP 1339 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201074 ER PT B AU Gibson, DJ Barty, CPJ Betts, SM Crane, JK Jovanovic, I AF Gibson, DJ Barty, CPJ Betts, SM Crane, JK Jovanovic, I GP IEEE TI Laser system for photoelectron and x-ray production in the PLEIADES Compton light source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID CHIRPED-PULSE AMPLIFICATION AB The Picosecond Laser-Electron Interaction for the Dynamic Evaluation of Structures (PLEIADES) facility provides tunable short x-ray pulses with energies of 30140 keV and pulse durations of 0.3 - 5 ps by scattering an intense, ultrashort laser pulse off a 35-75 MeV electron beam. Synchronization of the laser and electron beam is obtained by using a photoinjector gun, and using the same laser system to generate the electrons and the scattering laser. The Ti:Sapphire, chirped pulse amplification based 500 mJ, 50 fs, 810 nm scattering laser and the similar 300 mu J, 5 ps, 266 nm photoinjector laser systems are detailed. Additionally, an optical parametric chirped pulse amplification (OPCPA) system is studied as a replacement for part of the scattering laser front end. Such a change would significantly simplify the set-up the laser system by removing the need for active switching optics, as well as increase the pre-pulse contrast ratio which will be important when part of the scattering laser is used as a pump beam in pump-probe diffraction experiments using the ultrashort tunable x-rays generated as the probe. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Lawrence Livermore Natl Lab, POB 5508, Livermore, CA 94551 USA. EM gibson23@llnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1347 EP 1349 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201109 ER PT B AU Qiang, J AF Qiang, J GP IEEE TI Terascale beam-beam simulations for Tevatron, RHIC and LHC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID COLLIDERS AB In this paper, we report on recent advances in terascale simulations of the beam-beam interaction in Tevatron, RHIC and LHC. Computational methods for self-consistent calculation of beam-beam forces are reviewed. A new method for solving the two-dimensional Poisson equation with open boundary conditions is proposed and tested. This new spectral-finite difference method is a factor of four faster than the widely used FFT based Green function method for beam-beam interaction on axis. We also present applications to the study of antiproton losses during the injection stage at Tevatron, to the study of multiple bunch coherent beam-beam modes at RHIC, and to the study of beam-beam driven emittance growth at LHC. C1 LBNL, Berkeley, CA 94547 USA. RP Qiang, J (reprint author), LBNL, Berkeley, CA 94547 USA. EM jqiang@lbl.gov NR 19 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1354 EP 1358 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201079 ER PT B AU Dohan, DA AF Dohan, DA GP IEEE TI Component/connection/signal modeling of accelerator systems SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This paper presents a pragmatic global approach to data modeling a complex facility such as a particle accelerator. By successively partitioning the facility into collaborating subsystems, one eventually arrives at the component level--the point at which the subsystem is replaceable as a single unit. The fundamental goal of the model is to capture the dynamical relationships (i.e., the connections) that exist among the accelerator components. Components participate in one or more of three connection types: control, housing, and power. These connections are captured in a multi-hierarchical model capable of handling any component of the accelerator, from the macro scale (magnets, power supplies, racks, etc.) to the embedded scale (circuit board components), if desired. The connection approach has been used to model the signal flows between the components via their port connections. The result is a schema for a cable database that provides end-to-end signal tracing throughout the facility. The paper will discuss the multi-hierarchy nature of the model and its success in replacing the "Revision Controlled Drawing" approach to system documentation. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Dohan, DA (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1364 EP 1366 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201081 ER PT B AU Pivi, M Kirby, RE Raubenheimer, T Le Pimpec, F AF Pivi, M Kirby, RE Raubenheimer, T Le Pimpec, F GP IEEE TI Suppressing electron cloud in future linear colliders SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID EMISSION AB Any accelerator circulating positively charged beams can suffer from a build-up of an electron cloud (EC) in the beam pipe. The Cloud develops through ionization of residual gases, synchrotron radiation and secondary electron emission and, when severe, can cause instability, emittance blow-up or loss of the circulating beam. The electron cloud is potentially a luminosity limiting effect for both the Large Hadron Collider (LHC) and the International Linear Collider (ILC). For die ILC positron damping ring, the development of the electron cloud must be suppressed. This paper discusses the state-of-the-art of die ongoing SLAC and international R&D program to study potential remedies. C1 SLAC, Menlo Pk, CA 94025 USA. RP Pivi, M (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM mpivi@slac.stanford.edu NR 26 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1367 EP 1371 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201082 ER PT B AU Molvik, AW Covo, MK Friedman, A Cohen, R Lund, SM Barnard, JJ Bieniosek, F Seidl, P Baca, D Vay, JL Celata, CM Waldron, WL Vujic, JL AF Molvik, AW Covo, MK Friedman, A Cohen, R Lund, SM Barnard, JJ Bieniosek, F Seidl, P Baca, D Vay, JL Celata, CM Waldron, WL Vujic, JL GP IEEE TI Experiments studying desorbed gas and electron clouds in ion accelerators SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Electron clouds and gas pressure rise limit the performance of many major accelerator rings. We are studying these issues experimentally with similar to 1 MeV heavy-ion beams, coordinated with significant efforts in selfconsistent simulation and theory. The experiments use multiple diagnostics, within and between quadrupole magnets, to measure the sources and accumulation of electrons and gas. In support of these studies, we have measured gas desorption and electron emission coefficients for potassium ions impinging on stainless steel targets at angles near grazing incidence. Our goal is to measure the electron particle balance for each source ionization of gas, emission from beam tubes, and emission from an end wall - determine the electron effects on the ion beam and apply the increased understanding to mitigation. We describe progress towards that goal. C1 LLNL, Livermore, CA 94550 USA. RP Molvik, AW (reprint author), LLNL, Livermore, CA 94550 USA. EM molvik@llnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1372 EP 1376 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201083 ER PT B AU Wang, L Wei, J AF Wang, L Wei, J GP IEEE TI Electron-cloud dynamics in high-intensity rings SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Electron cloud is one of the main limitations in high-intensity rings. Electrons generated and accumulated inside the beam's pipe form an "electron cloud" that interacts with the circulating charged-particle beam. With a sizeable number of electrons, these interactions can cause instability, loss of the beam, and the growth of emittance. At the same time, the vacuum pressure will rise due to the desorption of electrons. This presentation gives an overview of the mechanism and dynamics of typical electron multipacting in various magnetic fields, and suggests mitigation measures for different beams. C1 BNL, Upton, NY 11973 USA. RP Wang, L (reprint author), BNL, Upton, NY 11973 USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1377 EP 1381 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201084 ER PT B AU Vay, JL Furman, MA Seidl, PA Cohen, RH Friedman, A Grote, DP Covo, MK Molvik, AW Stoltz, PH Veitzer, S Verboncoeur, JP AF Vay, JL Furman, MA Seidl, PA Cohen, RH Friedman, A Grote, DP Covo, MK Molvik, AW Stoltz, PH Veitzer, S Verboncoeur, JP GP IEEE TI Filling in the roadmap for self-consistent electron cloud and gas modeling SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID BEAMS; ATOMS AB Electron clouds and gas pressure rise limit the performance of many major accelerators. A multi-laboratory effort to understand the underlying physics via the combined application of experiment, theory, and simulation is underway. We present here the status of the simulation capability development, based on a merge of the three-dimensional parallel Particle-In-Cell (PIC) accelerator code WARP and the electron cloud code POSINST, with additional functionalities. The development of the new capability follows a "roadmap" describing the different functional modules, and their inter-relationships, that are ultimately needed to reach self-consistency. Newly developed functionalities include a novel particle mover bridging the time scales between electron and ion motion, a module to generate neutrals desorbed by beam ion impacts at the wall, and a module to track impact ionization of the gas by beam ions or electrons. Example applications of the new capability to the modeling of electron effects in the High Current Experiment (HCX) are given. C1 LBNL, Berkeley, CA 94720 USA. RP Vay, JL (reprint author), LBNL, Berkeley, CA 94720 USA. EM jlvay@lbl.gov NR 18 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1388 EP 1392 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201087 ER PT B AU Shishlo, A Sato, Y Cousineau, S Danilov, V Henderson, S Holmes, J Macek, R Lee, SY AF Shishlo, A Sato, Y Cousineau, S Danilov, V Henderson, S Holmes, J Macek, R Lee, SY GP IEEE TI Self-consistent electron-cloud simulation for long proton bunches SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The results of numerical self-consistent electron-cloud simulations are presented and compared with data from the Proton Storage Ring at LANL. The ORBIT code with a recently developed electron-cloud module has been used. The model includes fully coupled "proton bunch electron cloud" dynamics, a multipacting process model with a realistic secondary emission surface model, and a realistic lattice and injection scheme. The growth rates of proton-bunch transverse instabilities were studied as functions of the beam intensity, RF cavity voltage, external magnetic fields, and number of interaction points between protons and electrons in the model. C1 ORNL, Spallat Neutron Source, Oak Ridge, TN 37830 USA. RP Shishlo, A (reprint author), ORNL, Spallat Neutron Source, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1405 EP 1407 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201091 ER PT B AU Aleksandrov, A AF Aleksandrov, A CA SNS collaboration GP IEEE TI SNS warm linac commissioning results SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source accelerator systems will deliver a 1.0 GeV, 1.4 MW proton beam to a liquid mercury target for neutron scattering research. The staged beam commissioning of the accelerator complex is proceeding as component installation progresses. The Front End, Drift Tube Linac and three of the four Coupled-Cavity Linac modules have been commissioned with beam at ORNL. Results and status of the beam commissioning program are presented. C1 Oak Ridge Natl Lab, SNS Collaborat, Spallat Neutron Source, Oak Ridge, TN 37830 USA. RP Aleksandrov, A (reprint author), Oak Ridge Natl Lab, SNS Collaborat, Spallat Neutron Source, Oak Ridge, TN 37830 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1408 EP 1412 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201092 ER PT B AU Dejus, R AF Dejus, R GP IEEE TI On the issue of phasing of undulators at the Advanced Photon Source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID INSERTION DEVICES; RADIATION; SPRING-8; DESIGN AB Placing two collinear undulators in the 5-m-long straight sections at the Advanced Photon Source (APS) can answer the demand for increased brilliance. Whether longitudinal phasing needs to be taken into account for optimum spectral performance has been investigated. A comprehensive computer simulation study was completed to study the effect of the electron beam emittance, the magnetic field quality of the undulators, and the magnetic field strength (K value) on the spectral performance. For a zero-emittance beam, the radiation spectra exhibit strong interference that depends sensitively on the phase between the undulators. For a realistic APS-emittance beam and beam energy spread, the strong and phase-sensitive interference is substantially smoothed. A summary of the key findings including intensity losses due to unphased undulators is reported in this paper. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Dejus, R (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM dejus@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1449 EP 1451 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201102 ER PT B AU Emery, L AF Emery, L GP IEEE TI Coupling correction of a circularly polarizing undulator at the Advanced Photon Source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The electromagnetic circularly polarizing undulator (CPU) installed at the Advanced Photon Source (APS) storage ring produces skew quadrupole field errors, which were initially corrected by a small skew quadrupole magnet at one end of the device. Because the storage ring is operated at 1% coupling or less, a correction not located at the source inside the CPU is insufficient, as we have confirmed in simulation. Adding a skew coil at the other end of the CPU allows us to make a complete correction of the coupling source in the undulator. Correction set points are determined by APS's general optimizing software with the vertical beam size of an x-ray pinhole image as a readback. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Emery, L (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM emery@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1452 EP 1454 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201103 ER PT B AU Emery, L AF Emery, L GP IEEE TI Optimization and modeling studies for obtaining high injection efficiency at the Advanced Photon Source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In recent years, the optics of the Advanced Photon Source storage ring has evolved to a lower equilibrium emittance (2.5 nm-rad) at the cost of stronger sextupoles and stronger nonlinearities, which have reduced the injection efficiency from the virtual 100% of the high emittance mode. Over the years we have developed a series of optimizations, measurements, and modeling studies of the injection process, which allows us to obtain or maintain low injection losses. The above will be described along with the injection configuration. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Emery, L (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM emery@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1455 EP 1457 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201104 ER PT B AU Grimmer, J Kmak, R AF Grimmer, J Kmak, R GP IEEE TI Parametric mechanical design of new insertion devices at the APS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Three permanent-magnet, planar, hybrid insertion device (ID) designs have recently been completed at the APS. The periods of these undulators are 2.7 cm, 3.0 cm and 3.5 cm with nominal lengths of 2.4 in. Several design studies were performed for the initial 2.7-cm-period device. Then a parametric solid model for the initial device was developed and value engineered to minimize manufacturing, assembly and tuning costs. The model allowed the very rapid design of subsequent devices of similar periods and allowed commonality of several components of the IDs. This design family incorporates a low-cost method of pole retention and registration. Poles are secured by screws in two holes tapped into each pole. Pole location is registered by means of two small dowel pins in mating holes reamed into each pole and a "divider" plate common to the poles and magnets. This divider plate is flexible along its length so shimming behind it can be used to accurately change the height of a pair of poles for tuning. Another feature of the design is modular construction to allow each device to be used full length or shortened to a nominal 2.1 in length for use in APS "canted undulator" sectors. C1 Argonne Natl Lab, APS, Argonne, IL 60439 USA. RP Grimmer, J (reprint author), Argonne Natl Lab, APS, 9700 S Cass Ave, Argonne, IL 60439 USA. EM grimmer@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1458 EP 1460 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201105 ER PT B AU Sasaki, S AF Sasaki, S GP IEEE TI The possibility for a short-period hybrid staggered undulator SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A short-period hybrid-type staggered undulator is proposed. A proper combination of vanadium Permendur (VP) pole and NdFeB magnet provide approximately 40% larger peak field strength than a conventional staggered undulator. The peak field of a 15-mm-period hybrid staggered undulator exceeds 0.8 T at a gap of 6 mm. Also, by using dysprosium as a pole and PrFeB as a magnet at liquid nitrogen temperature (77K), even higher peak field (similar to 0.94 T) can be achieved at the same gap. C1 Argonne Natl Lab, APS, Argonne, IL 60439 USA. RP Sasaki, S (reprint author), Argonne Natl Lab, APS, 9700 S Cass Ave, Argonne, IL 60439 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1461 EP 1463 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201106 ER PT B AU Tremaine, AM Anderson, SG Betts, S Crane, J Gibson, DJ Hartemann, FV Jacob, JS Frigola, P Lim, J Rosenzweig, J Travish, G AF Tremaine, AM Anderson, SG Betts, S Crane, J Gibson, DJ Hartemann, FV Jacob, JS Frigola, P Lim, J Rosenzweig, J Travish, G GP IEEE TI High energy, high brightness x-rays produced by Compton backscattering at the Livermore PLEIADES facility SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID DIFFRACTION; DYNAMICS; TOOL AB PLEIADES (Picosecond Laser Electron Interaction for the Dynamic Evaluation of Structures) produces tunable 30-140 keV x-rays with 0.3-5 ps pulse lengths and up to 10<^>7 photons/pulse by colliding a high brightness electron beam with a hi-h power laser. The electron beam is created by all rf photo-injector system, accelerated by a 120 MeV linac, and focused to 20 mu m with novel permanent magnet quadrupoles. To produce Compton back scattered x-rays, the electron bunch is overlapped with a Ti:Sapphire laser that delivers 500 mJ, 100 fs, Pulses to the interaction point. K-edge radiography at 115 K-eV oil Uranium has verified the an-le correlated energy spectrum inherent in Compton scattering and high-energy tunability of the Livermore source. Current upgrades to the facility will allow laser pumping of targets synchronized to the x-ray Source enabling dynamic diffraction and time-resolved Studies of high Z materials. Near future plans include extending the radiation energies to > 400 keV, allowing for nuclear fluorescence studies of materials. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Tremaine, AM (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1473 EP 1475 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201110 ER PT B AU Kumar, V Kim, KJ AF Kumar, V Kim, KJ GP IEEE TI Calculation of reflection matrix elements of a grating for growing evanescent waves SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID EMISSION AB Reflection matrix elements of a grating play an important role in the study of Smith-Purcell (SP) free-electron lasers (FELs). Especially, the matrix element R(00), which couples the incident co-propagating evanescent wave to the reflected co-propagating evanescent wave, is important for evaluation of the gain of an SP-FEL system [1]. We present a calculation of R(00) for rectangular grating and study its frequency dependence for a given phase velocity of incident wave. For the numerical calculation, we use the modal expansion method and extend it to include waves having slowly varying amplitude. The singularity of R(00) is studied in some detail and we find that it is possible to get a simple formula for the location of the singularity if we choose the eigenmodes of the groove as a basis set as done by Andrews et al. [2]. C1 ANL, Argonne, IL 60439 USA. RP Kumar, V (reprint author), ANL, Argonne, IL 60439 USA. EM vinit@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1482 EP 1484 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201113 ER PT B AU Decker, G Sereno, N AF Decker, G Sereno, N GP IEEE TI Transient generation of short pulses in the APS storage ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A method for obtaining very short pulses using modulation of the accelerating voltage gradient is described and simulation results are given. The idea is to operate the two rf stations with a phase separation adjusted so that the synchronous particle resides on the crest of one of the sources. Phase modulation of the on-crest system at twice the synchrotron frequency induces a longitudinal bunch shape oscillation with significantly reduced bunch length occurring twice each synchrotron period. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Decker, G (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1575 EP 1577 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201144 ER PT B AU Singh, O Decker, G AF Singh, O Decker, G GP IEEE TI Beam stability at the Advanced Photon Source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID APS; FEEDBACK AB The Advanced Photon Source has been in operation since 1996. Since that time, extensive incremental improvements to orbit stabilization systems have been made. This includes the addition of 80 channels of narrowband rf beam position monitors (BPMs), 44 channels of bending magnet photon BPMs, and most recently the inclusion of 16 insertion device photon BPMs into the orbit correction response matrix. In addition, considerable improvements have been made in the area of power supply regulation, both for the main multipole magnets and the steering corrector magnets. The present status of overall performance will be discussed, including long-term pointing stability, reproducibility, and AC beam motion. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Singh, O (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM singh@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1578 EP 1580 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201145 ER PT B AU Yao, CY Sereno, NS Borland, M Grelick, AE Lumpkin, AH AF Yao, CY Sereno, NS Borland, M Grelick, AE Lumpkin, AH GP IEEE TI Results of preliminary tests of PAR bunch cleaning SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A particle accumulator ring (PAR) is used at the Advanced Photon Source (APS) to collect multiple linac bunches and compress them into a 0.3-ns single bunch for booster injection. A 9.77-MHz fundamental and a 117.3-MHz harmonic rf system (RF12) are employed for initial beam capture and bunch-length compression, respectively. Satellite bunches with very low charge form when the phase or loading of the rf systems drift. These satellites cause bunch purity deterioration in the storage ring. Storage ring and booster bunch cleaning has been tried but proved to be difficult due to top-up mode of operation in the storage ring and tune drift in the booster synchrotron. Recently we implemented a PAR bunch cleaning system with tune-modulated harmonic rf knockout. The results showed that the cleaning method is feasible and can achieve the goal of bunch purity better than 10(-8). This report describes the system configuration, test results, and system performance. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Yao, CY (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1581 EP 1583 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201146 ER PT B AU Murphy, JB Bengtsson, J Biscardi, R Blednykh, A Carr, L Casey, W Chouhan, S Dierker, S Haas, E Heese, R Hulbert, S Johnson, E Kao, CC Kramer, S Krinsky, S Pinayev, I Pjerov, S Podobedov, B Rakowsky, G Rose, J Shaftan, T Sheehy, B Skaritka, J Towne, N Wang, JM Wang, XJ Yu, LH AF Murphy, JB Bengtsson, J Biscardi, R Blednykh, A Carr, L Casey, W Chouhan, S Dierker, S Haas, E Heese, R Hulbert, S Johnson, E Kao, CC Kramer, S Krinsky, S Pinayev, I Pjerov, S Podobedov, B Rakowsky, G Rose, J Shaftan, T Sheehy, B Skaritka, J Towne, N Wang, JM Wang, XJ Yu, LH GP IEEE TI NSLS II: The future of the NSLS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The National Synchrotron Light Source at BNL was the first dedicated light source facility and it has now operated for more than 20 years. During this time the user community has grown to more than 2400 users annually. To insure that this vibrant user community has access to the highest quality photon beams, the NSLS is pursuing the design of a new ultra-high brightness (similar to 10(21)) electron storage ring, tailored to the 0.3-20 KeV photon energy range. We present our preliminary design and review the critical accelerator physics design issues. C1 Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. RP Murphy, JB (reprint author), Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. EM jbm@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1584 EP 1586 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201147 ER PT B AU Kramer, SL Bengtsson, J AF Kramer, SL Bengtsson, J GP IEEE TI Dynamic aperture optimization for low emittance light sources SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB State of the art low emittance light source lattices, require small bend angle dipole magnets and strong quadrupoles. This in turn creates large chromaticity and small value of dispersion in the lattice. To counter the high linear chromaticity, strong sextupoles are required which limit the dynamic aperture. Traditional methods for expanding the dynamic aperture use harmonic sextupoles to counter the tune shift with amplitude. This has been successful up to now, but is non-deterministic and limited as the sextupole strength increases, driving higher order nonlinearities. We have taken a different approach that makes use of the tune flexibility of a TBA lattice to minimize the lowest order nonlinearities, freeing the harmonic sextupoles to counter the higher order nonlinearities. This procedure is being used to improve the nonlinear dynamics of the NSLS-II lattice. C1 Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. RP Kramer, SL (reprint author), Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. EM skramer@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1587 EP 1589 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201148 ER PT B AU Shaftan, T Pinayev, I Rose, J Wang, XJ Murphy, JB Johnson, ED Blednykh, A Chouhan, S Kramer, SL Krinsky, S Pjerov, S Podobedov, B Rakowsky, G Tanabe, T Wang, JM Yu, LH AF Shaftan, T Pinayev, I Rose, J Wang, XJ Murphy, JB Johnson, ED Blednykh, A Chouhan, S Kramer, SL Krinsky, S Pjerov, S Podobedov, B Rakowsky, G Tanabe, T Wang, JM Yu, LH GP IEEE TI NSLS-II injection concept SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Currently the facility upgrade project is in progress at the NSLS (at Brookhaven National Laboratory). The goal of the NSLS-II is a 3 GeV ultra- low-emittance storage ring that will increase radiation brightness by three orders of magnitude over that of the present NSLS X-ray ring. The low emittance of the high brightness ring's lattice results in a short lifetime, so that a top-off injection mode becomes an operational necessity. Therefore, the NSLS-II injection system must provide, and efficiently inject, an electron beam at a high repetition rate. In this paper, we present our concept of the NSLS-II injection system and discuss the conditions for, and constraints on, its design. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Shaftan, T (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM shaftan@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1590 EP 1592 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201149 ER PT B AU Shaftan, T Rose, J Pinayev, I Wang, XJ Murphy, JB Johnson, ED AF Shaftan, T Rose, J Pinayev, I Wang, XJ Murphy, JB Johnson, ED GP IEEE TI Design of 3 GeV booster for NSLS-II SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We present preliminary design of full-energy booster for NSLS-II. In the paper we analyse single- and multi-bunch modes of the booster operations. The booster lattice consists of 24 theoretical minimum emittance (TME) cells with two dispersion suppressors. Lattice design, initial design of the magnets and eddy current contribution to the booster chromaticity is briefly discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Shaftan, T (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM shaftan@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1593 EP 1595 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201150 ER PT B AU Nishimura, H Byrne, W AF Nishimura, H Byrne, W GP IEEE TI Simulation and automation of the EEBI test at ALS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Errant Electron Beam interlock (EEBI) is a system that protects the vacuum chamber of the Advanced Light Source (ALS) [1] from synchrotron light damage should the orbit, through a superconducting bend magnet (superbend) [2], become distorted. The EEBI system monitors the vertical beam position on two beam position monitors (BPMs), one upstream and the other downstream, of the superbend and dumps the stored beam if the orbit exceeds preset limits in either offset or angle. Discussed are the modelling studies carried out to determine how to create a large vertical bump, both for performing the test and implementing the automated test software. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Nishimura, H (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. EM H_Nishimura@lbl.gov; WEByrne@lbl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1596 EP 1597 PG 2 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201151 ER PT B AU Green, MA Baynham, E Bradshaw, T Drumm, P Ivanyushenkov, Y Ishimoto, S Cummings, MA Lau, WW Yang, SQ AF Green, MA Baynham, E Bradshaw, T Drumm, P Ivanyushenkov, Y Ishimoto, S Cummings, MA Lau, WW Yang, SQ GP IEEE TI Progress on the mice liquid absorber cooling and cryogenic distribution system SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This report describes the progress made on the design of the cryogenic cooling system for the liquid absorber for the international Muon Ionization Cooling Experiment (MICE). The absorber consists of a 20.7-liter vessel that contains liquid hydrogen (1.48 kg at 20.3 K) or liquid helium (2.59 kg at 4.2 K). The liquid cryogen vessel is located within the warm bore of the focusing magnet for the MICE. The purpose of the magnet is to provide a low beam beta region within the absorber. For safety reasons, the vacuum vessel for the hydrogen absorber is separated from the vacuum vessel for the superconducting magnet and the vacuum that surrounds the RF cavities or the detector. The absorber thin windows separate the liquid in the absorber from the absorber vacuum. The absorber vacuum vessel also has thin windows that separate the absorber vacuum space from adjacent vacuum spaces. Because the muon beam in MICE is of low intensity, there is no beam heating in the absorber. The absorber can use a single 4 K cooler to cool either liquid helium or liquid hydrogen within the absorber. C1 LBNL, Berkeley, CA 94729 USA. RP Green, MA (reprint author), LBNL, Berkeley, CA 94729 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1601 EP 1603 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203039 ER PT B AU Robin, D Byrd, J Fischer, P Heimann, P Kim, DH Kwiatkowski, S Li, DR Sannibale, F Steier, C Wan, WS Wittmer, W Zholents, A AF Robin, D Byrd, J Fischer, P Heimann, P Kim, DH Kwiatkowski, S Li, DR Sannibale, F Steier, C Wan, WS Wittmer, W Zholents, A GP IEEE TI Generation of picosecond X-ray pulses in the ALS using RF orbit deflection SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID MAGNETIZATION DYNAMICS AB A scheme is proposed for producing ps length pulses of x-ray radiation from the Advanced Light Source (ALS) using two RF deflecting cavities. The cavities create vertical displacements of electrons correlated with their longitudinal position in the bunch. The two cavities separated by 180 degrees of vertical phase advance. This allows the vertical kick from one cavity to be compensated by the vertical kick of the other. The location of the cavities corresponds to the end of one straight section and the beginning of the following straight section. Halfway between the cavities a bending magnet source is located. The radiation from the bend can be compressed to similar to 1 ps in duration. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Robin, D (reprint author), Lawrence Berkeley Natl 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1603 EP 1605 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201154 ER PT B AU Byrd, JM Hao, Z Martin, MC Robin, DS Sannibale, F Schoenlein, RW Zholents, AA Zolotorev, MS AF Byrd, JM Hao, Z Martin, MC Robin, DS Sannibale, F Schoenlein, RW Zholents, AA Zolotorev, MS GP IEEE TI Terahertz coherent synchrotron radiation from femtosecond laser modulation of the electron beam at the Advanced Light Source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID X-RAY PULSES; GENERATION AB At the Advanced Light Source (ALS), the 'femtoslicing' beamline is in operation since 1999 for the production of x-ray synchrotron radiation pulses with femtosecond duration. The mechanism used for generating the short x-ray pulses induces at the same time temporary structures in the electron bunch longitudinal distribution with very short characteristic length. Such structures emit intense coherent synchrotron radiation (CSR) in the terahertz frequency range. These CSR pulses were first observed at the ALS, and the measurement of their intensity is now routinely used as a diagnostics for the tune-up of the femtoslicing x-ray experiments. At the same time, these CSR pulses synchronous with the modulating laser represent a potential source of terahertz radiation with very interesting features. Several measurements have been performed for their characterization and in this paper we present an updated description of the experimental results and of their interpretation. In particular, we include more data on the interesting interaction, previously observed at the ALS, between the slicing and the microbunching instability (MBI), where under particular circumstances, the slicing seems to trigger the onset of the instability. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Byrd, JM (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1606 EP 1608 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201155 ER PT B AU Stover, GD Baptiste, KM Barry, W Gath, W Julian, J Kwiatkowski, S Prestemon, S Schlueter, R Shuman, D Steier, C AF Stover, GD Baptiste, KM Barry, W Gath, W Julian, J Kwiatkowski, S Prestemon, S Schlueter, R Shuman, D Steier, C GP IEEE TI Investigations, experiments, and implications for using existing pulse magnets for "topoff" operation at the Advanced Light Source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB ALS top-off mode of operation will require injection of the electron beam from the Booster Ring into the Storage Ring at the full ALS energy level of 1.9 GeV. Currently the Booster delivers a beam at l.5GeV to the Storage Ring where it is then ramped to the full energy and stored for the user operation. The higher Booster beam energy will require the pulse magnets in the Booster and Storage Rings to operate at proportionally higher magnetic gap fields. Our group studied and tested the possible design and installation modifications required to operate the magnets and drivers at "top-off" levels. Our results and experiments show that with minor electrical modifications all the existing pulse magnet systems can be used at the higher energy levels, and the increased operational stresses should have a negligible impact on magnet reliability. Furthermore, simple electrical modifications to the storage ring thick septum will greatly reduce the present level of septum stray leakage fields into the storage ring beam. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Stover, GD (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1609 EP 1611 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201156 ER PT B AU Borland, M Emery, L AF Borland, M Emery, L GP IEEE TI Touschek lifetime and undulator damage in the Advanced Photon Source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Advanced Photon Source (APS) has two insertion devices (IDs) with small-aperture vacuum chambers. The full vertical aperture in these chambers is 5 mm, while the inboard horizontal aperture is 15 mm. These devices suffer significant radiation damage, requiring frequent retuning. We recently hypothesized that the damage resulted from loss of Touschek-scattered particles on the horizontal aperture of the chambers. This results partly from the small size of the aperture and partly from the pattern of the dispersion and beta functions in the low-emittance APS lattice. The horizontal scrapers are located near the middle of the arcs where the dispersion was high in the original lattice, but now, in the low-emittance lattice, the dispersion there is much reduced. Similarly, the dispersion at the IDs was originally zero but is now close to the maximum for the lattice. In this paper, we summarize simulations and experiments that support our hypothesis and discuss remedies. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Borland, M (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM borland@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1621 EP 1623 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201160 ER PT B AU Borland, M Sajaev, V AF Borland, M Sajaev, V GP IEEE TI Simulations of x-ray slicing and compression using crab cavities in the advanced photon source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Recently, Zholents et al. [1] proposed applying to the Advanced Photon Source an x-ray compression scheme based on a pair of crab cavities and asymmetric cut crystals. We have explored the feasibility and potential performance of this scheme through simulation. We used the code elegant to perform 6-D tracking, allowing us to understand the emittance growth and possible cures. We also explored tolerances on alignment, phase, and voltage of the cavities; lifetime effects; tradeoffs between cavity frequency and voltage; and performance with slicing alone instead of compression. Our conclusion is that subpicosecond rms x-ray pulse lengths should be feasible. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Borland, M (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM borland@aps.anl.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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1624 EP 1626 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201161 ER PT B AU Guo, W Harkay, K Yang, B Borland, M Sajaev, V AF Guo, W Harkay, K Yang, B Borland, M Sajaev, V GP IEEE TI Generating picosecond X-ray pulses with beam manipulation in synchrotron light sources SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We show that X-ray pulses one order of magnitude shorter than the electron bunch length call be obtained through synchrobetatron coupling. A 6-ps rms visible light pulse from a 30-ps rms electron bunch was observed using a streak camera. Theory, simulation, and experimental results are presented. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Guo, W (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM weguo@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1627 EP 1629 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201162 ER PT B AU Barry, W Chin, M Robin, D Sannibale, F Scarvie, T Steier, C AF Barry, W Chin, M Robin, D Sannibale, F Scarvie, T Steier, C GP IEEE TI Diagnostic systems plan for the Advanced Light Source top-off upgrade SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Advanced Light Source (ALS) will soon be upgraded to enable top-off operations [1], in which electrons are quasi-confinuously injected to produce constant stored beam current. The upgrade is structured in two phases. First, we will upgrade our injector from 1.5 GeV to 1.9 GeV to allow full energy injection and will start top-off operations. In the second phase, we will upgrade the Booster Ring (BR) with a bunch cleaning system to allow high bunch purity top-off injection. A diagnostics upgrade will be crucial for success in both phases of the top-off project, and our plan for it is described in this paper. New booster ring diagnostics will include updated beam position monitor (BPM) electronics, a tune monitoring system, and a new scraper. Two new synchrotron light monitors and a beam stop will be added to the booster-to-storage ring transfer line (BTS), and all the existing beam current monitors along the accelerator chain will be integrated into a single injection efficiency monitoring a application. A dedicated bunch purity monitor will be installed in the storage ring (SR). Together, these diagnostic upgrades will enable smooth commissioning of the full energy injector and a quick transition to high quality top-off operation at the ALS. C1 LBNL, Berkeley, CA 94720 USA. RP Barry, W (reprint author), LBNL, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1642 EP 1644 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201167 ER PT B AU Steier, C Robin, D Sannibale, F Schoenlein, R Wan, W Wittmer, W Zholents, A AF Steier, C Robin, D Sannibale, F Schoenlein, R Wan, W Wittmer, W Zholents, A GP IEEE TI The new undulator based fs-slicing beamline at the ALS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Femtoslicing beamline at the ALS employs a fs laser beam interacting resonantly with the electron beam in a wiggler. The induced energy spread over the A duration is converted to a transverse displacement by exploiting the storage ring dispersion. The displaced A pulse radiates and produces fs synchrotron radiation. Up to now a regular bending magnet was used as radiator. To improve the flux, a significant upgrade was implemented, replacing the modulator, installing an in-vacuum undulator as new radiator, and installing a higher repeptition rate laser system. The new beamline will provide 100-200 A long pulses of soft and hard x-rays with a repetition rate of 10-40 kHz for experiments concerning ultrafast dynamics in solid state physics, chemistry and biology. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Steier, C (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. EM CSteier@lbl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1645 EP 1647 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201168 ER PT B AU Merrill, FE Morris, CL Folkman, K Harmon, F Hunt, A King, B AF Merrill, FE Morris, CL Folkman, K Harmon, F Hunt, A King, B GP IEEE TI Portable electron radiography system SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The technique of charged particle radiography has been developed and proven with 800 MeV protons at LANSCE and 24 GeV protons at the AGS. Recent work at Los Alamos National Laboratory in collaboration with the Idaho Accelerator Center has extended this diagnostic technique to electron radiography through the development of an inexpensive and portable electron radiography system. This system has been designed to use 30 MeV electrons to radiograph thin static and dynamic systems. The system consists of a 30 MeV electron linear accelerator coupled to a quadrupole lens magnifier constructed from permanent magnet quadrupoles. The design features and operational characteristics of this radiography system are presented as well as the expected radiographic performance parameters. C1 Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Merrill, FE (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. EM fmerrill@lanl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1704 EP 1706 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201188 ER PT B AU Wang, TSF Kwan, TJT AF Wang, TSF Kwan, TJT GP IEEE TI A study of storage ring requirements for an explosive detection system using NRA method SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The technical feasibility of an explosives detection system based on the nuclear resonance absorption (NRA) of gamma rays in nitrogen-rich materials was demonstrated at Los Alamos National Laboratory (LANL) in 1993 by using an RFQ proton accelerator and a tomographic imaging prototype.[1,2] The study is being continued recenty to examine deployment of such an active interrogation system in realistic scenarios. The approach is to use an accelerator and electron-cooling-equipped storage rings(s) to provide the high quality and high current proton beam needed in a practical application. In this work, we investigate the requirements on the storage ring(s) with external gamma-ray-production target for a variant of the airport luggage inspection system considered in the earlier LANL, experiments. Estimations are carried out based on the required inspection throughput, the gamma ray yield, the proton beam emittance growth due to scatters with the photon-production target, beam current limit in the storage ring, and the electron-cooling rate. Studies using scaling and reasonable parameter values indicate that it is possible to use no more than a few storage rings per inspection station in a practical NRA luggage inspection complex having more than ten inspection stations. 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. EM twang@lanl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1707 EP 1709 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201189 ER PT B AU Staples, JW Sessler, A Keller, R Ostroumov, P Chou, WR AF Staples, JW Sessler, A Keller, R Ostroumov, P Chou, WR GP IEEE TI RF-based accelerators for HEDP research SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Accelerator-driven High-Energy Density Physics (HEDP) experiments require typically I nanosecond, I microcoulomb pulses of mass 20 ions accelerated to several MeV to produce eV-level excitations in thin targets, the "warm dense matter" regime. Traditionally the province of induction linacs, RF-based acceleration may be a viable alternative with recent breakthroughs in accelerating structures and high-field compact superconducting solenoids. A reference design for an RF-based accelerator for HEDP research is presented using 15 T solenoids and multiple-gap RF structures configured with multiple parallel beams combined at the target. The beam is ballistically compressed with an induction linac core providing the necessary energy sweep and injected into a plasma-neutralized drift compression channel resulting in a I mm radius beam spot 1 nanosecond long at a thin foil or low-density target. C1 LBNL, Berkeley, CA 94720 USA. RP Staples, JW (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1710 EP 1712 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201190 ER PT B AU Meyer, FW Bannister, ME Hale, JW Johnson, JW Hitz, D AF Meyer, FW Bannister, ME Hale, JW Johnson, JW Hitz, D GP IEEE TI The ORNL Multicharged Ion Research Facility (MIRF) high voltage platform project SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A new 250 kV high voltage platform has been installed at the ORNL Multicharged Ion Research Facility (MIRF) to extend the energy range of multicharged ions available for experimental investigations of their collisional interactions with electrons, atoms, molecules, and solid surfaces. A new all-permanent magnet Electron Cyclotron Resonance (ECR) ion source, designed and fabricated at CEA-Grenoble, was installed on the platform to produce the ion beams of interest. Design details of the new platform and beamlines, and their associated beam transport, are presented below. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Meyer, FW (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM meyerfw@ornl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1713 EP 1715 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201191 ER PT B AU Barnard, JJ Briggs, RJ Callahan, DA Davidson, RC Friedman, A Grisham, L Lee, EP Lee, RW Logan, BG Olson, CL Rose, DV Santhanam, P Sessler, AM Staples, JW Tabak, M Welch, DR Wurtele, JS Yu, SS AF Barnard, JJ Briggs, RJ Callahan, DA Davidson, RC Friedman, A Grisham, L Lee, EP Lee, RW Logan, BG Olson, CL Rose, DV Santhanam, P Sessler, AM Staples, JW Tabak, M Welch, DR Wurtele, JS Yu, SS GP IEEE TI Accelerator and ion beam tradeoffs for studies of Warm Dense Matter SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB One approach for heating a target to "Warm Dense Matter" conditions (similar, for example, to the interiors of giant planets or certain stages in inertial confinement fusion targets), is to use intense ion beams as the heating source (see refs.[6] and [7] and references therein for motivation and accelerator concepts). By consideration of ion beam phase-space constraints, both at the injector, and at the final focus, and consideration of simple equations of state and relations for ion stopping, approximate conditions at the target foil may be calculated. Thus, target temperature and pressure may be calculated as a function of ion mass, ion energy, pulse duration, velocity tilt, and other accelerator parameters. We connect some of these basic parameters to help search the extensive parameter space (including ion mass, ion energy, total charge in beam pulse, beam emittance, target thickness and density. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Barnard, JJ (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RI wurtele, Jonathan/J-6278-2016 OI wurtele, Jonathan/0000-0001-8401-0297 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1743 EP 1745 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201201 ER PT B AU Cameron, P Ben-Zvi, I Dawson, WC Kewisch, J Litvinenko, VN Luo, Y MacKay, WW Montag, C Niedziela, J Ptitsyn, V Satogata, T Schultheiss, C Yakimenko, V AF Cameron, P Ben-Zvi, I Dawson, WC Kewisch, J Litvinenko, VN Luo, Y MacKay, WW Montag, C Niedziela, J Ptitsyn, V Satogata, T Schultheiss, C Yakimenko, V GP IEEE TI Beam-based alignment in the RHIC e-cooling solenoids SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Accurate alignment of the electron and ion beams in the RHIC electron cooling solenoids is crucial for well-optimized cooling. Because of the greatly differing rigidities of the electron and ion beams, to achieve the specified alignment accuracy it is required that transverse magnetic fields resulting from imperfections in solenoid fabrication be down by five orders of magnitude relative to the pure solenoid fields. Shimming the solenoid field to this accuracy might be accomplished by survey techniques prior to operation with beam, or by methods of beam-based alignment. We report on the details of a method of beam-based alignment, as well as the results of preliminary measurements with the ion beam at RHIC. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Cameron, P (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1749 EP 1751 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201203 ER PT B AU Oddo, P Rusek, A Russo, T AF Oddo, P Rusek, A Russo, T GP IEEE TI Linearizing the response of the NSRL synchronous recycling-integrators SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Lawrence Berkeley National Laboratory (LBNL) designed recycling-integrators used for the NASA Space Radiation Laboratory (NSRL) dosimetry feature excellent linearity. However, switching transients in the balancing source add a duty-cycle dependence to the response that manifests as a non-linearity near mid-scale and a slope-change above mid-scale. The onset of this non-linearity limits the typical usable dynamic range. Measurements during a recent run showed that at higher intensities the recycling-integrators would operate in the non-linear region enough to exceed the desired tolerance and over count the dose. This report will show bow a FPGA, which implements the scalars, was used to compensate the non-linearity allowing higher dose-rates by effectively doubling the dynamic range of the dosimetry system. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Oddo, P (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1752 EP 1754 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201204 ER PT B AU Chung, M Davidson, RC Efthimion, P Gilson, EP Majeski, R Startsev, E AF Chung, M Davidson, RC Efthimion, P Gilson, EP Majeski, R Startsev, E GP IEEE TI Development of laser-induced fluorescence diagnostic for the Paul Trap Simulator Experiment SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID BEAM-PROPAGATION AB The Paul Trap Simulator Experiment (PTSX) is a cylindrical Paul trap whose purpose is to simulate the nonlinear dynamics of intense charged particle beam propagation in alternating-gradient magnetic transport systems. For the insitu measurement of the transverse ion density profile in the PTSX device, which is essential for the study of beam mismatch and halo particle production, a laser-induced fluorescence diagnostic system is being developed. Instead of cesium, which has been used in the initial phase of the PTSX experiments, barium has been selected as the preferred ion for the laser-induced fluorescence diagnostic. The installation of the barium ion source and the characterization of the tunable dye laser system are discussed. The design of the collection optics with an intensified CCD camera system is also discussed. Finally, initial test results using the laser-induced fluorescence diagnostic are presented. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Chung, M (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. EM mchung@princeton.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1755 EP 1757 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201205 ER PT B AU Ashmanskas, W Hansen, S Kiper, T Peterson, D AF Ashmanskas, W Hansen, S Kiper, T Peterson, D GP IEEE TI FPGA-based instrumentation for the Fermilab Antiproton Source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We have designed and built low-cost, low-power, Ethernet-based circuit boards to apply DSP techniques to several instrumentation updates in the Fermilab Antiproton Source. Commodity integrated circuits such as direct digital synthesizers, D/A and A/D converters, and quadrature demodulators enable digital manipulation of RF waveforms. A low cost FPGA implements a variety of signal processing algorithms in a manner that is easily adapted to new applications. An embedded microcontroller provides FPGA configuration, control of data acquisition, and command-line interface. A small commercial daughter board provides an Ethernet-based TCP/IP interface between the microcontroller and the Fermilab accelerator control network. The boards are packaged as standard NIM modules. Applications include Low Level RF control for the Debuncher, readout of transfer-line Beam Position Monitors, and narrow-band spectral analysis of diagnostic signals from Schottky pickups. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ashmanskas, W (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM ashmanskas@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1788 EP 1790 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201216 ER PT B AU Cancelo, G James, E Wolbers, S AF Cancelo, G James, E Wolbers, S GP IEEE TI Digital signal processing the tevatron BPM signals SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Beam Position Monitor (TeV BPM) readout system at Fermilab's Tevatron has been updated and is currently being commissioned. The new BPMs use new analog and digital hardware to achieve better beam position measurement resolution. The new system reads signals from both ends of the existing directional stripline pick-ups to provide simultaneous proton and antiproton measurements. The signals provided by the two ends of the BPM pickups are processed by analog band-pass filters and sampled by 14-bit ADCs at 74.3MT4z. A crucial part of this work has been the design of digital filters that process the signal. This paper describes the digital processing and estimation techniques used to optimize the beam position measurement. The BPM electronics must operate in narrow-band and wide-band modes to enable measurements of closed-orbit and turn-by-turn positions. The filtering and timing conditions of the signals are tuned accordingly for the operational modes. The analysis and the optimized result for each mode are presented. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Cancelo, G (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1791 EP 1793 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201217 ER PT B AU Ning, J Tan, CY AF Ning, J Tan, CY GP IEEE TI A hardware transverse beam frequency response simulator SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We built an electronic instrument that can mimic the transverse beam frequency response. The instrument consists of 1) a time delay circuit with an analog-to-digital converter (ADC) which contains a first-in-first-out random assess memory (FIFO RAM) and a digital-to-analog converter (E)AC); 2) a variable phase shifter circuit which is based on an all pass filter with a bandwidth of 25kHz to 30k-Hz and 3) a commutating filter which is a nonlinear band pass filter. With this instrument, we can dynamically adjust the betatron tune, the synchrotron tune, and the chromaticity. Using this instrument, we are able to test other beam systems without using actual beam. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ning, J (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM cytan@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1794 EP 1796 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201218 ER PT B AU Pordes, S Crisp, J Fellenz, B Flora, R Para, A Tollestrup, AV AF Pordes, S Crisp, J Fellenz, B Flora, R Para, A Tollestrup, AV GP IEEE TI Signal processing for longitudinal parameters of the Tevatron beam SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We describe the system known as the Tevatron SBD [1] which is used to provide information on the longitudinal parameters of coalesced beam bunches in the Tevatron. The system has been upgraded over the past year with a new digitizer and improved software. The quantities provided for each proton and antiproton bunch include the intensity, the longitudinal bunch profile, the timing of the bunch with respect to the low-level RF, the momentum spread and the longitudinal emittance. The system is capable of 2 Hz operation and is run at 1 Hz. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Pordes, S (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM stephen@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1797 EP 1799 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201219 ER PT B AU Carneiro, JP Hansen, S Ibrahim, A Shiltsev, V Steimel, J Webber, RC AF Carneiro, JP Hansen, S Ibrahim, A Shiltsev, V Steimel, J Webber, RC GP IEEE TI First results of a longitudinal phase monitor at the TEVATRON SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A digital beam phase monitor has been installed on the TEVATRON ring. This device will be mainly use to diagnose the energy oscillations of each of the 36 x 36 proton and antiproton bunches as well as to study the transient beam loading. The first results obtained from the beam phase monitor is presented on the paper. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Carneiro, JP (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM carneiro@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1800 EP 1802 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201220 ER PT B AU Webber, R AF Webber, R GP IEEE TI Using time separation of signals to obtain independent proton and antiproton beam position measurements around the Tevatron SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Independent position measurement of the counter-circulating proton and antiproton beams in the Tevatron, never supported by the original Tevatron Beam Position Monitor (BPM) system, presents a challenge to upgrading that system. This paper discusses the possibilities and complications of using time separation of proton and antiproton signals at the numerous BPM locations and for the dynamic Tevatron operating conditions. Results of measurements using one such method are presented. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Webber, R (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1803 EP 1805 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201221 ER PT B AU Kutschke, RK Steimel, J Webber, R Wolbers, S AF Kutschke, RK Steimel, J Webber, R Wolbers, S GP IEEE TI Simultaneous position measurements of protons and anti-protons in the Tevatron SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Fermilab is nearing completion of an upgrade to the electronics of the Beam Position Monitor (BPM) system that measures the transverse position of the beams inside the Tevatron collider. A new feature in the upgraded system is the ability, when both protons and anti-protons are present in the Tevatron, to make simultaneous measurements of the closed orbit position of both beam species. This paper will present one of the methods for achieving the simultaneous measurement and will present results from commissioning data, which demonstrate that the system achieves its requirements. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Kutschke, RK (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM kutschke@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1806 EP 1808 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201222 ER PT B AU Merl, R Spickermann, T AF Merl, R Spickermann, T GP IEEE TI Use of a reconfigurable VME module to measure beam energy at the Los Alamos Proton Storage Ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Custom instrumentation has been developed at the Los Alamos Neutron Science Center (LANSCE) to measure the Proton Storage Ring (PSR) beam energy. The PSR accumulates up to 4(.)10(13) protons from the linear accelerator for delivery to a spallation neutron source. The energy of the beam injected into the PSR must be adjusted so that the revolution frequency matches the ring buncher frequency, otherwise a large momentum spread will cause increased losses in high-dispersion areas such as the extraction line. Errors in injected beam energy appear as deviations from the ideal 2.8 MHz revolution frequency. A low-cost reconfigurable VME module developed at LANSCE has been configured to calculate the PSR revolution frequency in real-time. The module connects directly to a raw analog wall current monitor output and uses analog signal conditioning electronics.. an analog to digital converter, field programmable gate arrays (FPGAs) and an embedded floating-point digital signal processor (DSP) to calculate die revolution frequency. The module is compliant with the EPICS based accelerator control system and calculation results are sent through the network to the control room. This is an improvement over die existing method of manually measuring the frequency with an oscilloscope. Accelerator physicists can now simply observe the PSR frequency, which is dependent on beam energy, on a control room display. 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. EM merl@lanl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1809 EP 1811 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201223 ER PT B AU Bieniosek, FM Eylon, S Roy, PK Yu, SS AF Bieniosek, FM Eylon, S Roy, PK Yu, SS GP IEEE TI Optical Faraday cup for heavy ion beams SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We have been using alumina scintillators for imaging beams in heavy-ion beam fusion experiments in 2 to 4 transverse dimensions [1]. The scintillator has a limited lifetime under bombardment by the heavy ion beams. As a possible replacement for the scintillator, we are studying the technique of imaging the beam on a gas cloud. A gas cloud for imaging the beam may be created on a solid hole plate placed in the path of the beam, or by a localized gas jet. It is possible to image the beam using certain fast-quenching optical lines that closely follow beam current density and are independent of gas density. We describe this technique and show preliminary experimental data. This approach has promise to be a new fast beam current diagnostic on a nanosecond time scale. C1 LBNL, Berkeley, CA 94720 USA. RP Bieniosek, FM (reprint author), LBNL, Berkeley, CA 94720 USA. EM fmbieniosek@lbl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1812 EP 1814 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201224 ER PT B AU Montag, C Ahrens, L Thieberger, R AF Montag, C Ahrens, L Thieberger, R GP IEEE TI Tomographic measurement of longitudinal emittance growth due to stripping foils SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB During beam acceleration in the Brookhaven accelerator complex, heavy ions are stripped of their electrons in several steps. Depending on the properties of the stripping foils, this process results in an increased energy spread and longitudinal emittance growth. A tomographic phase space reconstruction technique has been applied to measure the associated emittance growth for different stripping foil materials. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Montag, C (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1815 EP 1817 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201225 ER PT B AU Satogata, T Calaga, R Cameron, P Cerniglia, P Cupolo, J Curcio, A Dawson, WC Degen, C Gullotta, J Mead, J Michnoff, R Russo, T Sikora, R AF Satogata, T Calaga, R Cameron, P Cerniglia, P Cupolo, J Curcio, A Dawson, WC Degen, C Gullotta, J Mead, J Michnoff, R Russo, T Sikora, R GP IEEE TI RHIC BPM system modifications and performance SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The RHIC beam position monitor (BPM) system provides independent average orbit and turn-by-turn (TBT) position measurements. In each ring, there are 162 measurement locations per plane (horizontal and vertical) for a total of 648 BPM planes in the RHIC machine. During 2003 and 2004 shutdowns, BPM processing electronics were moved from the RHIC tunnel to controls alcoves to reduce radiation impact, and the analog signal paths of several dozen modules were modified to eliminate gain-switching relays and improve signal stability. This paper presents results of improved system performance, including stability for interaction region beam-based alignment efforts. We also summarize performance of recently-added DSP profile scan capability, and improved million-turn TBT acquisition channels for 10 Hz triplet vibration, nonlinear dynamics, and echo studies. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Satogata, T (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM satogata@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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1818 EP 1820 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201226 ER PT B AU Hu, M Carcagno, R Krider, J Lorman, E Marchionni, A Pischalnikov, Y Pordes, S Slimmer, D Wilson, PJ Zagel, J AF Hu, M Carcagno, R Krider, J Lorman, E Marchionni, A Pischalnikov, Y Pordes, S Slimmer, D Wilson, PJ Zagel, J GP IEEE TI Beam profile measurement with flying wires at the Fermilab Recycler Ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Flying wires were installed at the Fermilab Recycler Ring for transverse beam profile measurement for both proton and antiproton beams. The following note describes the system configuration, calibration and resolution of the flying wire system, interactions between the wires and the beam, as well as analysis of the transverse beam profile in the presence of a stochastic cooling system. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Hu, M (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM martinhu@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1821 EP 1823 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201227 ER PT B AU Jansson, A Bowden, M Bowie, K Bross, A Dysert, R Fitzpatrick, T Kwarciany, R Lundberg, C Nguyen, H Rivetta, C Slimmer, D Valerio, L Zagel, J AF Jansson, A Bowden, M Bowie, K Bross, A Dysert, R Fitzpatrick, T Kwarciany, R Lundberg, C Nguyen, H Rivetta, C Slimmer, D Valerio, L Zagel, J GP IEEE TI An ionization profile monitor for the Tevatron SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Primarily to study emittance blowup during injection and ramping, an ionization profile monitor has been developed for the Tevatron. It is based on a prototype installed in the Main Injector, although with extensive modifications. In particular, the electromagnetic shielding has been improved, the si anal path has been cleaned up, and provisions have been made for an internal electron source. Due to the good Tevatron vacuum, a local pressure bump is introduced to increase the primary signal, which is then amplified by a microchannel plate and detected on anode strips. For the DAQ, a custom ASIC developed for the CMS experiment is used. It is a combined charge integrator and digitizer, with a sensitivity of a few fC, and a time-resolution that allows single bunch measurement. Digitization is done in the tunnel to reduce noise. Preparations for detector installation were made during the long 2004 shutdown, with the installation of magnets, vacuum chambers, vacuum pumps and cabling. The actual detector will be installated during the fall 2005 shutdown. This paper describes the design of the detector and associated electronics, and presents various bench test results. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Jansson, A (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1824 EP 1826 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201228 ER PT B AU Jansson, A Lebrun, P Volk, JT AF Jansson, A Lebrun, P Volk, JT GP IEEE TI Beta function measurement in the Tevatron using quadrupole gradient modulation SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Early in Run2, there was an effort to compare the different emittatice measurements in the Tevatron (flying wires and synchtotron light) and understand the origin of the observed differences. To measure the beta function at a few key locations near the instruments, air-core quadrupoles were installed. By modulating the gradient of these magnets and measuring the effect on the tune the lattice parameters can be extracted. Initially, the results seem to disagree with with other methods. At the time, the lattice was strongly coupled due to a skew component in the main dipoles, caused by sagging of the cryostat. After a large fraction of the superconducting magnets were shimmed to remove a strong skew quadrupole component, the results now agree with the theoretical values to within 20%. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Jansson, A (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1827 EP 1829 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201229 ER PT B AU Scarpine, VE Lindenmeyer, CW Tassotto, GR Lumpkin, AH AF Scarpine, VE Lindenmeyer, CW Tassotto, GR Lumpkin, AH GP IEEE TI Development of an optical transition radiation detector for profile monitoring of antiproton and proton beams at FNAL SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Optical transition radiation (OTR) detectors are being developed at Fermi National Accelerator Laboratory (FNAL) as part of the collider Run II upgrade program and as part of the NuMI primary beam line. These detectors are designed to measure 150 GeV antiprotons as well as 120 GeV proton beams over a large range of intensities. Design and development of an OTR detector capable of measuring beam in both directions down to beam intensities of similar to 5e9 particles for nominal beam sizes are presented. Applications of these OTR detectors as an on-line emittance monitor for both antiproton transfers and reverse-injected protons, as a Tevatron injection profile monitor, and as a high-intensity beam profile monitor for NuMI are discussed. In addition, different types of OTR foils are being evaluated for operation over the intensity range of similar to 5e9 to 5e13 particles per pulse, and these are described. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Scarpine, VE (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM scarpine@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1830 EP 1832 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201230 ER PT B AU Thurman-Keup, R Lorman, E Meyer, T Pordes, S De Santis, S AF Thurman-Keup, R Lorman, E Meyer, T Pordes, S De Santis, S GP IEEE TI Measurement of the intensity of the beam in the abort gap at the Tevatron utilizing synchrotron light SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This paper discusses the implementation of abort gap beam intensity monitoring at the Tevatron collider at Fermilab. There are two somewhat independent monitors which measure the intensity of the synchrotron light emitted by particles in the abort gaps. One system uses a gated Photomultiplier Tube (PMT) to measure the light intensity, and the other system uses a single lens telescope, gated image intensifier, and Charge Injection Device (CID) carnera, to image the beam. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Thurman-Keup, R (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM keup@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1833 EP 1835 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201231 ER PT B AU Aleksandrov, A Assadi, S Cousineau, S Danilov, V Henderson, S Plum, M Logatchov, P AF Aleksandrov, A Assadi, S Cousineau, S Danilov, V Henderson, S Plum, M Logatchov, P GP IEEE TI Feasibility study of using an electron beam for profile measurements in the SNS accumulator ring. SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The electron beam probe method was suggested for measuring profiles in high power beams. In this method, deflection of a low energy electron beam by the collective field of the high intensity beam is measured. The charge density in the high intensity beam can be restored under certain conditions or estimated by various mathematical techniques. We studied the feasibility of using the electron beam probe for the SNS accumulator ring using computer simulations of the diagnostic setup. Realistic proton beam distributions were used in the simulations. Several profile calculation techniques were explored and the results are reported in this paper. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Aleksandrov, A (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. RI Logachev, Pavel/A-9932-2014 OI Logachev, Pavel/0000-0002-3238-8703 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1839 EP 1841 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201233 ER PT B AU Deibele, C Kurennoy, S AF Deibele, C Kurennoy, S GP IEEE TI Matching BPM stripline electrodes to cables and electronics SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source (SNS) is an accelerator-based neutron source being built at Oak Ridge National Laboratory. The 805-MHz coupled-cavity linac (CCL) accelerates an H(-) beam from 86 to 186 MeV while the 805 MHz superconducting-cavity linac (SCL) accelerates the beam to its final energy of 1 GeV The SNS beam position monitors (BPMs) which are used to measure both position and phase of the beam relative to the master oscillator, have the dual-planed design with four one-end-shorted stripline electrodes. We argue that the BPMs are optimally broadband matched to the cabling and electronics when the geometrical mean of the sum-mode and quadrupole-mode impedances is equal to the dipolemode impedance, and both are equal to the external-line impedance, 50 Ohms. The analytical results, MAFIA and HFSS simulations, wire measurements, and beam measurements that support this statement are presented. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Deibele, C (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1842 EP 1844 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201234 ER PT B AU Stockli, MP Welton, RF AF Stockli, MP Welton, RF GP IEEE TI Emittance scanner optimization for low-energy ion beams SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID GHOST SIGNALS AB Ion beam emittances are normally measured as two-dimensional distributions of the beam current fraction within a narrow window Delta x centered at position coordinate x and a narrow window Delta x' centered at trajectory angle x'. The small fraction of the beam current found within both of these windows causes the measured emittance signals to be sensitive to noise, bias, and other unwanted signals. One example of unwanted signals is slit scattering that is discussed in detail for low-energy ion beams. C1 Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 USA. RP Stockli, MP (reprint author), Oak Ridge Natl Lab, SNS, POB 2008, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1845 EP 1847 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201235 ER PT B AU Bailey, JL Yang, BX Buffington, TW AF Bailey, JL Yang, BX Buffington, TW GP IEEE TI A wire scanner design for electron beam profile measurement in the Linac Coherent Light Source undulator SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Linac Coherent Light Source (LCLS), currently under design, requires beam diagnostic instruments between the magnets in the beam undulator section. Ten wire scanners are planned as one of the primary instruments to characterize electron beam properties. The development of these wire scanners presents several design challenges due to the need for high accuracy and resolution of the wire motion (3-mu m tolerance, typical) and the high intensity of the beam (1 nC, 3400-A peak, over an area of 30-mu m rms radius at 120 Hz). In this paper, we present the technical specification and design criteria for the scanners. We will also present the mechanical design of the UHV-compatible drive and its engineering analysis. Lastly, we present the wire card design and discuss associated thermal and mechanical issues originating from the highly intense x-ray and electron beams. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Bailey, JL (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM jbailey@anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1896 EP 1898 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201252 ER PT B AU Watanabe, T Babzien, M Kusche, K Yakimenko, V AF Watanabe, T Babzien, M Kusche, K Yakimenko, V GP IEEE TI Beam angle measurement using Cherenkov radiation SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A simple beam angle monitor utilizing observation of far-field Cherenkov radiation is being developed. The monitor is independent of beam energy as well as position and requires modest camera sensitivity. The angular resolution is determined by beam scattering in a radiator and diffraction from a finite size radiation source. Numerical analysis shows that the angular resolution with a 100-mu m thickness fused silica radiator is 800 mu rad. The experiment results with 2-mm and 100-mu m thickness fused silica agrees with the numerical result qualitatively, but still small error due to misalignment of optics remains. The possibility of non-destructive measurement is also discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Brookhaven Natl Lab, Upton, NY 11973 USA. NR 5 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1899 EP 1901 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201253 ER PT B AU Pinayev, I Kramer, SL Rose, J Shaftan, TV AF Pinayev, I Kramer, SL Rose, J Shaftan, TV GP IEEE TI Proposed diagnostics for the NSLS-II SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The National Synchrotron Light Source is performing R&D of a new 3 GeV electron storage ring to be used for the facility upgrade [1]. To satisfy the demands for the brightness and stability of the future light source a state-of-the-art diagnostics system is a necessity. We present our preliminary design with focus on the requirements for instrumentation and technical solutions to achieve them. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Pinayev, I (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM pinayev@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1902 EP 1903 PG 2 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201254 ER PT B AU Kroc, TK Burov, AV Bolshakov, TB Shemyakin, A AF Kroc, TK Burov, AV Bolshakov, TB Shemyakin, A GP IEEE TI Electron beam size measurements in a cooling solenoid SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Fermilab Electron Cooling Project [1] requires a straight trajectory and constant beam size to provide effective cooling of the antiprotons in the Recycler. A measurement system was developed using movable appertures and steering bumps to measure the beam size in a 20m long, nearly continuous, solenoid. This paper discusses the required beam parameters, the implimentation of the measurement system and results for our application. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Kroc, TK (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM kroc@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1904 EP 1906 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201255 ER PT B AU Dong, H Freyberger, A Kauffman, S Kaufman, L Musson, J AF Dong, H Freyberger, A Kauffman, S Kaufman, L Musson, J GP IEEE TI Digital beam position monitor for the HAPPEX experiment SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The proposed HAPPEX experiment at CEBAF employs a three cavity monitor system for high precision (1um), high bandwidth (100 kHz) position measurements. This is performed using a cavity triplet consisting of two TM110-mode cavities (one each for X and Y planes) combined with a conventional TM010-mode cavity for a phase and magnitude reference. Traditional systems have used the TM010 cavity output to directly down convert the BPM cavity signals to base band. The multi-channel HAPPEX digital receiver simultaneously I/Q samples each cavity and extracts position using a CORDIC algorithm. The hardware design consists of a RF receiver daughter board and a digital processor motherboard that resides in a VXI crate. The daughter board down converts 1.497 GHz signals from the TM010 cavity and X and Y signals from the TM110 cavities to 3 MHz and extracts the quadrature digital signals. The motherboard processes this data and computes beam intensity and X-Y positions with resolution of 1um, 100 kRz output bandwidth, and overall latency of 1us. The results are available in both the analog and digital format. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Dong, H (reprint author), Jefferson Lab, Newport News, VA 23606 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1910 EP 1912 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201257 ER PT B AU Epps, M Kazimi, R Gueye, P AF Epps, M Kazimi, R Gueye, P GP IEEE TI The general electron induced emission (GENIE) system SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A real time beam diagnostic system is proposed for the Jefferson lab injector region. The Genuine ElectroN Induced Emulator (GENIE) consists of a package that includes both hardware (beam monitoring devices) and software (for 3D or 4D visualization of the beam transport). This beam diagnostic tool uses (very small) scintillating fibers placed in different planes to extract the beam profile, beam position, beam current, and beam emittance in real time. Accuracies in position and angle could be at the sub- mu m and mu rad levels, respectively. The beam current could be reconstructed within a few percent. A combined Geant4/Parmela simulation will be developed for beam optic studies. While Parmela offers the power of beam transport with phase matching capabilities (among others), Geant4 provides secondary particles tracking, as well as 3D & 4D visualization, to name a few. A phase I investigation of GENIE using a 100 keV line in the test lab is discussed in this document. C1 JLab, Newport News, VA 23606 USA. RP Epps, M (reprint author), JLab, Newport News, VA 23606 USA. EM epps@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1913 EP 1915 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201258 ER PT B AU Weber, J Chin, M Doolittle, L Akre, R AF Weber, J Chin, M Doolittle, L Akre, R GP IEEE TI PEP-II transverse feedback electronics upgrade SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The PEP-II B Factory at the Stanford Linear Accelerator Center (SLAC) requires an upgrade of the transverse feedback system electronics. The new electronics require 12-bit resolution and a minimum sampling rate of 238 Msps. A Field Programmable Gate Array (FPGA) is used to implement the feedback algorithm. The FPGA also contains an embedded PowerPC 405 (PPC-405) processor to run control system interface software for data retrieval, diagnostics, and system monitoring. The design of this system is based on the Xitinx (R) ML300 Development Platform, a circuit board set containing an FPGA with an embedded processor, a large memory bank, and other peripherals. This paper discusses the design of a digital feedback system based on an FPGA with an embedded processor. Discussion will include specifications, component selection, and integration with the ML300 design. C1 LBNL, Berkeley, CA 94720 USA. RP Weber, J (reprint author), LBNL, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1916 EP 1918 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201259 ER PT B AU Wilcox, R Staples, JW Holzwarth, R AF Wilcox, R Staples, JW Holzwarth, R GP IEEE TI Optical synchronizations systems for femtosecond X-Ray sources SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In femtosecond pump/probe experiments using short X-Ray and optical pulses, precise synchronization must be maintained between widely separated lasers in a synchrotron or FEL facility. We are developing synchronization systems using optical signals for applications requiring, different ranges of timing error over 100 meter of glass fiber. For stabilization in the hundred femtosecond range a CW laser is amplitude modulated at 1-10 GHz, the signal retroreflected from the far end, and the relative phase used to correct the transit time with a piezoelectric phase modulator. For the sub-10 fsec range the laser frequency itself is upshifted 55 MHz with an acousto-optical modulator, retroreflected, upshifted again and phase compared at the sending end to a 110 MHz reference. Initial experiments indicate less than I fsec timing jitter. To lock lasers in the sub-10 fs range we will lock two single-frequency lasers separated by several teraHertz to a master modelocked fiber laser, transmit the two frequencies over fiber, and lock two comb lines of a slave laser to these frequencies, thus synchronizing the two modelocked laser envelopes. C1 LBNL, Berkeley, CA 94720 USA. RP Wilcox, R (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1919 EP 1921 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201260 ER PT B AU Ischebeck, R Barnes, C Blumenfeld, I Decker, FJ Hogan, M Iverson, RH Krejcik, P Siemann, RH Walz, D Kirby, N Clayton, C Huang, CK Johnson, DK Lu, W Marsh, K Deng, SZ Oz, E AF Ischebeck, R Barnes, C Blumenfeld, I Decker, FJ Hogan, M Iverson, RH Krejcik, P Siemann, RH Walz, D Kirby, N Clayton, C Huang, CK Johnson, DK Lu, W Marsh, K Deng, SZ Oz, E GP IEEE TI Bunch length measurements using coherent radiation SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The accelerating field that can be obtained in a beam-driven plasma wakefield accelerator depends on the current of the electron beam that excites the wake. In the E-167 experiment, a peak current above 10 kA will be delivered at a particle energy of 28 GeV. The bunch has a length of a few ten micrometers and several methods are used to measure its longitudinal profile. Among these, autocorrelation of coherent transition radiation (CTR) is employed. The beam passes a thin metallic foil, where it emits transition radiation. For wavelengths greater than the bunch length, this transition radiation is emitted coherently. Tills amplifies the long-wavelength part of the spectrum. A scanning Michelson interferometer is used to autocorrelate the CTR. However, this method requires the contribution of many bunches to build an autocorrelation trace. The measurement is influenced by the transmission characteristics of the vacuum window and beam splitter. We present here an analysis of materials, as well as possible layouts for a single shot CTR autocorrelator. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Ischebeck, R (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RI Lu, Wei/F-2504-2016 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1925 EP 1927 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201262 ER PT B AU Ischebeck, R Decker, FJ Hogan, M Iverson, RH Krejcik, P Siemann, RH Walz, D Lincoln, M Clayton, CE Huang, CK Lu, W Deng, SZ Oz, E AF Ischebeck, R Decker, FJ Hogan, M Iverson, RH Krejcik, P Siemann, RH Walz, D Lincoln, M Clayton, CE Huang, CK Lu, W Deng, SZ Oz, E GP IEEE TI Resolution of transverse electron beam measurements using optical transition radiation SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In the plasma wakefield acceleration experiment E-167, optical transition radiation is used to measure the transverse profile of the electron bunches before and after the plasma acceleration. The distribution of the electric field from a single electron does not give a point-like distribution on the detector, but has a certain extension. Additionally, the resolution of the imaging system is affected by aberrations. The transverse profile of the bunch is thus convolved with a point spread function (PSF). Algorithms that deconvolve the image can help to improve the resolution. Imaged test patterns are used to determine the modulation transfer function of the lens. From this, the PSF can be reconstructed. The Lucy-Richardson algorithm is used to deconvolute this PSF from test images. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Ischebeck, R (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RI Lu, Wei/F-2504-2016 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1928 EP 1930 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201263 ER PT B AU Corbett, J Limborg-Deprey, C Mok, W Ringwall, A AF Corbett, J Limborg-Deprey, C Mok, W Ringwall, A GP IEEE TI The SPEAR 3 diagnostic beamlines SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB SPEAR 3 has two diagnostic beam lines: an x-ray pinhole camera and a visible/UV laboratory. The pinhole camera images similar to 8 keV dipole radiation on a phosphor screen with a remote computer to capture digital images and a parallel video signal to the control room. The visible/UV beam line features an 8 mm high GlidCop 'cold finger' to remove the x-ray core of the beam. The remaining light is deflected horizontally onto an optical bench where it is focused via reflective (Cassegrain) or refractive optics. The visible beam can be split into branch lines for a variety of experimental applications. This paper describes the experimental set up and projected use of both systems. C1 SLAC, Menlo Pk, CA USA. RP Corbett, J (reprint author), SLAC, Menlo Pk, 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 BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1931 EP 1933 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201264 ER PT B AU Lill, R Pietryla, A Norum, E Lenkszus, F AF Lill, R Pietryla, A Norum, E Lenkszus, F GP IEEE TI Design of the APS RF BPM data acquisition upgrade SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Advanced Photon Source (APS) is a third-generation synchrotron light source in its tenth year of operation. The storage ring employs three different types of beam position monitor (BPM) systems to measure and control beam motion. The monopulse radio frequency (rf) BPM is a broadband (10-MHz) system, which is considered to be the backbone of orbit control. The rf BPM system was designed to measure single-turn and multi-turn beam positions. The rf BPMs are presently suffering from an aging data acquisition system. By replacing only the data acquisition we will revitalize this system for another decade and demonstrate a cost-effective approach to improved beam stability, reliability, and enhanced postmortem capabilities. In this paper we present the design of an eight-channel ADC/digitizer VXI board with a sampling rate of 88 MHz (per channel) and 14-bit resolution coupled with a field-programmable gate array and embedded signal processing. We will discuss the upgrade system specifications, design, and prototype test results. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Lill, R (reprint author), Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. EM blill@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1940 EP 1942 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201267 ER PT B AU Lumpkin, AH Berg, WJ Sereno, NS Yao, CY AF Lumpkin, AH Berg, WJ Sereno, NS Yao, CY GP IEEE TI Initial imaging of 7-GeV electron beams with OTR/ODR techniques at the APS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID DIFFRACTION RADIATION; DIAGNOSTICS AB The development of nonintercepting (NI) diagnostics for beam size continues to be of interest in the accelerator community. In the three rings of the Advanced Photon Source (APS) facility, we use optical and x-ray synchrotron radiation generated as the electron beam transits the dipole magnetic fields as an NI mechanism to image the beam during top-up operations. However, in the straight transport lines an alternate beam-size measurement method is needed. Optical diffraction radiation (ODR) is under investigation to monitor 7-GeV beam size and trajectory in the booster synchrotron-to-storage ring (BTS) beamline during top-up operations. We have performed our initial measurements with an Aluminum blade/mirror that served as an optical transition radiation (OTR) monitor when fully inserted into the beam and as an ODR monitor when the beam passed near the edge. 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. EM lumpkin@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1943 EP 1945 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201268 ER PT B AU Lumpkin, AH Sakamoto, F Yang, BX AF Lumpkin, AH Sakamoto, F Yang, BX GP IEEE TI Dual-sweep streak camera measurements of the APS user beams SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The diverse user community of the Advanced Photon Source (APS) has now evolved to include those who use the time structure of the APS x-ray beams. The APS normally runs with a 24-singlets fill, a hybrid fill with a singlet and eight septuplets, or a 324-singlet fill pattern, In all cases the total stored beam current is 100 mA, with the lattice providing a natural emittance of about 2.5 nm rad. The first two patterns are used with a top-up mode that involves injection of one pulse of similar to 2.5 nC every two minutes into the designated storage ring (SR) bucket. Dual-sweep streak camera measurements (Hamamatsu model C5680) have been performed to characterize the individual and average bunch lengths in the fill patterns. The bunch lengths vary from 25 ps (sigma) in the 324-singlets fill to 50 ps (sigma) when the singlet in the hybrid fill has 7.5 mA. Example streak images of each pattern as well as a development mode will be presented and discussed. 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 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1946 EP 1948 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201269 ER PT B AU Yang, BX Bailey, JL Walters, DR Stein, SJ AF Yang, BX Bailey, JL Walters, DR Stein, SJ GP IEEE TI Design of a high-resolution optical transition radiation imager for the Linac Coherent Light Source undulator SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID MONITOR AB The Linac Coherent Light Source (LCLS), a free-electron x-ray laser, is under design and construction. Its high-intensity electron beam, 3400 A in peak current and 46 TW in peak power, is concentrated in a small area (37 micrometer in rms radius) inside its undulator. Ten optical transition radiation (OTR) imagers are planned between the undulator segments for characterizing the transverse profiles of the electron beam. In this paper, we present the performance requirements and technical specifications of the OTR imagers. We will discuss in detail the arrangement and modeling of the imaging optics, and the mechanical design and analysis of the compact camera module. Through a unique optical arrangement, this imager will achieve a fine resolution (12 micrometer rms or better) over the entire field of view (10 mm x 5 mm). The compact camera module will fit in the limited space available with remote focus adjustment. A digital camera will be used to read out the beam images in a programmable region (5 mm x 0.5 mm) at the full beam repetition rate (120 Hz), or over the entire field at a lower rate (15 Hz). C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Yang, BX (reprint author), Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. EM bxyang@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1949 EP 1951 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201270 ER PT B AU Richardson, R Guethlein, G Falabella, S Chambers, F Raymond, B Weir, J AF Richardson, R Guethlein, G Falabella, S Chambers, F Raymond, B Weir, J GP IEEE TI Time resolved X-ray spot diagnostic SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A diagnostic was developed for the determination of temporal history of an X-ray spot. A pair of thin (0.5 mm) slits image the x-ray spot to a fast scintillator which is coupled to a fast detector, thus sampling a slice of the Xray spot. Two other scintillators/detectors are used to determine the position of the spot and total forward dose. The slit signal is normalized to the dose and the resulting signal is analyzed to get the spot size. The position information is used to compensate for small changes due to spot motion and misalignment. The time resolution of die diagnostic is about 5 ns and measures spots from 0.5 mm to over 3 mm. The theory and equations used to calculate spot size and position are presented, as well as data. The calculations assume a symmetric, Gaussian spot. The spot data is generated by the ETA 11 accelerator, a 2kA, 5.2 MeV, 60 us electron beam focused on a tantalum target. The spot generated is typically about I mm FWHM. Comparisons are made to an X-ray pinhole camera which images the X-ray spot (in 2D) at four time slices. C1 LLNL, Livermore, CA 94550 USA. RP Richardson, R (reprint author), LLNL, Livermore, CA 94550 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1973 EP 1975 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201278 ER PT B AU Degtiarenko, P Dotson, D Popov, V AF Degtiarenko, P Dotson, D Popov, V GP IEEE TI Radiation-hard beam position detector for use in the accelerator dump lines SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A new method of beam position measurement suitable for monitoring high energy and high power charged particle beams in the vicinity of high power beam dumps is presented. We have found that a plate made of Chemical Vapor Deposition (CVD) Silicon Carbide (SiC) [1] has physical properties that make it suitable for such an application. CVD SiC material is a chemically inert, extremely radiation-hard, thermo-resistive semiconductor capable of withstanding working temperatures over 1500 degrees C. It has good thermal conductivity comparable to that of Aluminum, which makes it possible to use it in high-current particle beams. High electrical resistivity of the material, and its semiconductor properties allow characterization of the position of a particle beam crossing Such a plate by measuring the balance of electrical currents at the plate ends. The design of a test device, and first results are presented in the report. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Degtiarenko, P (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 1985 EP 1987 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201282 ER PT B AU Ben-Zvi, I Barton, D Beavis, D Blaskiewicz, M Brennan, JM Burrill, A Calaga, R Cameron, P Chang, X Connolly, R Gassner, DM Grimes, J Hahn, H Hershcovitch, A Hseuh, HC Johnson, P Kayran, D Kewisch, J Lambiase, R Litvinenko, VN McIntyre, G Meng, W Nehring, T Nicoletti, A Pate, D Oerter, B Rank, J Rao, T Roser, T Russo, T Scaduto, J Segalov, Z Smith, K Williams, N Wu, KC Yakimenko, V Yip, K Zaltsman, A Zhao, Y Burger, A Favale, A Holmes, D Cole, M Rathke, J Schultheiss, T Bluem, H Todd, AMM Delayen, JR Funk, W Kneisel, P Phillips, L Preble, JP AF Ben-Zvi, I Barton, D Beavis, D Blaskiewicz, M Brennan, JM Burrill, A Calaga, R Cameron, P Chang, X Connolly, R Gassner, DM Grimes, J Hahn, H Hershcovitch, A Hseuh, HC Johnson, P Kayran, D Kewisch, J Lambiase, R Litvinenko, VN McIntyre, G Meng, W Nehring, T Nicoletti, A Pate, D Oerter, B Rank, J Rao, T Roser, T Russo, T Scaduto, J Segalov, Z Smith, K Williams, N Wu, KC Yakimenko, V Yip, K Zaltsman, A Zhao, Y Burger, A Favale, A Holmes, D Cole, M Rathke, J Schultheiss, T Bluem, H Todd, AMM Delayen, JR Funk, W Kneisel, P Phillips, L Preble, JP GP IEEE TI Extremely high current, high-brightness energy recovery linac SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Next generation light-sources, electron coolers, high-power FELs, Compton X-ray sources and many other accelerators were made possible by the emerging technology of high-power, high-brightness electron beams. In order to get the anticipated performance level of ampere-class currents, many technological barriers are yet to be broken. BNL's Collider-Accelerator Department is pursuing some of these technologies for its electron cooling of RHIC application, as well as a possible future electron-hadron collider. We will describe work on CW, high-current and high-brightness electron beams. This will include a description of a superconducting, laser-photocathode RF gun and an accelerator cavity capable of producing low emittance (about 1 micron rms normalized) one nano-Coulomb bunches at currents of the order of one ampere average. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Ben-Zvi, I (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM ilan@bnl.gov RI Yip, Kin/D-6860-2013; Lambiase, Robert/E-1934-2013; Kayran, Dmitry/E-1876-2013 OI Yip, Kin/0000-0002-8576-4311; Kayran, Dmitry/0000-0002-1156-4384 NR 1 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2009 EP 2011 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201290 ER PT B AU Dillon-Townes, LA Bevins, M Kashy, D Slachtouski, S Lassiter, R Neil, G Shinn, M Gubeli, J Behre, C Douglas, D Waldman, D Biallas, G Munk, L Gould, C AF Dillon-Townes, LA Bevins, M Kashy, D Slachtouski, S Lassiter, R Neil, G Shinn, M Gubeli, J Behre, C Douglas, D Waldman, D Biallas, G Munk, L Gould, C GP IEEE TI Beam transport devices for the 10 kW IR Free Electron Laser at Jefferson Lab SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Beam transport components for the 10kW IR Free Electron Laser (FEL) at Thomas Jefferson National Accelerator Facility (Jefferson Lab) were designed to manage 1) electron beam transport and 2) photon beam transport. An overview of the components will be presented in this paper. The electron beam transport components were designed to address RF heating, maintain an accelerator transport vacuum of 1 X 10(-8) torr, deliver photons to the optical cavity, and provide 50 kW of beam absorption during the energy recovery process. The components presented include a novel shielded bellows, a novel zero length beam clipper, a one decade differential pumping station with a 7.62 cm (3.0") aperture, and a 50 kW beam dump. The photon beam transport components were designed to address the management of photons delivered by the accelerator transport. The optical cavity manages the photons and optical transport delivers the 10 kW of laser power to experimental labs. The optical cavity component presented is a unique high reflector vessel and the optical transport component presented is a turning mirror cassette. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Dillon-Townes, LA (reprint author), Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 23606 USA. EM ladt@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2012 EP 2014 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201291 ER PT B AU Sibley, C Armstrong, D Jones, A Justice, A Thompson, D AF Sibley, C Armstrong, D Jones, A Justice, A Thompson, D GP IEEE TI The SNS machine protection system: Early commissioning results and future plans SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source under construction in Oak Ridge TN has commissioned low power beam up to 187 MeV. The number of MPS inputs is about 20% of the final number envisioned. Start-up problems, including noise and false trips, have largely been overcome by replacing copper with fiber and adding filters as required. Initial recovery time from Machine Protection System (MPS) trips was slow due to a hierarchy of latched inputs in the system: at the device level, at the MPS input layer, and at the operator interface level. By reprogramming the MPS FPGA such that all resets were at the input devices, MPS availability improved to acceptable levels. For early commissioning MPS inputs will be limited to beam line devices that will prohibit beam operation. For later operation, the number of MPS inputs will increase as both software alarms and less intrusive MPS inputs such as steering magnets are implemented. Two upgrades to SNS are on the horizon: a 4 MW upgrade and a second target station. Although these are years away the MPS system as designed should easily accommodate the increase in power and pulse-to-pulse target switching at 120 Hz. C1 Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 USA. RP Sibley, C (reprint author), Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2030 EP 2032 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201298 ER PT B AU Wilinski, M Bellavia, S Glenn, JW Mausner, LF Unger, KL AF Wilinski, M Bellavia, S Glenn, JW Mausner, LF Unger, KL GP IEEE TI Machine protection system for concurrent operation of RHIC and BLIP SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Brookhaven 200MeV linac is a multipurpose machine used to inject low intensity polarized protons for RHIC (Relativistic Heavy Ion Collider), as well as to inject high intensity protons to BLIP (Brookhaven Linac Isotope Producer), a medical isotope production facility. If high intensity protons were injected to RHIC by mistake, administrative radiation limits could be exceeded or sensitive electronics could be damaged. In the past, the changeover from polarized proton to high intensity proton operation has been a lengthy process, thereby never allowing the two programs to run simultaneously. To remedy this situation and allow concurrent operation of RHIC and BLIP, an active interlock system has been designed to monitor current levels in the AGS using two current transformers with fail safe circuitry and associated electronics to inhibit beam to RHIC if high intensity currents are detected. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Wilinski, M (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2033 EP 2035 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201299 ER PT B AU Rusnak, B Hall, JM Shen, S AF Rusnak, B Hall, JM Shen, S GP IEEE TI Rotating aperture deuterium gas cell development for high brightness neutron production SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Work is underway at LLNL to design and build a high-brightness mono-energetic source for fast neutron imaging. The approach being pursued will use a 7-MeV deuterium linac for producing high-energy neutrons via a D(d,n)(3)He reaction. To achieve a high-brightness neutron source, a windowless rotating aperture gas cell approach is being employed. Using a series of close-tolerance rotor and stator plates, a differential pumping assembly was designed and built that contains up to 3 atmospheres of deuterium gas in a 40-mm-long gas cell. Rarefaction of the gas due to beam-induced heating will be addressed by rapidly moving the gas across the beam channel in a cross flow tube. The design and fabrication process was guided by extensive 3D modeling of the hydrodynamic gas flow and structural dynamics of the assembly. Summaries of the modeling results, the fabrication of the rotating aperture system, and initial measurements of gas leakage are presented. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Rusnak, B (reprint author), Lawrence Livermore Natl Lab, POB 5508, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2042 EP 2044 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201302 ER PT B AU Shaw, RW Davis, VA Potter, RN Wilson, LL Feigerle, CS Peretich, ME Liaw, CJ AF Shaw, RW Davis, VA Potter, RN Wilson, LL Feigerle, CS Peretich, ME Liaw, CJ GP IEEE TI Corrugated thin diamond foils for SNSH(-) injection stripping SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We have prepared and tested corrugated, thin diamond foils for use in stripping the SNS H(-) Linac beam. Diamond has shown promise for providing ca. 10X increased lifetime over traditional carbon foils. The preferred foil geometry is 10 to 12 mm by 20 mm at 350 microgram/cm(2), mechanically supported on preferably one, but no more than two, edges. The foils are prepared by chemical vapor deposition (CVD) on a patterned silicon substrate, followed by chemical removal of the silicon. This yields a foil with trapezoidal corrugations to enhance mechanical strength and foil flatness. Both micro- and nano-crystal line diamond foils have been grown. Microwave plasma CVD methods that incorporate high argon gas content were used to produce the latter. Sixteen foils of a variety of characteristics have been tested using the BNL 750 keV RFQ H(-) beam at a current scaled to simulate the energy deposition in the SNS foil, Long foil lifetimes, up to more than 130 hours, have been demonstrated. Characterization of the foils after beam testing indicates creation of sp(2) defects within the ion beam spot. Current efforts are centered on development of corrugation patterns that will enhance flatness of single-edge supported foils. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Shaw, RW (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RI Wilson, Leslie/N-1295-2016 OI Wilson, Leslie/0000-0001-7103-6092 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2045 EP 2047 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201303 ER PT B AU Bellavia, S Kahn, S Kirk, H Ludewig, H Raparia, D Simos, N AF Bellavia, S Kahn, S Kirk, H Ludewig, H Raparia, D Simos, N GP IEEE TI Target and horn cooling for the very long baseline neutrino experiment SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Thermodynamic studies have been performed for the beam target and focusing horn system to be used in a very long baseline neutrino oscillation experiment [1]. A 2mm rms beam spot with power deposition of over 18 KW presents challenging material and engineering solutions to this project. Given that the amount of heat transferred by radiation alone from the target to the horn is quite small, the primary mechanism is heat removal by forced convection in the annular space between the target and the horn. The key elements are the operating temperature of the target, the temperature of the cooling fluid and the heat generation rate in the volume of the target that needs to be removed. These working parameters establish the mass flow rate and velocity of the coolant necessary to remove the generated heat. Several cooling options were explored using a carbon-carbon target and aluminum horn. Detailed analysis, trade studies and simulations were performed for cooling the horn and target with gaseous helium as well as water. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Bellavia, S (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2048 EP 2050 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201304 ER PT B AU Chang, XY Ben-Zvi, I Burrill, A Hulbert, S Johnson, P Kewisch, J Rao, T Smedley, J Segalov, Z Zhao, YX AF Chang, XY Ben-Zvi, I Burrill, A Hulbert, S Johnson, P Kewisch, J Rao, T Smedley, J Segalov, Z Zhao, YX GP IEEE TI Measurement of the secondary emission yield of a thin diamond window in transmission mode SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The secondary emission enhanced photoinjector (SEEP) is a promising new approach to the generation of high-current, high-brightness electron beams. A low current primary electron beam with energy of a few thousand electron-volts strikes a specially prepared diamond window which emits secondary electrons with a current two orders of magnitude higher. The secondary electrons are created at the back side of the diamond and drift through the window under the influence of a strong electrical field. A hydrogen termination at the exit surface of the window creates a negative electron affinity (NEA) which allows the electrons to leave the diamond. An experiment was performed to measure the secondary electron yield and other properties. The results are discussed in this paper.. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Chang, XY (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 1 TC 0 Z9 1 U1 0 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2051 EP 2053 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201305 ER PT B AU Holding, M Murdoch, GR Potter, KG Hammons, CM Lang, B Roseberry, RT AF Holding, M Murdoch, GR Potter, KG Hammons, CM Lang, B Roseberry, RT GP IEEE TI Engineering the SNS RTBT/Target interface for remote handling SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The SNS facility is designed for a 1.4MW 1.0GeV proton beam and the interface region of this beam with the Hg spallation target will be highly activated. This installation is located about fifteen feet below the access floor Fig. 1 and the activity levels in the RTBT/Target interface are sufficiently high to warrant the application of Remote Handling (RH) techniques. The installed components are manufactured from radiation hard materials with serviceability beyond the lifetime of the machine, and all connections and mechanisms have been simplified to allow remote handling. The application of pneumatics to facilitate the assembly of major components and to the operation of moveable diagnostics has produced some unique design solutions. C1 Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 USA. RP Holding, M (reprint author), Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2054 EP 2056 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201306 ER PT B AU Mapes, M Hseuh, HC Rank, J Smart, L Todd, R Weiss, D Hechler, M Ladd, P AF Mapes, M Hseuh, HC Rank, J Smart, L Todd, R Weiss, D Hechler, M Ladd, P GP IEEE TI A summary and status of the SNS ring vacuum systems SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source (SNS) ring is designed to accumulate high intensity protons. Ultrahigh vacuum of 10(-9) Torr is required in the accumulator ring to minimize beam-residual gas ionization. To reduce the secondary electron yield (SEY) and the associated electron cloud instability, the ring vacuum chambers are coated with titanium nitride (TiN). This paper describes the design, fabrication, assembly and vacuum processing of the ring and beam transport line vacuum chambers as well as the associated instrumentation. C1 ORNL, Oak Ridge, TN 37831 USA. RP Mapes, M (reprint author), ORNL, Oak Ridge, TN 37831 USA. EM Mapes@bnl.gov NR 5 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2087 EP 2089 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201317 ER PT B AU Hseuh, HC Mapes, M Smart, LA Todd, R Weiss, D AF Hseuh, HC Mapes, M Smart, LA Todd, R Weiss, D GP IEEE TI Upgrade of RHIC vacuum systems for high luminosity operation SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB With increasing ion beam intensity during recent RHIC operations, rapid pressure rises of several decades were observed at most warm sections and at a few cold sections. The pressure rises are associated with electron multi-pacting, electron stimulated desorption and beam ion induced desorption; and have been one of the major intensity and luminosity limiting factors for RHIC. Improvement of the warm sections has been carried out in the last few years. Extensive in-situ bakes, additional UHV pumping and anti-grazing ridges have been implemented. Several hundred meters of NEG coated beam pipes have been installed and activated. Vacuum monitoring and logging were enhanced. Preventive measures, such as pumping before cool down to reduce monolayer condensates, were also taken to suppress the pressure rises in the cold sections. The effectiveness of these measures in reducing the pressure rises during machine studies and during physics runs are discussed and summarized. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Hseuh, HC (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM hseuh@bnl.gov NR 8 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2090 EP 2092 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201318 ER PT B AU Hseuh, H Blaskiewicz, M He, P Lee, YY Pai, C Raparia, D Todd, R Wang, L Wei, J Weiss, D Henderson, S AF Hseuh, H Blaskiewicz, M He, P Lee, YY Pai, C Raparia, D Todd, R Wang, L Wei, J Weiss, D Henderson, S GP IEEE TI Physical and electromagnetic properties of customized coatings for SNS injection ceramic chambers and extraction ferrite kickers SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In the SNS accumulator ring, ceramic vacuum chambers are used for the 8 injection kickers to avoid shielding of a fast-changing kicker field and to minimize eddy current heating. The inner surface of the ceramic chambers was coated with Cu to reduce the beam coupling impedance and provide passage for beam image current, and a TiN over layer to reduce secondary electron yield. The ferrite surfaces of the 14 extraction kicker modules were also coated with TiN. Customized rnasks were used to produce longitudinal coating strips of 1 cm x 5 cm with similar to 1 mm separation among the strips. The coating methods, the physical and electromagnetic properties of the coatings and the effect to the beam and to the electron cloud build-up are summarized. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Hseuh, H (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM hseuh@bnl.gov NR 10 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2093 EP 2095 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201319 ER PT B AU Todd, R He, P Hseuh, HC Weiss, D AF Todd, R He, P Hseuh, HC Weiss, D GP IEEE TI Summary on titanium nitride coating of SNS ring vacuum chambers SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The inner surfaces of the 248 in Spallation Neutron Source (SNS) accumulator ring vacuum chambers are coated with similar to 100nm of titanium nitride (TiN) to reduce the secondary electron yield (SEY) of the chamber walls. There are approximately 135 chambers and kicker modules, some up to 5m in length and 36cm in diameter, coated with TiN. The coating is deposited by means of reactive DC magnetron sputtering using a cylindrical cathode with internal permanent magnets. This cathode configuration generates a deposition rate sufficient to meet the required production schedule and produces stoichiometric films with good adhesion, low SEY and acceptable outgassing. Moreover, the cathode magnet configuration allows for simple changes in length and has been adapted to coat the wide variety of chambers and components contained within the arcs, injection, extraction, collimation and RF straight sections. Chamber types and quantities as well as the cathode configurations are presented herein. The unique coating requirements of the injection kicker ceramic chambers and the extraction kicker ferrite surface will be emphasized. A brief summary of the salient coating properties is given including the interdependence of SEY as a function of surface roughness and its effect on outgassing. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Todd, R (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM rtodd@bnl.gov NR 6 TC 0 Z9 0 U1 1 U2 4 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2096 EP 2098 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201320 ER PT B AU Weiss, D He, P Hseuh, HC Todd, R AF Weiss, D He, P Hseuh, HC Todd, R GP IEEE TI Development of NEG coating for RHIC experimental beamtubes SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB As RHIC beam intensity increases beyond original scope, pressure rises have been observed in some regions. The luminosity limiting pressure rises are associated with electron multi-pacting, electron stimulated desorption and beam induced desorption. Non-Evaporable Getter (NEG) coated beamtubes have been proven effective to suppress pressure rise in synchrotron radiation facilities. Standard beamtubes have been NEG coated by a vendor and added to many RHIC UHV regions. BNL is developing a cylindrical magnetron sputtering system to NEG coat special beryllium beamtubes installed in RHIC experimental regions. It features a hollow, liquid cooled cathode producing power density of 500W/m and deposition rate of 5000 Angstrom/hr on 7.5cm OD beamtube. The cathode, a titanium tube partially covered with zirconium and vanadium ribbons, is oriented for horizontal coating of 4m long chambers. Ribbons and magnets are arranged to provide uniform sputtering distribution and deposited NEG composition. Vacuum performance of NEG coated tubes was measured. Coating was analyzed with energy dispersion spectroscopy, auger electron spectroscopy and scanning electron microscopy. System design, development, and analysis results are presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Weiss, D (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM dweiss@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2099 EP 2101 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201321 ER PT B AU Chen, A Hanna, B Anderson, T AF Chen, A Hanna, B Anderson, T GP IEEE TI NEG pumping strip inside Tevatron B2 magnets SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Nonevaporable getter (NEG) pumping strips[1][2][3], 6.2-m long, were installed inside four Tevatron 132 magnets to improve the vacuum environment. This established A linear pumping scheme in the long, unbakable vacuum chamber. The total pressure was reduced significantly. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Chen, A (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2102 EP 2104 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201322 ER PT B AU Bane, KLF Stupakov, G AF Bane, KLF Stupakov, G GP IEEE TI Resistive wall wakefield in the LCLS undulator SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE C1 SLAC, Stanford, CA 94309 USA. RP Bane, KLF (reprint author), SLAC, Stanford, CA 94309 USA. NR 10 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2114 EP 2116 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201326 ER PT B AU Drury, M Daly, E Davis, GK Delayen, JR Grenoble, C Hicks, R King, L Plawski, T Powers, T Preble, J Wang, H Wiseman, M AF Drury, M Daly, E Davis, GK Delayen, JR Grenoble, C Hicks, R King, L Plawski, T Powers, T Preble, J Wang, H Wiseman, M GP IEEE TI Overview of SNS cryomodule performance SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Thomas Jefferson National Accelerating Facility (Jefferson Lab) has completed production of 24 Superconducting Radio Frequency (SRF) cryomodules for the Spallation Neutron Source (SNS) superconducting linac. This includes one medium-beta (0.61) prototype, eleven medium-beta and twelve high-P (0.81) production cryomodules. Nine medium-beta cryomodules as well as two high-P cryomodules have undergone complete operational performance testing in the Cryomodule Test Facility at Jefferson Lab. The set of tests includes measurements of maximum gradient, unloaded Q (Q(0)), microphonics, and response to Lorentz forces. The Q(ext)'s of the various couplers are measured and the behavior of the higher order mode couplers is examined. The mechanical and piezo tuners are also characterized. The results of these performance tests will be discussed in this paper. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Drury, M (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2123 EP 2125 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201329 ER PT B AU Bookwalter, V Madre, B Ozelis, JP Reece, CE AF Bookwalter, V Madre, B Ozelis, JP Reece, CE GP IEEE TI The use of integrated electronic data capture and analysis for accelerator construction and commissioning: Pansophy from the SNS towards the ILC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Jefferson Lab has extensively used a proprietary web-based system (Pansophy) that integrates commercial database, data analysis, document archiving and retrieval, and user interface software, as a coherent knowledge management product during the construction of the cryomodules for the SNS Superconducting Linac, providing elements of process and procedure control, data capture and review, and data mining and analysis. With near real-time and potentially global access to production data, process monitoring and performance analyses could be pursued in a timely manner, providing crucial feedback. The extensibility, portability, and accessibility of Pansophy via universally available software components provide the essential features needed in any information and project management system capable of meeting the needs of future accelerator construction efforts requiring an unprecedented level of regional and international coordination and collaboration. 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. EM bookwalt@jlab.org; madre@jlab.org; ozelis@jlab.org; reece@jlab.org NR 5 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2129 EP 2131 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201331 ER PT B AU Rimmer, R Daly, EF Hicks, WR Henry, J Preble, J Stirbet, M Wang, H Wilson, KM Wu, G AF Rimmer, R Daly, EF Hicks, WR Henry, J Preble, J Stirbet, M Wang, H Wilson, KM Wu, G GP IEEE TI Concepts for the JLab Ampere-class CW cryomodule SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We describe the concepts and developments underway at JLab as part of the program to develop a new CW cryomodule capable of transporting Ampere-level beam currents in a compact FEL. Requirements include real-estate gradient of at least 10 MV/m and very strong HOM damping to push BBU thresholds up by two or more orders of magnitude compared to existing designs. Cavity shape, HOM damping, power couplers, tuners etc. are being designed and optimized for this application. Cavity considerations include a large iris for beam halo, low-RF losses, HOM frequencies and Q's, low peak surface fields, field flatness and microphonics. Module considerations include high packing factor, low static heat leak, image current heating of beam-line components, cost and maintainability. This module is being developed for the next generation ERL based high power FELs but may be useful for other applications such as electron cooling, electron-ion colliders, industrial processing etc. C1 JLab, Newport News, VA 23606 USA. RP Rimmer, R (reprint author), JLab, Newport News, VA 23606 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2132 EP 2134 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201332 ER PT B AU Dotson, D Mammosser, J AF Dotson, D Mammosser, J GP IEEE TI Development of a cryogenic radiation detector for mapping radio frequency superconducting cavity field emissions SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Field emissions in a super conducting helium cooled RF cavity and the production of radiation (mostly X-Rays) have been measured externally on cryomodules at Jefferson Lab since 1991. External measurements are limited to radiation energies above 100 keV due to shielding of the stainless steel cryogenic body. To measure the onset of and to map field emissions from a superconducting cavity requires the detecting instrument be inside the shield and within the liquid Helium. Two possible measurement systems are undergoing testing at JLab. A CsI detector array set on photodiodes and an X-Ray film camera with a fixed aperture. Several devices were tested in the cell with liquid Helium without success. The lone survivor, a CsI array, worked but saturated at high power levels due to backscatter. The array was encased in a lead shield with a slit opening set to measure the radiation emitted directly from the cell eliminating a large portion of the backscatter. This is a work in progress and testing should be complete before the PAC 05. The second system being tested is passive. It is a shielded box with an aperture to expose radiation diagnostic film located inside to direct radiation from the cell. Developing a technique for mapping field emissions in cryogenic cells will assist scientists and engineers in pinpointing any surface imperfections for examination. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Dotson, D (reprint author), Jefferson Lab, Newport News, VA 23606 USA. EM dotson@jlab.org NR 0 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2135 EP 2136 PG 2 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201333 ER PT B AU Dotson, D Seidman, D AF Dotson, D Seidman, D GP IEEE TI Beam Loss Ion Chamber System upgrade for experimental halls SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Beam loss Ion Chamber System (BLICS) was developed to protect Jefferson Labs transport lines, targets and beam dumps from a catastrophic "burn through." Range changes and testing was accomplished manually requiring the experiment to be shut down. The new upgraded system is based around an "off the shelf' Programmable Logic Controller located in a single control box supporting up to ten individual detectors. All functions that formerly required an entry into the experimental hall and manual adjustment can be accomplished from the Machine Control Center (MCC). A further innovation was the addition of a High Voltage "Brick" at the detector location. A single cable supplies the required voltage for the Brick and a return line for the ion chamber signal. The read back screens display range, trip point, and accumulated dose for each location. The new system is very cost effective and significantly reduces the amount of lost experimental time. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Dotson, D (reprint author), Jefferson Lab, Newport News, VA 23606 USA. EM dotson@jlab.org NR 0 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2137 EP 2139 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201334 ER PT B AU Deriy, B AF Deriy, B GP IEEE TI Multichannel deflection plates control system for the ALF facility at the APS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A deflection plates control system was developed as part of SPIRIT (Single Photon Ionization / Resonant Ionization to Threshold), a new secondary neutral mass spectrometry (SNMS) instrument that uses tunable vacuum ultraviolet light from the APS ALF (Argonne Linear Free-electron laser) facility for postionization. The system comprises a crate controller with PC104 embedded computer, 32 amplifiers, and two 1-kV power supplies. Thirty-two D/A converters are used to control voltages at the deflection plates within +/- 400V with 100-mV resolution. An algorithm for simultaneous sweeping of up to 16 XY areas with 10-mu s time resolution also has been implemented in the embedded computer. The purpose of the system is to supply potentials to various ion optical elements for electrostatic control of keV primary and secondary ion beams in this SNMS instrument. The control system is of particular value in supplying (1) bipolar potentials for steering ions, (2) multiple potentials for octupole lenses that shape the ion beams, and (3) ramped deflection potentials for rastering the primary ion beam. The system has been in use as part of the SPIRIT instrument at the ALF facility since 2002. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Deriy, B (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 5 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2149 EP 2151 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201338 ER PT B AU Parker, B Anerella, M Escallier, J Harrison, M He, P Jain, A Marone, A Wu, KC Markiewicz, T Maruyama, T Nosochkov, Y Seryi, A AF Parker, B Anerella, M Escallier, J Harrison, M He, P Jain, A Marone, A Wu, KC Markiewicz, T Maruyama, T Nosochkov, Y Seryi, A GP IEEE TI Compact superconducting final focus magnet options for the ILC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The QD0 quadrupole. the final focus magnet closest to the Interaction Point (IP) for the ILC 20 mr crossing angle layout. must provide strong focusing yet be adjustable to accommodate collision energy changes for energy scans and low energy calibration running. It must also be compact to allow disrupted beam and Beamstrahlung coming from the LP to pass outside into an independent instrumented beam line that leads to a high-power beam absorber. In designing QD0 we take advantage of recent BNL experience making direct wind superconducting magnets. Here we review important considerations for the present design, report on progress producing a prototype, describe our compact quadrupole concept in greater detail, and relate this work to other ELC design challenges. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Parker, B (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM parker@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2203 EP 2205 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202007 ER PT B AU Batygin, YK AF Batygin, YK GP IEEE TI Analysis of positron collection in the linear collider SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In the Linear Collider, the positron capture system includes a positron production target, an adiabatic matching device (AMD), and a linac to accelerate positrons up to the injection energy of the positron damping ring (see Fig. 1). Efficiency of the positron collector is defined by the number of positrons accepted into the damping ring. Analysis of the positron collection system is performed using a conventional scheme, where positrons are produced by a high-energy electron beam hitting the high-Z target. The collection system has been optimized to insure high positron capture into the 6-dimensional acceptance of the damping ring. Various parameters affecting the positron capture are analyzed. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Batygin, YK (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2230 EP 2232 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202016 ER PT B AU Nosochkov, Y Moffeit, K Seryi, A Woods, M Arnold, R Oliver, W Parker, B Torrence, E AF Nosochkov, Y Moffeit, K Seryi, A Woods, M Arnold, R Oliver, W Parker, B Torrence, E GP IEEE TI Design of ILC extraction line for 20 MRAD crossing angle SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB One of the two ILC Interaction Regions will have a large horizontal crossing angle which would allow to extract the spent beams in a separate beam line. In this paper, the extraction line design for 20 mrad crossing angle is presented. This beam line transports the primary e(+)/e(-) and beam-strahlung photon beams from the IP to a common dump, and includes diagnostic section for energy and polarization measurements. The optics is designed for a large energy acceptance to minimize losses in the low energy tail of the disrupted beam. The extraction optics, diagnostic instrumentation and particle tracking simulations are described. C1 SLAC, Menlo Pk, CA 94025 USA. RP Nosochkov, Y (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM yuri@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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2233 EP 2235 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202017 ER PT B AU Tenenbaum, P Raubenheimer, TO Wolski, A AF Tenenbaum, P Raubenheimer, TO Wolski, A GP IEEE TI Multi-stage bunch compressors for the International Linear Collider SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We present bunch compressor designs for the International Linear Collider (ILC) which achieve a reduction in RMS bunch length from 6 mm to 0.3 mm via multiple stages of compression, with stages of acceleration inserted between the stages of compression. The key advantage of multi-stage compression is that the maximum RMS energy spread is reduced to approximately 1%, compared to over 3% for a single-stage design. Analytic and simulation studies of the multi-stage bunch compressors are presented, along with performance comparisons to a single-stage system. Parameters for extending the systems to a larger total compression factor are discussed. C1 SLAC, Stanford, CA USA. RP Tenenbaum, P (reprint author), SLAC, Stanford, CA USA. EM quarkpt@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2236 EP 2238 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202018 ER PT B AU Wu, JH Seryi, A Raubenheimer, TO AF Wu, JH Seryi, A Raubenheimer, TO GP IEEE TI Electron-cloud effects in transport lines of a normal conducting linear collider SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In the transport lines of a normal conducting linear collider, the long positron bunch train can generate an electron cloud which can then amplify intra-train offsets. This is a transient effect which is similar to the electron-cloud driven coupled bunch instabilities in a positron storage ring. In this paper, we study this phenomenon analytically. Some criteria on the critical cloud density with respect to given collider parameters are discussed. C1 SLAC, Menlo Pk, CA 94025 USA. RP Wu, JH (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM jhwu@SLAC.Stanford.EDU 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2242 EP 2244 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202020 ER PT B AU Bharadwaj, V Pitthan, R Sheppard, J Vincke, H Wang, JW AF Bharadwaj, V Pitthan, R Sheppard, J Vincke, H Wang, JW GP IEEE TI Heat deposition in positron sources for ILC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In the International Linear Collider (ILC) positron source, multi-GeV electrons or multi-MeV photons impinge on a metal target to produce the needed positrons in the resulting electromagnetic showers. The incoming beam power is hundreds of kilowatts. Various computer programs - such as FLUKA or MARS - can calculate how the incoming beam showers in the target and can track the particle showers through the positron source system. Most of the incoming energy ends up as heat in the various positron source elements. This paper presents results from such calculations and their impact on the design of a positron source for the ILC. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Bharadwaj, V (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2245 EP 2247 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202021 ER PT B AU Jones, RM Miller, RH AF Jones, RM Miller, RH GP IEEE TI Emittance dilution due to dipole mode rotation and coupling in the main linacs of the ILC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The progress of multiple bunches of charged particles down the main L-band linacs of the ELC (International Linear Collider) can be disrupted by wakefields. These wakefields correspond to the electromagnetic fields excited in the accelerating cavities and have both long-range and short-range components. The horizontal and vertical modal components of the wakefield will be excited at slightly different frequencies (the dipole mode frequency degeneracy's are split) due to inevitable manufacturing errors. We simulate the progress of the ILC beam down the collider under the influence of these wakefields. In particular, we investigate the consequences on the final emittance dilution of the beam of coupling of the horizontal to the vertical motion of the beam. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Jones, RM (reprint author), 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2248 EP 2250 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202022 ER PT B AU Jones, RM Baboi, N AF Jones, RM Baboi, N GP IEEE TI Emittance dilution due to many-band long-range dipole wakefields in the International Linear Collider main linacs SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We investigate the emittance dilution that occurs due to long range wakefields in the ILC (International Linear Collider) [1] L-band linacs. In previous simulations [2] we have focussed upon the largest kick factors (proportional to the transverse fields which transversely kick the beam off axis) for the first three pass-bands. Here we supplement these calculations with an additional four bands. We include seven pass-bands in our simulations with the upper dipole frequencies extending a little higher than 4 GHz. Higher order dipole modes in the first three pass-bands are damped by carefully orientating higher order mode couplers at both ends of each cavity. Here we investigate the impact of upper band modes on the beam dynamics. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Jones, RM (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2251 EP 2253 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202023 ER PT B AU Wang, JW Adolphsen, C Bharadwaj, V Bowden, G Dolgashev, V Jones, R Jongewaard, E Lewandoski, J Li, Z Miller, R AF Wang, JW Adolphsen, C Bharadwaj, V Bowden, G Dolgashev, V Jones, R Jongewaard, E Lewandoski, J Li, Z Miller, R GP IEEE TI Studies of room temperature accelerator structures for the ILC positron source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB There are many challenges in the design of the normal-conducting portion of the ILC positron injector system such as achieving adequate cooling with the high RF and particle loss heating, and sustaining high accelerator gradients during millisecond-long pulses in a strong magnetic field. The proposed design for the positron injector contains both standing-wave and traveling-wave L-band accelerator structures for high RF efficiency, low cost and ease of fabrication. This paper presents results from several studies including particle energy deposition for both undulator based and conventional positron sources, cooling system design, accelerator structure optimization, RF pulse heating, cavity frequency stabilization, and RF feed system design. C1 SLAC, Menlo Pk, CA 94025 USA. RP Wang, JW (reprint author), SLAC, Menlo Pk, CA 94025 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2254 EP 2256 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202024 ER PT B AU Pivi, M Raubenheimer, T Ghalam, A Harkay, K Ohmi, K Wanzenberg, R Wolski, A Zimmermann, F AF Pivi, M Raubenheimer, T Ghalam, A Harkay, K Ohmi, K Wanzenberg, R Wolski, A Zimmermann, F GP IEEE TI Single-bunch instability driven by the electron cloud effect in the positron damping ring of the International Linear Collider SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Collective instabilities caused by the formation of an electron cloud (EC) are a potential limitation to the performances of the damping rings for a future linear collider. In this paper, we present recent simulation results for the electron cloud build-up in damping rings of different circumferences and discuss the single-bunch instabilities driven by the electron cloud. C1 SLAC, Menlo Pk, CA 94025 USA. RP Pivi, M (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM mpivi@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2257 EP 2259 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202025 ER PT B AU Emery, L AF Emery, L GP IEEE TI Global optimization of damping ring designs using a multi-objective evolutionary algorithm SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Several damping ring designs for the International Linear Collider have been proposed recently. Some of the specifications, such as circumference and bunch train, are not fixed yet. Designers must make a choice anyway, select a geometry type (dog-bone or circular), an arc cell type (TME or FODO), and optimize linear and nonlinear parts of the optics. The design process includes straightforward steps (usually the linear optics) and some steps not so straightforward (when nonlinear optics optimization is affected by the linear optics). A first attempt at automating this process for the linear optics is reported. We first recognize that the optics is defined by just a few primary parameters (e.g., phase advance per cell) that determine the rest (e.g., quadrupole strength). In addition to the exact specification of circumference, equilibrium emittance, and damping time, there are some other quantities, which could be optimized, that may conflict with each other. A multi-objective genetic optimizer solves this problem by producing a population of best-ranked solutions on a multidimensional surface from which one solution can be chosen by the designer. The application of the NSGA-II optimizer to a damping ring of FODO cells is presented. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Emery, L (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM emery@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2263 EP 2265 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202027 ER PT B AU Mokhov, NV Drozhdin, AI Kostin, MA AF Mokhov, NV Drozhdin, AI Kostin, MA GP IEEE TI Beam collimation and machine-detector interface at the international linear collider SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Synchrotron radiation, beam-gas scattering and beam halo interactions with collimators and other components in the ILC beam delivery system (BDS) would create fluxes of muons and other secondaries which could exceed the tolerable levels at a detector by a few orders of magnitude. It is shown that with a multi-stage collimation system and magnetized iron spoilers which fill the tunnel one can meet the design goals. Results of modeling with the STRUCT [1] and MARS 15 [2] codes of beam loss and energy deposition effects are presented in this paper. We focus on the collimation system and mask performance optimization, short- and long-term survivability of the critical components (spoilers, absorbers and magnets), dynamic heat loads and radiation levels in magnets and other components., and machine-related backgrounds in collider detectors. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Mokhov, NV (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM mokhov@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2266 EP 2268 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202028 ER PT B AU Neuffer, D AF Neuffer, D GP IEEE TI Bunching for shorter damping rings for the ILC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A variant rearrangement of the bunch trains for the ILC that enables much shorter damping rings is presented. In a particular example the similar to 2820 bunches are regrouped into similar to 550 subtrains of five adjacent bunches. These subtrains are extracted from the damping rings at similar to 1.8 mu s intervals, obtaining the 1ms macrobunch length of the baseline TESLA collider scenario. If the baseline damping rf frequency is 325 MHz and the kicker rise and fall times are similar to 20 ns, a ring circumference of similar to 5.8km is required. Variations of the scheme could easily reduce the circumference to similar to 4km, and faster kickers could reduce it even further. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Neuffer, D (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM neuffer@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2269 EP 2271 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202029 ER PT B AU Xiao, A Emery, L AF Xiao, A Emery, L GP IEEE TI Characterization of a 6-km damping ring for the international linear collider SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Several damping ring designs for the International Linear Collider (ILC) have been proposed recently [1]. One particular design has a circumference of similar to 6 km (hoping to take advantage of future kicker technology advances) using TME arc cells and 77 in of 2 T wigglers. In this paper, we report beam dynamics characterizations and optimizations for this design. We used the accelerator code elegant [2] for matching and tracking and a 100-CPU Linux cluster to provide high throughput. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Xiao, A (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM xiaoam@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2272 EP 2274 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202030 ER PT B AU Wolski, A Byrd, J Bates, D AF Wolski, A Byrd, J Bates, D GP IEEE TI Simulations of resistive-wall instability in the ILC damping rings SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Options being considered for the damping rings for the International Linear Collider (ILC) include lattices with circumferences of around 16 kill. The circumference, beam current and beam energy place the damping rings in a regime where resistive-wall instability is a concern, particularly as there are very demanding tolerances on the bunch-to-bunch jitter. Generally, it is possible to make good analytical estimates of the coupled-bunch growth rates in a storage ring, but particular features of the damping rings make it desirable to study the coupled-bunch instabilities using simulations. We present the results of simulations (including a bunch-by-bunch feedback system) of the transverse instabilities using a detailed lattice model. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Wolski, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. EM awolski@lbl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2275 EP 2277 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202031 ER PT B AU Wolski, A Cai, Y AF Wolski, A Cai, Y GP IEEE TI Achieving large dynamic aperture in the ILC damping rings SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Damping Rings for the International Linear Collider have challenging requirements for the acceptance, because of the high average injected beam power and the large beam produced from the positron source. At the same time, the luminosity goals mean that the natural emittance must be very small, and this makes it particularly difficult to achieve a good dynamic aperture. We describe design approaches and lattice designs that meet the emittance specification and have very promising dynamic aperture. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Wolski, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. EM awolski@lbl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2278 EP 2280 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202032 ER PT B AU Kayran, D Ben-Zvi, I Calaga, R Chang, XY Kewisch, J Litvinenko, V AF Kayran, D Ben-Zvi, I Calaga, R Chang, XY Kewisch, J Litvinenko, V GP IEEE TI Optics for high brightness and high current ERL project at BNL SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB An energy recovery linac (ERL), under development at Brookhaven National Laboratory [1,2], will push ERLs further towards high current and high brightness beams. This R&D ERL will operate in two modes: a high current mode and a high charge mode. In this paper we present a lattice of the machine and PARMELA simulations from the cathode to the beam dump. We discuss the design considerations and present main parameters for various modes of operation. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kayran, D (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM dkayran@bnl.gov RI Kayran, Dmitry/E-1876-2013 OI Kayran, Dmitry/0000-0002-1156-4384 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2323 EP 2325 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202047 ER PT B AU Hutton, A AF Hutton, A GP IEEE TI Doubling the intensity of an ERL based light source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A light source based on an Energy Recovered Linac (ERL) [1] consists of a superconducting linac and a transfer line that includes wigglers and undulators to produce the synchrotron light. The transfer line brings the electrons bunches back to the beginning of the linac so that their energy can be recovered when they traverse the linac a second time, lambda/2 out of phase. There is another interesting condition when the length of the transfer line is (n +/- 1/4) lambda. In this case, the electrons drift through on the zero RF crossing, and make a further pass around the transfer line, effectively doubling the circulating current in the wigglers and undulators. On the third pass through the linac, they will be decelerated and their energy recovered. The longitudinal focusing at the zero crossing is a problem, but it can be canceled if the drifting beam sees a positive energy gradient for the first half of the linac and a negative gradient for the second half (or vice versa). This paper presents a proposal to use a double chicane at the center of the linac to provide this focusing inversion for the drifting beam while leaving the accelerating and decelerating beams on crest. C1 Jefferson Lab, Newport News, VA 23693 USA. RP Hutton, A (reprint author), Jefferson Lab, Newport News, VA 23693 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2326 EP 2328 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202048 ER PT B AU Huang, Z Stupakov, G AF Huang, Z Stupakov, G GP IEEE TI Free electron lasers with slowly varying beam and undulator parameters SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The performance of a free electron lasers (FEL) is affected when the electron beam energy varies alone the undulator as would be caused by vacuum pipe wakefields and/or when the undulator strength parameter is tapered in the small signal regime until FEL saturation. In this paper, we present a self-consistent theory of FELs with slowly-varying beam and undulator parameters. A general method is developed to apply the WKB approximation to the beam-radiation system by employing the adjoint eigenvector that is orthogonal to the eigenfunctions of the coupled Maxwell-Vlasov equations. This method may be useful for other slowly varying processes in beam dynamics. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Huang, Z (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2335 EP 2337 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202051 ER PT B AU Limborg-Deprey, C Dowell, DH Schmerge, J AF Limborg-Deprey, C Dowell, DH Schmerge, J GP IEEE TI Diagnostics for the LCLS photoinjector beamline SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Two spectrometers have been added to the LCLS photoinjector beamline. The first one will be located close to the exit of the Photoinjector RF gun. With this diagnostic, we will measure beam energy, energy spread (correlated and uncorrelated), possibly deleterious structure in the longitudinal phase space induced by longitudinal space charge force, and slice thermal emittance... This extensive characterization of the 5MeV electron bunch will be made possible by combining this spectrometer with other diagnostics (YAG screens and Cerenkov Radiator). A second spectrometer located at the end of the beamline has been designed to characterize the 6 dimensional phase space of the 135MeV beam to be injected in the main accelerator. At that second spectrometer station, we will measure energy, energy spread (correlated and uncorrelated), longitudinal phase space, slice emittances... Those last two measurements require using this spectrometer in combination with the transverse RF deflecting cavity and with the quadrupole scan emittance station. The designs of these two spectrometers have been supported by simulations from MAD and PARMELA. C1 SLAC, Menlo Pk, CA 94025 USA. RP Limborg-Deprey, C (reprint author), SLAC, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA. EM limborg@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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2338 EP 2340 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202052 ER PT B AU Litvinenko, VN Ben-Zvi, I Beavis, D Blaskiewicz, M Brennan, JM Burrill, A Calaga, R Cameron, P Chang, X Connolly, R Gassner, DM Hahn, H Hershcovitch, A Hseuh, HC Johnson, PD Kayran, D Kewisch, J Lambiase, R Mahler, G McIntyre, G Meng, W Nehring, TC Nicoletti, A Oerter, B Pate, D Rank, J Roser, T Russo, T Scaduto, J Smith, KS Srinivasan-Rao, T Williams, NW Wu, KC Yakimenko, V Yip, K Zaltsman, A Zhao, Y Bluem, HP Burger, A Cole, M Favale, A Holmes, D Rathke, J Schultheiss, T Todd, A Delayen, J Funk, W Phillips, L Preble, J AF Litvinenko, VN Ben-Zvi, I Beavis, D Blaskiewicz, M Brennan, JM Burrill, A Calaga, R Cameron, P Chang, X Connolly, R Gassner, DM Hahn, H Hershcovitch, A Hseuh, HC Johnson, PD Kayran, D Kewisch, J Lambiase, R Mahler, G McIntyre, G Meng, W Nehring, TC Nicoletti, A Oerter, B Pate, D Rank, J Roser, T Russo, T Scaduto, J Smith, KS Srinivasan-Rao, T Williams, NW Wu, KC Yakimenko, V Yip, K Zaltsman, A Zhao, Y Bluem, HP Burger, A Cole, M Favale, A Holmes, D Rathke, J Schultheiss, T Todd, A Delayen, J Funk, W Phillips, L Preble, J GP IEEE TI High current energy recovery linac at BNL SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We present the design and parameters of an energy recovery linac (ERL) facility, which is under construction in the Coll ider-Accelerator Department at BNL. This R&D facility has the goal of demonstrating CW operation of an ERL with an average beam current in the range of 0.1 - 1 ampere and with very high efficiency of energy recovery. The possibility of a future upgrade to a two-pass ERL is also being considered. The heart of the facility is a 5-cell 703.75 MHz super-conducting RF linac with strong Higher Order Mode (HOM) damping. The flexible lattice of the ERL provides a test-bed for exploring issues of transverse and longitudinal instabilities and diagnostics of intense CW electron beams. This ERL is also perfectly suited for a far-IR FEL. We present the status and plans for construction and commissioning of this facility. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Litvinenko, VN (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM vl@bnl.gov RI Yip, Kin/D-6860-2013; Lambiase, Robert/E-1934-2013; Kayran, Dmitry/E-1876-2013 OI Yip, Kin/0000-0002-8576-4311; Kayran, Dmitry/0000-0002-1156-4384 NR 13 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2347 EP 2349 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202055 ER PT B AU Litvinenko, VN Ben-Zvi, I AF Litvinenko, VN Ben-Zvi, I GP IEEE TI Potential use of eRHIC's 10-to-20 GeV ERL for FELs and light sources SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB One of the designs of a future electron-hadron collider, eRHIC, is based on a 5-10 GeV high current energy-recovery linac (ERL) with possible extension of its energy to 20 GeV. This ERL will operate with high brightness electron beams, which naturally match requirements for X-ray FELs and other next generation light sources. In this paper we discuss possible scenarios of using the eRHIC ERL in parasitic and dedicated mode for FELs. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Litvinenko, VN (reprint author), Brookhaven Natl Lab, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2350 EP 2352 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202056 ER PT B AU Yang, BX AF Yang, BX GP IEEE TI High-resolution undulator measurements using angle-integrated spontaneous radiation SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Linac Coherent Light Source (LCLS) is a fourth-generation light source. Its proper operation requires a stringently controlled undulator field. The tolerance for the field parameter K is less than 1.5 x 10(-4) for all thirty-three undulator segments totaling 112 meters. The fluctuation of the electron energy (similar to 0.05%) presents a serious challenge to measurement techniques based on electron or x-ray beams. We show that the steep spectral feature in the angle-integrated undulator radiation can be used to measure the field of the undulator one segment at a time. With simultaneous measurement of electron beam charge and energy shot-by-shot, the K-parameter can be determined with required accuracy. We also propose a differential measurement technique that makes use of the radiation intensities from two undulator segments. When the x-ray beams emitted from the two undulator segments are separated but allowed to pass through the same monochromator, the two beam intensities will change almost identically with the change of many electron beam parameters. As a result, the intensity difference becomes a very sensitive and reliable measure for the difference in the fields of the two undulators. Numerical simulations show that a resolution in the range of Delta K/K similar to 10(-5) can be achieved. C1 Argonne Natl Lab, APS, Argonne, IL 60439 USA. RP Yang, BX (reprint author), Argonne Natl Lab, APS, 9700 S Cass Ave, Argonne, IL 60439 USA. EM bxyang@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2353 EP 2355 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202057 ER PT B AU Penn, G Zholents, AA AF Penn, G Zholents, AA GP IEEE TI Technique for the generation of attosecond X-ray pulses using an FEL SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We describe a technique for the generation of an isolated burst of X-ray radiation with a duration of similar to 100 attoseconds in a free electron laser (FEL) employing self-amplified spontaneous emission. Our scheme relies on an initial interaction of the electron beam with an ultra-short laser pulse in a one-period wiggler followed by compression in a dispersive section. The result of this interaction is to create a sub-femtosecond slice of the electron beam with enhanced growth rates for FEL amplification. After many gain lengths through the FEL undulator, the X-ray output from this slice dominates the radiation of the entire bunch. We consider the impact of various effects on the efficiency of this technique. Different configurations are considered in order to realize various timing structures for the resulting radiation. C1 LBNL, Berkeley, CA 94720 USA. RP Penn, G (reprint author), LBNL, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2362 EP 2364 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202060 ER PT B AU Emma, P Huang, Z Wu, J AF Emma, P Huang, Z Wu, J GP IEEE TI Weak FEL gain detection with a modulated laser-based beam heater SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB For an x-ray free-electron laser (FEL) such as the LCLS, the FEL gain signal is accompanied by spontaneous radiation with a significant power level. Detecting the weak FEL gain among the large spontaneous background in the early stage of the exponential growth or for a low quality electron beam is important in commissioning the FEL. In this paper, we describe a simple "lock-in" method of weak FEL gain detection, suggested by K. Robinson, accomplished by slowly modulating the laser power of a designated beam heater that controls the local energy spread of the electron beam. We present numerical modelling that shows the effectiveness of this method and discuss its implementation in the LCLS. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Emma, P (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2371 EP 2373 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202063 ER PT B AU Kahn, SA Diwan, MV AF Kahn, SA Diwan, MV GP IEEE TI Spectrum from the proposed BNL very long baseline neutrino facility SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This paper calculates the neutrino flux that would be seen at the far detector location for the proposed BNL Very Long Baseline Neutrino Facility. The far detector is assumed to be located at an underground facility in South Dakota 2540 km from BNL. The neutrino beam facility uses a 1 MW upgraded AGS to provide an intense proton beam on the target and a magnetic horn to focus the secondary pion beam. This paper will examine the sensitivity of the neutrino flux at the far detector to the positioning of the horn and target so as to establish alignment tolerances for the neutrino system. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kahn, SA (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2409 EP 2411 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202076 ER PT B AU Johnstone, C Bross, A Rakhno, I AF Johnstone, C Bross, A Rakhno, I GP IEEE TI MUCOOL test area at Fermilab SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A new experimental area designed to develop, test and verify muon ionization cooling apparatus using the 400-MeV Fermilab Linac proton beam began construction in spring, 2002. This area will be used initially for cryogenic tests of liquid-hydrogen absorbers for the MUCOOL R&D program and, later, for high-power beam tests of these absorbers and other prototype muon-cooling apparatus. The experimental scenarios being developed for muon facilities involve collection, capture, and cooling of large-emittance, high-intensity muon beams--similar to 1013 unions at a repetition rate of 15Hz, so that conclusive tests of the apparatus require full Linac: beam, or 1.6 x 1013 p at 15 Hz. To support the muon cooling facility, a new primary beamline will divert beam from the Linac to the test facility. Located southwest of Wilson Hall between the Linac berm and parking lot, implementation of the facility and associated beamline takes advantage of civil construction and resources that remain from the 400-MeV Linac Upgrade Project. The design concept for the MuCool facility is taken from an earlier proposal[1], but modifications to the existing proposal were necessary to accommodate high-intensity beam, cryogenics, and the increased scale of the cooling experiments. This paper reports on the initial low-intensity (Phase I) implementation of the MuCool Test Area (MTA). C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Johnstone, C (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM cjj@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2412 EP 2414 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202077 ER PT B AU Johnstone, C Berz, M Makino, K AF Johnstone, C Berz, M Makino, K GP IEEE TI Linear quadrupole cooling channel for a neutrino factory SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Staging and optimization in the design of a Neutrino Factory are critically dependent on the choice and format of accelerator. Possibly the simplest, lowest-cost scenario is a nonscaling FFAG (Fixed-Field Alternating Gradient) machine coupled to a linear (no bending) transverse cooling channel constructed from the simplest quadrupole lens system, a FODO cell. In such a scenario, transverse cooling demands are reduced by a factor of 4 and no longitudinal cooling is required relative to acceleration using a Recirculating Linac (RLA). Detailed simulations further show that a quadrupole-based channel cools efficiently and over a momentum range which is well-matched to FFAG acceleration. Details and cooling performance for a quadrupole channel are summarized in this work. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Johnstone, C (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM cjj@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2415 EP 2417 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202078 ER PT B AU Tatum, BA Beene, JR AF Tatum, BA Beene, JR GP IEEE TI Holifield radioactive ion beam facility development and status SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Holifield Radioactive Ion Beam Facility (HRIBF) is a national user facility dedicated to nuclear structure, reactions, and nuclear astrophysics research with radioactive ion beams (RIBs) using the isotope separator on-line (ISOL) technique. An integrated strategic plan for physics, experimental systems, and RIB production facilities has been developed and implementation of the plan is under way. Research objectives are defined for advancing our understanding of the nature of nucleonic matter, the origin of elements, solar physics, and synthesis of heavy elements. Experimental systems upgrade plans include new detector arrays and beam lines, and expansion and upgrade of existing devices. A multifaceted facility expansion plan includes a $4.75M High Power Target Laboratory (HPTL), presently under construction, to provide a facility for testing new target materials, target geometries, ion sources, and beam preparation techniques. Additional planned upgrades include a second RIB production system (IRIS2), an external axial injection system for the present driver cyclotron, ORIC, and an additional driver accelerator for producing high-intensity neutron-rich beams. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RP Tatum, BA (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2424 EP 2426 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202081 ER PT B AU Weng, WT Lee, YY Raparia, D Tsoupas, N Wang, JB Wei, J Zhang, SY AF Weng, WT Lee, YY Raparia, D Tsoupas, N Wang, JB Wei, J Zhang, SY GP IEEE TI Beam loss estimates and control for the BNL neutrino facility SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The requirement for low beam loss is very important both to protect the beam component, and to make the hands-on maintenance possible. In this report, the design considerations to achieving high intensity and low loss will be presented. We start by specifying the beam loss limit at every physical process followed by the proper design and parameters for realizing the required goals. The process considered in this paper include the emittance growth in the linac, the H(-) injection, the transition crossing, the coherent instabilities and the extraction losses. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Weng, WT (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM weng@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2427 EP 2429 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202082 ER PT B AU Zhang, W Bellavia, S Sandberg, J Simos, N Tuozzolo, J Weng, WT Hseuh, B AF Zhang, W Bellavia, S Sandberg, J Simos, N Tuozzolo, J Weng, WT Hseuh, B GP IEEE TI Electromigration issues in high current horn SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The secondary particle focusing horn for the AGS neutrino experiment proposal is a high current and high current density device. The peak current of horn is 300 kA. At the smallest area of horn, the current density is near 8 kA/mm(2). At very high current density, a few kA/mm(2). the electromigration phenomena will occur. Momentum transfer between electrons and metal atoms at high current density causes electromigration. The reliability and lifetime of focusing horn can be severely reduced by electromigration. In this paper, we discuss issues such as device reliability model. incubation time of electromigration, and lifetime of horn. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Zhang, W (reprint author), Brookhaven Natl Lab, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2430 EP 2432 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202083 ER PT B AU Kirk, HG Kahn, SA Ludewig, H Palmer, RB Samulyak, R Simos, N Tsang, T Efthymiopoulos, I Fabich, A Haseroth, H Haug, F Lettry, J Gabriel, TA Graves, V Haines, J Spampinato, P McDonald, KT Bennett, JRJ Bradshaw, T Edgecock, TR Drumm, P Ivanyushenkov, Y Hayato, Y Yoshimura, K AF Kirk, HG Kahn, SA Ludewig, H Palmer, RB Samulyak, R Simos, N Tsang, T Efthymiopoulos, I Fabich, A Haseroth, H Haug, F Lettry, J Gabriel, TA Graves, V Haines, J Spampinato, P McDonald, KT Bennett, JRJ Bradshaw, T Edgecock, TR Drumm, P Ivanyushenkov, Y Hayato, Y Yoshimura, K GP IEEE TI A high-power target experiment SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We describe an experiment designed as a proof-of-principle test for a target system capable of converting a 4-MW proton beam into a high-intensity muon beam suitable for incorporation into either a neutrino factory complex or a muon collider. The target system is based on exposing a free mercury jet to an intense proton beam in the presence of a high-strength solenoidal magnetic field. C1 BNL, Upton, NY 11973 USA. RP Kirk, HG (reprint author), BNL, Upton, NY 11973 USA. EM hkirk@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2433 EP 2435 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202084 ER PT B AU Kurennoy, S Neri, F Barlow, D Blind, B Jason, A AF Kurennoy, S Neri, F Barlow, D Blind, B Jason, A GP IEEE TI Pion-muon concentrating system for detectors of highly enriched uranium SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB One of many possible applications of low-energy antiprotons collected in a Penning trap can be a portable muon source. Released antiprotons annihilate on impact with normal matter producing on average about three charged pions per antiproton, which in turn decay into muons. Existence of such negative-muon sources of sufficient intensity would be useful for detection and enrichment determination of highly enriched uranium based on muonic X-rays. We explore options of collecting and focusing pions and resulting unions to enhance the muon flux toward an object of interest. Simulations with MARS and MAFIA are used to choose the target material and parameters of the magnetic system of a few solenoids. C1 LANL, Los Alamos, NM 87545 USA. RP Kurennoy, S (reprint author), LANL, Los Alamos, NM 87545 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2436 EP 2438 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202085 ER PT B AU Hechler, M Cutler, R Error, J McGahern, B AF Hechler, M Cutler, R Error, J McGahern, B GP IEEE TI The installation status of the SNS accumulator ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source (SNS*) accumulator Ring, when completed in 2006, will be capable of delivering a 1.0 GeV, 1.4 MW proton beam to a liquid mercury target for neutron production. This paper presents an overview of the issues and logistics associated with the preparation and installation of the accelerator Ring System. The preparatory activities which occurred at BNL, vendors and at the SNS will be discussed as well as the installation sequence and status. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Hechler, M (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2439 EP 2441 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202086 ER PT B AU Kersevan, R Briggs, DP Campisi, IE Crandall, JA Douglas, DL Hunter, T Ladd, P Luck, C Morton, RC Russell, KS Stout, D AF Kersevan, R Briggs, DP Campisi, IE Crandall, JA Douglas, DL Hunter, T Ladd, P Luck, C Morton, RC Russell, KS Stout, D GP IEEE TI Status report on the installation of the warm sections for the superconducting linac at the SNS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The SNS superconducting linac (SCL) consists of 23 cryomodules (CMs), with possibly 9 additional CMs being added for future energy upgrade from 1 GeV to 1.3 GeV[l, 2]. A total of 32 warm sections separate the comparatively short CMs, and this allows a CM exchange within 48 hours, in order to meet demanding beam availability specifications. The 32 warm section chambers are installed between each pair of CMs, with each section containing a quadrupole doublet, beam diagnostics, and pumping [3]. The chambers are approximately 1.6 in long, have one bellows installed at each end for alignment, and are pumped by one ion-pump. The preparation and installation of these chambers must be made under stringent clean and particulate-free conditions, in order to ensure that the performance of the SCL CMs is not compromised. This paper discusses the development of the cleaning, preparation, and installation procedures that have been adopted for the warm sections, and the vacuum performance of the system. C1 ORNL, SNS, Oak Ridge, TN 37831 USA. RP Kersevan, R (reprint author), ORNL, SNS, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2442 EP 2444 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202087 ER PT B AU Stout, DS Campisi, IE Casagrande, F Cutler, R Hatfield, D Howell, M Hunter, T Kersevan, R Ladd, P Strong, H AF Stout, DS Campisi, IE Casagrande, F Cutler, R Hatfield, D Howell, M Hunter, T Kersevan, R Ladd, P Strong, H GP IEEE TI Installation of the spallation neutron source (SNS) superconducting linac SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source (SNS) superconducting linac (SCL) consists of 11 medium beta (0.61) and 12 high beta (0.81) superconducting RF cryomodules, 32 intersegment quadrupole magnet/diagnostics stations, 9 spool beampipes for future upgrade cryomodules, and two differential pumping stations on either end of the SCL. The cryomodules and spool beampipes were designed and manufactured by Jefferson Laboratory, and the quadrupole magnets and beam position monitors were designed and furnished by Los Alamos National Laboratory. Remaining items were designed by Oak Ridge National Laboratory. At present the SCL is being installed and tested. This paper discusses the experience gained during installation and the performance in terms of mechanical and cryogenic systems. C1 Oak Ridge Natl Lab, SNS Project, Oak Ridge, TN 37831 USA. RP Stout, DS (reprint author), Oak Ridge Natl Lab, SNS Project, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2445 EP 2447 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202088 ER PT B AU Caspi, S Ferracin, P AF Caspi, S Ferracin, P GP IEEE TI Limits of Nb(3)Sn accelerator magnets SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID RESEARCH-AND-DEVELOPMENT; DIPOLE MAGNET AB Pushing accelerator magnets beyond 10 T holds a promise of future upgrades to machines like the Tevatron at Fermilab and the LHC at CERN. Exceeding the current density limits of NbTi superconductor, Nb(3)Sn is at present the only practical superconductor capable of generating fields beyond 10 T. Several Nb3Sn pilot magnets, with fields as high as 16 T, have been built and tested, paving the way for future attempts at fields approaching 20 T. High current density conductor is required to generate high fields with reduced conductor volume. However this significantly increases the Lorentz force and stress. Future designs of coils and structures will require managing stresses of several 100's of MPa and forces of 10's of MN/m. The combined engineering requirements on size and cost of accelerator magnets will involve magnet technology that diverges from the one currently used with NbTi conductor. In this paper we shall address how far the engineering of high field magnets can be pushed, and what are the issues and limitations before such magnets can be used in particle accelerators. C1 LBNL, Berkeley, CA 94720 USA. RP Caspi, S (reprint author), LBNL, Berkeley, CA 94720 USA. EM S_CASPI@lbl.gov NR 18 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2457 EP 2461 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202092 ER PT B AU Kashikhin, VV Ambrosio, G Andreev, N Barzi, E Bossert, R DiMarco, J Kashikhin, VS Lamm, M Novitski, I Schlabach, P Velev, G Yamada, R Zlobin, AV AF Kashikhin, VV Ambrosio, G Andreev, N Barzi, E Bossert, R DiMarco, J Kashikhin, VS Lamm, M Novitski, I Schlabach, P Velev, G Yamada, R Zlobin, AV GP IEEE TI Field quality study in Nb(3)Sn accelerator magnets SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Four nearly identical Nb(3)Sn dipole models of the same design were built and tested at Fermilab. It provided a unique opportunity of systematic study the field quality effects in Nb(3)Sn accelerator magnets. The results of these studies are reported in the paper. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Kashikhin, VV (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM vadim@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2472 EP 2474 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202095 ER PT B AU Hunter, T Heimsoth, S LeBon, D McBrien, R Wang, JG AF Hunter, T Heimsoth, S LeBon, D McBrien, R Wang, JG GP IEEE TI Progress and status in SNS magnet measurements at ORNL SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source (SNS) contains more than 600 magnets. Among them, about 400 magnets for the Linac and transfer lines are being measured on site at Oak Ridge National Laboratory. These magnets include Permanent Magnet Quadrupoles, Electromagnetic Quadrupoles, Dipoles and Correctors. The Permanent Magnet Quadrupoles are installed in the Drift Tube Linac (DTL) and are the only Permanent Magnets in the machine. These measurements are for magnets installed in the DTL, Coupled Cavity Linac (CCL), Superconducting Linac (SCL), High Energy Beam Transport (HEBT), and the Ring to Target Beam Transport (RTBT) line. All magnets have met specifications. Approximately three fourths of the magnets have so far been measured and installed. This presentation outlines the magnet measurements for SNS at ORNL and overviews the activities and accomplishments to date. C1 SNS, ORNL, Oak Ridge, TN 37831 USA. RP Hunter, T (reprint author), SNS, ORNL, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2485 EP 2487 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202098 ER PT B AU Parker, B Escallier, J AF Parker, B Escallier, J GP IEEE TI Serpentine coil topology for BNL direct wind superconducting magnets SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Serpentine winding, a recent innovation developed at BNL for direct winding superconducting magnets, allows winding a coil layer of arbitrary multipolarity in one continuous winding process and greatly simplifies magnet design and production compared to the planar patterns used before. Serpentine windings were used for the BEPC-II Upgrade and JPARC magnets and are proposed to make compact final focus magnets for the ILC. Serpentine patterns exhibit a direct connection between 2D body harmonics and harmonics derived from the integral fields. Straightforward 2D optimization yields good integral field quality with uniformly spaced (natural) coil ends. This and other surprising features of Serpentine windings are addressed in this paper. C1 BNL, Upton, NY 11973 USA. RP Parker, B (reprint author), BNL, Upton, NY 11973 USA. EM parker@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2491 EP 2493 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202100 ER PT B AU Hettel, R AF Hettel, R CA SLAC GP IEEE TI SPEAR 3 - The first year of operation SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The first electrons were accumulated in the newly completed 3-GeV SPEAR 3 storage ring on December IS, 2003, five days after the beginning of commissioning. By mid-January of 2004, 100 mA were stored, the maximum current allowed in the first phase of SPEAR 3 operation, and ring characterization and tuning continued until early March when the first photon beam line was opened for users. After the first year of operation the SPEAR 3 beam properties and ring performance had been extensively measured. These include micron stability using slow orbit feedback, an emittance coupling of similar to 0.1% and 50-h lifetimes. The performance of SPEAR 3 during its first year of commissioning and operation and the improvement plans are described. C1 SSRL ASD, SLAC, Menlo Pk, CA 94025 USA. RP Hettel, R (reprint author), SSRL ASD, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2504 EP 2508 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202104 ER PT B AU Harkay, K Borland, M Chae, YC Decker, G Dejus, R Emery, L Guo, W Horan, D Kim, KJ Kustom, R Mills, D Milton, S Nassiri, A Pile, G Sajaev, V Shastri, S Waldschmidt, G White, M Yang, B Zholents, A AF Harkay, K Borland, M Chae, YC Decker, G Dejus, R Emery, L Guo, W Horan, D Kim, KJ Kustom, R Mills, D Milton, S Nassiri, A Pile, G Sajaev, V Shastri, S Waldschmidt, G White, M Yang, B Zholents, A GP IEEE TI Generation of short x-ray pulses using crab cavities at the advanced photon source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID SYNCHROTRON-RADIATION AB There is growing interest within the user community to utilize the pulsed nature of synchrotron radiation from storage ring sources. Conventional third-generation light sources can provide pulses on the order of 100 ps but typically cannot provide pulses of about 1 ps that some users now require to advance their research programs. However, it was recently proposed by A. Zholents et al. to use rf orbit deflection to generate sub-ps x-ray pulses [1]. In this scheme, two crab cavities are used to deliver a longitudinally dependent vertical kick to the beam, thus exciting longitudinally correlated vertical motion of the electrons. This makes it possible to spatially separate the radiation coming from different longitudinal parts of the beam. An optical slit can then be used to slice out a short part of the radiation pulse, or an asymmetrically cut crystal can be used to compress the radiation in time. In this paper we present a feasibility study of this method applied to the Advanced Photon Source (APS). We find that the pulse length can be decreased down to a 1 ps range using superconducting crab cavities. C1 ANL, Argonne, IL 60439 USA. RP Harkay, K (reprint author), ANL, Argonne, IL 60439 USA. EM harkay@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2514 EP 2516 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202106 ER PT B AU Chouhan, S Harder, D Rakowsky, G Skaritka, J Tanabe, T AF Chouhan, S Harder, D Rakowsky, G Skaritka, J Tanabe, T GP IEEE TI Research & development of a variable polarisation superconducting undulator at the NSLS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In this paper a new concept for a planar, superconductive, variable polarization undulator (VPU) is presented. Advantage of this design include: (1) electrical tunability for both right and left circular and elliptical, as well as linear vertical or horizontal, (2) it requires no compensation of unwanted vertical field component and (3) used only simple windings of superconductive wire in an interlaced pattern. The construction of the device is described and compared with a permanent magnet VPU with the same gap and period, as well as with previously published concepts. C1 Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. RP Chouhan, S (reprint author), Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. EM chouhan@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2517 EP 2519 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202107 ER PT B AU Teytelman, D AF Teytelman, D GP IEEE TI Beam-loading compensation for super B-factories SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID FEEDBACK AB Super B-factory designs under consideration expect to reach luminosities in the 10(35) - 10(36) range. The dramatic luminosity increase relative to the existing B-factories is achieved, in part, by raising the beam currents stored in the electron and positron rings. For such machines to succeed it is necessary to consider in the RF system design not only the gap voltage and beam power, but also the beam loading, effects. The main effects are the synchronous phase transients due to the uneven ring filling patterns and the longitudinal coupled-bunch instabilities driven by the fundamental impedance of the RF cavities. A systematic approach to predicting such effects and for optimizing the RF system design will be presented. Existing as well as promising new techniques for reducing the effects of heavy beam loading will be described and illustrated with examples from the PEP-II and the KEKB. C1 SLAC, Menlo Pk, CA 94025 USA. RP Teytelman, D (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM dim@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2525 EP 2529 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202109 ER PT B AU Blaskiewicz, M AF Blaskiewicz, M GP IEEE TI Stochastic cooling for bunched beams SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Problems associated with bunched beam stochastic cooling are reviewed. A longitudinal stochastic cooling system for RHIC is under construction and has been partially commissioned. The state of the system and future plans we discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Blaskiewicz, M (reprint author), Brookhaven Natl Lab, 911B, Upton, NY 11973 USA. EM blaskiewicz@bnl.gov NR 25 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2530 EP 2534 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202110 ER PT B AU Tennant, C Douglas, D Jordan, K Merminga, L Pozdeyev, E Wang, H AF Tennant, C Douglas, D Jordan, K Merminga, L Pozdeyev, E Wang, H GP IEEE TI Experimental investigation of beam breakup in the Jefferson Laboratory 10 kW FEL upgrade driver SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In recirculating accelerators, and in particular energy recovery linacs (ERLs), the maximum current can been limited by multipass, multibunch beam breakup (BBU), which occurs when the electron beam interacts with the higher-order modes (HOMs) of an accelerating cavity on the accelerating pass and again on the energy recovered pass. This effect is of particular concern in the design of modem high average current energy recovery accelerators utilizing superconducting RF technology. Experimental observations of the instability at the Jefferson Laboratory 10 kW Free-Electron Laser (FEL) are presented. Measurements of the threshold current for the instability are presented and compared to the predictions of several BBU simulation codes. With BBU posing a threat to high current beam operation in the FEL Driver, several suppression schemes were developed. These include direct damping of the dangerous HOMs and appropriately modifying the electron beam optics. Preliminary results of their effectiveness in raising the threshold current for stability are presented. 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. EM tennant@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2535 EP 2537 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202111 ER PT B AU Tan, CY AF Tan, CY GP IEEE TI Novel tune diagnostics for the Tevatron SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In the Tevatron collider, protons and antiprotons share the same beam pipe. This poses a challenge in the measurement of tunes for both species simultanously because of the possibility of signal contamination from the other species. The tune of each bunch is also very different because of beam-beam effects from parasitic crossing points. This means that the tune diagnostics must be able to differentiate between protons and anti-protons, it also has to measure tunes from each bunch. There are three different tune pickups used in the Tevatron: 1.7 GHz Schottky pick-ups, 21.4 MHz Schottky pickups and baseband pickups. These devices will be discussed in detail in this paper. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Tan, CY (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM cytan@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2546 EP 2550 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202114 ER PT B AU Antipov, SP Liu, WM Power, JG Spentzouris, LK AF Antipov, SP Liu, WM Power, JG Spentzouris, LK GP IEEE TI Left-handed metamaterials studies and their application to accelerator physics SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Recently, there has been a growing interest in applying artificial materials, known as Left-Handed Metamaterials (LHM), to accelerator physics. These materials have both negative permittivity and permeability and therefore possess several ununsual properties: the index of refraction is negative and the direction of the group velocity is antiparallel to the direction of the phase velocity (along k). These properties lead to a reverse Cherenkov effect [1,7], which has potential beam diagnostic applications, in addition to accelerator applications. Several LHM devices with different configurations are being experimentally and theoretically studied at Argonne. We are investigating the possibility of building a Cherenkov detector based on LHM and propose an experiment to observe the reverse radiation generated by an electron beam passing through a LHM. The potential advantage of a LHM detector is that the radiation in this case is emitted in the direction reversed to the direction of the beam, so it could be easier to get a clean measurement. C1 ANL, Argonne, IL 60439 USA. RP Antipov, SP (reprint author), ANL, Argonne, IL 60439 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2565 EP 2567 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202119 ER PT B AU Smirnova, EI Earley, LM Edwards, RL Kesar, AS Mastovsky, I Shapiro, MA Temkin, RJ AF Smirnova, EI Earley, LM Edwards, RL Kesar, AS Mastovsky, I Shapiro, MA Temkin, RJ GP IEEE TI Photonic band gap accelerator demonstration at Ku-band SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We report the successful cold test and hot test demonstrations of a metal Ku-band PBG accelerator structure. The 17.140 GHz 6-cell PBG accelerator structure with reduced long-range wakefields was designed for the experiment. The copper structure was electroformed and cold-tested. Tuning was performed through chemical etching of the rods. Final cold test measurements were found to be in very good agreement with the design. The structure was installed on the beam line at the accelerator laboratory at Massachusetts Institute of Technology and powered with 2 MW of peak power from the 17.14 GHz klystron. The electron beam was accelerated by 1.4 MeV inside the PBG accelerator, which is in excellent agreement with the predicted accelerating gradient of 35 MV/m. C1 Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Smirnova, EI (reprint author), Los Alamos Natl Lab, Los Alamos, NM 87544 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2579 EP 2581 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202123 ER PT B AU Cowan, B AF Cowan, B GP IEEE TI Photonic crystal laser-driven accelerator structures SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID INFRARED WAVELENGTHS AB We discuss simulated photonic crystal structure designs for laser-driven particle acceleration, focusing on three-dimensional planar structures based on the so-called "woodpile" lattice. We demonstrate guiding of a speed-of-light accelerating mode by a defect in the photonic crystal lattice and discuss the properties of this mode. We also discuss particle beam dynamics in the structure, presenting a novel method for focusing the beam. In addition we describe some potential coupling methods for the structure. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Cowan, B (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM benc@slac.stanford.edu NR 10 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2582 EP 2584 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202124 ER PT B AU Zholents, A AF Zholents, A GP IEEE TI Methods of attosecond x-ray pulse generation SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID FREE-ELECTRON LASER; FEL SIMULATION CODE; PARAMETRIC-AMPLIFIER; PHASE; FIELDS; LIGHT AB We review several proposals for generation of solitary attosecond pulses using two types of free electron lasers which are envisioned as future light sources for studies of ultra-fast dynamics using soft and hard x-rays. C1 LBNL, Berkeley, CA 94720 USA. RP Zholents, A (reprint author), LBNL, Berkeley, CA 94720 USA. NR 28 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2588 EP 2592 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202126 ER PT B AU Yang, BX Lumpkin, AH AF Yang, BX Lumpkin, AH GP IEEE TI Visualizing electron beam dynamics and instabilities with synchrotron radiation at the APS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Advanced Photon Source (APS) is a third-generation hard x-ray source serving a large scientific user community. In order to characterize the high-brilliance beams, the APS diagnostics beamlines have been developed into a full photon diagnostics suite. We will describe the design and capabilities of the APS visible-light imaging line, the bend magnet x-ray pinhole camera, and a unique diagnostics undulator beamline. Their primary functions are to support APS user operations by providing information on beam sizes (20 - 100 micrometers), divergence (3 - 25 microradians), and bunch length (20 - 50 ps). Through the use of examples, we will show how these complementary imaging tools are used to visualize the electron dynamics and investigate beam instabilities. Special emphasis will be put on the use of undulator radiation, which is uniquely suitable for time-resolved imaging of electron beam with high spatial resolution and for measurements of longitudinal beam properties, such as beam energy spread and momentum compaction. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Yang, BX (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM bxyang@aps.anl.gov NR 13 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2603 EP 2607 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202129 ER PT B AU Connolly, R Michnoff, R Tepikian, S AF Connolly, R Michnoff, R Tepikian, S GP IEEE TI Residual-gas-ionization beam profile monitors in RHIC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Four ionization profile monitors (IPMs) in RHIC measure vertical and horizontal beam profiles in the two rings by measuring the distribution of electrons produced by beam ionization of residual gas. During the last three years both the collection accuracy and signal/noise ratio have been improved. An electron source is mounted across the beam pipe from the collector to monitor microchannel plate (MCP) aging and the signal electrons are gated to reduce MCP aging and to allow charge replenishment between single-turn measurements. Software upgrades pen-nit simultaneous measurements of any number of individual bunches in the ring. This has been used to measure emittance growth rates on six bunches of varying intensifies in a single store. Also the software supports FFT analysis of turn-by-turn profiles of a single bunch at injection to detect dipole and quadrupole oscillations. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Connolly, R (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2608 EP 2612 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202130 ER PT B AU Scarvie, T Sannibale, F Biocca, A Kelez, N Martin, MC Nishimura, T Portmann, G Williams, E AF Scarvie, T Sannibale, F Biocca, A Kelez, N Martin, MC Nishimura, T Portmann, G Williams, E GP IEEE TI Beam measurements and upgrade at BL 7.2, the second diagnostics beamline of the advanced light source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Beamline 7.2 of the Advanced Light Source (ALS) at the Lawrence Berkeley National Laboratory (LBNL) is a beam diagnostics system that uses the synchrotron radiation emitted by a dipole magnet. It consists of two branches; in the first one the x-ray portion of the radiation is used in a pinhole camera system for measuring the transverse profile of the beam. The second branch is equipped with an x-ray beam position monitor (BPM) and with a multipurpose port where the visible and the far-infrared part of the radiation can be used for various applications such as bunch length measurements and IR coherent synchrotron radiation experiments. The pinhole system has been operating successfully since the end of 2003. The installation of the second branch has been completed recently and the results of its commissioning are presented in this paper together with examples of beam measurements performed at BL 7.2. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Scarvie, T (reprint author), Lawrence Berkeley Natl 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2613 EP 2615 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202131 ER PT B AU Wolbers, S Banerjee, B Barker, B Bledsoe, S Boes, T Bowden, M Cancelo, G Forster, B Duerling, G Haynes, B Hendricks, B Kasza, T Kutschke, R Mahlum, R Martens, M Mengel, M Olson, M Pavlicek, V Pharn, T Piccoli, L Steimel, J Treptow, K Votava, M West, B Webber, R Zhang, D AF Wolbers, S Banerjee, B Barker, B Bledsoe, S Boes, T Bowden, M Cancelo, G Forster, B Duerling, G Haynes, B Hendricks, B Kasza, T Kutschke, R Mahlum, R Martens, M Mengel, M Olson, M Pavlicek, V Pharn, T Piccoli, L Steimel, J Treptow, K Votava, M West, B Webber, R Zhang, D GP IEEE TI Tevatron beam position monitor upgrade SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Tevatron Beam Position Monitor (BPM) readout electronics and software have been upgraded to improve measurement precision, functionality and reliability. The original system, designed and built in the early 1980's, became inadequate for current and future operations of the Tevatron. The upgraded system consists of 960 channels of new electronics to process analog signals from 240 BPMs, new front-end software, new online and controls software, and modified applications to take advantage of the improved measurements and support the new functionality. The new system reads signals from both ends of the existing directional stripline pickups to provide simultaneous proton and antiproton position measurements. Measurements using the new system are presented that demonstrate its improved resolution and overall performance. C1 Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Wolbers, S (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2616 EP 2618 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202132 ER PT B AU Adolphsen, C AF Adolphsen, C GP IEEE TI Advances in normal conducting accelerator technology from the X-band linear collider program SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In the mid-1990's, groups at SLAC and KEK began dedicated development of X-band (11.4 GHz) rf technology for a next generation, TeV-scale linear collider. The choice of a relatively high frequency, four times that of the SLAC 50 GeV Linac, was motivated by the cost benefits of having lower rf energy per pulse (hence fewer rf sources) and reasonable efficiencies at high gradients (hence shorter linacs). To realize such savings, however, requires operation at gradients and peak powers much higher than that hitherto achieved. During the past twelve years, these challenges were met through innovations on several fronts. This paper reviews these achievements, which include developments in the generation and transport of high power rf, and new insights into high gradient limitations. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Adolphsen, C (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2643 EP 2647 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202139 ER PT B AU Conde, ME Antipov, S Gai, W Jing, C Konecny, R Liu, W Power, JG Wang, H Yusof, Z AF Conde, ME Antipov, S Gai, W Jing, C Konecny, R Liu, W Power, JG Wang, H Yusof, Z GP IEEE TI The Argonne Wakefield Accelerator Facility: Status and recent activities SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We describe the Argonne Wakefield Accelerator Facility (AWA), pointing out its present capabilities and goals. We present recent measurements on beam loading observed in our photocathode RF gun. Wakefield measurements in dielectric loaded structures are also reported. Our most recent wakefield structure operates at 15 GHz, and has been excited by single electron bunches and also by sets of two closely spaced bunches. When driven by 43 nC bunches, the accelerating gradient in this structure reached 23 MV/m. No signs of electric breakdown have been observed. This report ends with a brief discussion on the next activities to take place at the AWA facility. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Conde, ME (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM conde@anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2688 EP 2690 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202152 ER PT B AU Jing, C Power, JG Konecny, R Gai, W Gold, SH Kinkead, AK AF Jing, C Power, JG Konecny, R Gai, W Gold, SH Kinkead, AK GP IEEE TI Progress on high power tests of dielectric-loaded accelerating structures SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB To evaluate the Dielectric-Loaded Accelerating (DLA) structure as a potential alternative high-gradient accelerator, a series of high power RF experiments have been carried-out by a joint Argonne National Laboratory/Naval Research Laboratory program. We have tested DLA structures loaded with two different ceramic materials, alumina and Mg(x)Ca(1-x)TiO(3). For the alumina tube, we concentrated on the study of the multipactor effect in the DLA structures under the high power rf field. In the Mg(x)Ca(1-x)TiO(3) tests, we mainly investigate the local field enhancement that caused dielectric joint breakdown of the DLA structures. In both cases, physical models have been set up, and the corresponding engineering solutions are being implemented. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Jing, C (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM jingchg@hep.anl.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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2691 EP 2693 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202153 ER PT B AU Jing, C Liu, W Gai, W Power, JG Kanareykin, A AF Jing, C Liu, W Gai, W Power, JG Kanareykin, A GP IEEE TI 34.272 GHz multilayered dielectric-loaded accelerating structure SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A multilayered 34.272 GHz dielectric accelerating structure is described that is based on the Bragg fiber concept. Alternating radial dielectric layers of permittivities 38 and 9.7 create multiple reflections to confine the accelerating fields, thus greatly reducing the power losses from the external metal wall. The structure will operate at TM(03) mode instead of the usual TM(01). Numerical examples for 2- and 4-layer structures are presented with detailed analysis of TM (acceleration) modes. We found that the power attenuation of a 34.272 GHz dielectric loaded structure can be reduced from similar to 20 dB/m for a conventional single layer structure to less than 6 dB/m for a 2 or 4 layer structure. We also present a coupler design for the multilayered dielectric-loaded accelerating structure, which has the capability of mode selection and high efficiency RF transmission. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Jing, C (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM jingchg@hep.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2694 EP 2696 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202154 ER PT B AU Barnes, CD Decker, RJ Emma, P Hogan, MJ Iverson, R Krejcik, P O'Connell, CL Siemann, R Walz, D Clayton, CE Huang, C Johnson, DK Joshi, C Lu, W Marsh, KA Deng, S Katsouleas, T Muggli, R Oz, E AF Barnes, CD Decker, RJ Emma, P Hogan, MJ Iverson, R Krejcik, P O'Connell, CL Siemann, R Walz, D Clayton, CE Huang, C Johnson, DK Joshi, C Lu, W Marsh, KA Deng, S Katsouleas, T Muggli, R Oz, E GP IEEE TI Determination of longitudinal phase space in SLAC main accelerator beams SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In the E164 Experiment at the Stanford Linear Accelerator Center (SLAC), we drive plasma wakes for electron acceleration using 28.5 GeV bunches from the main accelerator. These bunches can now be made with an RMS length of 12 microns, and accurate direct measurement of their lengths is not feasible shot by shot. Instead, we use an indirect technique, measuring the energy spectrum at the end of the Linac and comparing with detailed simulations of the entire machine. We simulate with LiTrack, a 2D particle tracking code developed at SLAC. Understanding the longitudinal profile allows a better understanding of acceleration in the plasma wake, as well as investigation of related effects. We discuss the method and validation of our phase space determinations. C1 SLAC, Menlo Pk, CA 94025 USA. RP Barnes, CD (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM cbarnes@slac.stanford.edu RI Lu, Wei/F-2504-2016 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2703 EP 2705 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202157 ER PT B AU O'Connell, CL Barnes, CD Decker, FJ Hogan, MJ Iverson, R Krejcik, P Siemann, R Walz, DR Deng, S Katsouleas, T Muggli, P Oz, E Clayton, CE Huang, C Johnson, DK Joshi, C Lu, W Marsh, KA Mori, W Zhou, M AF O'Connell, CL Barnes, CD Decker, FJ Hogan, MJ Iverson, R Krejcik, P Siemann, R Walz, DR Deng, S Katsouleas, T Muggli, P Oz, E Clayton, CE Huang, C Johnson, DK Joshi, C Lu, W Marsh, KA Mori, W Zhou, M GP IEEE TI Field ionization of neutral lithium vapor using a 28.5 GeV electron beam SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The E164/E164X plasma wakefield experiment studies beam-plasma interactions at the Stanford Linear Acceleration Center (SLAC). Due to SLAC's recent ability to variably compress bunches longitudinally from 650 Am down to 20 Am, the incoming beam is sufficiently dense to field ionize the neutral lithium (Li) vapor. The field ionization effects are characterized by the beams energy loss through the Li vapor column. Experiment results are presented. C1 SLAC, Menlo Pk, CA 94025 USA. RP O'Connell, CL (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM coconnel@slac.stanford.edu RI Lu, Wei/F-2504-2016 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2706 EP 2708 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202158 ER PT B AU Siemann, RH Chao, AW AF Siemann, RH Chao, AW GP IEEE TI Wakefields in a dielectric tube with frequency dependent dielectric constant SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Laser driven dielectric accelerators could operate at a fundamental mode frequency where consideration must be given to the frequency dependence of the dielectric constant when calculating wakefields. Wakefields are calculated for a frequency dependence that arises from a single atomic resonance. Causality is considered, and the effects on the short range wakefields are calculated. C1 SLAC, Stanford, CA 94309 USA. RP Siemann, RH (reprint author), SLAC, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2709 EP 2711 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202159 ER PT B AU Hussein, YA Spencer, JE AF Hussein, YA Spencer, JE GP IEEE TI Calculations for tera-hertz (THz) radiation sources SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID TERAHERTZ TECHNOLOGY AB We explore possibilities for THz sources from 0.3 - 30 THz. While still inaccessible, this broad gap is even wider for advanced acceleration schemes extending from X or, at most, W band RF at the low end up to CO? lasers. While physical implementations of these approaches are quite different, both are proving difficult to develop so yet lower frequency, superconducting RF is preferred. Similarly, the validity of modelling techniques varies greatly over this range but generally mandates coupling Maxwell's equations to die appropriate device transport physics for which there are many options. Here we study radiation from undulatory-shaped transmission lines using finite-difference, time-domain (FDTD) simulations. Also, we present Monte-Carlo techniques for pulse generation. Examples of THz sources demonstrating constructive interference are shown with the goal of optimizing on-chip radiators. C1 Stanford Univ, SLAC, Menlo Pk, CA 94025 USA. RP Hussein, YA (reprint author), Stanford Univ, SLAC, Menlo Pk, CA 94025 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2712 EP 2714 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202160 ER PT B AU Colby, E Noble, R Palmer, D Siemann, R Spencer, J AF Colby, E Noble, R Palmer, D Siemann, R Spencer, J GP IEEE TI Beam dynamics studies for a laser acceleration experiment SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The NLC Test Accelerator (NLCTA) at SLAC was built to address various beam dynamics issues for the Next Linear Collider. An S-Band RF gun is being installed together with a large-angle extraction line at 60 MeV followed by a matching section, buncher and final focus for the laser acceleration experiment, E163. The laser-electron interaction area is followed by a broad range, high resolution spectrometer (HES) for electron bunch analysis. Another spectrometer at 6 MeV will be used for analysis of bunch charges up to 1 nC. Emittance compensating solenoids and the low energy spectrometer (LES) will be used to tune for best operating point and match to the linac. Optical symmetries in the design of the 25.5 degrees extraction line provide 1:1 phase space transfer without use of sextupoles for a large, 6D phase space volume and range of input conditions. Design techiques, tolerances, tuning sensitivities and orthogonal knobs are discussed. C1 SLAC, Menlo Pk, CA 94025 USA. RP Colby, E (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM jus@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2715 EP 2717 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202161 ER PT B AU Sears, CMS Colby, E Cowan, B Siemann, RH Spencer, J Byer, RL Plettner, T AF Sears, CMS Colby, E Cowan, B Siemann, RH Spencer, J Byer, RL Plettner, T GP IEEE TI High-harmonic inverse Free-Electron-Laser interaction at 800 nm SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID GAIN AB The inverse Free Electron Laser (IFEL) interaction has recently been proposed and used as a short wavelength modulator for micro bunching of beams for laser acceleration experiments [1,2]. These experiments utilized the fundamental of the interaction between the laser field and electron bunch. In the current experiment, we explore the higher order resonances of the IFEL interaction from a 3 period, 1.8 centimeter wavelength undulator with a picosecond, 0.5 mJ/pulse laser at 800nm. The resonances are observed by adjusting the gap of the undulator while keeping the beam energy constant. We also compare the experimental results to a simple analytic model that describes coupling to high order harmonics of the interaction. C1 SLAC, Menlo Pk, CA 94025 USA. RP SLAC, Menlo Pk, CA 94025 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2718 EP 2720 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202162 ER PT B AU Zhang, Z Tantawi, S Ruth, R AF Zhang, Z Tantawi, S Ruth, R GP IEEE TI Distributed Bragg coupler for optical all-dielectric electron accelerator SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A Bragg waveguide consisting of multiple dielectric layers with alternating index of refraction provides confinement of a synchronous speed-of-light mode with extremely low loss. There are three requirements in designing input coupler for a Bragg electron accelerator: side-coupling, selective mode excitation, and high coupling efficiency. We present a side coupling scheme using a Bragg-grating-assisted input coupler to address these three requirements. Side coupling is achieved by a second order Bragg grating with a period on the order of an optical wavelength. The phase matching condition results in resonance coupling thus providing selective mode excitation capability. We demonstrate a non-uniform distributed grating structure generating an outgoing beam with a Gaussian profile, therefore, increasing the coupling efficiency. C1 SLAC, Menlo Pk, CA 94025 USA. RP Zhang, Z (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM zhiyuz@SLAC.Stanford.EDU NR 9 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2721 EP 2723 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202163 ER PT B AU Piot, P Tikhoplav, R AF Piot, P Tikhoplav, R GP IEEE TI Simulation of the laser acceleration experiment at the Fermilab/NICADD photoinjector laboratory SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The possibility of using laser beam to accelerate electrons in a waveguide structure with dimension much larger than the laser wavelength was proposed by Pantel and analytically investigated by Me. In the present paper we present the status of our experimental plan to demonstrate the laser/e(-) interaction using an e(-) beam with initial energy of 40-50 MeV. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Piot, P (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2736 EP 2738 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202168 ER PT B AU Hur, MS Suk, H Kim, GH Lindberg, R Charman, A Wurtele, J AF Hur, MS Suk, H Kim, GH Lindberg, R Charman, A Wurtele, J GP IEEE TI Ultraintense and ultrashort laser pulses from Raman amplification in plasma for laser-plasma accelerators SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We present analysis and simulations of electron trapping effect in the Raman pulse amplification in plasma. A ultraintense and ultrashort laser pulse is a very essential part in an advanced acceleration scheme using laser and plasma. Recently many prominent experimental observations and simulations were reported, where laser pulses of a few terawatt in power and less than 100 fs in the duration were used. To make such strong pulses, a novel scheme of using Raman backscatter in plasma was proposed and has been studied intensively. The Raman amplification in plasma does not have a restriction in material damage threshold. However, for the new amplifier to be a promising alternative of the CPA technique, more extensive studies on various issues are required. One of the fundamental issues is the electron kinetic effect such as particle trapping or wavebreaking. We describe averaged-particle-in-cell (aPIC) scheme to simulate the Raman amplification system and discuss the particle trapping effect using the aPIC model. C1 LBNL, Berkeley, CA 94720 USA. RP Hur, MS (reprint author), LBNL, Berkeley, CA 94720 USA. EM mshur@keri.re.kr RI wurtele, Jonathan/J-6278-2016 OI wurtele, Jonathan/0000-0001-8401-0297 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2772 EP 2774 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202180 ER PT B AU Oz, E Deng, S Katsouleas, T Muggli, P Barnes, CD Decker, FJ Hogan, MJ Iverson, R Johnson, DK Krejcik, P O'Connell, C Siemann, RH Walz, D Clayton, CE Huang, C Joshi, C Lu, W Marsh, KA Mori, WB Zhou, M AF Oz, E Deng, S Katsouleas, T Muggli, P Barnes, CD Decker, FJ Hogan, MJ Iverson, R Johnson, DK Krejcik, P O'Connell, C Siemann, RH Walz, D Clayton, CE Huang, C Joshi, C Lu, W Marsh, KA Mori, WB Zhou, M GP IEEE TI Plasma dark current in self-ionized plasma wake field accelerators SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Evidence of particle trapping has been observed in a beam driven Plasma Wake Field Accelerator (PWFA) experiment, E164X, conducted at the Stanford Linear Accelerator Center by a collaboration which includes USC, UCLA and SLAC. Such trapping produces plasma dark current when the wakefield amplitude is above a threshold value and may place a limit on the maximum acceleration gradient in a PWFA. Trapping and dark current are enhanced when in an ionizing plasma, that is self-ionized by the beam. Here we present experimental results. C1 SLAC, Stanford, CA 94025 USA. RP Oz, E (reprint author), SLAC, Stanford, CA 94025 USA. RI Lu, Wei/F-2504-2016 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2780 EP 2782 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202183 ER PT B AU Charman, AE Lindberg, RR Wurtele, JS Berkeley, UC Friedland, L AF Charman, AE Lindberg, RR Wurtele, JS Berkeley, UC Friedland, L GP IEEE TI Robust autoresonant excitation in the plasma beat-wave accelerator: A theoretical study SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A modified version of the Plasma Beat-Wave Accelerator scheme is presented, which is based on autoresonant phase-locking of the nonlinear Langmuir wave to the slowly chirped beat frequency of the driving lasers via adiabatic passage through resonance. Compared to traditional approaches, the autoresonant scheme achieves larger accelerating electric fields for given laser intensity; the plasma wave excitation is more robust to variations in plasma density; it is largely insensitive to the details of the slow chirp rate; and the quality and uniformity of the resulting plasma wave for accelerator applications may be superior. C1 Univ Calif Berkeley, LBNL, Berkeley, CA 94720 USA. RP Charman, AE (reprint author), Univ Calif Berkeley, LBNL, Berkeley, CA 94720 USA. EM acharman@berkeley.edu RI wurtele, Jonathan/J-6278-2016 OI wurtele, Jonathan/0000-0001-8401-0297 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2798 EP 2800 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202189 ER PT B AU Bhat, CM AF Bhat, CM GP IEEE TI A new technique for making bright proton bunches using barrier RF systems SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB I describe here a very promising scheme for producing bright proton bunches for proton-antiproton and proton-proton colliders. The method is based on the use of wide-band barrier rf systems. First, I explain the principle of the method. The beam dynamics simulations applied to the Fermilab Main Injector (MI) suggest that the scheme allows a wide range of bunch intensities and emittances for ppbar collider. This method has the potential to increase the instantaneous luminosity by >= 30% at the Tevatron. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Bhat, CM (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM cbhat@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2861 EP 2863 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202210 ER PT B AU Bhat, CM Capista, DP Chase, BE Dey, JE Kourbanis, I Seiya, K Wu, V AF Bhat, CM Capista, DP Chase, BE Dey, JE Kourbanis, I Seiya, K Wu, V GP IEEE TI Mixed PBAR source operation at the Fermilab Tevatron SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Recently we have adopted a scheme, called "Mixed pbar Source Operation" in the Fermilab Main Injector (MI). The purpose of this mode of operation is to transfer pbar bunches from the Recycler and the Accumulator to the Tevatron for collider shots. In this scheme, four 2.5 MHz pbar bunches are injected in to the MI, re-bunched in four groups of 53 MHz bunches at 8 GeV, accelerated to 150 GeV, and coalesced in to four 53 MHz bunches before transfer to the Tevatron. A special magnet ramp is needed in the MI to allow for pbar beam of slightly different 8 GeV energies from the Recycler and the Accumulator. Here we will present the status of this scheme. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Bhat, CM (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM cbhat@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2864 EP 2866 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202211 ER PT B AU Snopok, P Johnstone, C Berz, M AF Snopok, P Johnstone, C Berz, M GP IEEE TI Decoupling schemes for the Tevatron in the presence of skew quadrupole fields SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Increasing demands for luminosity in existing and future colliders have made both lattice design and error tolerance and correction critical to achieving performance goals. The current state of the Tevatron collider is an example, with a strong skew quadrupole error present in the operational lattice. This work studies the high order performance of the Tevatron and the strong nonlinear behavior introduced when a significant skew quadrupole error is combined with conventional sextupole correction, a behavior still clearly evident after optimal tuning of available skew quadrupole circuits. An optimization study is performed using different skew quadrupole families, and, importantly, local and global correction of the linear skew terms in maps generated by the code COSY. This correction scheme is coma pared with the present Tevatron operational lattice and corrector configuration. C1 Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Snopok, P (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2867 EP 2869 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202212 ER PT B AU Moore, RS Alexahin, Y Johnstone, J Sen, T AF Moore, RS Alexahin, Y Johnstone, J Sen, T GP IEEE TI Improving the Tevatron collision helix SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In the Tevatron, protons and antiprotons circulate in a single beam pipe, so electrostatic separators are used to create helical orbits that keep the two beams separated except at the two interaction points (IP). Increasing the separation outside of the IPs is desirable in order to decrease long range beam-beam effects during high energy physics (REP) stores. We can increase separation by running the separators at higher gradients or by installing additional separators. We are pursuing both strategies in parallel. Here, we describe Tevatron operation with higher separator gradients and with new separators installed during a recent shutdown. We also describe possible future installations. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Moore, RS (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2870 EP 2872 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202213 ER PT B AU Syphers, MJ Harding, DJ AF Syphers, MJ Harding, DJ GP IEEE TI Deterioration of the skew quadrupole moment in Tevatron dipoles over time SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB During the 20 years since it was first commissioned, the Fermilab Tevatron has developed strong coupling between the two transverse degrees of freedom. A circuit of skew quadrupole magnets is used to correct for coupling and, though capable, its required strength has increased since 1983 by more than an order of magnitude. In more recent years changes to the Tevatron for colliding beams operation have altered the skew quadrupole corrector distribution and strong local coupling become evident, often encumbering routine operation during the present physics run. Detailed magnet measurements were performed on each individual magnet during construction, and in early 2003 it was realized that measurements could be performed on the magnets in situ which could determine coil movements within the iron yoke since the early 1980's. It was discovered that the superconducting coils had become vertically displaced relative to their yokes since their construction. The ensuing systematic skew quadrupole field introduced by this displacement accounts for the required corrector settings and observed beam behavior. An historical account of the events leading to this discovery and progress toward its remedy are presented. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60150 USA. RP Syphers, MJ (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60150 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2873 EP 2875 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202214 ER PT B AU Syphers, MJ Annala, G Edwards, DA Gelfand, N Johnstone, J Martens, MA Sen, T AF Syphers, MJ Annala, G Edwards, DA Gelfand, N Johnstone, J Martens, MA Sen, T GP IEEE TI Observations of strong transverse coupling in the Tevatron SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB During the beginning of Run II of the Tevatron Collider it became apparent that a large skew quadrupole source, or sources, had developed in the superconducting synchrotron. Efforts to locate the current source of coupling were undertaken, with the eventual discovery that the main magnets had developed a systematic skew quadrupole moment over their lifetime. Over the past year, the magnets have been altered in place in an attempt to restore the systematic skew quadrupole moment to zero. Beam observations and their interpretations are presented, and remedial measures are discussed. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60150 USA. RP Syphers, MJ (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60150 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2876 EP 2878 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202215 ER PT B AU Velev, GV Ambrosio, G Annala, G Bauer, P Carcagno, R DiMarco, J Glass, H Hanft, R Kephart, R Lamm, M Martens, M Schlabach, P Sylvester, C Tartaglia, M Tompkins, J AF Velev, GV Ambrosio, G Annala, G Bauer, P Carcagno, R DiMarco, J Glass, H Hanft, R Kephart, R Lamm, M Martens, M Schlabach, P Sylvester, C Tartaglia, M Tompkins, J GP IEEE TI Measurements of field decay and snapback effect on Tevatron dipole and quadrupole magnets SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Since the beginning of 2002 an intensive measurement program has been performed at the Fermilab Magnet Test Facility (MTF) to understand dynamic effects in Tevatron magnets. Based on the results of this program a new correction algorithm was proposed to compensate for the decay of the sextupole field during the dwell at injection and for the subsequent field "snapback" during the first few seconds of the energy ramp. Beam studies showed that the new correction algorithm works better than the original one, and improves the Tevatron efficiency by at least 3%. The beam studies also indicated insufficient correction during the first 6s of the injection plateau Where an unexpected discrepancy of 0.15 sextupole units of extra drift was observed. This paper reports on the most recent measurements of the Tevatron dipoles field at the beginning of the injection plateau. Results on the field decay and snapback in the Tevatron quadrupoles are also presented. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Velev, GV (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM velev@fnal.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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2879 EP 2881 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202216 ER PT B AU Volk, JT Annala, J Elementi, L Gelfand, N Gollwitzer, KE Greenwood, J Martens, M Moore, C Nobrega, A Russell, AD Shiltsev, V Stefanski, R Sager, T Syphers, MJ Wojcik, G AF Volk, JT Annala, J Elementi, L Gelfand, N Gollwitzer, KE Greenwood, J Martens, M Moore, C Nobrega, A Russell, AD Shiltsev, V Stefanski, R Sager, T Syphers, MJ Wojcik, G GP IEEE TI Tevatron alignment issues 2003-2004 SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB It was observed during the early part of Run 11 that dipole corrector currents in the Tevatron were changing over time. Measurement of the roll for dipoles and quadrupoles confirmed that there was a slow and systematic movement of the magnets from their ideal position. A simple system using a digital protractor and laptop computer was developed to allow roll measurements of all dipoles and quadrupoles. These measurements showed that many magnets in the Tevatron had rolled more than 1 milli-radian. To aid in magnet alignment a new survey network was built in the Tevatron tunnel. This network is based on the use of free centering laser tracker. During the measurement of the network coordinates for all dipole, quadrupole and corrector magnets were obtained. This paper discusses roll measurement techniques and data, the old and new Tevatron alignment network. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Volk, JT (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM volk@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2882 EP 2884 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202217 ER PT B AU Wu, V Bhat, CM MacLachlan, JA AF Wu, V Bhat, CM MacLachlan, JA GP IEEE TI Simulations of an acceleration scheme for producing high intensity and low emittance antiproton beam for Fermilab collider operation SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB During Fermilab collider operation, the Main Injector (MI) provides high intensity and low emittance proton and antiproton beams for the Tevatron. The present coalescing scheme for antiprotons in the Main Injector yields about a factor of two increase in the longitudinal emittance and a factor of 5% to 20% decrease in intensity before injection to the Tevatron. In order to maximize the integrated luminosity delivered to the collider experiments, it is important to minimize the emittance growth and maximize the intensity of the MI beam. To this end, a new scheme using a combination of 2.5 MHz and 53 MHz accelerations has been developed and tested. This paper describes the full simulation of the new acceleration scheme, taking account of space charge, 2.5 MHz and 53 MHz beam loading, and the effect of residual 53 MHz rf voltage during 2.5 MHz acceleration and rf manipulations. The simulations show the longitudinal emittance growth at the 10% level with no beam loss. The experimental test of the new scheme is reported in another PAC05 paper. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Wu, V (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM vincentw@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2885 EP 2887 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202218 ER PT B AU Shiltsev, V Alexahin, Y Lebedev, V Lebrun, P Moore, RS Sen, T Valishev, A Zhang, XL AF Shiltsev, V Alexahin, Y Lebedev, V Lebrun, P Moore, RS Sen, T Valishev, A Zhang, XL GP IEEE TI Beam-beam effects in the Tevatron Run II SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Electromagnetic long-range and head-on interactions of high intensity proton and antiproton beams are significant sources of beam loss and lifetime limitations in the Tevatron Collider Run 11 (2001-present). We present observations of the beam-beam phenomena in the Tevatron and results of relevant beam studies. We analyze the data and various methods employed in high energy physics (HEP) operation, predict the performance for planned luminosity upgrades and discuss ways to improve it. C1 Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Shiltsev, V (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2888 EP 2890 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202219 ER PT B AU Zhang, XL Shiltsev, V Tan, CY AF Zhang, XL Shiltsev, V Tan, CY GP IEEE TI Tevatron admittance measurement SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We measured the Tevatron beam admittance by the means of exciting the beam with noise and causing emittance growth. The noise power was about 3W with a bandwidth of 100Hz and centered either in the horizontal betatron frequency or vertical betatron frequency. We were able to controllably blow the beam emittance up quickly. From the point where the beam emittance stopped growing, we measured the beam acceptance of the Tevatron. 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 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2891 EP 2893 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202220 ER PT B AU Drozhdin, AI Kostin, MA Mokhov, NV AF Drozhdin, AI Kostin, MA Mokhov, NV GP IEEE TI Energy deposition issues at 8 GeVH(-) beam collimation and injection to the Fermilab Main Injector SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The energy deposition and radiation issues at 8 GeV H beam collimation in the beam transfer line and at stripping injection to the Fermilab Main Injector (MI) are analyzed. Detailed calculations with the STRUCT [1] and MARS 15 [2] codes are performed on heating of collimators and stripping foils, as well as on accelerator elements radioactivation at normal operation. Extraction of the unstripped part of the beam to the external beam dump and loss of the excited-state H(0) atoms in MI are also studied. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Drozhdin, AI (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM drozhdin@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2894 EP 2896 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202221 ER PT B AU McCrory, E Shiltsev, V Slaughter, AJ Xiao, A AF McCrory, E Shiltsev, V Slaughter, AJ Xiao, A GP IEEE TI Fitting the luminosity decay in the Tevatron SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This paper explores how to fit the decay of the luminosity in the Tevatron. The standard assumptions of a fixed-lifetime exponential decay are only appropriate for very short time intervals. A "1/time" functional form fits well, and is supported by analytical derivations. A more complex form, assuming a time-varying lifetime-like term, also produces good results. Changes in the luminosity can be factored into two phenomena: The luminosity burn-off rate, and the burn-off rate from nonluminosity effects. This is particularly relevant for the antiprotons in the Tevatron. The luminous and the nonluminous bum rate of the antiprotons are shown for Tevatron stores. C1 Fermilab Natl Accelerator Lab, Batavia, IL USA. RP McCrory, E (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2897 EP 2899 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202222 ER PT B AU McCrory, E AF McCrory, E GP IEEE TI Monte Carlo of Tevatron operations, including the recycler SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A Monte Carlo model depicting the operation of the Fermilab Tevatron Complex has been constructed. The purpose is to replicate the general behavior of the Complex, incorporating aspects that are known to affect its performance, in order to learn how optimally to run the Complex. The newest ring at Fermilab, the Recycler, has been added to the model in order to understand how best to incorporate it into the rest of the Complex. This model includes numerous parameterizations of the Complex, including reasonable random fluctuations and normal interruptions in operation of each accelerator due to downtime. Optimizations are performed to guide us in making using the model in order to maximize the integrated luminosity delivered to the experiments. C1 Fermilab Natl Accelerator Lab, Batavia, IL USA. RP McCrory, E (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2900 EP 2902 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202223 ER PT B AU Shiltsev, V McCrory, E AF Shiltsev, V McCrory, E GP IEEE TI Characterizing luminosity evolution in the Tevatron SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We derive an approximate form of a luminosity evolution in a high intensity hadron collider taking into account the most important phenomena of intrabeam scattering (IBS), beam burn-up due to luminosity and beam-beam effects. It is well known that an exponential decay does not describe luminosity evolution verb; well unless the lifetime is allowed to vary with time. However, a "1/time" evolution, which this derivation shows is a good approximation, fits data from the Tevatron well. C1 Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Shiltsev, V (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2903 EP 2904 PG 2 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202224 ER PT B AU Sen, T Erdelyi, B AF Sen, T Erdelyi, B GP IEEE TI Feasibility study of beam-beam compensation in the Tevatron with wires SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We explore the possibility of compensating long-range beam-beam interactions in the Tevatron by current carrying wires. Compensation strategies depend on whether the compensation is done close to the interaction or nonlocally, on the aspect ratio of the strong beam and on other details. Strategies for each case have been developed and applied to the Tevatron. We discuss the results of these strategies at injection and collision energy. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Sen, T (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2905 EP 2907 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202225 ER PT B AU Ben-Zvi, I Litvinenko, V Barton, D Beavis, D Blaskiewicz, M Brennan, J Burrill, A Calaga, R Cameron, P Chang, X Connolly, R Eidelman, Y Fedotov, A Fischer, W Gassner, D Hahn, H Harrison, M Hershcovitch, A Hseuh, HC Jain, A Johnson, P Kayran, D Kewisch, J Lambiase, R Mackay, W Mahler, G Malitsky, N McIntyre, G Meng, W Mirabella, K Montag, C Nehring, T Nicoletti, A Oerter, B Parzen, G Pate, D Rank, J Roser, T Russo, T Scaduto, J Smith, K Rao, T Trbojevic, D Wang, G Wei, J Williams, N Wu, KC Yakimenko, V Zaltsman, A Zhao, Y Bluem, H Burger, A Cole, M Favale, A Holmes, D Rathke, J Schultheiss, T Todd, A Koop, I Parkhomchuk, V Shatunov, Y Skrinsky, A Sekutowicz, J Burov, A Nagaitsev, S Meshkov, I Sidorin, A Smirnov, A Troubnikov, G Abell, D Bruhwiler, D Delayen, J Derbenev, Y Funk, W Kneisel, P Merminga, L Phillips, L Preble, J AF Ben-Zvi, I Litvinenko, V Barton, D Beavis, D Blaskiewicz, M Brennan, J Burrill, A Calaga, R Cameron, P Chang, X Connolly, R Eidelman, Y Fedotov, A Fischer, W Gassner, D Hahn, H Harrison, M Hershcovitch, A Hseuh, HC Jain, A Johnson, P Kayran, D Kewisch, J Lambiase, R Mackay, W Mahler, G Malitsky, N McIntyre, G Meng, W Mirabella, K Montag, C Nehring, T Nicoletti, A Oerter, B Parzen, G Pate, D Rank, J Roser, T Russo, T Scaduto, J Smith, K Rao, T Trbojevic, D Wang, G Wei, J Williams, N Wu, KC Yakimenko, V Zaltsman, A Zhao, Y Bluem, H Burger, A Cole, M Favale, A Holmes, D Rathke, J Schultheiss, T Todd, A Koop, I Parkhomchuk, V Shatunov, Y Skrinsky, A Sekutowicz, J Burov, A Nagaitsev, S Meshkov, I Sidorin, A Smirnov, A Troubnikov, G Abell, D Bruhwiler, D Delayen, J Derbenev, Y Funk, W Kneisel, P Merminga, L Phillips, L Preble, J GP IEEE TI Electron cooling of RHIC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We report progress on the R&D program for electron-cooling of the Relativistic Heavy Ion Collider (RHIC). This electron cooler is designed to cool 100 GeV/nucleon at storage energy using 54 MeV electrons. The electron source will be a superconducting RF photocathode gun. The accelerator will be a superconducting energy recovery linac. The frequency of the accelerator is set at 703.75 MHz. The maximum electron bunch frequency is 9.38 MHz, with bunch charge of 20 nC. The R&D program has the following components: The photoinjector and its photocathode, the superconducting linac cavity, start-to-end beam dynamics with magnetized electrons, electron cooling calculations including benchmarking experiments and development of a large superconducting solenoid. The photoinjector and linac cavity are being incorporated into an energy recovery linac aimed at demonstrating ampere class current at about 20 MeV. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Ben-Zvi, I (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM ilan@bnl.gov RI Lambiase, Robert/E-1934-2013; Kayran, Dmitry/E-1876-2013; Smirnov, Alexander/E-3709-2014; Parkhomchuk, Vasily/B-3835-2017 OI Kayran, Dmitry/0000-0002-1156-4384; Parkhomchuk, Vasily/0000-0001-5833-0051 NR 28 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2908 EP 2910 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202226 ER PT B AU Bai, M Huang, H MacKay, WW Pitisyn, V Roser, T Tepikian, S Lee, SY Lin, F AF Bai, M Huang, H MacKay, WW Pitisyn, V Roser, T Tepikian, S Lee, SY Lin, F GP IEEE TI Observations of snake resonance in RHIC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Siberian snakes now become essential in the polarized proton acceleration. With proper configuration of Siberian snakes, the spin precession tune of the beam becomes 1/2 which avoids all the spin depolarizing resonance. However, the enhancement of the perturbations on the spin motion can still occur when the spin precession tune is near some low order fractional numbers, called snake resonances, and the beam can be depolarized when passing through the resonance. The snake resonances have been confirmed in the spin tracking calculations, and observed in RHIC with polarized proton beam. Equipped with two full Siberian snakes in each ring, RHIC provides us a perfect facility for snake resonance studies. This paper presents latest experimental results. New insights Lire also discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Bai, M (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2911 EP 2913 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202227 ER PT B AU Luo, Y Pilat, F Peggs, S Trbojevic, D Roser, T AF Luo, Y Pilat, F Peggs, S Trbojevic, D Roser, T GP IEEE TI Principle of global decoupling with coupling angle modulation SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The global betatron decoupling on the ramp is an important issue for the operation of the Relativistic Heavy Ion Collider (RHIC). A new scheme, coupling angle modulation, was found. By modulating two orthogonal skew quadrupole families, an extra rotating coupling is introduced into the coupled machine. The skew quadrupole modulation frequency is about 0.2Hz for the RHIC ramp, and 0.5Hz at injection and store. The eigentune changes are tracked with a high resolution phase lock loop (PLL) tune measurement system. The global coupling correction strengths are determined by the modulation skew quadrupole strengths at the minimum eigentune split multiplied by a factor k. k is determined by the uncoupled eigentune split and the maximum and the minimum tune split during the skew quadrupole modulation. This decoupling scheme is fast and robust. It had been verified at the RHIC and has been applied for the RHIC global decoupling on the ramp. In this article, the principle of the coupling angle modulation is presented in detail. Simulation results are also shown. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Luo, Y (reprint author), Brookhaven Natl Lab, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2923 EP 2925 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202231 ER PT B AU Luo, Y Cameron, P Dellapenna, A Marusic, A Peggs, S Roser, T Trbojevic, D Jones, R AF Luo, Y Cameron, P Dellapenna, A Marusic, A Peggs, S Roser, T Trbojevic, D Jones, R GP IEEE TI Possible phase loop for the global decoupling SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The two eigentunes Q(I) and Q(II), two eigenmode amplitude ratios R-I and R-II, and two eignmode phase differences Delta phi(I) and Delta phi(II), are defined as the coupling observables for the linear weak difference betatron coupling. Simulations were carried out to investigate their behaviors in global decoupling scans. It was found that the amplitude ratios R-I,R-II are more sensitive than the tune split when the decoupling scan is approaching the global uncoupled point, and that the phase differences Delta phi(I,II), tell the right global decoupling direction, the right strength combination of the skew quadrupoles or families. The analytical solution to these six coupling observables is calculated through both the strict matrix approach and the perturbation Hamiltonian approach. The constant phase differences in the right decoupling direction hint a possible global decoupling phase loop. Dedicated beam experiments were carried out at the Relativistic Heavy Ion Collider (RHIC). The preliminary results from the beam experiments are presented. These six parameters can be used for the global decoupling in feedback mode, especially on the non-stop energy ramp. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Luo, Y (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 9 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2926 EP 2928 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202232 ER PT B AU Luo, Y Bai, M Pilat, F Satogata, T Trbojevic, D AF Luo, Y Bai, M Pilat, F Satogata, T Trbojevic, D GP IEEE TI IR optics measurement with linear coupling's action-angle parameterization SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A parameterization of linear coupling in action-angle coordinates is convenient for analytical calculations and interpretation of turn-by-turn (TBT) beam position monitor (BPM) data. We demonstrate how to use this parameterization to extract the twiss and coupling parameters in interaction regions (IRs), using BPMs on each side of the long IR drift region. The example of TBT BPM analysis was acquired at the Relativistic Heavy Ion Collider (RHIC), using an AC dipole to excite a single eigenmode. Besides the full treatment, a fast estimate of beta*, the beta function at the interaction point (IP), is provided, along with the phase advance between these BPMs. We also calculate and measure the waist of the beta function and the local optics. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Luo, Y (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2929 EP 2931 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202233 ER PT B AU Montag, C He, P Jia, L Nicoletti, A Satogata, T Schmalzle, J Tallerico, T AF Montag, C He, P Jia, L Nicoletti, A Satogata, T Schmalzle, J Tallerico, T GP IEEE TI Helium flow induced orbit jitter at RHIC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Horizontal beam orbit jitter at frequencies around 10 Hz has been observed in RHIC for several years. The distinct frequencies of this jitter have been found at superconducting low-beta quadrupole triplets around the ring, where they coincide with mechanical modes of the cold masses. Recently, we have identified liquid helium flow as the driving force of these oscillations. 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2932 EP 2934 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202234 ER PT B AU Montag, C Michnoff, R Satogata, T Schultheiss, C Marusic, A Roser, T AF Montag, C Michnoff, R Satogata, T Schultheiss, C Marusic, A Roser, T GP IEEE TI Fast IR orbit feedback at RHIC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Mechanical low-beta triplet vibrations lead to horizontal jitter of RHIC beams at frequencies around 10 Hz. The resulting beam offsets at the interaction points are considered detrimental to RHIC luminosity performance. To stabilize beam orbits at the interaction points, installation of a fast orbit feedback is foreseen. A prototype of this system is being developed and tested. Recent results will be presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Montag, C (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2935 EP 2937 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202235 ER PT B AU Montag, C AF Montag, C GP IEEE TI Electron beam stability requirements for linac-ring electron-ion colliders SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In recent years, linac-ring electron-ion colliders have been proposed at a number of laboratories around the world. While the linac-ring approach overcomes the beam-beam tuneshift limitation on the electron beam, it also introduces noise into the ion beam, via the beam-beam interaction with electron bunches of slightly fluctuating intensity and transverse size. The effect of these fluctuations is studied using a linearized model of the beam-beam interaction. Upper limits for the rms jitter amplitudes of electron beam parameters for various linac-ring electron-ion colliders are presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Montag, C (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2938 EP 2940 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202236 ER PT B AU Montag, C AF Montag, C GP IEEE TI Beam-beam simulations for the eRHIC electron ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB To study collisions between polarized electrons and heavy ions or polarized protons at high energy, adding a 10 GeV electron storage ring to the existing RHIC facility is currently under consideration. To achieve high luminosities of several 10(33) cm(-2)sec(-1) range, a vertical beam beam tuneshift parameter of xi(y) = 0.08 is required for the electron beam. Simulation studies are being performed to study the feasibility of this high tuneshift parameter and explore the potential for even higher tuneshifts. Recent results of these studies are presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Montag, C (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2941 EP 2943 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202237 ER PT B AU Montag, C Malitsky, N Ben-Zvi, I Litvinenko, V AF Montag, C Malitsky, N Ben-Zvi, I Litvinenko, V GP IEEE TI Beam-beam simulations for double-gaussian beams SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Electron cooling together with intra-beam scattering results in a transverse distribution that can best be described by a sum of two gaussians, one for the high-density core and one for the tails of the distribution [I]. Simulation studies are being performed to understand the beam-beam interaction of these double-gaussian beams. Here we report the effect of low-frequency random tune modulations on diffusion in double-gaussian beams and compare the effects to those in beam-beam interactions with regular gaussian beams and identical tune shift parameters. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Montag, C (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2944 EP 2946 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202238 ER PT B AU Zolotorev, M Commins, ED Denes, P Heifets, S Hussain, Z Lebedev, GV Lidia, SM Robin, DS Sannibale, F Schoenlein, RW Vogel, R Wan, W AF Zolotorev, M Commins, ED Denes, P Heifets, S Hussain, Z Lebedev, GV Lidia, SM Robin, DS Sannibale, F Schoenlein, RW Vogel, R Wan, W GP IEEE TI An ultra-bright pulsed electron beam with low longitudinal emittance SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Most existing electron sources extract electrons from conductors. Since the actual temperature inside the conductor is much less than the Fermi temperature of the conduction electrons, the electron degeneracy delta(f) is close to 1, the maximum allowed by the Pauli exclusion principle. However, during extraction several factors conspire together to reduce delta(f) many orders of magnitude, Limiting the achieved values to approximate to 10(-5). A new concept is described for building a novel electron source designed to produce a pulsed beam with delta(f) approximate to 10(-3) and longitudinal emittance four orders of magnitude smaller than currently achieved values. This high brightness, low longitudinal emittance regime enables a wide range of novel applications that utilize angstrom-scale spatial resolution and eV-scale energy resolution. The current state of a proof-of-principle experiment conducted at LBNL is also described. C1 LBNL, Berkeley, CA 94720 USA. RP Zolotorev, M (reprint author), LBNL, Berkeley, CA 94720 USA. EM max_zolotorev@lbl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2947 EP 2949 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202239 ER PT B AU Podobedov, B Krinsky, S AF Podobedov, B Krinsky, S GP IEEE TI Transverse impedance of elliptical tapers SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB For a slowly tapered vacuum chamber with confocal elliptical cross-section, results obtained with the ABCI and GdfidL electromagnetic simulators are compared with analytic estimates for the transverse impedance at zero frequency. In the limits of round and flat chambers, we discuss the conditions for validity of the analytic approximations of Yokoya and Stupakov. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. RP Podobedov, B (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. EM boris@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2983 EP 2985 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202251 ER PT B AU Ng, KY AF Ng, KY GP IEEE TI Stability of barrier buckets with short or zero barrier separations SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A barrier bucket with very short or zero rf-barrier separation (relative to the barrier widths) has its synchrotron tune decreasing from a very large value towards the bucket boundary. As a result, chaotic region may form near the bucket center and extends outward under increasing modulation of rf voltage and/or rf phase. Application is made to those barrier buckets used in momentum mining at the Fermilab Recycler Ring. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ng, KY (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM ng@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2986 EP 2988 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202252 ER PT B AU Li, R Derbenev, YS AF Li, R Derbenev, YS GP IEEE TI Discussions on the cancellation effect on a circular orbit SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE C1 Jefferson Lab, Newport News, VA 23606 USA. RP Li, R (reprint author), Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 23606 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2989 EP 2991 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202253 ER PT B AU Pozdeyev, E Marti, F York, RC Rodriguez, J AF Pozdeyev, E Marti, F York, RC Rodriguez, J GP IEEE TI Future plans for the small isochronous ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Small Isochronous Ring (SIR) has been operational at Michican State University since December 2003. It has been used for experimental studies of the beam dynamics in high-intensity isochronous cyclotrons and synchrotrons at the transition energy. Operational experience with SIR has demonstrated that the ring can be successfully used to study space charge effects in accelerators. The low velocity of beam particles in the ring allowed longitudinal profile measurements with an accuracy that would be difficult to achieve in full-size accelerators. The experimental data obtained in the ring was used for validation of the multiparticle, space-charge codes CYCO and WARP3D. Encouraged by the success of SIR in the isochronous regime, we consider options for expanding the scope of the beam physics studied in the ring. In this paper, we outline possible future experiments and discuss required modifications of the ring optics and hardware. C1 JLab, Newport News, VA 23606 USA. RP Pozdeyev, E (reprint author), JLab, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2992 EP 2994 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202254 ER PT B AU Nelson, EM Petillo, JJ AF Nelson, EM Petillo, JJ GP IEEE TI Tests of a 3d self magnetic field solver in the finite element gun code MICHELLE SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID ELECTRON-GUN AB We present some tests of a new prototype three-dimensional (3d) self magnetic field solver in the finite-element gun code MICHELLE. The first test is a fixed ray of current in a square drift tube. The magnetic field converges linearly or quadratically with element size when using a linear or quadratic basis, respectively. The second test is a relativistic axisymmetric laminar beam expanding freely in a round drift tube. The self-consistent solution for the particle trajectories is accurate. The third test transports a beam in a uniform external magnetic field. There is no indication of beam filamentation. The computational costs for the self magnetic field solver are higher than for the Poisson solver, but the costs are still acceptable in many applications. C1 LANL, Los Alamos, NM 87545 USA. RP Nelson, EM (reprint author), LANL, Los Alamos, NM 87545 USA. EM enelson@lanl.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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 2995 EP 2997 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202255 ER PT B AU Fischer, W Satogata, T Tomas, R AF Fischer, W Satogata, T Tomas, R GP IEEE TI Measurement of transverse echoes in RHIC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Beam echoes are a very sensitive method to measure diffusion, and longitudinal echo measurements were performed in a number of machines. In RHIC, for the first time, a transverse beam echo was observed after applying a dipole kick followed by a quadrupole kick. After application of the dipole kick, the dipole moment decohered completely due to lattice nonlinearities. When a quadrupole kick is applied at time tau after the dipole kick, the beam re-cohered at time 2 tau thus showing an echo response. We describe the experimental setup and measurement results. In the measurements the dipole and quadrupole kick amplitudes, amplitude dependent tune shift, and the time between dipole and quadrupole kick were varied. In addition, measurements were taken with gold bunches of different intensities. These should exhibit different transverse diffusion rates clue to intra-beam scattering. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fischer, W (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM Wolfrarn.Fischer@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3001 EP 3003 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202257 ER PT B AU Aseev, VN Ostroumov, PN Lessner, ES Mustapha, B AF Aseev, VN Ostroumov, PN Lessner, ES Mustapha, B GP IEEE TI Track: The new beam dynamics code SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The new ray-tracing code TRACK originally developed to fulfill the special requirements of the RIA accelerator systems is a general beam dynamics code. It is currently being used for the design and simulation of future proton and heavy-ion linacs at several Labs. This paper presents a general description of the code TRACK emphasizing its main new features and recent updates. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Aseev, VN (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM brahim@anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3004 EP 3006 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202258 ER PT B AU Mustapha, B Aseev, VN Ostroumov, PN Qiang, J Ryne, RD AF Mustapha, B Aseev, VN Ostroumov, PN Qiang, J Ryne, RD GP IEEE TI RIA beam dynamics: Comparing track to impact SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB To benchmark the newly developed beam dynamics code TRACK we have performed comparisons with well established existing codes. This paper presents a detailed comparison of the beam dynamics simulation in the RIA driver linac between the codes TRACK and IMPACT. After updating the code IMPACT to support the special requirements of the RIA driver linac, a very good agreement was obtained which represents another validation of both codes. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Mustapha, B (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM brahim@anl.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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3007 EP 3009 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202259 ER PT B AU Chu, P Danilov, V Jeon, D Plum, M AF Chu, P Danilov, V Jeon, D Plum, M GP IEEE TI Transverse beam matching application for SNS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB An automated transverse beam matching application has been developed for the Spallation Neutron Source (SNS) beam transport lines. The application is written within the XAL Java framework and the matching algorithm is based on the simplex optimization method. Other functionalities, such as emittance calculated from profile monitor measurements (adopted from a LANL Fortran code), profile monitor display, and XAL on-line model calculation, are also provided by the application. Test results obtained during the SNS warm linac commissioning will be reported. A comparison between the emittances obtained from this application and an independent Trace-3D routine will also be shown. C1 Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 USA. RP Chu, P (reprint author), Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3010 EP 3012 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202260 ER PT B AU Holmes, JA Danilov, VV Cousineau, SM AF Holmes, JA Danilov, VV Cousineau, SM GP IEEE TI Painting self-consistent beam distributions in rings SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We define self-consistent beam distributions to have the following properties: 1) time-independence or periodicity, 2) linear space charge forces, and 3) maintainance of their defining shape and density under all linear transformations. The periodic condition guarantees zero space-charge-induced halo growth and beam loss during injection. Some self-consistent distributions can be manipulated into flat, or possibly even point-like, beams, which makes them interesting to colliders and to heavy-ion fusion. This paper discusses methods for painting 2D and 3D self-consistent distributions and for their manipulation to produce flat and point-like beams. C1 Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 USA. RP Holmes, JA (reprint author), Oak Ridge Natl Lab, SNS, POB 2008, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3013 EP 3015 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202261 ER PT B AU Holmes, J Danilov, V Jain, L AF Holmes, J Danilov, V Jain, L GP IEEE TI Transverse stability studies of the SNS ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Detailed studies of the transverse stability of the SNS ring have been carried out for realistic injection scenarios. For coasting beam models and single harmonic impedances, analytic and computational results including phase slip, chromaticity, and space charge are in excellent agreement. For the dominant extraction kicker impedance and bunched beams resulting from injection, computationally determined stability thresholds are significantly higher than for coasting beams. C1 Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37830 USA. RP Holmes, J (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3016 EP 3018 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202262 ER PT B AU Efthimion, PC Gilson, EP Grisham, L Davidson, RC AF Efthimion, PC Gilson, EP Grisham, L Davidson, RC GP IEEE TI Ferroelectric plasma source for heavy ion beam charge neutralization SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Plasmas are employed as a source of unbound electrons for charge neutralizing heavy ion beams to allow them to focus to a small spot size. Calculations suggest that plasma at a density of 1-100 times the ion beam density and at a length similar to 0.1-1 in would be suitable. To produce one-meter plasma, large-volume plasma sources based upon ferroelectric ceramics are being developed. These sources have the advantage of being able to increase the length of the plasma and operate at low neutral pressures. The source utilizes the ferroelectric ceramic BaTiO(3) to form metal plasma. The drift tube inner surface of the Neutralized Drift Compression Experiment (NDCX) will be covered with ceramic, and high voltage (similar to 1-5 kV) applied between the drift tube and the front surface of the ceramic by placing a wire grid on the front surface. A prototype ferroelectric source 20 cm long has produced plasma densities of 5x10(11) cm(-3). The source was integrated into the previous Neutralized Transport Experiment (NTX), and successfully charge neutralized the K(+) ion beam. Presently, the one-meter source is being fabricated. The source is being characterized and will be integrated into NDCX for charge neutralization experiments. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Efthimion, PC (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3028 EP 3030 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202266 ER PT B AU Gilson, EP Chung, M Davidson, RC Efthimion, PC Majeski, R Startsev, EA AF Gilson, EP Chung, M Davidson, RC Efthimion, PC Majeski, R Startsev, EA GP IEEE TI Simulating the long-distance propagation of intense beams in the Paul Trap Simulator Experiment SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Paul Trap Simulator Experiment (PTSX) makes use of a compact Paul trap configuration with quadrupolar oscillating wall voltages to simulate the propagation of intense charged particle beams over distances of many kilometers through magnetic alternating-gradient transport systems. The simulation is possible because of the similarity between the transverse dynamics of particles in the two systems. One-component pure cesium ion plasmas have been trapped that correspond to normalized intensity parameters (s) over cap < 0.8, where (s) over cap is the ratio of the square of the on-axis plasma frequency to twice the square of the average transverse focusing frequency. The PTSX device confines the plasma for hundreds of milliseconds, which is equivalent to beam propagation over tens of kilometers. Results are presented for experiments in which the amplitude of the oscillating wall voltage waveform has been modified as a function of time. Changing the amplitude for an integral number N of half-cycles and then restoring the amplitude to its original value affects the plasma in a manner that is non-monotonic with N. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Gilson, EP (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. EM egilson@pppl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3031 EP 3033 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202267 ER PT B AU Parsa, Z Goncharov, A Zadorozhny, V AF Parsa, Z Goncharov, A Zadorozhny, V GP IEEE TI Actual stationary state for plasma lens SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID BEAMS AB The electrostatic plasma tens (PL) provides an attractive and unique tool for manipulating and controlling the high-current heavy ion beams. The concept of the PL is based on using the magnetically insulated electrons and equipotentialization of magnetic field lines. Today, the applications of PL are, however limited. The reason is that estimating the behavior of electrons for complicated magnetic fields runs into severe difficulties. We show that there are specific conditions that admit steady-state of a longitudinal motion, and consider the question of its stability. These results are needed to develop an optimized PL with minimal spherical aberration, in part by optimizing the magnetic field configuration in the low-magnetic-field range. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Parsa, Z (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM parsa@bnl.gov; zvf@compuserv.com.ua 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3040 EP 3041 PG 2 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202270 ER PT B AU Dooling, JC Brumwell, FR McMichael, GE Wang, S AF Dooling, JC Brumwell, FR McMichael, GE Wang, S GP IEEE TI Observations of UHF oscillations in the IPNS RCS proton bunch SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID SYNCHROTRON MOTION; BEAM AB The Intense Pulsed Neutron Source (IPNS) Rapid Cycling Synchrotron (RCS) accelerates 3.2x10E(12) protons from 50 MeV to 450 MeV in a single bunch (h=1) at 30 Hz. The rf frequency varies from 2.21 MHz to 5.14 MHz during the 14.2 ms acceleration interval. To maintain stability of the bunch, phase modulation is introduced to the rf at approximately twice the synchrotron frequency (synchrotron tune is 0.0014). This phase modulation causes a parametric quadrupole oscillation to develop in the bunch, and as this occurs, the bunch spectrum shows a significant increase in high frequency content. Without phase modulation, the beam experiences an instability which results in the loss of a large fraction of the charge 2-4 ms prior to extraction. It is unclear if the stability imparted to the beam by phase modulation comes from the quadrupole oscillation or from the high frequency excitation. A longitudinal tracking code has been modified to include amplitude and phase modulation of the bunch. The numerical analysis is used to compare growth rates with those observed in the machine. The results of this analysis will be important as we introduce second harmonic rf with a new third cavity in the RCS later in 2005. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Dooling, JC (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM jcdooling@anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3072 EP 3074 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202281 ER PT B AU Amundson, J Spentzouris, P AF Amundson, J Spentzouris, P GP IEEE TI Space charge experiments and simulation in the Fermilab Booster SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We have studied space charge effects in the Fermilab Booster. Our studies include investigation of coherent and incoherent tune shifts and halo formation. We compare experimental results with simulations using the 3-D space charge package Synergia. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Amundson, J (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM amundson@fnal.gov; spentz@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3078 EP 3080 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202283 ER PT B AU Spentzouris, P Amundson, J Dechow, D AF Spentzouris, P Amundson, J Dechow, D GP IEEE TI Overview of the synergia 3-D multi-particle dynamics modeling framework SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB High precision modeling of space-charge effects is essential for designing future accelerators as well as optimizing the performance of existing machines. Synergia is a high-fidelity parallel beam dynamics simulation package with fully three dimensional space-charge capabilities and a higher-order optics implementation. We describe the Synergia framework and model benchmarks we obtained by comparing to semi-analytic results and other codes. We also present Synergia simulations of the Fermilab Booster accelerator and comparisons with experiment. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Spentzouris, P (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM spentz@fnal.gov NR 8 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3081 EP 3083 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202284 ER PT B AU Anderson, OA AF Anderson, OA GP IEEE TI Accurate iterative analysis of the K-V equations SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Those working with alternating-gradient (A-G) systems look for simple, accurate ways to analyze A-G performance for matched beams. The useful K-V equations [1] are easily solved in the smooth approximation [2], [3], [4]. This approximate solution becomes quite inaccurate for applications with large focusing fields and phase advances. Results of efforts to improve the accuracy [5], [6] have tended to be indirect or complex. Our generalizations presented previously [7] gave better accuracy in a simple explicit format. However, the method used to derive our results (expansion in powers of a small parameter) was complex and hard to follow; also, reference [7] only gave low-order correction formulas. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Anderson, OA (reprint author), Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3084 EP 3086 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202285 ER PT B AU Huang, Z Dowell, D Emma, P Limborg-Deprey, C Stupakov, G Wu, J AF Huang, Z Dowell, D Emma, P Limborg-Deprey, C Stupakov, G Wu, J GP IEEE TI Uncorrelated energy spread and longitudinal emittance of a photoinjector beam SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID GUN TEST FACILITY; LASER AB Longitudinal phase space properties of a photoinjector beam are important in many areas of high-brightness beam applications such as bunch compression, transverse-to-longitudinal emittance exchange, and high-gain free-electron lasers. In this paper, we discuss both the rf and the space charge contributions to the uncorrelated energy spread of the beam generated from a laser-driven rf gun. We compare analytical expressions for the uncorrelated energy spread and the longitudinal emittance with numerical simulations and recent experimental results. 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 13 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3087 EP 3089 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202286 ER PT B AU Ranjbar, VH AF Ranjbar, VH GP IEEE TI Damping transverse instabilities in the tyevatronusingac chromaticity SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Several papers [1],[2] have suggested possibility of using varying chromaticity to damp the head-tail instability. We test this by cycling the chromaticity sextupole magnets in the Tevatron near the synchrotron frequency to see if the head-tail stability threshold is increased. Further we compare the turn-by-turn evolution of a bunch slice in the presence of varying chromaticity to a model previously developed. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ranjbar, VH (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3090 EP 3091 PG 2 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202287 ER PT B AU Sefkow, AB Davidson, RC Efthimion, PC Gilson, EP Yu, SS Roy, PK Eylon, S Bieniosek, FM Henestroza, E Kwan, JW Coleman, JE Waldron, WL Greenway, WG Vanecek, DL Welch, DR AF Sefkow, AB Davidson, RC Efthimion, PC Gilson, EP Yu, SS Roy, PK Eylon, S Bieniosek, FM Henestroza, E Kwan, JW Coleman, JE Waldron, WL Greenway, WG Vanecek, DL Welch, DR GP IEEE TI A fast Faraday cup for the neutralized drift compression experiment SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Heavy ion drivers for high energy density physics applications and inertial fusion energy use space-charge-dominated beams which require longitudinal bunch compression in order to achieve sufficiently high beam intensity at the target. The Neutralized Drift Compression Experiment-1A (NDCX-1A) at Lawrence Berkeley National Laboratory (LBNL) is used to determine the effective limits of neutralized drift compression. NDCX-1A investigates the physics of longitudinal drift compression of an intense ion beam, achieved by imposing an initial velocity tilt on the drifting beam and neutralizing the beam's space-charge with background plasma. Accurately measuring the longitudinal compression of the beam pulse with high resolution is critical for NDCX-1A, and an understanding of the accessible parameter space is modeled using the Lsp particle-in-cell (PIC) code. The design and preliminary experimental results for an ion beam probe which measures the total beam current at the focal plane as a function of time are summarized. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Sefkow, AB (reprint author), Princeton Univ, Plasma Phys Lab, 1 Cyclotron Rd, Princeton, NJ 08543 USA. EM asefkow@pppl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3098 EP 3100 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202290 ER PT B AU Startsev, EA Davidson, RC Lee, WL AF Startsev, EA Davidson, RC Lee, WL GP IEEE TI Numerical studies of electromagnetic instabilities in intense charged particle beams with large energy anisotropy SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID RELATIVISTIC ELECTRON-BEAMS; FILAMENTATION; PLASMAS AB In intense charged particle beams with large energy anisotropy, free energy is available to drive transverse electromagnetic Weibel-type instabilities. Such slow-wave transverse electromagnetic instabilities can be described by the so-called Darwin model, which neglects the fast-wave portion of the displacement current. The Weibel instability may also lead to an increase in the longitudinal velocity spread, which would make the focusing of the beam difficult and impose a lit-nit on the minimum spot size achievable in heavy ion fusion experiments. This paper reports the results of recent numerical studies of the Weibel instability using the Beam Eigenmode And Spectra (bEASt) code for space-charge-dominated, low-emittance beams with large tune depression. To study the nonlinear stage of the instability, the Darwin model is being developed and incorporated into the Beam Equilibrium Stability and Transport(BEST) code. 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 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3101 EP 3103 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202291 ER PT B AU Kabel, A Cai, Y Sen, T AF Kabel, A Cai, Y Sen, T GP IEEE TI Long-term simulation of beam-beam effects in the Tevatron at collision energy SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The beam-beam effect is a significant source of nonlinearities in the Tevatron. We have developed a code which allows us to estimate its contribution to the finite lifetime of the anti-proton beam, both at collision and injection energy, by tracking realistic particle distribution for a high number of terms and extrapolating from the particle loss rate. We describe the physical modeling underlying the code and give benchmarking results. C1 SLAC, Menlo Pk, CA 94025 USA. RP Kabel, A (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM akabel@stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3107 EP 3109 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202293 ER PT B AU Wei, J Iriso, U Bai, M Blaskiewicz, M Cameron, P Connolly, R Della Penna, A Fischer, W Huang, H Lee, R Michnoff, R Ptitsyn, V Roser, T Satogata, T Tepikian, S Wang, L Zhang, SY AF Wei, J Iriso, U Bai, M Blaskiewicz, M Cameron, P Connolly, R Della Penna, A Fischer, W Huang, H Lee, R Michnoff, R Ptitsyn, V Roser, T Satogata, T Tepikian, S Wang, L Zhang, SY GP IEEE TI Observation of electron-ion effects at RHIC transition SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Electron cloud is found to be a serious obstacle on the upgrade path of the Relativistic Heavy Ion Collider (RHIC). At twice the design number of bunches, electronion interactions cause significant instability, emittance growth, and beam loss along with vacuum pressure rises when the beam is accelerated across the transition. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Wei, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM jwei@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3122 EP 3124 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202298 ER PT B AU Fedotov, AV Ben-Zvi, I Litvinenko, VN Sidorin, A Smirnov, A Trubnikov, G AF Fedotov, AV Ben-Zvi, I Litvinenko, VN Sidorin, A Smirnov, A Trubnikov, G GP IEEE TI Cooling dynamics studies and scenarios for the RHIC cooler SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In this paper, we discuss various electron cooling dynamics studies for RHIC. We also present simulations [1] of various possibilities of using electron cooling at RHIC, which includes cooling at the top energy, precooling at low energy, aspects of transverse and longitudinal cooling and their impact on the luminosity. Electron cooling at various collision energies both for heavy ions and protons is also discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fedotov, AV (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM fedotov@bnl.gov RI Smirnov, Alexander/E-3709-2014 NR 7 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3143 EP 3145 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202305 ER PT B AU Fedotov, AV Ben-Zvi, I Eidelman, Y Litvinenko, VN Malitsky, N Meshkov, I Sidorin, A Smirnov, A Trubnikov, G Bruhwiler, DL AF Fedotov, AV Ben-Zvi, I Eidelman, Y Litvinenko, VN Malitsky, N Meshkov, I Sidorin, A Smirnov, A Trubnikov, G Bruhwiler, DL GP IEEE TI Simulations of high-energy electron cooling SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB High-energy electron cooling of RHIC presents many unique features and challenges. An accurate estimate of the cooling times requires a detailed calculation of the cooling process, which takes place simultaneously with various diffusive mechanisms in RHIC. In addition, many unexplored effects of high-energy cooling in a collider complicate the task of getting very accurate estimates of cooling times. To address these high-energy cooling issues, a detailed study of cooling dynamics based on computer codes is underway at Brookhaven National Laboratory. In this paper, we present an update on code development and its application to the high-energy cooling dynamics studies for RHIC. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fedotov, AV (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM fedotox@bnl.gov RI Smirnov, Alexander/E-3709-2014 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3146 EP 3148 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202306 ER PT B AU Fedotov, AV Ben-Zvi, I Eidelman, Y Litvinenko, VN Parzen, G Sidorin, A Smirnov, A Trubnikov, G AF Fedotov, AV Ben-Zvi, I Eidelman, Y Litvinenko, VN Parzen, G Sidorin, A Smirnov, A Trubnikov, G GP IEEE TI IBS for ion distribution under electron cooling SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Standard models of the intra-beam scattering (IBS) are based on the growth of the rms beam parameters for a Gaussian distribution. As a result of electron cooling, the core of beam distribution is cooled much faster than the tails, producing a denser core. In this paper, we compare various approaches to IBS treatment for such distribution. Its impact on the luminosity is also discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fedotov, AV (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM fedotov@bnl.gov RI Smirnov, Alexander/E-3709-2014 NR 10 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3149 EP 3151 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202307 ER PT B AU Fedotov, AV Ben-Zvi, I Litvinenko, VN Bruhwiler, DL Abell, DT Busby, R Schoessow, P AF Fedotov, AV Ben-Zvi, I Litvinenko, VN Bruhwiler, DL Abell, DT Busby, R Schoessow, P GP IEEE TI Numerical studies of the friction force for the RHIC electron cooler SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Accurate calculation of electron cooling times requires an accurate description of the dynamical friction force. The proposed RHIC cooler Will require similar to 55 MeV electrons, Which must be obtained from an RF linac, leading to very high transverse electron temperatures. A strong solenoid will be used to magnetize the electrons and suppress the transverse temperature, but the achievable magnetized cooling logarithm will not be large. In this paper, we explore the magnetized friction force for parameters of the RHIC cooler, using the VORPAL code [1]. VORPAL can simulate dynamical friction and diffusion coefficients directly from first principles [2]. Various aspects of the friction force are addressed for the problem of high-energy electron cooling in the MIC regime. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fedotov, AV (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM fedotov@bnl.gov NR 9 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3152 EP 3154 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202308 ER PT B AU Pilat, F Ahrens, L Bai, M Barton, DS Beebe-Wang, J Blaskiewicz, M Brennan, JM Bruno, D Cameron, P Connolly, R DeLong, J D'Ottavio, T Drees, A Fischer, W Ganetis, G Gardner, C Glenn, J Harvey, P Hayes, T Hseuh, HC Huang, H Ingrassia, P Iriso, U Lee, R Litvinenko, VN Luo, Y MacKay, WW Marr, G Marusic, A Michnoff, R Montag, C Morris, J Nicoletti, A Oerter, B Ptitsyn, V Roser, T Russo, T Sandberg, J Satogata, T Schultheiss, C Tepikian, S Tomas, R Trbojevic, D Tsoupas, NT Tuozzolo, J Vetter, K Zaltsman, A Zeno, K Zhang, SY Zhang, W AF Pilat, F Ahrens, L Bai, M Barton, DS Beebe-Wang, J Blaskiewicz, M Brennan, JM Bruno, D Cameron, P Connolly, R DeLong, J D'Ottavio, T Drees, A Fischer, W Ganetis, G Gardner, C Glenn, J Harvey, P Hayes, T Hseuh, HC Huang, H Ingrassia, P Iriso, U Lee, R Litvinenko, VN Luo, Y MacKay, WW Marr, G Marusic, A Michnoff, R Montag, C Morris, J Nicoletti, A Oerter, B Ptitsyn, V Roser, T Russo, T Sandberg, J Satogata, T Schultheiss, C Tepikian, S Tomas, R Trbojevic, D Tsoupas, NT Tuozzolo, J Vetter, K Zaltsman, A Zeno, K Zhang, SY Zhang, W GP IEEE TI Operations and performance of RHIC as a Cu-Cu collider SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The 5(th) year of RHIC operations, started in November 2004 and expected to last till June 2005, consists of a physics run with Cu-Cu collisions at 100 GeV/u followed by one with polarized protons (pp) at 100 GeV [1]. We will address here the overall performance of the REIC complex used for the first time as a Cu-Cu collider, and compare it with previous operational experience with Au, PP and asymmetric d-Au collisions. We will also discuss operational improvements, Such as a * squeeze to 85cm in the high luminosity interaction regions from the design value of 1m, system improvements, machine performance and limitations, and address reliability and uptime issues. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Pilat, F (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 16 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3155 EP 3157 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202309 ER PT B AU Luciano, N Nass, A Makdisi, Y Thieberger, P Trbojevic, D Zelenski, A AF Luciano, N Nass, A Makdisi, Y Thieberger, P Trbojevic, D Zelenski, A GP IEEE TI Luminescence beam profile monitor for the RHIC polarized hydrogen jet polarimeter SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A new polarized hydrogen jet target was used to provide improved beam polarization measurements during die second polarized proton run in the Relativistic Heavy Ion Collider (RHIC). The luminescence produced by beam-hydrogen excitations was also used to test the feasibility of a new beam profile monitor for RHIC based on the detection of the emitted light. Lenses, a view-port and a sensitive CCD camera were added to the system to record the optical signals from the interaction chamber. The first very promising results are reported here. The same system with an additional optical spectrometer or optical filter system may be used in die future to detect impurities in the jet, such as oxygen molecules, which affect the accuracy of the polarization measurements. C1 Brookhaven Natl Lab, Upton, NY 11901 USA. RP Luciano, N (reprint author), Brookhaven Natl Lab, Upton, NY 11901 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3158 EP 3160 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202310 ER PT B AU Zhang, SY Alessi, J Bai, M Blaskiewicz, M Cameron, P Drees, A Fischer, W Gullotta, J He, P Hseuh, HC Huang, H Iriso, U Lee, R Litvinenko, V MacKay, WW Nicoletti, A Oerter, B Peggs, S Pilat, F Ptitsyn, V Roser, T Satogata, T Smart, L Snydstrup, L Thieberger, P Trbojevic, D Wang, L Wei, J Zeno, K AF Zhang, SY Alessi, J Bai, M Blaskiewicz, M Cameron, P Drees, A Fischer, W Gullotta, J He, P Hseuh, HC Huang, H Iriso, U Lee, R Litvinenko, V MacKay, WW Nicoletti, A Oerter, B Peggs, S Pilat, F Ptitsyn, V Roser, T Satogata, T Smart, L Snydstrup, L Thieberger, P Trbojevic, D Wang, L Wei, J Zeno, K GP IEEE TI Beam induced pressure rise in RHIC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Beam induced pressure rise in RHIC warm sections is one of the machine luminosity limits. The RHIC electron cloud and the beam transition pressure rise are discussed. Countermeasures and studies for RHIC pressure rise and RHIC upgrade are reported. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Zhang, SY (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3161 EP 3163 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202311 ER PT B AU Pardo, RC Savard, G Moore, EF Hecht, AA Baker, S AF Pardo, RC Savard, G Moore, EF Hecht, AA Baker, S GP IEEE TI Radioactive beams from (252)Cf fission using a gas catcher and an ECR charge breeder at ATLAS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB An upgrade to the radioactive beam capability of the ATLAS facility has been proposed using (252)Cf fission fragments thermalized and collected into a low-energy particle beam using a helium gas catcher. In order to reaccelerate these beams an existing ATLAS ECR ion source will be reconfigured as a charge breeder source. A 1Ci(252)Cf source is expected to provide sufficient yield to deliver beams Of Up to similar to 10(6) far from stability ions per second on target. A facility description and the expected performance will be presented in this paper. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Pardo, RC (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 10 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3188 EP 3190 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202320 ER PT B AU Raparia, D Lee, YY Wei, J AF Raparia, D Lee, YY Wei, J GP IEEE TI Energy correction for high power proton/H minus linac injectors SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB High-energy proton / H minus energy (> GeV) linac injector suffers from energy jitter due to R-F amplitude and phase stability. Especially in high power injectors this energy jitter results in beam losses more than I W/m that require for hand on maintenance. Depending upon the requirements for the next accelerator in the chain, this energy jitter may or may not require to be corrected. This paper will discuss the sources of this energy jitter, correction schemes with specific examples. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Raparia, D (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM raparia@bnl.gov NR 5 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3191 EP 3193 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202321 ER PT B AU Qiang, J Leitner, D Todd, D AF Qiang, J Leitner, D Todd, D GP IEEE TI A parallel 3D model for the multi-species low energy beam transport system of the RIA prototype ECR ion source VENUS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The driver linac of the proposed Rare Isotope Accelerator (RIA) requires a great variety of high intensity, high charge state ion beams. In order to design and to optimize the low energy beam line optics of the RIA front end, we have developed a new parallel three-dimensional model to simulate the low energy, multi-species ion beam formation and transport from the ECR ion source extraction region to the focal plane of the analyzing magnet. A multi-section overlapped computational domain has been used to break the original transport system into a number of subsystems. Within each subsystem, macro-particle tracking is used to obtain the charge density distribution in this subdomain. The three-dimensional Poisson equation is solved within the subdomain and particle tracking is repeated until the solution converges. Two new Poisson solvers based on a combination of the spectral method and the multigrid method have been developed to solve the Poisson equation in cylindrical coordinates for the beam extraction region and in the Frenet-Serret coordinates for the bending magnet region. Some test examples and initial applications will also be presented. C1 LBNL, Berkeley, CA 94547 USA. RP Qiang, J (reprint author), LBNL, Berkeley, CA 94547 USA. EM jqiang@lbl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3194 EP 3196 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202322 ER PT B AU Westenskow, GA Grote, DP Halaxa, E Kwan, JW Bieniosek, F AF Westenskow, GA Grote, DP Halaxa, E Kwan, JW Bieniosek, F GP IEEE TI A compact high-brightness heavy-ion injector SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB To provide a compact high-brightness heavy-ion beam source for Heavy Ion Fusion (HIF) accelerators, we have been experimenting with merging multi-beamlets in an injector which uses an RF plasma source. In an 80-kV 20-microsecond experiment, the RF plasma source has produced up to 5 mA of Ar(+) in a single beamlet. An extraction current density of 100 mA/cm(2) was achieved, and the thermal temperature of the ions was below 1 eV. We have tested at full voltage gradient the first 4 gaps of an injector design. Einzel lens were used to focus the beamlets while reducing the beamlet to beamlet space charge interaction. We were able to reach greater than 100 kV/cm in the first four gaps. We also performed experiments on a converging 119 multi-beamlet source. Although the source has the same optics as a full 1.6 NW injector system, these test were carried out at 400 kV due to the test stand HV limit. We have measured the beam's emittance after the beamlets are merged and passed through an electrostatic quadrupole (ESQ). Our goal is to confirm the emittance growth and to demonstrate the technical feasibility of building a driver-scale HIF injector. C1 Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Westenskow, GA (reprint author), Lawrence Livermore Natl Lab, POB 5508, Livermore, CA 94551 USA. EM westenskow1@llnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3197 EP 3199 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202323 ER PT B AU Kawai, Y Alton, GD Liu, Y AF Kawai, Y Alton, GD Liu, Y GP IEEE TI The effusive-flow properties of target/vapor-transport systems for radioactive ion beam applications SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID FACILITY AB We have developed a fast valve system (closing time similar to 100 mu s) that can be used to accurately measure the effusion times of various species through arbitrary geometry and size vapor transport systems with and without target material in the reservoir. The effusive-flow times are characteristic of the system and thus serve as figures of merit for assessing the quality of a given vapor-transport system as well as for assessing the permeability properties of a given target design. This article presents effusive-flow data measured with the fast valve system for noble gases flowing through a target reservoir and ion source system routinely used to generate radioactive species at the HRIBF. We determine added delay times associated with compressed reticulated-vitreous-carbon-foam (RVCF) disks, which are used for target coating matrices. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Kawai, Y (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. EM kawaiy@ornl.gov NR 5 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3206 EP 3208 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202326 ER PT B AU Kawai, Y Alton, GD Kiggans, JO Stracener, DW AF Kawai, Y Alton, GD Kiggans, JO Stracener, DW GP IEEE TI ISOL targets prepared with a new paint infiltration coating method SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A new paint infiltration coating method has been developed for fabricating ISOL targets for radioactive ion beam applications. The technique has been shown to be inexpensive, fast, and almost universal for the uniform deposition of many refractory target materials onto the interior surfaces of complex geometry matrices, such as reticulated-vitreous-carbon-foam (RVCF). The process yields robust, highly permeable targets with fast diffusion and release properties. The use of compressed RVCF, coated with an optimum thickness of target material, reduces target lengths to practical values, while preserving high permeability. We have demonstrated the viability of the technique for coating RVCF compressed by factors of 6 and 10 with WSi(2), to form targets for use at facilities such as the Rare Isotope Accelerator (RIA). C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Kawai, Y (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. EM kawaiy@ornl.gov RI kiggans, james/E-1588-2017 OI kiggans, james/0000-0001-5056-665X 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3209 EP 3211 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202327 ER PT B AU Kawai, Y Alton, GD Liu, Y AF Kawai, Y Alton, GD Liu, Y GP IEEE TI New broadband microwave frequency device for powering ECR ion sources SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID DESIGN AB Broadband rf injection offers a low-cost and effective method for increasing the physical sizes of ECR zones within ECR ion sources. Broadband radiation can also be used to ameliorate diamagnetic frequency detune effects that are believed to be problematical in single-frequency plateau ECR sources. An additive white Gaussian noise generator (AWGNG) system for injecting broadband rf power into these sources has been developed in conjunction with a commercial firm. The noise generator, in combination with an external local oscillator and a traveling wave tube amplifier (TWTA), can be used to generate broadband microwave power for ECR ion sources without requirements of modifying the injection system of these sources. The AWGNG and its initial use for powering the all permanent magnet, ORNL plateau ECR ion source will be described in this document. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Kawai, Y (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. EM kawaiy@ornl.gov NR 12 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3212 EP 3214 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202328 ER PT B AU Liu, Y Kawai, Y Billieux, HZ AF Liu, Y Kawai, Y Billieux, HZ GP IEEE TI Characterization of a tubular hot-cavity surface ionization source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A hot-cavity surface ionization source with a cylindrical cavity having a small inner diameter, d, and a length l >> d was studied. Measured ionization efficiencies for Sr, In and Al were higher than expected from surface ionization by a factor of 20, 50. and 200. respectively. The ionizafion mechanism based oil a thermal plasma inside the hot cavity was used to ex lain the results. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Liu, Y (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. EM liuy@ornl.gov NR 7 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3215 EP 3217 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202329 ER PT B AU Liu, Y Baktash, C Beene, JR Bilheux, HZ Havener, CC Krause, HF Schultz, DR Stracener, DW Vane, CR AF Liu, Y Baktash, C Beene, JR Bilheux, HZ Havener, CC Krause, HF Schultz, DR Stracener, DW Vane, CR GP IEEE TI Laser ion source development for ISOL systems at RIA SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A hot-cavity laser ion source based on solid-state tunable Ti:Sapphire lasers was tested. Three-photon resonant ionization schemes tested for Sn, Ge, and Ni yielded overall ionization efficiencies for the laser ion source of 22%, 3.3% and 2.7%, respectively. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Liu, Y (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. EM liuy@ornl.gov RI Bilheux, Hassina/H-4289-2012 OI Bilheux, Hassina/0000-0001-8574-2449 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3218 EP 3220 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202330 ER PT B AU Zhang, Y Alton, GD Kawai, Y AF Zhang, Y Alton, GD Kawai, Y GP IEEE TI Simulation studies of diffusion-release and effusive-flow of short-lived radioactive isotopes SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Simulation studies with computer models offer cost effective methods for designing targets and vapor transport systems at Isotope Separator On-Line (ISOL)-based radioactive ion beam facilities. A finite difference code, Diffuse II, was developed at the Oak Ridge National Laboratory (ORNL) for Studying diffusion-release of short-lived ion species from the three principal target geometries; results derived by use of the code are in close agreement with analytical solutions to Fick's second equation. A Monte-Carlo code, Effusion, was developed to address issues related to the design of fast vapor transport systems. Results, derived by the use of Effusion closely agree with experimental measurements. These codes and their applications are discussed in this article. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Zhang, Y (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. EM zhangyn@ornl.gov NR 9 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3221 EP 3223 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202331 ER PT B AU Keller, R Luft, P Regis, M Wallig, J Monroy, M Ratti, A Syversrud, D Welton, R Anderson, D AF Keller, R Luft, P Regis, M Wallig, J Monroy, M Ratti, A Syversrud, D Welton, R Anderson, D GP IEEE TI First results on the path towards a microwave-assisted H(-) ion source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A novel concept for creating intense beams of negative hydrogen ion beams is presented. In this approach, an ECR ion source operating at 2.45 GHz frequency is utilized as a primary plasma generator and coupled to an SNS-type multi-cusp H(-) ion source. The secondary Source is driven by chopped dc power, thereby avoiding the use of filaments or of an internal rf antenna. The development of the new ion source is aimed at supporting the future beam-power goal of 3 MW for the Spallation Neutron Source (SNS) accelerator systems that will be pursued after the start of SNS operations, but application to other proton driver accelerators that include an accumulator ring is feasible as well. The first three phases of this development effort have been successfully completed: assembly of a test stand and verification of the performance of an rf-driven SNS ion-source prototype; extraction of electrons up to 1.5 A Current from a 2.4-5-GHz ECR ion source obtained on loan from Argonne National Laboratory; and creation of a plasma in the H(-) discharge chamber with a pulsed discharge current of 12 A. The next goal is the demonstration of actual H- ion production by this novel, hybrid ion Source. This paper describes the source principle and design in detail and reports on the current status of the development work. C1 LBNL, Berkeley, CA 94720 USA. RP Keller, R (reprint author), LBNL, Berkeley, CA 94720 USA. NR 18 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3224 EP 3226 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202332 ER PT B AU You, HJ Liu, Y Meyer, FW AF You, HJ Liu, Y Meyer, FW GP IEEE TI In-situ electron cyclotron resonance (ECR) plasma potential determination using an emissive probe SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID ION-SOURCE AB Plasma potential measurements by use of a Langmuir probe (LP) and an emissive probe (EP) were compared in the ORNL CAPRICE electron cyclotron resonance (ECR) ion source. It is shown that, for normal ECR ion source operating conditions, the large population of hot electrons may make the emissive floating point method fail, and may cause the values deduced using the LP method to be in error by more than 10%. In addition, the gas mixing effect was studied by comparison of in-situ probe measurements and measurements of the extracted ion beam charge state distribution (CSD). An explanation of the effect in terms of a change in plasma potential and hot electron temperature is proposed. C1 ORNL, Oak Ridge, TN 37831 USA. RP You, HJ (reprint author), ORNL, Oak Ridge, TN 37831 USA. EM factorial@ihanyang.ac.kr NR 9 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3235 EP 3237 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202336 ER PT B AU Todd, DS Leitner, D Qiang, J Lyneis, CM Grote, DP AF Todd, DS Leitner, D Qiang, J Lyneis, CM Grote, DP GP IEEE TI Particle-in-cell simulations of the VENUS ion beam tranpsort system SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The next-generation superconducting ECR ion source VENUS serves as the prototype injector ion source for the linac driver of the proposed Rare Isotope Accelerator (RIA). The high-intensity heavy ion beams required by the RIA driver linac present significant challenges for the design and simulation of an ECR extraction and low energy ion beam transport system. Extraction and beam formation take place in a strong (up to 3T) axial magnetic field, which leads to significantly different focusing properties for the different ion masses and charge states of the extracted beam. Typically, beam simulations must take into account the contributions of up to 30 different charge states and ion masses. Two three-dimensional, particle-in-cell codes developed for other purposes, IMPACT and WARP, have been adapted in order to model intense, multi-species DC beams. A discussion of the differences of these codes and the advantages of each in the simulation of the low energy beam transport system of an ECR ion source is given. Direct comparisons of results from these two codes as well as with experimental results from VENUS are presented. C1 LBNL, Berkeley, CA 94720 USA. RP Todd, DS (reprint author), LBNL, Berkeley, CA 94720 USA. EM dstodd@lbl.gov NR 5 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3247 EP 3249 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202340 ER PT B AU Burrill, A Ben-Zvi, I Rao, T Pate, D Segalov, Z Dowell, D AF Burrill, A Ben-Zvi, I Rao, T Pate, D Segalov, Z Dowell, D GP IEEE TI Multi-alkali photocathode development at Brookhaven National Lab for application in superconducting photoinjectors SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The development of a suitable photocathode for use in a high average current photoinjector at temperatures ranging from 273 K down to 2 K is a subject of considerable interest, and active research. The choice of photocathode material is often a trade-off made based on the quantum efficiency of the cathode material, the tolerance to adverse vacuum conditions, and the laser wavelength needed to produce photoelectrons. In this paper an overview of the BNL work to date on CsK(2)Sb photocathodes on a variety of substrates, irradiated at multiple wavelengths, and at temperatures down to 170 K will be discussed. The application of this photocathode material into a SRF photoinjector will also be discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Burrill, A (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM aburrill@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3274 EP 3276 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745202349 ER PT B AU Chang, XY Ben-Zvi, I Burrill, A Johnson, P Kewisch, J Rao, T Segalov, Z Zhao, YX AF Chang, XY Ben-Zvi, I Burrill, A Johnson, P Kewisch, J Rao, T Segalov, Z Zhao, YX GP IEEE TI Study of secondary emission enhanced photoinjector SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The secondary emission enhanced photoinjector (SEEP) is a very promising new approach to the generation of high-current, high-brightness electron beams. Primary electrons with a few thousand electronvolts of energy strike a specially prepared diamond window. The large Secondary Electron Yield (SEY) provides a multiplication of the number of electrons by about two orders of magnitude. The secondary electrons drift through the diamond under an electric field and emerge into the accelerating proper of the "gun" through a Negative Electron Affinity (NEA) surface of the diamond (Hydrogen terminated). We present the calculation of heating power sources and the temperature distribution in detail. Some properties of the secondary electron beam related to beam dynamics are also reported. The results demonstrate the feasibility of this kind of cathode. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Chang, XY (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3277 EP 3279 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203001 ER PT B AU Kewisch, J Ben-Zvi, I Chang, XY AF Kewisch, J Ben-Zvi, I Chang, XY GP IEEE TI Electron beam generation and transport for the RHIC electron cooler SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB An electron cooler, based on an Energy Recovery Linac (ERL) is under development for the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. This will be the first electron cooler operating at high energy with bunched beams. A better understanding of the cooling process and more accurate measurements of Intra Beam Scattering in RHIC have imposed increased requirements on the electron accelerator: Besides a doubling of the bunch charge to 20 nC, the strength of the cooling solenoid was increased five-fold to 5 Tesla. The magnetic field on the cathode should be increased to 500 Gauss to match the magnetiaztion required in the cooling solenoid. Thus paper reports the measures taken to minimize the electron beam emittance in the cooling section. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kewisch, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3280 EP 3282 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203002 ER PT B AU Piot, P Edwards, H Huning, M Li, J Tikhoplav, R Koeth, T AF Piot, P Edwards, H Huning, M Li, J Tikhoplav, R Koeth, T GP IEEE TI Upgrade of Fermilab/NICADD photoinjector laboratory SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Femilab/NICADD photoinjector laboratory is a 16 MeV electron accelerator dedicated to beam dynamics and advanced accelerator physics studies. FNPL will soon be capable of operating at similar to 40 MeV, after the installation of a high gradient TESLA cavity. In this paper we present the foreseen design for the upgraded facility along with its performance. We discuss the possibilities of using of FNPL as an injector for the superconducting module and test facility (SM&TF). C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Piot, P (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3283 EP 3285 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203003 ER PT B AU Kurennoy, SS Nguyen, DC Schrage, DL Wood, RL Schultheiss, T Christina, V Rathke, J Young, LM AF Kurennoy, SS Nguyen, DC Schrage, DL Wood, RL Schultheiss, T Christina, V Rathke, J Young, LM GP IEEE TI Normal-conducting high current RF photoinjector for high power CWFEL SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB An RF photoinjector capable of producing high average current with low emittance and energy, spread is a key, enabling technology, for high power CW FEL. The design of a 2.5-cell. -mode, 700-MHz normal-conducting RF photoinjector cavity, with magnetic emittance compensation is completed. With average gradients of 7, 7, and 5 MV/m in its three accelerating cells, the photoinjector will produce a 2.5-MeV electron beam with 3-nC charge per bunch and transverse nets emittance below 7 mm-mrad. Electromagnetic modeling has been used extensively, to optimize ridge-loaded tapered waveguides and RF couplers, and led to a new, improved coupler iris design. The results, combined with a thermal and stress analysis, show that the challenging problem of cavity cooling can be successfully solved. Fabrication of a demo 100-mA (at 35 MHz bunch repetition rate) photoinjector is underway. The design is scalable to higher average currents by increasing the electron bunch repetition rate, and provides a path to a MW-class FEL. This paper presents the cavity, design and details of RF coupler modeling. C1 LANL, Los Alamos, NM 87544 USA. RP Kurennoy, SS (reprint author), LANL, Los Alamos, NM 87544 USA. 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3286 EP 3288 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203004 ER PT B AU Bharadwaj, V Batygin, Y Pitthan, R Sheppard, J Vincke, H Wang, JW Gronberg, J Stein, W AF Bharadwaj, V Batygin, Y Pitthan, R Sheppard, J Vincke, H Wang, JW Gronberg, J Stein, W GP IEEE TI Design issues for the ILC positron source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A positron source for the International Linear Collider (ILC) can be designed using either a multi-GeV electron beam or a multi-MeV photon beam impinging on a metal target. The major design issues are: choice of drive beam and its generation, choice of target material, the target station, positron capture section, target vault and beam transport to the ILC positron damping ring complex. This paper lists the ILC positron source requirements and their implications for the design of the positron source. A conceptual design for the ILC is expected to be finished in the next two years. With emphasis on this timescale, source design issues and possible solutions are discussed. C1 SLAC, Stanford, CA USA. RP Bharadwaj, V (reprint author), SLAC, Stanford, CA 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3309 EP 3311 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203012 ER PT B AU Xiao, L Boyce, RF Dowell, DH Li, Z Limborg-Deprey, C Schmerge, JF AF Xiao, L Boyce, RF Dowell, DH Li, Z Limborg-Deprey, C Schmerge, JF GP IEEE TI Dual feed RF gun design for the LCLS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In order to remove the dipole field introduced by the coupler in existing S-band BNL/SLAC/UCLA 1.6 cell RF gun, a dual feed design for the LCLS RF gun is proposed together with several significant changes. The improvements include adopting z-coupling instead of theta-coupling, modifying the iris dimensions and profile to increase 0- and pi-mode separation from 3.4 to 15MHz and reduce the surface field on the iris, incorporating racetrack cavity shape to minimize the quadrupole field, increasing cooling for operation at 120Hz and other small changes to improve performance and diagnostic capabilities. The 3D gun structure had been modelled with the parallel finite element complex eigensolver Omega3p to provide the desired RF parameters and to generate the gun cavity dimensions needed for fabrication. In this paper the RF gun design will be presented. C1 SLAC, Menlo Pk, CA 94025 USA. RP Xiao, L (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM liling@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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3321 EP 3323 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203016 ER PT B AU Beard, K Bogacz, SA Derbenev, Y Yonehara, K Johnson, RP Paul, K Roberts, TJ AF Beard, K Bogacz, SA Derbenev, Y Yonehara, K Johnson, RP Paul, K Roberts, TJ GP IEEE TI Simulations of parametric resonance ionization cooling of muon beams SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Parametric-resonance ionization cooling (PIC) is being developed to create small beams so that high muon collider luminosity can be achieved with fewer muons. In the linear channel that is studied in this effort, a half integer resonance is induced such that the normal elliptical motion of particles in x - x' phase space becomes hyperbolic, with particles moving to smaller x and larger x' as they pass down the channel. Thin absorbers placed at the focal points of the channel then cool the angular divergence of the beam by the usual ionization cooling mechanism where each absorber is followed by RF cavities. Thus the phase space of the beam is compressed in transverse position by the dynamics of the resonance and its angular divergence is compressed by the ionization cooling mechanism. We report the first results of simulations of this process, a study of the compensation of chromatic aberration by using synchrotron oscillations. C1 Jefferson Lab, Newport News, VA USA. RP Beard, K (reprint author), Jefferson Lab, Newport News, VA USA. EM Beard@JLab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3375 EP 3377 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203034 ER PT B AU Derbenev, Y Johnson, RP AF Derbenev, Y Johnson, RP GP IEEE TI Ionization cooling using a parametric resonance SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Muon collider luminosity depends on the number of muons in the storage ring and on the transverse size of the beams in collision. Ionization cooling as it is presently envisioned will not cool the beam sizes sufficiently well to provide adequate luminosity without large muon intensities. A new idea to combine ionization cooling with parametric resonances has been developed that will lead to beams with much smaller sizes so that high luminosity in a muon collider can be achieved with fewer muons. In the linear channel described here, a half integer resonance is induced such that the normal elliptical motion of particles in x-x' phase space becomes hyperbolic, with particles moving to smaller x and larger x' as they pass down the channel. Thin absorbers placed at the focal points of the channel then cool the angular divergence of the beam by the usual ionization cooling mechanism where each absorber is followed by RF cavities. We discuss the elementary theory of Parametric-resonance Ionization Cooling (PIC), including the need to start with a beam that has already been cooled adequately. C1 Jefferson Lab, Newport News, VA USA. RP Derbenev, Y (reprint author), Jefferson Lab, Newport News, VA USA. EM rol@muonsinc.com 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3378 EP 3380 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203035 ER PT B AU Derbenev, Y Bogacz, A Delayen, J Grames, J Hutton, A Krafft, G Li, R Merminga, L Poelker, M Yunn, B Zhang, Y Montag, C AF Derbenev, Y Bogacz, A Delayen, J Grames, J Hutton, A Krafft, G Li, R Merminga, L Poelker, M Yunn, B Zhang, Y Montag, C GP IEEE TI ELIC at CEBAF SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We report on the progress of the conceptual development of the energy recovering linac (ERL)-based electron-light ion collider (ELIC) at CEBAF that is envisioned to reach luminosity level of 10(33)-10(35) /cm(2)s with both beams polarized to perform a new class of experiments in fundamental nuclear physics. Four interaction points with all light ion species longitudinally or transversally polarized and fast flipping of the spin for all beams are planned. The unusually high luminosity concept is based on the use of the electron cooling and crab crossing colliding beams. Our recent studies focused on the design of low beta interaction points, exploration on raising the polarized electron injector current to the level of 3-30 mA with the use of electron circulator-collider ring, forming a concept of stacking and cooling of the ion beams, and specifications of the electron cooling facility. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Derbenev, Y (reprint author), Jefferson Lab, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3381 EP 3383 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203036 ER PT B AU Benesch, J Bogacz, A Chao, Y Freyberger, A Grames, J Harwood, L Kazimi, R Krafft, GA Merminga, L Spata, M Tiefenback, M Wiseman, M Yunn, B Zhang, Y AF Benesch, J Bogacz, A Chao, Y Freyberger, A Grames, J Harwood, L Kazimi, R Krafft, GA Merminga, L Spata, M Tiefenback, M Wiseman, M Yunn, B Zhang, Y GP IEEE TI Beam physics for the 12 GeVCEBAF Upgrade project SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Beam physics aspects of the 12 GeV Upgrade of CEBAF are presented. The CEBAF Upgrade to 12 GeV is achieved via 5.5 recirculations through the linacs, and the installation of 10 new high-gradient cryomodules. A new experimental hall, Hall D, is envisioned at the end of the North Linac. Simulation results for a straight-ahead and a recirculated injector are summarized and compared. Beam transport designs are discussed and evaluated with respect to matching and beam breakup (BBU) optimization. Effects of synchrotron radiation excitation on the beam properties are calculated. BBU simulations and derived specifications for the damping of higher order modes of the new 7-cell cavities are presented. The energies that provide longitudinal polarization in multiple experimental halls simultaneously are calculated. Finally, detailed optics of the Hall D transport line has been obtained. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Benesch, J (reprint author), Jefferson Lab, Newport News, VA 23606 USA. EM merminga@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3384 EP 3386 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203037 ER PT B AU Fisher, AS Novokhatski, A Turner, JL Wienands, U Yocky, G Holtzapple, R AF Fisher, AS Novokhatski, A Turner, JL Wienands, U Yocky, G Holtzapple, R GP IEEE TI Bunch-length measurements in PEP-II SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We measured the lengths of colliding e+e- bunches in the PEP-II B Factory at SLAG using various techniques. First, at several RF voltages and with both single-bunch and multibunch beams, a synchroscan streak camera measured synchrotron emission through a narrow blue filter. With 3.8 MV of RF, the length of a single positron bunch was 12 mm at low current, rising to 13 mm at 1.5 mA and 14.8 mm at 3 mA. The electrons measured 12.2 mm at 16 MV with little current dependence. Both are longer than the expected low-current value of 10 mm (e+) and 10.5 mm (e-), derived from the energy spread and the measured synchrotron tune. We also determined the length for multibunch fills from measurements between 2 and 13 GHz of the bunch spectrum on a BPM button. After correcting for the frequency dependence of cable attenuation, we fitted the measured spectrum to that of a Gaussian bunch. At 3.8 MV, the positron measurement gave 13.2 mm at 1.5 mA/bunch in a full ring, shorter than the 15.6 mm found with the streak camera under these conditions, but we found 11.4 mm for the electrons at 16.7 MV and 1 mA/bunch, in good agreement with the 11 mm from multibunch streak measurements. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94305 USA. RP Fisher, AS (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94305 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3408 EP 3410 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203045 ER PT B AU Holtzapple, R Dujmic, D Fisher, AS AF Holtzapple, R Dujmic, D Fisher, AS GP IEEE TI Single-bunch tune and beam size measurements along bunch trains in PEP-II SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB By scanning gated cameras and gated tune monitors across the bunch pattern during normal colliding-bunch operation of PEP-II, the tunes and beam sizes of individual bunches were measured simultaneously in the high and low energy storage rings of PEP-II. The measurements were made with 1561 colliding bunches in PEP-II, arranged in trains of 66 bunches, with each bunch in the train separated by 4.2 ns. The tune and beam size measurements were correlated with the current, luminosity, and specific luminosity of the bunch. The results show a vertical tune shift at the start and end of the mini-trains, a luminosity droop along the mini-train, and specific luminosity drop in the first and last bunches of the train, since they experience a different parasitic crossing on either side of the interaction point (IP). C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94305 USA. RP Holtzapple, R (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94305 USA. EM Holtzapple@Alfred.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3411 EP 3413 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203046 ER PT B AU Ng, CK Folwell, N Ge, L Langton, J Lee, LQ Novokhatski, A AF Ng, CK Folwell, N Ge, L Langton, J Lee, LQ Novokhatski, A GP IEEE TI Simulation of HOM leakage in the PEP-II bellows SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB An important factor that limits the PEP-II from operating at high currents is higher-order-mode (HOM) heating of the bellows. One source of HOM heating is the formation of trapped modes at the bellows as a result of geometry variation in the vacuum chamber, for example, the masking near the central vertex chamber. Another source comes from HOMs generated upstream that leak through the gaps between the bellows fingers. Modeling the fine details of the bellows and the surrounding geometry requires the resolution and accuracy only possible with a large number of mesh points on an unstructured grid. We use the parallel finite element eigensolver Omega3P for trapped mode calculations and the S-matrix solver S3P for transmission analysis. The damping of the HOMs by the use of absorbers inside the bellows will be investigated. C1 SLAC, Menlo Pk, CA 94025 USA. RP Ng, CK (reprint author), SLAC, Menlo Pk, CA 94025 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3414 EP 3416 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203047 ER PT B AU Sullivan, M Donald, M Ecklund, S Novokhatski, A Seeman, J Wienands, U Biagini, M AF Sullivan, M Donald, M Ecklund, S Novokhatski, A Seeman, J Wienands, U Biagini, M GP IEEE TI A preliminary interaction region design for a super B-Factory SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The success of the two B-Factories (PEP-II and KEKB) has encouraged us to look at design parameters for a B-Factory with a 30-50 times increase in the luminosity of the present machines to a luminosity of L similar to 1 x 10(36) cm(-2) sec(-1). We present an initial design of an interaction region for a "SuperB" accelerator with a crossing angle of +/- 14 mrad and include a discussion of the constraints, requirements and concerns that go into designing an interaction region for these very high luminosity e(+)e(-) machines. C1 SLAC, Menlo Pk, CA USA. RP Sullivan, M (reprint author), SLAC, Menlo Pk, CA USA. EM sullivan@slac.Stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3417 EP 3419 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203048 ER PT B AU Weathersby, S Langton, J Novokhatski, A Seeman, J AF Weathersby, S Langton, J Novokhatski, A Seeman, J GP IEEE TI Damping higher order modes in the PEP-II B-factory vertex bellows SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Higher stored currents and shorter bunch lengths are requirements for increasing luminosity in colliding storage rings. As a result, more HOM power is generated in the IP region. This HOM power propagates to sensitive components causing undesirable heating, thus becoming a limiting issue for the PEP-II B-factory. HOM field penetration through RF shielding fingers has been shown to cause heating in bellows structures. To overcome these limitations, a proposal to incorporate ceramic absorbers within the bellows cavity to damp these modes is presented. Results show that the majority of modes of interest are damped, the effectiveness depending on geometrical considerations. An optimal configuration is presented for the PEP-II B-factory IR bellows component utilizing commercial grade ceramics with consideration for heat transfer requirements. C1 Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Weathersby, S (reprint author), Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3420 EP 3422 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203049 ER PT B AU Weathersby, S Kosovsky, M Kurita, N Novokhatski, A Seeman, J AF Weathersby, S Kosovsky, M Kurita, N Novokhatski, A Seeman, J GP IEEE TI A proposal for a new HOM absorber in a straight section of the PEP-II low energy ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Attainment of high luminosity in storage ring colliders necessitates increasing stored currents and reducing bunch lengths. Consequently, intense beam fields will scatter more power into higher order modes from begun line sources such as collimators, masks and tapers. This power penetrates into sensitive components such as a bellows, causing undesirable heating and limits machine performance. To overcome this limitation we propose incorporating ceramic absorbers in the vicinity of the bellows to damp beam induced modes while preserving a matched impedance to the beam. This is accomplished with an absorber configuration which damps TE dipole and quadrupole traveling waves while preserving TM monopole propagation. A scattering parameter analysis is presented utilizing properties of commercial grade ceramics and indicates a feasible solution. C1 Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Weathersby, S (reprint author), Stanford Linear Accelerator Ctr, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3423 EP 3425 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203050 ER PT B AU Emma, P Bentson, L Erickson, R Fieguth, T Seeman, J Seryi, A AF Emma, P Bentson, L Erickson, R Fieguth, T Seeman, J Seryi, A GP IEEE TI Proposal for a multi-use test beam in the SLAC B-Line SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB With the impending construction of the Linac Coherent Light Source (LCLS) [1] at SLAC, displacing the well-used Final Focus Test Beam (FFTB) area, there is growing interest in developing a new test beam facility which makes use of the remaining 2/3 of the SLAC linac, and is available during LCLS operations. The success of the Sub-Picosecond Pulse Source (SPPS) [2] and the desire to preserve this capacity suggest a new beamline with similar or improved electron beam quality, including bunch length compression to 10 mu m. Beam availability during LCLS operations requires a new 1-km bypass beamline connecting the 2/3-point of the linac with, for example, the existing B-Line tunnel at the end of the linac. A second operating mode, with LCLS not running, is then available using the existing connection directly from the end of the linac to the B-line. This path would provide the highest beam quality at 30 GeV and also allow a third operational mode by deflecting a few of the very high-brightness 120-Hz, 14-GeV LCLS bunches at low rate (1-10 Hz) into the B-line. Additionally, linear collider research might also be carried out in a short final focus system at the end of the B-Line, capable of producing a 70-nm rms transverse beam size. We describe a design for these systems. C1 SLAC, Menlo Pk, CA 94025 USA. RP Emma, P (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM Emma@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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3426 EP 3428 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203051 ER PT B AU Ross, M Frisch, J Hacker, KE Jones, RM McCormick, D O'Connell, C Smith, T Napoly, O Paparella, R Baboi, N Wendt, M AF Ross, M Frisch, J Hacker, KE Jones, RM McCormick, D O'Connell, C Smith, T Napoly, O Paparella, R Baboi, N Wendt, M GP IEEE TI Cavity alignment using beam induced higher order modes signals in the TTF linac SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Each nine cell superconducting (SC) accelerator cavity in the TESLA Test Facility (TTF) at DESY [1] has two higher order mode (HOM) couplers that efficiently remove the HOM power [2]. They can also provide useful diagnostic signals. The most interesting modes are in the first 2 cavity dipole passbands. They are easy to identify and their amplitude depends linearly on the beam offset from the cavity axis making them excellent beam position monitors (BPM). By steering the beam through an eight-cavity cryomodule, we can use the HOM signals to estimate internal residual alignment errors and minimize wakefeld related beam emittance growth. We built and tested a time-domain based waveform recorder system that captures information from each mode in these two bands on each beam pulse. In this paper we present a preliminary experimental study of the single-bunch generated HOM signals at the TTF linac including estimates of cavity alignment precision and HOM BPM resolution. C1 SLAC, Menlo Pk, CA 94025 USA. RP Ross, M (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM mcrec@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3429 EP 3431 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203052 ER PT B AU Seeman, J Cai, Y Ecklund, S Fox, J Heifets, S Li, N McIntosh, P Novokhatski, A Sullivan, M Teytelman, D Wienands, U AF Seeman, J Cai, Y Ecklund, S Fox, J Heifets, S Li, N McIntosh, P Novokhatski, A Sullivan, M Teytelman, D Wienands, U GP IEEE TI Parameters of a super-B-Factory design SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Parameters are being studied for a high luminosity e(+)e(-) collider operating at the Upsilon 4S that would deliver a luminosity in the range of 7 to 10 x 10(35)/cm(2)/s. Particle physics studies dictate that a much higher luminosity collider than the present B-Factory accelerators will be needed to answer future new key physics questions. The success of the present B-Factories, PEP-II and KEKB, in producing unprecedented luminosity with very short commissioning times has taught us about the accelerator physics of asymmetric e(+)e(-) colliders in a new parameter regime. Such a collider could produce an integrated luminosity of 10,000 fb(-1) (10 ab(-1)) in a running year. A Super-B-Factory [1-8] with 30 to 50 times the performance of the present PEP-II accelerator would incorporate a higher frequency RF system, lower impedance vacuum chambers, higher power synchrotron radiation absorbers, and stronger bunch-by-bunch feedback systems. The present injector based on the SLAC linac needs no improvements and is ready for the Super-B-Factory. C1 SLAC, Menlo Pk, CA 94025 USA. RP Seeman, J (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM seeman@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3432 EP 3434 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203053 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 Kulikov, A Li, N Novokhatski, A Ross, M Schuh, P Smith, T Sonnad, K Stanek, M Sullivan, M Tenenbaum, P Teytelman, D Turner, J Weaver, M Van Winkle, D Wienands, U Woodley, M Yan, Y Yocky, G Kozanecki, W Wormser, G Biagini, M Steier, C Wolski, A 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 Kulikov, A Li, N Novokhatski, A Ross, M Schuh, P Smith, T Sonnad, K Stanek, M Sullivan, M Tenenbaum, P Teytelman, D Turner, J Weaver, M Van Winkle, D Wienands, U Woodley, M Yan, Y Yocky, G Kozanecki, W Wormser, G Biagini, M Steier, C Wolski, A GP IEEE TI Performance of the PEP-II B-Factory Collider at SLAC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB PEP-II is an e(+)e(-) asymmetric B-Factory Collider located at SLAG operating at the Upsilon 4S resonance (3.1 GeV x 9 GeV). It has reached a luminosity of 9.21x10(33)/cm(2)/s and has delivered an integrated luminosity of 710 pb(-1) in one day. PEP-II has delivered, over the past six years, an integrated luminosity to the BaBar detector of over 262 fb(-1). PEP-II operates in continuous injection mode for both beams boosting the integrated luminosity. The peak positron current has reached 2.45 A in 1588 bunches. Steady progress is being made in reaching higher luminosity. The goal over the next several years is to reach a luminosity of 2.1x10(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 beta(y)* interaction region operation, and coupling control. Figure 1 shows the PEP-II tunnel. C1 SLAC, Menlo Pk, CA 94025 USA. RP Seeman, J (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM seeman@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3435 EP 3437 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203054 ER PT B AU Fernow, RC Gallardo, JC AF Fernow, RC Gallardo, JC GP IEEE TI Front-end design studies for a muon collider SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Using muons instead of electrons is a promising approach for a lepton-lepton collider with energies beyond that available at the proposed International Linear Collider. At this time a self-consistent design of a high-luminosity muon collider has not been completed. However, a lot of progress has been made in simulating cooling and parts of other systems that could play a role in an eventual collider design. In this paper we look at front-end system designs that begin with a single pion bunch produced from a high power mercury target. We present ICOOL simulation results for phase rotation and charge separation of the muon beams. A bent solenoid is used for high-efficiency separation of the positive and negative muon beams. The subsequent transport system produces two parallel beams, 5 m apart in the horizontal plane. The system produces 0.27 mu(+) / p and 0.28 mu(-) / p in a conveniently-chosen longitudinal phase space box. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fernow, RC (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM fernow@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3441 EP 3443 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203056 ER PT B AU Fernow, RC AF Fernow, RC GP IEEE TI Recent developments on the muon-facility design-code ICOOL SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Current ideas for designing neutrino factories and muon colliders require unique configurations of fields and materials to prepare the muon beam for acceleration [1,2]. We have continued the development of the 3-D tracking code ICOOL for examining possible system configurations [3]. Development of the ICOOL code began in 1996 in order to simulate the process of ionization cooling. This required tracking in magnetic focusing lattices, together with interactions in shaped materials that must be placed in the beam path. Eventually the early linear cooling channels evolved into cooling rings. In addition the facilities require many other novel beam manipulations besides ionization cooling, such as pion collection in a high field solenoid, rf phase rotation, and acceleration in FFAG rings. We describe some of the new features that have been incorporated in ICOOL for handling these requirements. A suite of auxiliary codes have also been developed for pre-processing, post-processing, and optimization. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fernow, RC (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM fernow@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3444 EP 3446 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203057 ER PT B AU Beebe-Wang, J Montag, C Deshpande, A Rondeau, D Surrow, B AF Beebe-Wang, J Montag, C Deshpande, A Rondeau, D Surrow, B GP IEEE TI Synchrotron radiation in eRHIC interaction region SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The electron-ion collider eRHIC [1] currently under study at BNL consists of a 10GeV high intensity electron beam facility to be added to the existing RHIC complex. The interaction region of this facility has to provide the required low-beta focusing while accommodating the synchrotron radiation generated by beam separation close to the interaction point. In the current design, the synchrotron radiation caused by 10GeV electrons bent by separator dipole magnets will be guided through the interaction region and dumped 5m downstream. However, it is unavoidable to stop a fraction of the photons at the septum where the electron and ion vacuum systems are separated. In order to protect the septum and minimize the backward synchrotron radiation, an absorber and collimation system will be employed. In this paper, we first present the overview of the current design of the eRHIC interaction region with special emphasis on the synchrotron radiation. Then the initial design of the absorber, including its geometrical and physical property, will be described. Finally, our initial investigation of synchrotron radiation in the eRHIC interaction region, especially a simulation of the backward scattering from the absorber, will be presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Beebe-Wang, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM bbwang@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3447 EP 3449 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203058 ER PT B AU Litvinenko, VN Ben-Zvi, I Ahrens, L Bai, M Beebe-Wang, J Blaskiewicz, M Brennan, JM Calaga, R Chang, X Fedotov, AV Fischer, W Kayran, D Kewisch, J MacKay, WW Montag, C Parker, B Peggs, S Ptitsyn, V Roser, T Ruggiero, A Satogata, T Surrow, B Tepikian, S Trbojevic, D Yakimenko, V Zhang, SY Farkhondeh, M Deshpande, A AF Litvinenko, VN Ben-Zvi, I Ahrens, L Bai, M Beebe-Wang, J Blaskiewicz, M Brennan, JM Calaga, R Chang, X Fedotov, AV Fischer, W Kayran, D Kewisch, J MacKay, WW Montag, C Parker, B Peggs, S Ptitsyn, V Roser, T Ruggiero, A Satogata, T Surrow, B Tepikian, S Trbojevic, D Yakimenko, V Zhang, SY Farkhondeh, M Deshpande, A GP IEEE TI ERL based electron-ion collider eRHIC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In this paper we describe eRHIC design based on the RHIC hadron rings and 10-to20 GeV energy recovery electron linac. RHIC requires a very large tunability range for c.m. energies while maintaining very high luminosity up to 10(34) cm(-2) s(-1) per nucleon. The designs of this future polarized electron-hadron collider, eRHIC, based on a high current super-conducting energy-recovery linac (ERL) with energy of electrons up to 20 GeV, have a number of specific requirements on the ERL optics. Two of the most attractive features of this scheme are full spin transparency of the ERL at all operational energies and the capability to support up to four interaction points. We present two main layout of the eRHIC, the expected beam and luminosity parameter, and discuss the potential limitation of its performance. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Litvinenko, VN (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM vl@bnl.gov RI Kayran, Dmitry/E-1876-2013 OI Kayran, Dmitry/0000-0002-1156-4384 NR 10 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3450 EP 3452 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203059 ER PT B AU Montag, C Bogacz, A Derbenev, Y Merminga, L AF Montag, C Bogacz, A Derbenev, Y Merminga, L GP IEEE TI Interaction region design for the electron-light ion collider ELIC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Electron-Light Ion Collider ELIC proposed by Jefferson Lab aims at a luminosity in the 10(35) cm(-2)sec(-1) range for collisions of 150 GeV protons on 7 GeV electrons [1, 2]. To achieve these high luminosities, very strong low-beta focusing of low-emittance beams is required. Taking advantage of the unequal design proton beam emittances in the two transverse planes, an interaction region design based on superconducting quadrupole doublets has been developed. Compared with the original design in [2], this scheme provides larger beam apertures at lower magnetic fields, while potentially doubling the luminosity. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Montag, C (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3453 EP 3455 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203060 ER PT B AU Montag, C Parker, B Tepikian, S Wang, D AF Montag, C Parker, B Tepikian, S Wang, D GP IEEE TI Interaction region design for the electron-ion collider eRHIC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB To facilitate the study of collisions between 10 GeV polarized electrons and 100 GeV/u heavy ions or 250 GeV polarized protons at luminosities in the 10(33) cm(-2)sec(-1) range (e-p case), adding a 10 GeV electron storage ring to the existing RHIC complex has been proposed. The interaction region of this electron-ion collider eRHIC has to provide the required low-beta focussing, while simultaneously accomodating the synchrotron radiation fan generated by beam separation close to the interaction point, which is particularly challenging. The latest design status of the eRHIC interaction region will be presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Montag, C (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 7 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3456 EP 3458 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203061 ER PT B AU Gallardo, JC Berg, JS Fernow, RC Kirk, H Palmer, RB Neuffer, D Paul, K AF Gallardo, JC Berg, JS Fernow, RC Kirk, H Palmer, RB Neuffer, D Paul, K GP IEEE TI New and efficient neutrino factory front-end design SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The front-end of a neutrino factory (the part of the facility between the target and the first linear accelerator) represented a large fraction, about 40 %, of the total facility costs as discussed in a rather comprehensive feasibility study (FS2) [1]. Several recent developments, briefly summarize in this article, lead to the idea that a new design for the front end may be possible and that it is significantly less expensive than the front end used in FS2. C1 BNL, Upton, NY 11973 USA. RP Gallardo, JC (reprint author), BNL, Upton, NY 11973 USA. EM gallardo@bnl.gov RI Berg, Joseph/E-8371-2014 OI Berg, Joseph/0000-0002-5955-6973 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3459 EP 3461 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203062 ER PT B AU Kirk, HG Kahn, SA Mills, FE Cline, D Garren, AA AF Kirk, HG Kahn, SA Mills, FE Cline, D Garren, AA GP IEEE TI A compact 6D muon cooling ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We discuss a conceptual design for a compact muon cooling system based on a weak-focusing ring loaded with high-pressure hydrogen gas. We demonstrate that such a ring will be capable of cooling a circulating muon beam in each of the three spatial dimensions so that 6D cooling of the muon beam phase space can be achieved. C1 BNL, Upton, NY 11973 USA. RP Kirk, HG (reprint author), BNL, Upton, NY 11973 USA. EM hkirk@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3462 EP 3464 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203063 ER PT B AU Del Frate, L Barzi, E Turrioni, D Alsharo'a, M Johnson, RP Kuchnir, M AF Del Frate, L Barzi, E Turrioni, D Alsharo'a, M Johnson, RP Kuchnir, M GP IEEE TI Novel muon cooling channels using hydrogen refrigeration and high temperature superconductor SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Ionization cooling, a method for shrinking the size of a muon beam, requires a low Z energy absorber, high-field magnets, and high gradient RF. We have studied the use of hydrogen systems to provide ionization energy loss for ration beam cooling, breakdown suppression for pressurized high-gradient RF cavities, and refrigeration for superconducting magnets and cold RF cavities. We report progress on the designs of cryostat and refrigeration systems for different sections of muon cooling channels to achieve safe and robust means to enable exceptionally bright muon beams. We find that engineering designs can be greatly simplified if high temperature superconductor can be used that has the capability to carry adequate current in fields above 10 T for temperatures above 33 K for the use of integrated pressurized RF cavities, or for temperatures above 16 K for designs where the RF and cooling sections are sequential. C1 Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Del Frate, L (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL USA. EM rol@muonsinc.com 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3468 EP 3470 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203065 ER PT B AU Nishimura, H Robin, D Steier, C Donahue, R AF Nishimura, H Robin, D Steier, C Donahue, R GP IEEE TI Beam loss simulation studies for ALS top-off operation SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB ALS[1] has been proposing the Top-off injection[2] of the electron beam. As a part of its radiation safety study, we carried out two kinds of tracking studies: (1) to confirm that the injected beam cannot go into users' photon beam lines, and (2) to control the location of the beam dump when the storage ring RF is tripped. (1) is done by tracking electrons from a photon beam line to the injection sector inversely by including the magnetic field profiles, varying the field strength with geometric aperture limits to conclude that it is impossible. (2) is done by tracking an electron with radiation in 6-dim space for different combinations of vertical scrapers for the realistic lattice with errors. C1 LBNL, Berkeley, CA 94720 USA. RP Nishimura, H (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3532 EP 3534 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201152 ER PT B AU Norem, J Hassanein, A Insepov, Z Konkashbaev, I AF Norem, J Hassanein, A Insepov, Z Konkashbaev, I GP IEEE TI Breakdown in RF cavities SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We present a simple model of breakdown in rf cavities. For most events this involves tensile stress and tensile strength, however other effects can also contribute. We discuss the effects of different materials, fatigue, high pressure gas, primary and secondary emission sites, local field enhancements, dark currents, secondary emission, work functions, magnetic fields, macro and microscopic fracture mechanisms high current densities, surface and subsurface defects, and astronomical power densities. While primarily devoted to normal conductors, this work also has consequences for superconducting rf surfaces. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Norem, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM norem@anl.gov RI Insepov, Zinetula/L-2095-2013 OI Insepov, Zinetula/0000-0002-8079-6293 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3548 EP 3550 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203092 ER PT B AU Dey, J Kourbanis, I AF Dey, J Kourbanis, I GP IEEE TI 53 MHz beam loading compensation for slip stacking in the Fermilab Main Injector SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Recently In-Phase and Quadrature (I&Q) was added to both the 53 MHz Feedback and Feedforward Beam Loading Compensation for Slip Stacking in the Fermilab Main Injector. With 53 MHz Feedback, we can now turn the 18 Radio Frequency (RF) Stations off down to below 100 V. In using I&Q on Feedforward, beam loading compensation to the beam on both the upper and lower frequencies of Slip Stacking can be applied as we slip the beam. I&Q theory will be discussed. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Dey, J (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM dey@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3551 EP 3553 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203093 ER PT B AU Wu, V Chen, A Qian, Z Wildman, DW AF Wu, V Chen, A Qian, Z Wildman, DW GP IEEE TI Design of a new Main Injector cavity for the Fermilab Proton Driver era SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In the design report of the Fermilab Proton Driver [1], the Main Injector (MI) needs to be upgraded to a 2 MW machine. For the Main Injector radiofrequency (rf) upgrade, R&D efforts are launched to design and build a new rf system. This paper presents the new cavity design study for the rf system. The cavity is simulated with the design code Mafia [2]. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Wu, V (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM vincentw@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3554 EP 3556 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203094 ER PT B AU Rimmer, RA Manning, S Manus, R Phillips, L Stirbet, M Worland, K Wu, G Li, D MacGill, R Staples, J Virostek, S Zisman, M Taminger, K Hafley, R Martin, R Summers, D Reep, M AF Rimmer, RA Manning, S Manus, R Phillips, L Stirbet, M Worland, K Wu, G Li, D MacGill, R Staples, J Virostek, S Zisman, M Taminger, K Hafley, R Martin, R Summers, D Reep, M GP IEEE TI Fabrication of the prototype 201.25 MHz cavity for a muon ionization cooling experiment SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We describe the fabrication and assembly of the first prototype 201.25 MHz copper cavity for the moon ionization cooling experiment (MICE). This cavity was developed by the US MUCOOL collaboration and will be tested in the new MUCOOL Test Area at Fermilab. We outline the component and subassembly fabrication steps and the various metal forming and joining methods used to produce the final cavity shape. These include spinning, brazing, TIG welding, electron beam welding, electron beam annealing and deep drawing. Some of the methods developed for this cavity are novel and offer significant cost savings over conventional construction methods. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Rimmer, RA (reprint author), Lawrence Berkeley Natl Lab, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3557 EP 3559 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203095 ER PT B AU Nishimura, H Scarvie, T AF Nishimura, H Scarvie, T GP IEEE TI Estimation of the effective magnet misalignments of the ALS storage ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB New storage ring lattices have traditionally been commissioned using a trial-and-error approach, where the number of turns circulated is slowly built up until enough beam is stored to correct the orbit. We have found that by combining the calculated response matrix of magnet misalignments from a linear model of a new lattice with the measured steering magnet response matrix used during normal operations, it is possible to make an educated guess for the steering magnet settings that will immediately allow beam circulation in the new lattice. "Effective" magnet misalignments are simply those that are sufficiently close to the real misalignments to make the first guess good enough to circulate beam; the relationship between effective and real magnet misalignments is also discussed in the paper. This predictive steering method makes the process of establishing enough circulating beam for SVD-based orbit correction in a new lattice very efficient. C1 LBNL, Berkeley, CA 94720 USA. RP Nishimura, H (reprint author), LBNL, Berkeley, CA 94720 USA. EM H_Nishimura@lbl.gov; Tom_Scarvie@lbl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3559 EP 3560 PG 2 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745201153 ER PT B AU Virostek, S Li, D AF Virostek, S Li, D GP IEEE TI RF, thermal and structural analysis of the 201.25 MHz muon ionization cooling cavity SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A finite element analysis has been carried out to characterize the RF, thermal and structural behavior of the prototype 201.25 MHz cavity for a muon ionization cooling channel. A single ANSYS [1] model has been developed to perform all of the calculations in a multistep process. The high-gradient closed-cell cavity is currently being fabricated [2] for the MICE (international Muon Ionization Cooling Experiment) and MUCOOL experiments. The 1200 mm diameter cavity is constructed of 6 mm thick copper sheet and incorporates a rounded pillbox-like profile with an open beam iris terminated by 420 mm diameter, 0.38 mm thick curved beryllium foils. Tuning is accomplished through elastic deformation of the cavity, and cooling is provided by external water passages. Details of the analysis methodology will be presented including a description of the ANSYS macro that computes the heat loads from the RF solution and applies them directly to the thermal model. The process and results of a calculation to determine the resulting frequency shift due to thermal and structural distortion of the cavity will also be presented. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Virostek, S (reprint author), Lawrence Berkeley Natl 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3560 EP 3562 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203096 ER PT B AU Li, ZH Chan, J Bentson, LD Dowell, DH Limborg-Deprey, C Schmerge, JF Schultz, D Xiao, LL AF Li, ZH Chan, J Bentson, LD Dowell, DH Limborg-Deprey, C Schmerge, JF Schultz, D Xiao, LL GP IEEE TI Coupler design for the LCLS injector S-band structures SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The LCLS injector is required to provide a 1-nC, 10-ps bunch with a normalized rms transverse projected emittance of less than I micron. The LCLS beam is generated and accelerated in a 1.6-cell S-band RF gun at 120 MV/m up to 6 MeV. The gun is followed by two SLAC 3-m S-band accelerator structures to further accelerate the beam to 135 MeV which moves the beam out of the space-charge dominated regime. In the SLAC S-band structures, the RF power feed is through a single coupling-hole (single-feed coupler) which results in a field asymmetry. The time dependent multipole fields in the coupler induce a transverse kick along the bunch and cause the emittance to increase above the LCLS specification. To meet the stringent emittance requirements for the injector, the single-feed couplers will be replaced by a dual-feed racetrack design to minimize the multipole field effects. We will present detailed studies of the multipole fields in the SLAC linac RF coupler and the improvements with the dual-feed ractrack design using the parallel finite element S-parameter solver S3P. C1 SLAC, Menlo Pk, CA 94025 USA. RP Li, ZH (reprint author), SLAC, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3563 EP 3565 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203097 ER PT B AU Horan, D Cherbak, E AF Horan, D Cherbak, E GP IEEE TI High-power rf testing of a 352-MHz fast-ferrite rf cavity tuner at the advanced photon source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A 352-MHz fast-ferrite rf cavity tuner, manufactured by Advanced Ferrite Technology, was high-power tested on a single-cell copper rf cavity at the Advanced Photon Source. These tests measured the fast-ferrite tuner performance in terms of power handling capability, tuning bandwidth, tuning speed, stability, and rf losses. The test system comprises a single-cell copper rf cavity fitted with two identical coupling loops, one for input rf power and the other for coupling the fast-ferrite tuner to the cavity fields. The fast-ferrite tuner rf circuit consists of a cavity coupling loop, a 6-1/8" EIA coaxial line system with directional couplers, and an adjustable 360 mechanical phase shifter in series with the fast-ferrite tuner. A bipolar DC bias supply, controlled by a low-level rf cavity tuning loop consisting of an rf phase detector and a PID amplifier, is used to provide a variable bias current to the tuner ferrite material to maintain the test cavity at resonance. Losses in the fast-ferrite tuner are calculated from cooling water calorimetry. Test data will be presented. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Horan, D (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. EM horan@aps.anl.gov RI Dom, Rekha/B-7113-2012 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3571 EP 3573 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203100 ER PT B AU Waldschmidt, G Morrison, L Horan, D Pile, G DiMonte, N AF Waldschmidt, G Morrison, L Horan, D Pile, G DiMonte, N GP IEEE TI Higher-order-mode damper testing and installation in the advanced photon source 352-MHz single-cell rf cavities SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Higher-order-mode dampers were recently installed in the storage ring rf cavities at the Advanced Photon Source to reduce longitudinal coupled-bunch instability. It was discovered that the 535-MHz cavity monopole mode created beam instability at beam currents in excess of 85 mA causing effective horizontal emittance blowup (due to dispersion). Methods of compensating for the instability by detuning the cavities and adjusting the cavity water temperature were becoming more difficult at higher beam currents as tests were performed to prepare for eventual 300-mA beam current operation. Electric field passive dampers located on the median plane of each cavity were determined to be the most promising solution. Simulation models were created and verified with low-power testing of the dampers. High-power testing of the dampers as well as conditioning of the damper ceramic load were also performed at the APS 352-MHz rf test stand and compared with simulation results. Preliminary test results will be discussed. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Waldschmidt, G (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3574 EP 3576 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203101 ER PT B AU Waldschmidt, G Nassiri, A AF Waldschmidt, G Nassiri, A GP IEEE TI A coaxial subharmonic cavity design for direct injection at the advanced photon source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Coaxial subharmonic cavity designs are being investigated at the Advanced Photon Source to improve injector reliability by injecting beam directly froth the linac to the booster in storage ring top-up mode. The subharmonic system must operate jointly with the present 352-MHz booster to accelerate the beam to 7 GeV with minimal beam degradation. Design considerations must be made to ensure that bunch purity is maintained and that a large percentage of the Linac macropulse is captured. An analysis of rf cavity designs using electromagnetic simulation software has been conducted at 29 MHz and 117 MHz. Higher-order modes are evaluated as well as the total power loss and peak surface fields produced at the required gap voltage. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Waldschmidt, G (reprint author), Argonne Natl Lab, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3577 EP 3579 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203102 ER PT B AU Kang, Y Aleksandrov, A Anderson, D Champion, MM Champion, MS Crofford, M Deibele, C Dodson, G Fuja, R Gibson, P Gurd, P Hardek, T Johnson, G Ladd, P Ma, H McCarthy, M Piller, M Tang, J Vassioutchenko, A Williams, D Billen, J Bradley, J Rees, D Roybal, W Stovall, J Young, K Young, L AF Kang, Y Aleksandrov, A Anderson, D Champion, MM Champion, MS Crofford, M Deibele, C Dodson, G Fuja, R Gibson, P Gurd, P Hardek, T Johnson, G Ladd, P Ma, H McCarthy, M Piller, M Tang, J Vassioutchenko, A Williams, D Billen, J Bradley, J Rees, D Roybal, W Stovall, J Young, K Young, L GP IEEE TI Installation and testing for commissioning of normal conducting RF linac segment in the SNS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source (SNS) linac will deliver a 1.0 GeV proton beam to its accumulator ring. The normal conducting segment of the linac has a radio frequency quadrupole (RFQ), six drift tube linac (DTL) tanks powered by seven 402.5 MHz klystrons and four coupled cavity linac (CCL) modules powered by four 805 MHz klystrons that deliver the 180 MeV beam to the superconducting section of the linac (SCL) that employs eighty one 6-cell cavities powered by eighty-one 805 MHz klystrons. The normal conducting accelerating linac segment has been completely installed in the linac tunnel and successfully conditioned and commissioned. Corresponding high voltage converter modulator (HVCM) and low level RF (LLRF) control systems have been installed and tested. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Kang, Y (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 7 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3583 EP 3585 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203104 ER PT B AU Dobert, S Adolphsen, C Jones, R Lewandowski, J Li, Z Pivi, M Wang, J Higo, T AF Dobert, S Adolphsen, C Jones, R Lewandowski, J Li, Z Pivi, M Wang, J Higo, T GP IEEE TI Beam position monitoring using the HOM-signals from a damped and detuned accelerating structure SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Next and Global Linear Collider (NLC/GLC) designs require precision alignment of the beam in the accelerator structures to reduce short range wakefields. The moderately damped and detuned structures themselves provide suitable higher order mode (HOM) signals to measure this alignment. The modes in the lowest dipole band, whose frequencies range from 14-16 GHz, provide the strongest signals. To determine the position resolution they provide, an NLC/GLC prototype structure that was installed in the ASSET facility of the SLAG Linac was instrumented to downmix and digitize these signals. The beam position within the structure was determined by simultaneously measuring the signals at three frequencies (14.3, 15, 15.7 GHz) corresponding to modes localized at the beginning, the middle and the end of the 60 cm long structure. A resolution of 1 micron was achieved even With 28 dB signal attenuation, which is better than the 5 micron resolution required for the NLC/GLC. C1 SLAC, Menlo Pk, CA 94025 USA. RP Dobert, S (reprint author), SLAC, Menlo Pk, CA 94025 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3598 EP 3600 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203109 ER PT B AU Sekutowicz, J Ko, K Ge, L Lee, L Li, Z Ng, C Schussman, G Xiao, L Gonin, I Khabibouline, T Solyak, N Morozumi, Y Saito, K Kneisel, P AF Sekutowicz, J Ko, K Ge, L Lee, L Li, Z Ng, C Schussman, G Xiao, L Gonin, I Khabibouline, T Solyak, N Morozumi, Y Saito, K Kneisel, P GP IEEE TI Design of a low loss SRF cavity for the ILC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB An international team comprising SLAC, KEK, FNAL, JLAB and DESY is collaborating on the design, fabrication and test of a low loss, 1.3 GHz 9-cell SRF structure as a potential improvement for the ILC main tinac. The advantages of this structure over the TESLA structure include lower cryogenic loss, shorter rise time, and less stored energy. Among the issues to be addressed in this design are HOM damping, Lorentz force detuning and multipacting. We will report on HOM damping calculations using the parallel finite element eigenmode solver Omega3P and the progress made towards an optimized design. Studies on multipacting and estimates of the Lorentz force detuning will also be presented. C1 DESY, D-22607 Hamburg, Germany. SLAC, Menlo Pk, CA 94025 USA. RP Sekutowicz, J (reprint author), DESY, D-22607 Hamburg, Germany. NR 7 TC 0 Z9 0 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3622 EP 3624 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203117 ER PT B AU Rank, J Ben-Zvi, I Blaskiewicz, M Hahn, H McIntyre, G AF Rank, J Ben-Zvi, I Blaskiewicz, M Hahn, H McIntyre, G GP IEEE TI Design considerations for the mechanical tuner of the RHIC electron cooler SRF cavity SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The ECX Project, Brookhaven Lab's predecessor to the RHIC e-Cooler, includes a prototype RF tuner mechanism capable of both coarse and fast tuning. This tuner concept, adapted originally from a DESY design, has longer stroke and significantly higher loads attributable to the very stiff ECX cavity shape. Structural design, kinematics, controls, thermal and RF issues are discussed and certain improvements are proposed. 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 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3655 EP 3657 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203128 ER PT B AU Arkan, T Bauer, P Bellantoni, L Boffo, C Borissov, E Carter, H Edwards, H Foley, M Gonin, I Khabibouline, T Mishra, S Mitchell, D Polubotko, V Rowe, A Solyak, N Terechkine, I AF Arkan, T Bauer, P Bellantoni, L Boffo, C Borissov, E Carter, H Edwards, H Foley, M Gonin, I Khabibouline, T Mishra, S Mitchell, D Polubotko, V Rowe, A Solyak, N Terechkine, I GP IEEE TI Development of the superconducting 3.9 GHz accelerating cavity at Fermilab SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A superconducting third harmonic 3.9 GHz accelerating cavity was proposed to improve the beam quality in the TTF-like photoinjector[1]. Fermilab has developed, built and tested several prototypes, including two copper 9-cell cavities, one niobium 3-cell cavity, and one 9-cell cavity. The helium vessel and frequency tuner for the 9-cell cavity was built and tested as well. In cold tests, we achieved a peak surface magnetic field of similar to 100mT, well above the 70mT specification. The accelerating gradient was likely limited by thermal breakdown. Studies of the higher order modes in the cavity revealed that the existing cavity design with two HOM couplers will provide sufficient damping of these modes. In this paper we discuss the cavity design, results of the studies and plans for further development. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Arkan, T (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM solyak@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3658 EP 3660 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203129 ER PT B AU Ciovati, G Kneisel, P AF Ciovati, G Kneisel, P GP IEEE TI Preliminary results on the simultaneous excitation of the TM(010) and TE(011) modes in a single cell niobium cavity SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Simultaneous excitation of both TM(010) and TE(011) mode has been carried out on a CEBAF single cell cavity. The cavity has two beam pipe side-ports for each mode for input and pick-up couplers. Coupling to the TE(011) mode is done by magnetic loop couplers while for the TM(010) mode coaxial antennas are used. Simultaneous excitation of both TM and TE modes has been proposed recently for superconducting photoinjector applications to take advantage of the accelerating electric field of the TM mode, combined with the focusing magnetic field of the TE mode. The TE(011) mode has the property of having zero surface electric field, surface magnetic field orthogonal to the one in the TM(010) mode and concentrated in the iris/wall regions of the cavity. The presence of both modes in the cavity at the same time can also be used to investigate the so-called high field Q-drop in the TM(010) mode. This paper will present some preliminary result on the test of the single cell cavity at 2 K. C1 TJNAF, Newport News, VA 23606 USA. RP Ciovati, G (reprint author), TJNAF, Newport News, VA 23606 USA. EM gciovati@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3661 EP 3663 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203130 ER PT B AU Ciovati, G Kneisel, P Sekutowicz, J Singer, W AF Ciovati, G Kneisel, P Sekutowicz, J Singer, W GP IEEE TI Effects of electric and magnetic fields on the performance of a superconducting cavity SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A special two-cell cavity was designed to obtain surface field distributions suitable for investigation of electric and magnetic field effects on cavity performance. The cavity design and preliminary results were presented in a previous contribution. The bulk niobium cavity was heat-treated in a vacuum furnace at 125 degrees C to improve thermal conductivity. Three seamless hydroformed Nb/Cu cavities of the same design were fabricated to investigate the role of the electron beam welds located in high field areas. This paper will present RF test results at 2 K for the bulk niobium and one of the seamless cavities. C1 TJNAF, Newport News, VA 23606 USA. RP Ciovati, G (reprint author), TJNAF, Newport News, VA 23606 USA. EM gciovati@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3664 EP 3666 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203131 ER PT B AU Daly, EF Davis, GK Hicks, WR AF Daly, EF Davis, GK Hicks, WR GP IEEE TI Testing of the new tuner design for the CEBAF 12 GeV upgrade SRF cavities SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The new tuner design for the 12 GeV Upgrade SRF cavities consists of a coarse mechanical tuner and a fine piezoelectric tuner. The mechanism provides a 30:1 mechanical advantage, is pre-loaded at room temperature and tunes the cavities in tension only. All of the components are located in the insulating vacuum space and attached to the helium vessel, including the motor, harmonic drive and piezoelectric actuators. The requirements and detailed design are presented. Measurements of range and resolution of the coarse tuner are presented and discussed. 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. EM eddaly@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3667 EP 3669 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203132 ER PT B AU Hofler, A Delayen, J AF Hofler, A Delayen, J GP IEEE TI Simulation study of electronic damping of microphonic vibrations in superconducting cavities SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Electronic damping of microphonic vibrations in superconducting if cavities involves an active modulation of the cavity field amplitude in order to induce ponderomotive forces that counteract the effect of ambient vibrations on the cavity frequency. In lightly beam loaded cavities, a reduction of the microphonics-induced frequency excursions leads directly to a reduction of the rf power required for phase and amplitude stabilization. Jefferson Lab is investigating such an electronic damping scheme that could be applied to the JLab 12 GeV upgrade, the RIA driver, and possibly to energy-recovering superconducting linacs. This paper discusses a model and presents simulation results for electronic damping of microphonic vibrations. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Hofler, A (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. EM hofler@jlab.org; delayen@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3670 EP 3672 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203133 ER PT B AU Kneisel, P Ciovati, G Myneni, GR Singer, W Singer, X Proch, D Carneiro, T AF Kneisel, P Ciovati, G Myneni, GR Singer, W Singer, X Proch, D Carneiro, T GP IEEE TI Influence of Ta content in high purity niobium on cavity performance SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In a previous paper [1] we have reported about initial tests of single cell 1500 MHz cavities made from high purity niobium with three different Ta contents of 160 ppm, similar to 600 ppm and similar to 1400 ppm. These cavities had been treated by buffered chemical polishing several times and 100 pin, 200 mu m and 300 mu m of material had been removed from the surfaces. This contribution reports about subsequent tests following post purification heat treatments with Ti and '' in situ '' baking. As a result, all cavities exhibited increased quench fields due to the improved thermal conductivity after the heat treatment. After the '' in situ '' baking at 120 C for similar to 40 hrs the always present Q-drop at high fields disappeared and further improvements in accelerating gradient could be realized. Gradients as high as E(acc) = 35 MV/m were achieved and there were no clear indications that the cavity performance was influenced by the Ta content in the material. A multi-cell cavity from the high Ta content material has been fabricated and initial results are reported. C1 TJNAF, Newport News, VA 23606 USA. RP Kneisel, P (reprint author), TJNAF, Newport News, VA 23606 USA. EM kneisel@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3673 EP 3675 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203134 ER PT B AU Kneisel, P Myneni, GR Ciovati, G Sekutowicz, J Carneiro, T AF Kneisel, P Myneni, GR Ciovati, G Sekutowicz, J Carneiro, T GP IEEE TI Preliminary results from single crystal and very large crystal niobium cavities SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We have fabricated and tested several single cell cavities using material from very large grain niobium ingots. In one case the central grain exceeded 7 '' in diameter and this was used to fabricate two 2.2 GHz cavities. This activity had a dual purpose: to investigate the influence of grain boundaries on the often observed Q-drop at gradients E(acc) > 20 MV/m in the absence of field emission, and to study the possibility of using ingot material for cavity fabrication without going through the expensive rolling process. The sheets for these cavities were cut from the ingot by wire electro-discharge machining (EDM) and subsequently formed into half-cells by deep drawing. The following fabrication steps were standard: machining of weld recesses, electron beam welding of beam pipes onto the half cells and final equator weld to join both half cell/beam pipe subunits. The cavities showed heavy Q-disease caused by the EDM. After hydrogen degassing at 800 degrees C for 3 hrs in UHV and about 200 m total removals from the inner surface by BCP 1:1:1, the cavities showed promising results, however, the Q-drop was still present. In the two cavities made from large grain material accelerating gradients of 30 MV/m have been reached. After '' in-situ '' baking the Q-drop disappeared. The smaller cavities made from single crystal material showed very low residual resistances and accelerating gradients up to E(acc) = 45 MV/m were reached (one of the highest ever achieved), corresponding to a peak surface magnetic fields (B(p)) of 160 mT. In one rf test at 2 K, a B(p) = 185 mT was reached for few hundred milliseconds, close to the theoretical critical field of this material. C1 TJNAF, Newport News, VA 23606 USA. RP Kneisel, P (reprint author), TJNAF, Newport News, VA 23606 USA. EM kneisel@jlab.org RI Sekutowicz, Jacek/A-6561-2013 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3676 EP 3678 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203135 ER PT B AU Kneisel, P Ciovati, G Myneni, GR Wu, G Sekutowicz, J AF Kneisel, P Ciovati, G Myneni, GR Wu, G Sekutowicz, J GP IEEE TI Testing of HOM coupler designs on a single cell niobium cavity SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Coaxial higher order mode (HOM) couplers were developed initially for HERA cavities and subsequently for TESLA cavities. They were adopted later for SNS and Jlab upgrade cavities. The principle of operation is the rejection of the fundamental mode by the tunable filter and the transmission of the HOMs. It has been recognized recently that for continuous wave or high duty factor applications of the TESLA coupler the output pick-up probe must stay superconducting in order to avoid its heating by the fundamental mode residual magnetic field leading to deterioration of the cavity quality factor. In addition, the thermal conduction of existing rf feedthrough designs is only marginally sufficient to keep even the niobium probe tip superconducting in cw operation. We have equipped a single-cell niobium cavity with the modified HOM couplers and tested the new designs by measuring Q vs E(acc) behavior at 2 K for different feedthroughs and probe tip materials. C1 TJNAF, Newport News, VA 23606 USA. RP Kneisel, P (reprint author), TJNAF, Newport News, VA 23606 USA. EM kneisel@jlab.org RI Sekutowicz, Jacek/A-6561-2013 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3679 EP 3681 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203136 ER PT B AU Delayen, J Mammosser, J Ozelis, JP AF Delayen, J Mammosser, J Ozelis, JP GP IEEE TI Performance overview of the production superconducting RF cavities for the spallation neutron source linac SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB As part of its efforts for the SNS construction project, Jefferson Lab has produced 23 cryomodules for the superconducting linac. These modules contained 81 industrially produced multicell Nb accelerating cavities. Each of these cavities was individually tested before assembly into a cryomodule to verify that they achieved the required performance. This ensemble of cavities represents the 3rd largest set of production superconducting cavities fabricated and tested to date. The timely qualification testing of such a collection of cavities offers both challenges and opportunities. Their performance can be characterized by achieved gradient at the required Qo, achieved peak surface field, onset of field emission, and observations of multipacting. Possible correlations between cavity performance and process parameters; only really meaningful in the framework of a large scale production effort, will also be presented. In light of the potential adoption of these cavities for projects such as the Rare Isotope Accelerator or Fermilab Proton Driver, such an analysis is crucial to their success. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Delayen, J (reprint author), Jefferson Lab, Newport News, VA 23606 USA. EM delayen.mammosser.ozelis@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3682 EP 3684 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203137 ER PT B AU Reece, CE Daly, EF Manning, S Manus, R Morgan, S Ozelis, JP Turlington, L AF Reece, CE Daly, EF Manning, S Manus, R Morgan, S Ozelis, JP Turlington, L GP IEEE TI Fabrication and testing of the SRF cavities for the CEBAF 12 GeV upgrade prototype cryomodule Renascence SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Twelve seven-cell niobium cavities for the CEBAF 12 GeV upgrade prototype cryomodule Renascence have been fabricated at JLab and tested individually. This set includes four of the '' Low Loss '' (LL) design and eight of the '' High Gradient '' (HG) design. The fabrication strategy was an efficient mix of batch job-shop component machining and in-house EBW, chemistry, and final-step machining to meet mechanical tolerances. Process highlights will be presented. The cavities have been tested at 2.07 K, the intended CEBAF operating temperature. Performance exceeded the tentative design requirement of 19.2 MV/m CW with less than 29 W dynamic heat dissipation. These results, as well as the HOM damping performance are presented. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Reece, CE (reprint author), Jefferson Lab, Newport News, VA 23606 USA. EM reece@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3685 EP 3687 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203138 ER PT B AU Reece, CE Daly, EF Elliott, T Phillips, HL Ozelis, JP Rothgeb, T Wilson, K Wu, G AF Reece, CE Daly, EF Elliott, T Phillips, HL Ozelis, JP Rothgeb, T Wilson, K Wu, G GP IEEE TI High thermal conductivity cryogenic RF feed throughs for higher order mode couplers SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The use of higher-order-mode (NOM) pickup probes in the presence of significant fundamental RF fields can present a thermal challenge for CW or high average power SRF cavity applications. The electric field probes on the HOM-damping couplers on the JLab '' High Gradient '' (HG) and '' Low Loss '' (LL) seven-cell cavities for the CEBAF upgrade are exposed to approximately 10% of the peak magnetic field in the cavity. To avoid significant dissipative losses, these probes must remain superconducting during operation. Typical cryogenic rf feedthroughs provide a poor thermal conduction path for the probes and provide inadequate stabilization. We have developed solutions that meet the requirements, providing a direct thermal path from the niobium probe, thorough single-crystal sapphire, to bulk copper which can be thermally anchored. Designs, electromagnetic and thermal analyses, and performance data will be presented. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Reece, CE (reprint author), Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 23606 USA. EM reece@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3688 EP 3690 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203139 ER PT B AU Stirbet, M Wilson, KM Wiseman, M Henry, J Drury, M Davis, GK Grenoble, C Powers, T Myneni, G Campisi, IE Kang, Y Stout, D AF Stirbet, M Wilson, KM Wiseman, M Henry, J Drury, M Davis, GK Grenoble, C Powers, T Myneni, G Campisi, IE Kang, Y Stout, D GP IEEE TI RF conditioning and testing of fundamental power couplers for SNS superconducting cavity production SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source (SNS) makes use of 33 medium beta (0.61) and 48 high beta (0.81) superconducting cavities. Each cavity is equipped with a fundamental power coupler, which should withstand the full klystron power of 550 kW in full reflection for the duration of an RF pulse of 1.3 msec at 60 Hz repetition rate. Before assembly to a superconducting cavity, the vacuum components of the coupler are submitted to acceptance procedures consisting of preliminary quality assessments, cleaning and clean room assembly, vacuum leak checks and baking under vacuum, followed by conditioning and RF high power testing. Similar acceptance procedures (except clean room assembly and baking) were applied for the airside components of the coupler. All 81 fundamental power couplers for SNS superconducting cavity production have been RF power tested at JLAB Newport News and, beginning in April 2004 at SNS Oak Ridge. This paper gives details of coupler processing and RF high power-assessed performances. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Stirbet, M (reprint author), Jefferson Lab, Newport News, VA 23606 USA. EM Mircea.Stirbet@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3691 EP 3693 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203140 ER PT B AU Wu, AT Ike, R Phillips, HL Valente, AM Wang, H Wu, G AF Wu, AT Ike, R Phillips, HL Valente, AM Wang, H Wu, G GP IEEE TI Surface study of Nb/Cu films for cavity deposition by ECR plasma SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Niobium (Nb) thin film deposited on copper (Cu) cavities through electron cyclotron resonance (ECR) plasma appears to be an attractive alternative technique for fabricating superconducting radio frequency cavities to be used in particle accelerators. The performance of these obtained Nb/Cu cavities is expected to depend on the surface characteristics of the Nb films. In this report, we investigate the influence of deposition energy on surface morphology, microstructure, and chemical composition of Nb films deposited on small Cu disks employing a metallographic optical microscope, a 3-D profilometer, a scanning electron microscope, and a dynamic secondary ion mass spectrometry. The results will be compared with those obtained on Nb surfaces treated by BCP, EP, and BEP. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Wu, AT (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. EM andywu@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3694 EP 3696 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203141 ER PT B AU Wang, H Wu, G Phillips, HL Rimmer, RA Valente, AM Wu, AT AF Wang, H Wu, G Phillips, HL Rimmer, RA Valente, AM Wu, AT GP IEEE TI Niobium thin film coating on a 500-MHz copper cavity by plasma deposition SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A system using an Electron Cyclotron Resonance (ECR) plasma source for the deposition of a thin niobium film inside a copper cavity for superconducting accelerator applications has been designed and is being constructed. The system uses a 500-MHz copper cavity as both substrate and vacuum chamber. The ECR plasma will be created to produce direct niobium ion deposition. The central cylindrical grid is DC biased to control the deposition energy. This paper describes the design of several subcomponents including the vacuum chamber, RF supply, biasing grid and magnet coils. Operational parameters are compared between an operating sample deposition system and this system. Engineering progress toward the first plasma creation will be reported here. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Wang, H (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. EM haipeng@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3697 EP 3699 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203142 ER PT B AU Wang, HP Rimmer, R Wu, GF AF Wang, HP Rimmer, R Wu, GF GP IEEE TI Elliptical cavity shape optimization for acceleration and HOM damping SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We report a survey of center cell shapes developed for Superconducting Radio Frequency (SRF) multi-cell cavities for different projects. Using a set of normalized parameters, we compare the designs for different frequencies and particle velocities for the fundamental mode. Using dispersion curves of High Order Modes (HOM) (frequency verse phase advance) calculated by MAFIA for a single cell, we further optimize the cavity shape to avoid a light cone line crossing at the dangerous resonance frequencies determined by the beam bunch structure and eliminate the trapped (or high R/Q) modes with a low group velocity. We developed this formulation to optimize a 5-cell, 750MHz cavity shape, with good real-estate accelerating gradient and a strong HOM damping waveguide structure for the JLab 1MW ERL-FEL project. C1 TJNAF, Newport News, VA 23606 USA. RP Wang, HP (reprint author), TJNAF, Newport News, VA 23606 USA. EM haipeng@jlab.org NR 19 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3700 EP 3702 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203143 ER PT B AU Tajima, T Findikoglu, AT Jason, A Krawczyk, FL Mueller, FM Shapiro, AH Geng, RL Padamsee, H Romanenko, A Moeckly, BH AF Tajima, T Findikoglu, AT Jason, A Krawczyk, FL Mueller, FM Shapiro, AH Geng, RL Padamsee, H Romanenko, A Moeckly, BH GP IEEE TI Power dependence of the RF surface resistance of MgB(2) superconductor SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID FIELD-DEPENDENCE; FILMS; YBA2CU3O7-X AB Magnesium diboride (MgB(2)) is a superconducting material that has a transition temperature (T(c)) of similar to 40 K, which is similar to 30 K higher than niobium (Nb) that has been used for most superconducting RF cavities in the past decades. Last year, it was demonstrated that the RF surface resistance of MgB(2) can be lower than Nb at 4 K. One of the problems with other high-T. materials such as YBCO was its rapid increase in RF surface resistance with higher surface magnetic fields. Recently, we have shown that MgB(2) shows little increase in the surface resistance up to similar to 120 Oe, equivalent of an accelerating field of similar to 3 MV/m. The highest field tested was limited by available power. This result is encouraging and has made us consider fabrication of a cavity coated with MgB2 and test it. Also, there is a potential that this material has a higher critical magnetic field that enables the cavity to run at a higher gradient than Nb cavities in addition to the possibility of operation at higher temperatures. C1 LANL, Los Alamos, NM 87545 USA. RP Tajima, T (reprint author), LANL, Los Alamos, NM 87545 USA. EM tajima@lanl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3703 EP 3705 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203144 ER PT B AU Shepard, KW Kelly, MP Fuerst, JD Kedzie, M Conway, ZA AF Shepard, KW Kelly, MP Fuerst, JD Kedzie, M Conway, ZA GP IEEE TI Prototype superconducting triple-spoke cavity for beta=0.63 SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This paper reports the development status of a 345 MHz, three-spoke-loaded, TEM-class superconducting cavity with a transit-time factor peaked at = v/c = 0.63. The cavity has a 4 cm diameter beam aperture, a transverse diameter of 45.8 cm, and an interior length of 85 cm. The, cavity is the second of two three-spoke loaded cavities being developed for the RIA driver linac and other high-intensity ion linac applications. Construction of a prototype niobium cavity has been completed and the cavity has been chemically processed. Results of initial cold tests are discussed. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Shepard, KW (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3721 EP 3723 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203150 ER PT B AU Shepard, KW Kelly, MP Fuerst, JD Kedzie, M Conway, ZA AF Shepard, KW Kelly, MP Fuerst, JD Kedzie, M Conway, ZA GP IEEE TI Superconducting triple-spoke cavity for=0.5 ions SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This paper reports results of cold tests of a 345 MHz, three-spoke-loaded TEM-class superconducting niobium cavity being developed for the RIA driver linac and for other high-intensity ion linac applications. The cavity has a beam aperture of 4 cm diameter, an interior length of 67 cm, and the transit-time factor peaks at = v/c = 0.5. In tests at 4.2 k, the cavity could be operated cw above the nominal design accelerating gradient of 9.9 MV/m, which corresponds to peak surface fields of 27.5 MV/m electric and 850 gauss magnetic. At this gradient the cavity provides more than 6 MV of accelerating potential. Cavity Q at 9.3 MV/m exceeded the nominal performance goal of 7.3x10(8). Operation at the design gradient at 4.2 K causes substantial boiling and two-phase flow in the liquid helium coolant, with the potential for microphonic-induced fluctuations of the rf frequency. Total microphonic rf frequency fluctuations were less than 1 Hz RMS operating cw at 9.7 MV/m at 4.2 K. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Shepard, KW (reprint author), Argonne Natl Lab, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3724 EP 3726 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203151 ER PT B AU Seryi, A AF Seryi, A GP IEEE TI The ILC beam delivery system - Conceptual design and R&D plans SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Beam Delivery System of the ILC has many stringent and sometimes conflicting requirements. To produce luminosity, the beams must be focused to nanometer size. To provide acceptable detector backgrounds, particles far from the beam core must be collimated. Unique beam diagnostics and instrumentation are required to monitor parameters of the colliding beams such as the energy spectrum and polarization. The detector and beamline components must be protected against errant beams. After collision, the beams must also be transported to the beam dumps safely and with acceptable losses. An international team is actively working on the design of the ILC Beam Delivery System in close collaboration. Details of the design, recent progress and remaining challenges will be summarized in this paper. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Seryi, A (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM seryi@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3740 EP 3744 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203155 ER PT B AU Rose, H Wan, W AF Rose, H Wan, W GP IEEE TI Aberration correction in electron microscopy SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Spherical and chromatic aberrations limit the resolution of conventional electron microscopes. Both defects are unavoidable in the case of static rotationally symmetric electromagnetic fields (Scherzer's theorem). To compensate for these aberrations, multipole correctors or electron mirrors are required. The correction of the resolution-limiting aberrations is demonstrated for the hexapole corrector, the quadrupole-octopole corrector and the tetrode mirror. Electron mirrors require a magnetic beam separator, which must be free of second-order aberrations. The multipole correctors are highly symmetric telescopic systems compensating for the defects of the round lenses. The hexapole corrector has the simplest structure yet eliminates only third-order spherical aberration and coma, whereas the mirror and the quadrupole-octopole (QO) corrector are able to correct the chromatic aberration as well. The QO corrector eliminates chromatic aberration by means of crossed electric and magnetic quadrupoles and the third-order spherical aberration by octopoles. At present, aberration-corrected electron microscopes obtain a resolution limit of about 1 Angstroem. C1 LBNL, Berkeley, CA 94720 USA. RP Rose, H (reprint author), LBNL, Berkeley, CA 94720 USA. NR 9 TC 0 Z9 0 U1 4 U2 7 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3784 EP 3788 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203166 ER PT B AU Blind, B Jason, AJ AF Blind, B Jason, AJ GP IEEE TI Chromatically corrected imaging systems for charged-particle radiography SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In proton radiography, imaging with systems consisting of quadrupole magnets is an established technique for viewing the material distribution and composition of objects, either statically or during fast events such as explosions. With the standard magnet configuration, the -I lens, chromatic aberrations generally dominate the image blur. Image resolution can be improved, and largely decoupled from the input-beam parameters, by using a second-order achromat with some additional higher-order aberration correction. The aberration-correction approach is discussed. For a given resolution, such an achromat allows use of much lower-energy imaging particles than a -I lens. Each achromat design can be scaled into many equivalent systems; an 800-MeV proton design and its equivalent 40-MeV electron system are presented. The electron system is useful for imaging thin objects. Magnet errors in the achromats must be tightly controlled to preserve image quality, but not beyond feasibility of present technology. System performance is verified by particle tracking. Configurations alternative to the canonical achromat are discussed. C1 LANL, Los Alamos, NM 87544 USA. RP Blind, B (reprint author), LANL, Los Alamos, NM 87544 USA. EM bblind@lanl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3789 EP 3793 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203167 ER PT B AU Deriy, B Hillman, A Sprau, G Wang, J AF Deriy, B Hillman, A Sprau, G Wang, J GP IEEE TI The APS septum magnet power supplies upgrade SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The higher requirements for beam injection stability at the APS storage ring (SR) demand improvement of pulsed power supplies for the septum magnets. The new specification for the current repeatibility is 1/2000. The upgrade will be performed in two stages. In the first stage we will implement a new voltage regulation circuit in the power supply with a new timing sequence that will provide better voltage regulation performance. A common design is made for all of the septum magnet power supplies (SMPSs) at the APS. The new regulation module has already been tested on both thin and thick SMPSs. The test shows that the achieved voltage regulation is much better than 1/2000. Combined with a current feedback loop, it can provide a shot-to-shot current repeatability better than 1/2000. The second phase of the upgrade will develop the current feedback loop and control algorithm. This paper will decribe the design and test results for the first phase only. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Deriy, B (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. EM bderiy@aps.anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3795 EP 3797 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203229 ER PT B AU Pilat, F Luo, Y Malitsky, N Ptitsyn, V AF Pilat, F Luo, Y Malitsky, N Ptitsyn, V GP IEEE TI Beam-based non-linear optics corrections in colliders SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A method has been developed to measure and correct operationally the non-linear effects of the final focusing magnets in colliders, that gives access to the effects of multi-pole errors by applying closed orbit bumps, and analyzing the resulting tune and orbit shifts. This technique has been tested and used during 4 years of RHIC (the Relativistic Heavy Ion Collider at BNL) operations. I will discuss here the theoretical basis of the method, the experimental set-up, the correction results, the present understanding of the machine model, the potential and limitations of the method itself as compared with other non-linear correction techniques. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Pilat, F (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3802 EP 3806 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203170 ER PT B AU Henderson, S Chu, P Cousineau, S Danilov, V Holmes, J Pelaia, T Plum, M AF Henderson, S Chu, P Cousineau, S Danilov, V Holmes, J Pelaia, T Plum, M GP IEEE TI Techniques for measurement and correction of the SNS accumulator ring optics SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source (SNS) Accumulator Ring will reach peak intensities of 1.5x10(14) protons/pulse through multi-turn charge-exchange injection. Accumulation of these unprecedented beam intensities must be accomplished while maintaining extremely low losses (less than 1 W/m). It is anticipated that the understanding and control of the ring optics will be important for achieving these low loss rates. We describe our plans for measuring and correcting the optical functions of the accumulator ring lattice. C1 Oak Ridge Natl Lab, Spallat Neutron Source Project, Oak Ridge, TN 37831 USA. RP Henderson, S (reprint author), Oak Ridge Natl Lab, Spallat Neutron Source Project, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3812 EP 3814 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203172 ER PT B AU Wienands, U AF Wienands, U GP IEEE TI Lepton collider operation with constant currents SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Electron-positron colliders have been operating in a top-up-and-coast fashion with a cycle time depending on the beam life time, typically one or more hours. Each top-up involves ramping detector systems in addition to the actual filling time. The loss in accumulated luminosity may be 20-50%. During the last year, both B-Factories have commissioned a continuous-injection mode of operation in which beam is injected without ramping the detector, thus raising luminosity integration by always operating at peak luminosity. Constant beam currents also reduce thermal drift and trips caused by change in beam loading. To achieve this level of operation, special efforts were made to reduce the injection losses and also to implement gating procedures in the detectors, minimizing dead time. Beam collimation can reduce injection noise but also cause an increase in background rates. A challenge can be determining beam lifetime, important to maintain tuning of the beams. C1 SLAC, Stanford, CA USA. RP Wienands, U (reprint author), SLAC, Stanford, CA USA. EM uli@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3823 EP 3827 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203175 ER PT B AU Pozdeyev, E Marti, F York, RC Rodriguez, J AF Pozdeyev, E Marti, F York, RC Rodriguez, J GP IEEE TI Experimental results from the small isochronous ring SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Small Isochronous Ring (SIR) is a compact, low-energy storage ring designed to investigate the beam dynamics of high-intensity isochronous cyclotrons and synchrotrons at the transition energy. The ring was developed at Michigan State University (MSU) and has been operational since December 2003. It stores 20 keV hydrogen beams with a peak current of 10-20 microamps for up to 200 turns. The transverse and longitudinal profiles of extracted bunches are measured with an accuracy of approximately 1 mm. The high accuracy of the measurements makes the experimental data attractive for validation of multi-particle space charge codes. The results obtained in the ring show a fast growth of the energy spread induced by the space charge forces. The energy spread growth is accompanied by a breakup of the beam bunches into separated clusters that are involved in the vortex motion specific to the isochronous regime. The experimental results presented in the paper show a remarkable agreement with simulations performed with the code CYCO. In this paper, we discuss specifics of space charge effects in the isochronous regime, present results of experiments in SIR, and conduct a detailed comparison of the experimental data with results of simulations. C1 JLab, Newport News, VA 23606 USA. RP Pozdeyev, E (reprint author), JLab, Newport News, VA 23606 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3831 EP 3835 PG 5 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203177 ER PT B AU Casagrande, F Campisi, I Gurd, P Hatfield, D Howell, M Stout, D Strong, H Arenius, D Creel, J Dixon, K Ganni, V Knudsen, P AF Casagrande, F Campisi, I Gurd, P Hatfield, D Howell, M Stout, D Strong, H Arenius, D Creel, J Dixon, K Ganni, V Knudsen, P GP IEEE TI Status of the cryogenic system commissioning at SNS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source (SNS) is under construction at Oak Ridge National Laboratory. The cold section of the Linac consists of 81 superconducting radio frequency cavities cooled to 2.1K by a 2400 Watt cryogenic refrigeration system. The major cryogenic system components include warm helium compressors with associated oil removal and gas management, 4.5K cold box, 7000L liquid helium dewar, 2.1K cold box (consisting of 4 stages of cold compressors), gaseous helium storage, helium purification and gas impurity monitoring system, liquid nitrogen storage and the cryogenic distribution transfer line system. The overall system commissioning strategy and status will be presented. C1 Oak Ridge Natl Lab, SNS Project, Oak Ridge, TN 37831 USA. RP Casagrande, F (reprint author), Oak Ridge Natl Lab, SNS Project, POB 2008, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3848 EP 3850 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203182 ER PT B AU Kroc, TK Schmidt, CW Shemyakin, A AF Kroc, TK Schmidt, CW Shemyakin, A GP IEEE TI Magnetic shielding of an electron beamline in a hadron accelerator enclosure SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Fermilab Electron Cooling Project requires the operation of a 4.34 MeV electron beam in the same enclosure that houses the 120, 150 GeV Main Injector. Effective shielding of the magnetic fields from the ramped electrical busses and local static fields is necessary to maintain the high beam quality and recirculation efficiency required by the electron cooling system. This paper discusses the operational tolerances and the design of the beamline shielding, bus design, and bus shielding as well as experimental results from the prototype and final installation. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Kroc, TK (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM kroc@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3899 EP 3901 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203199 ER PT B AU Prebys, E AF Prebys, E GP IEEE TI Radiation issues for Fermilab Booster magnets SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The demands of the Fermilab neutrino program will require the lab's 30+ year old 8 GeV Booster to deliver higher intensities than it ever has. Total proton throughput is limited by radiation damage and activation due to beam loss in the Booster tunnel. Of particular concern is the epoxy resin that acts as the insulation in the 96 combined function lattice magnets. This paper describes a simulation study to determine the integrated radiation dose to this epoxy and a discussion of the potential effects. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Prebys, E (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM prebys@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3902 EP 3904 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203200 ER PT B AU Shiltsev, V Zhang, XL Kuznetsov, G Pfeffer, H Saewert, G Semenov, A Wolff, D Hively, R Kamerdzhiev, V Martinez, A Klebaner, A Bishofberger, K Tiunov, M Kuzmin, A Bogdanov, I Kashtanov, E Kozub, S Sytnik, V Tkachenko, L AF Shiltsev, V Zhang, XL Kuznetsov, G Pfeffer, H Saewert, G Semenov, A Wolff, D Hively, R Kamerdzhiev, V Martinez, A Klebaner, A Bishofberger, K Tiunov, M Kuzmin, A Bogdanov, I Kashtanov, E Kozub, S Sytnik, V Tkachenko, L GP IEEE TI Tevatron Beam-Beam Compensation project progress SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB In this paper, we report the progress of the Tevatron Beam-Beam Compensation (BBC) project [1]. Proton and antiproton tuneshifts of the order of 0.009 induced by electron beam have been reported in [2], suppression of an antiproton emittance growth in the Tevatron High Energy Physics (HEP) store has been observed, too [1]. Currently, the first electron lens (TEL1) is in operational use as the Tevatron DC beam cleaner. Over the last two years, we have greatly improved its reliability. The 2nd Tevatron electron lens (TEL2) is under the final phase of development and is being prepared for installation in the Tevatron in 2005. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Shiltsev, V (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3905 EP 3907 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203201 ER PT B AU Stein, W Ahle, LE Conner, DL AF Stein, W Ahle, LE Conner, DL GP IEEE TI Mechanical design of a heavy ion beam dump for the RIA fragmentation line SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The RIA fragmentation line requires a beam stop for the primary beam downstream of the first dipole magnet. The beam may consist of U, Ca, Sn, Kr, or O ions. with a variety of power densities. The configuration with highest power density is for the U beam, with a spot size of 3 cm x 3 cm and a total power of up to 300 kW. The mechanical design of the dump that meets these criteria consists of a 70 cm diameter aluminum wheel with water coolant channels. A hollow drive shaft supplies the coolant water and connects the wheel to an electrical motor located in an adjacent air space. The beam strikes the wheel along the outer perimeter and passes through a thin window of aluminum where 15% of its power is absorbed and the remainder of the beam is absorbed in flowing water behind the window. Rotation of the wheel at 400 RPM results in maximum aluminum temperatures below 100 degrees C and acceptably low thermal stresses of 3 ksi. Rotating the wheel also results in low radiation damage levels by spreading the damage out over the whole perimeter of the wheel. For some of the other beams, a stationary dump consisting of a thin aluminum window with water acting as a coolant and absorber appears to be feasible. C1 LLNL, Livermore, CA 94550 USA. RP Stein, W (reprint author), LLNL, Livermore, CA 94550 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3911 EP 3913 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203203 ER PT B AU Anderson, S Spencer, J Wolf, Z Baldwin, A Pellett, D Boussoufi, M AF Anderson, S Spencer, J Wolf, Z Baldwin, A Pellett, D Boussoufi, M GP IEEE TI Fast neutron damage studies on NdFeB materials SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID MAGNETIC-PROPERTIES; PERMANENT-MAGNETS; TEMPERATURE; IRRADIATION AB Many materials and electronics need to be tested for the radiation environment expected at linear colliders (LC) since both accelerator and detectors will be subjected to large fluences of hadrons, leptons and gamma's over the life of the facility[1]. While the linacs will be superconducting, there are still many uses for NdFeB in the damping rings, injection and extraction lines and final focus. Our understanding of the situation for rare earth, permanent magnet materials was presented at PAC03[2]. Our first measurements of fast neutron, stepped doses at the UC Davis McClellan Nuclear Reactor Center (UCD MNRC) were presented at EPAC04[3]. We have extended the doses, included other manufacturer's samples, and measured induced radioactivities which are discussed in detail. C1 SLAC, Menlo Pk, CA 94025 USA. RP Anderson, S (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM jus@SLAC.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3914 EP 3916 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203204 ER PT B AU Lee, Y Mahler, G Meng, W Raparia, D Wang, L Wei, J AF Lee, Y Mahler, G Meng, W Raparia, D Wang, L Wei, J GP IEEE TI SNS ring injection stripped electron collection: Design analysis and technical issues SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This paper describes the simulation studies on the motions of stripped electrons generated in the injection section of the Spallation Neutron Source (SNS) accumulator ring and the effective collection mechanism. Such studies are important for high intensity machines, in order to reduce beam loss and protect other components in the vicinity. The magnetic field is applied to guide electrons to a collector, which is located at the bottom of the beam vacuum chamber. Part of the study results with and without considering the interactions between electrons and materials are presented and discussed. The final engineering design of the electron collector (catcher) Is also described. C1 Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA. RP Lee, Y (reprint author), Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA. EM yylee@bnl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3917 EP 3919 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203205 ER PT B AU McCrady, RC AF McCrady, RC GP IEEE TI Harmonic analysis of linac alignment SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB An analysis is being performed of the requirements on alignment of the focusing elements (quadrupole doublets) in the Los Alamos Neutron Science Center (LANSCE) side coupled linac. The analysis is performed in terms of harmonics of the quadrupole spacing. This allows one to determine the effect of intentional deviations from a straight line, such as following the curvature of the Earth, and of unintentional deviations introduced by measurement and alignment errors. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP McCrady, RC (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3920 EP 3922 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203206 ER PT B AU Error, J Bruce, D Fazekas, J Helus, S Maines, J AF Error, J Bruce, D Fazekas, J Helus, S Maines, J GP IEEE TI Deformation monitoring of the Spallation Neutron Source (SNS)* tunnels SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The SNS Project is a 1.4 MW accelerator-based neutron source located at Oak Ridge National Laboratory in Oak Ridge, Tennessee. For shielding purposes, 5 meters of native soil backfill has been placed on top of the accelerator tunnel system. This backfill has caused ongoing settlement of the tunnels. The settlement has been monitored by the SNS Survey and Alignment Group in order to determine the patterns of deformation, and to determine when the tunnel system will be stable enough for precise alignment of beam line components. The latest monitoring results indicate that the settlement rate has significantly decreased. This paper introduces the techniques and instrumentation of the monitoring surveys, and describes the types and magnitudes of deformation found. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Error, J (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3923 EP 3925 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203207 ER PT B AU Gibson, P Aleksandrov, A Champion, M Dodson, G Schubert, J Tang, J AF Gibson, P Aleksandrov, A Champion, M Dodson, G Schubert, J Tang, J GP IEEE TI Resonance control cooling system performance and developments SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source (SNS) is an acceleratorbased neutron source being built at Oak Ridge National Laboratory. The warm linac portion, designed by Los Alamos, has been installed and commissioned. The warn linac is comprised of six Drift Tube Linac (DTL) tanks and four Coupled Cavity Linac (CCL) modules. For commissioning purposes the accelerating systems have been operated at less than the design 6% duty factor. During lower power operation there is less RF cavity heating. This decrease in heat load causes operational stability issues for the associated Resonance Control Cooling Systems (RCCSs) which were designed for full duty factor operation. To understand this effect operational results have been analyzed and tests have been performed. External system factors have been explored and the resulting impacts defined. Dynamic modeling of the systems has been done via a collaboration with the Institute for Nuclear Research (INR), Moscow, Russia. New RCCS operation code has been implemented. Increases in system performance achieved and solutions employed will be presented. C1 Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 USA. RP Gibson, P (reprint author), Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3926 EP 3928 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203208 ER PT B AU Helus, S Bruce, D Error, J Fazekas, J Maines, J AF Helus, S Bruce, D Error, J Fazekas, J Maines, J GP IEEE TI Optical tooling and its uses at the spallation neutron source (SNS) SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Optical tooling has been a mainstay of the accelerator alignment community for decades. Even now in the age of electronic survey equipment, optical tooling remains a viable alternative, and at times, the only alternative. At SNS, we combine traditional optical tooling alignment methods, instrumentation, and techniques, with the more modern electronic techniques. This paper details with the integration of optical tooling into the electronic survey world. C1 Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 USA. RP Helus, S (reprint author), Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3929 EP 3931 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203209 ER PT B AU Jeon, DO AF Jeon, DO GP IEEE TI Comparison of techniques for longitudinal tuning of the SNS drift tube linac SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB It is important to bring the cavity rf field amplitude and phase to the design for a high intensity linac such as the Spallation Neutron Source (SNS) linac. A few techniques are available such as the longitudinal acceptance scan and phase scan. During the SNS linac commissioning, tuning of cavities was conducted using the acceptance scan and phase scan technique based on multiparticle simulations. The two techniques are compared. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Jeon, DO (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM jeond@ornl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3932 EP 3934 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203210 ER PT B AU Roseberry, T Assadi, S Murdoch, G AF Roseberry, T Assadi, S Murdoch, G GP IEEE TI Development of a new beam diagnostics platform SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source Project (SNS) is an accelerator-based neutron source currently under construction at Oak Ridge National Laboratory (ORNL). The availability of space along completed portions of the accelerator for the addition of beam diagnostics is limited. A new platform for mounting a variety of instruments has been created by replacing part of the Medium Energy Beam Transport (MEBT) section of the accelerator developed by Lawrence Berkeley National Laboratory. The design and current capabilities of this instrument platform will be presented along with plans for future enhancements. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Roseberry, T (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3935 EP 3937 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203211 ER PT B AU Ruffin, A Dodson, G Giannella, M Williams, T AF Ruffin, A Dodson, G Giannella, M Williams, T GP IEEE TI Beam loss and residual activation trending SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The SNS Front End, the Drift Tube Linac, and most of the Coupled Cavity Linac have been operated during commissioning. Beam loss data were taken with differential Beam Current Monitors, and Beam loss Monitors during commissioning. Residual activation data were taken at various times during and after the run. An analysis of beam loss trending, beam loss monitor data and residual activation will be shown. C1 Oak Ridge Natl Lab, SNS Project, Oak Ridge, TN 37830 USA. RP Ruffin, A (reprint author), Oak Ridge Natl Lab, SNS Project, Oak Ridge, TN 37830 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3938 EP 3940 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203212 ER PT B AU Li, D Green, MA Virostek, SP Zisman, MS Lau, W White, AE Yang, SQ AF Li, D Green, MA Virostek, SP Zisman, MS Lau, W White, AE Yang, SQ GP IEEE TI Progress on the RF coupling coil module design for the mice channel SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We describe die progress on the design of die RF coupling coil (RFCC) module for the international Muon Ionization Cooling Experiment (MICE) at Rutherford Appleton Laboratory (RAL) in the UK. The MICE cooling channel design consists of one SFOFO cell that is similar to that of the US Study-II of a neutrino factory. The MICE RFCC module comprises a superconducting solenoid, mounted around four normal conducting 201.25-MHz RF cavities. Each cavity has a pair of thin curved beryllium windows to close die conventional open beam irises, which allows for independent control of the phase in each cavity and for the RF power to be fed separately. The coil package that surrounds the RF cavities is mounted on a vacuum vessel. The RF vacuum is shared between die cavities and the vacuum vessel around the cavities such that there is no differential pressure on die thin beryllium windows. This paper discusses die design progress of the RFCC module and die fabrication progress of a prototype 201.25-MHz cavity. C1 LBNL, AFRD, Berkeley, CA 94720 USA. RP Li, D (reprint author), LBNL, AFRD, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3947 EP 3949 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203215 ER PT B AU Boles, JL Reyes, S Ahle, LE Stein, W AF Boles, JL Reyes, S Ahle, LE Stein, W GP IEEE TI Neutronics assessments for a RIA fragmentation line beam dump concept SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Heavy ion and radiation transport calculations are in progress for conceptual beam dump designs for the fragmentation line of the proposed Rare Isotope Accelerator (RIA). Using the computer code PHITS, a preliminary design of a motor-driven rotating wheel beam dump and adjacent downstream multipole has been modeled. Selected results of these calculations are given, including neutron and proton flux in the wheel, absorbed dose and displacements per atom in the hub materials, and beating from prompt radiation and from decay heat in the multipole. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Boles, JL (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. EM boles1@llnl.gov NR 2 TC 0 Z9 0 U1 3 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3956 EP 3958 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203218 ER PT B AU Reyes, S Boles, JL Ahle, LE Stein, W Wirth, BD AF Reyes, S Boles, JL Ahle, LE Stein, W Wirth, BD GP IEEE TI Irradiation effects on RIA fragmentation Cu beam dump SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Within the scope of conceptual research and development (R&D) activities in support of the Rare Isotope Accelerator (RIA) facility, high priority is given to the development of high-power fragmentation beam dumps. A pre-study was made of a static water-cooled Cu beam dump that can meet requirements for a 400 MeV/A uranium beam. The issue of beam sputtering was addressed and found to be insignificant. Preliminary radiation transport simulations show significant damage (in displacements per atom, DPA) in the vicinity of the Bragg peak of the uranium ions. Experimental data show that defects in Cu following neutron or high-energy particle irradiation tend to saturate at doses between I and 5 DPA, and this saturation in defect density also results in saturation of mechanical property degradation. However, effects of swift heavy ion irradiation and the production of gaseous and solid transmutant elements still need to be addressed. Initial calculations indicate that He concentrations on the order of 400 appm are produced in the beam dump after several weeks of continuous operation and He embrittlement may be a concern. Recommendations are made for further investigation of Cu irradiation effects for RIA-relevant conditions. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Reyes, S (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. EM reyes20@llnl.gov RI Wirth, Brian/O-4878-2015 OI Wirth, Brian/0000-0002-0395-0285 NR 8 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3959 EP 3961 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203219 ER PT B AU Allison, T Higgins, S Martin, E Merz, W Philip, S AF Allison, T Higgins, S Martin, E Merz, W Philip, S GP IEEE TI Jefferson Lab's Trim Card II SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Jefferson Lab's Continuous Electron Beam Accelerator Facility (CEBAF) uses Trim Card I power supplies to drive approximately 1900 correction magnets. These trim cards have had a long and illustrious service record. However, some of the employed technology is now obsolete, making it difficult to maintain the system and retain adequate spares. The Trim Card 11 is being developed to act as a transparent replacement for its aging predecessor. A modular approach has been taken in its development to facilitate the substitution of sections for future improvements and maintenance. The resulting design has been divided into a motherboard and 7 daughter cards which has also allowed for parallel development. The Trim Card II utilizes modern technologies such as a Field Programmable Gate Array (FPGA) and a microprocessor to embed trim card controls and diagnostics. These reprogranunable devices also provide the versatility to incorporate future requirements. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Allison, T (reprint author), Jefferson Lab, Newport News, VA 23606 USA. EM allison@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3983 EP 3985 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203227 ER PT B AU Bellomo, P Lipari, JJ de Lira, AC Rafael, FS AF Bellomo, P Lipari, JJ de Lira, AC Rafael, FS GP IEEE TI PEP-II large power supplies rebuild program at SLAC SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Seven large power supplies (LGPS) with output ratings from 72kW to 270kW power PEP-II quad magnets in the electron-positron collider region. These supplies have posed serious maintenance and reliability problems since they were installed in 1997, resulting in loss of accelerator availability. A redesign/rebuild program was undertaken by the SLAC Power Conversion Department. During the 2004 summer shutdown all the control circuits in these supplies were redesigned and replaced. A new PWM control board, programmable logic controller, and touch panel have been installed to improve LGPS reliability, and to make troubleshooting easier. In this paper we present the details of this rebuilding program and results. C1 SLAC, Menlo Pk, CA 94025 USA. RP Bellomo, P (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM delira@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3986 EP 3988 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203228 ER PT B AU Hillman, A Pasky, S Sereno, N Soliday, R Wang, J AF Hillman, A Pasky, S Sereno, N Soliday, R Wang, J GP IEEE TI Injector power supplies reliability improvements at the advanced photon source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Operational goals for the Advanced Photon Source (APS) facility include 97% availability and a mean time between unscheduled beam losses (faults) of 70 hours, with more than 5000 user hours of scheduled beam per year. To meet this objective, our focus has been maximizing the mean time between faults (MTBF). We have made various hardware and software improvements to better operate and monitor the injector power supply systems. These improvements have been challenging to design and implement in light of the facility operating requirements but are critical to maintaining maximum reliability and availability of beam for user operations. This paper presents actions taken as well as future plans to continue improving injector power supply hardware and software to meet APS user operation goals. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Hillman, A (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. EM Hillmana@anl.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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3992 EP 3994 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203230 ER PT B AU Rust, KR Barnett, WE Cutler, RI Weaver, JT Lambiase, R Sandberg, J Dewan, S Holmes, R Wong, S Zeng, JQ AF Rust, KR Barnett, WE Cutler, RI Weaver, JT Lambiase, R Sandberg, J Dewan, S Holmes, R Wong, S Zeng, JQ GP IEEE TI Installation and testing of SNS magnet power supplies SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This paper describes the types and quantities of do and pulsed magnet power supplies required for the Spallation Neutron Source (SNS) Linear Accelerator: High-Energy Beam Transport (HEBT), Ring and the Ring-to-Target Beam Transfer (RTBT). There are over 600 magnets and more than 550 magnet power supplies. These magnet power supplies range in size from the bipolar corrector supplies rated at 35 volts, 20 amps to the main-ring dipole supply that is rated at 440 volts, 6000 amps. The Linac power supplies have a ripple/stability specification of 1000 parts per million while the ring supplies have a specification of 100 parts per million. There are also pulsed-power supplies for beam injection and beam extraction. The paper will show acceptance test results from the manufacturers as well as test results performed by the SNS magnet power supply group. C1 Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 USA. RP Rust, KR (reprint author), Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 USA. RI Lambiase, Robert/E-1934-2013 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 3998 EP 4000 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203232 ER PT B AU Trakhtenberg, E Collins, J Den Hartog, P White, M AF Trakhtenberg, E Collins, J Den Hartog, P White, M GP IEEE TI Design of a prototype precision positioning system for the undulators of the Linac Coherent Light Source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A precision positioning system has been designed for the Linac Coherent Light Source (LCLS) and a prototype system is being fabricated. The LCLS will use a beam-based alignment technique to precisely align all of the segments of the 131.52-m-long undulator line. The requirement for overlap between the electron beam and the x-ray beam, in order to develop and maintain lasing, demands that each quadrupole must be aligned within a tolerance of +/- 7 mu m and that undulator axes must be positioned within 5 mu m vertically and 10 mu m horizontally. Five cam movers, each with an eccentricity of 1.2 mm, will allow adjustment of a cradle supporting the undulator, its vacuum chamber, a quadrupole, and a beam position monitor. An additional motion transverse to the beam axis allows removal of individual undulators from the beam path. Positioning feedback will be provided by a wire position monitor system and a hydrostatic leveling system. C1 Argonne Natl Lab, APS, Argonne, IL 60439 USA. RP Trakhtenberg, E (reprint author), Argonne Natl Lab, APS, 9700 S Cass Ave, Argonne, IL 60439 USA. EM emil@aps.anl.gov NR 0 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4013 EP 4015 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203237 ER PT B AU Wang, H Liu, W Gai, W Kim, KJ AF Wang, H Liu, W Gai, W Kim, KJ GP IEEE TI Positron emulator for commisioning ILC positron source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The gamma-ray based positron source [1] is an attractive option for the International Linear Collider (ILC) positron option because of the less stringent target requirement and the possibility to provide polarization. The drawback is the fact that the positron accelerator system including positron linac and damping ring can not be fully commissioned until the electron accelerator system is commissioned at high energies (> 150 GeV). In this paper, we discuss a scheme that would use a low energy (similar to 100 MeV) electron beam scattered through a set of carefully selected targets to mimic phase space distribution of the positron beam. The positron '' emulator '' can be used to effectively commission the positron accelerator system including the capture optics, the linac, and even the damping ring before the ILC colliding electron beam is ready. Simulation results using EGS4 for beam scattering and PARMELA for beam dynamics are presented. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Wang, H (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4084 EP 4086 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203261 ER PT B AU Wang, SH AF Wang, SH GP IEEE TI Emittance compensation in flat beam production in an RF gun linac SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Fermilab/NICADD Photoinjector Laboratory has performed a lot of experiments on flat beam production with Ya. Derbenev proposed skew quadrupole channel method [1]. A ratio of 50 of the transverse emittances in X and Y planes has been achieved. In both experiments and simulations with PARMELA [2], the resulted flat beam shows an S-shaped distribution in X-Y space. The sources of the S distribution has been investigated in this paper. A compensation method was suggested to straighten the S distribution and improve the emittance ratio. With this method, an extra solenoid located before the superconducting cavity is added to adjust the beam transverse size when the beam passes through the cavity. PARMELA simulations have shown that, with proper setup of this extra solenoid, the emittance ratio can be enhanced by a factor of about 1.6 and the S-shaped transverse distribution can also be greatly removed. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Wang, SH (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM wangshaoheng@anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4087 EP 4089 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203262 ER PT B AU Yusof, Z Conde, M Gai, W AF Yusof, Z Conde, M Gai, W GP IEEE TI Determination of the field enhancement factor on photocathode surface via the Schottky effect SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Using photon energy that is less than the work function, we employ the Schotty effect to determine the field-enhancement factor on the surface of a Mg photocathode. The Schottky effect is manifested via a shift in the threshold for photoemission as the amplitude of the RF in the photoinjector gun is varied. From the threshold condition, we can directly determine the field enhancement factor on the cathode surface.. This is a viable technique to obtain the field enhancement factor of surfaces of other materials such as Nb and Cu. C1 Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. RP Yusof, Z (reprint author), Argonne Natl Lab, Div High Energy Phys, 9700 S Cass Ave, Argonne, IL 60439 USA. EM zyusof@anl.gov NR 5 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4090 EP 4092 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203263 ER PT B AU Kayran, D Litvinenko, VN AF Kayran, D Litvinenko, VN GP IEEE TI Novel method of emittance preservation in ERL merging system in presence of strong space charge forces SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Energy recovery linacs (ERLs) are potential candidates for the high power and high brightness electron beams sources. The main advantages of ERL are that electron beam is generated at relatively low energy, injected and accelerated to the operational energy in a linac, and after the use is decelerated in the same linac down to injection energy, and, finally, dumped. A merging system, i.e. a system merging together high energy and low energy beams, is an intrinsic part of any ERL loop. One of the challenges for generating high charge, high brightness electron beams in an ERL is development of a merging system, which provides achromatic condition for space charge dominated beam and which is compatible with the emittance compensation scheme. In this paper we present principles of operation of such merging systems. We also describe an example of such system, which we call a Zigzag or a Z-system. We use a specific implementation of the Z-system for R&D ERL at Brookhaven as the illustration. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kayran, D (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM dkayran@bnl.gov RI Kayran, Dmitry/E-1876-2013 OI Kayran, Dmitry/0000-0002-1156-4384 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4093 EP 4095 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203264 ER PT B AU Rao, T Ben-Zvi, I Burrill, A Hahn, H Kayran, D Zhao, Y Kneisel, P Cole, M AF Rao, T Ben-Zvi, I Burrill, A Hahn, H Kayran, D Zhao, Y Kneisel, P Cole, M GP IEEE TI Photoemission studies on BNL/AES/JLAB all niobium, superconducting RF injector SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Photoelectrons from an all niobium superconducting injector have been generated for the first time. QE of 2x10(-6) at 266 nm and 2x10(-5) at 248 nm, maximum charge of 10 nC in 10 ns and charge/cycle of 0.8 nC were measured. The lower QE observed after laser cleaning, compared to the room temperature measurements, is attributed to the long distance between the cathode and the closest ion pump and the possibility of the laser ablated material adsorbed back onto the cathode surface at cryogenic temperature. No cavity quenching has been observed even at the maximum laser energy of 3 mJ, maximum repetition rate of 250 Hz and maximum charge of 10 nC from the cathode. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Rao, T (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. RI Kayran, Dmitry/E-1876-2013 OI Kayran, Dmitry/0000-0002-1156-4384 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4096 EP 4098 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203265 ER PT B AU Smedley, J Rao, T Sekutowicz, J Kneisel, P Langner, J Strzyzewski, P Lefferts, R Lipski, A AF Smedley, J Rao, T Sekutowicz, J Kneisel, P Langner, J Strzyzewski, P Lefferts, R Lipski, A GP IEEE TI Progress on lead photocathodes for superconducting injectors SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB We present the results of our investigation of bulk lead, along with various types of lead films, as suitable photocathode materials for superconducting RF injectors. The quantum efficiency of each sample is presented as a function of the photon energy of the incident light, from 3.9 eV to 6.5 eV. Quantum efficiencies of 0.5% have been obtained. Production of a niobium cavity with a lead-plated cathode is underway. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Smedley, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4099 EP 4101 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203266 ER PT B AU Fliller, RP Edwards, H Hartung, W AF Fliller, RP Edwards, H Hartung, W GP IEEE TI Time dependant quantum efficiency and dark current measurements in an RF photocathode injector with a high quantum efficiency cathode SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Studies of photo-emission and field emission behavior in an RF gun have been carried out. Unexpected phenomena were observed. In situ changes in the cathode's quantum efficiency and dark current with time were seen during operation of the photo-injector. These changes were correlated with the magnetostatic field at the cathode. In addition, multipacting has been observed under certain conditions. Recent measurements indicate a correlation between multipacting and anomalous photo- and field emission behavior. C1 Fermilab Astrophys Ctr, Batavia, IL 60510 USA. RP Fliller, RP (reprint author), Fermilab Astrophys Ctr, Batavia, IL 60510 USA. EM fliller@fnal.gov NR 10 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4102 EP 4104 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203267 ER PT B AU Fliller, RP Anderson, T Edwards, H Bluem, H Schultheiss, T Sinclair, C Huening, M AF Fliller, RP Anderson, T Edwards, H Bluem, H Schultheiss, T Sinclair, C Huening, M GP IEEE TI Progress on using nea cathodes in an RF gun SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB RF guns have proven useful in multiple accelerator applications, and are an attractive electron source for the ILC. Using a NEA GaAs photocathode in such a gun allows for the production of polarized electron beams. However the lifetime of a NEA cathode in this environment is reduced by ion and electron bombardment and residual gas oxidation. We report progress made with studies to produce a RF gun using a NEA GaAs photocathode to produce polarized electron beams. We discuss simulations of ion back bombardment and attempts to reduce the residual gas pressure in the gun are discussed. Future directions are also discussed. C1 Fermilab Astrophys Ctr, Batavia, IL 60510 USA. RP Fliller, RP (reprint author), Fermilab Astrophys Ctr, Batavia, IL 60510 USA. EM fliller@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4105 EP 4107 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203268 ER PT B AU Li, JL Tikoplav, R Piot, P AF Li, JL Tikoplav, R Piot, P GP IEEE TI Production of transverse controllable laser density distribution in Fermilab/NICADD photoinjector SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Fermilab/NICADD photoinjector laboratory consists of a photoemission electron source based on an L band rf-gun. The CsTe photocathode is illuminated by an ultra-short UV laser. The transport line from the laser to the photocathode was recently upgraded to allow imaging of an object plane located similar to 20 in from the photocathode. This upgrade allows the generation of transverse laser distributions with controllable non-uniformity, yielding the production of an electron beam with various transverse densities patterns. Measuring the evolution of the artificial pattern on the electron bunch provides information that can be used to benchmark numerical simulations and investigate the impact of space charge. Preliminary data on these investigations are presented in the present paper. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Li, JL (reprint author), Fermilab Natl Accelerator Lab, MS 306,POB 500, Batavia, IL 60510 USA. EM jianlian@fnal.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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4108 EP 4110 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203269 ER PT B AU Grames, J Adderley, P Brittian, J Charles, D Clark, J Hansknecht, J Poelker, M Stutzman, M Surles-Law, K AF Grames, J Adderley, P Brittian, J Charles, D Clark, J Hansknecht, J Poelker, M Stutzman, M Surles-Law, K GP IEEE TI Ion back-bombardment of GaAs photocathodes inside DC high voltage electron guns SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB DC high voltage GaAs photoguns are key components at accelerator facilities worldwide. New experiments and new accelerator facilities demand improved performance from these guns, in particular higher current operation and longer photocathode operating lifetime. This conference submission explores bulk GaAs photocathode lifetime as a function of beam current, active photocathode area, laser spot size and the vacuum of the gun and beam line. Lifetime measurements were made at 100 A, a beam current relevant for accelerators like CEBAF, and at beam currents of 1 mA and 5 mA, a regime that is interesting for high current Free Electron Laser (FEL) and Energy Recovery Linac (ERL) operation. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Grames, J (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. EM grames@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4114 EP 4116 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203271 ER PT B AU Kazimi, R Benesch, JF Chao, Y Grames, JM Krafft, GA Tiefenback, M Yunn, BC Zhang, Y AF Kazimi, R Benesch, JF Chao, Y Grames, JM Krafft, GA Tiefenback, M Yunn, BC Zhang, Y GP IEEE TI Injection options for 12 GeVCEBAF upgrade SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Jefferson Lab is planning a major upgrade of CEBAF accelerator from 6 to 12 GeV. The injection energy needs to be increased accordingly from 67 MeV to 123 MeV. While the present 100 keV electron gun and beam formation up to 5 MeV would remain unchanged, the accelerating SRF modules in the current injector cannot provide the desired energy increase. Two options for attaining the energy increase have been considered: (1) replacing the present injector SRF modules with new, higher gradient modules, or (2) re-circulating the electron beam through the existing cryomodules to achieve the necessary energy gain in two passes. In this paper we present computer simulation studies for these two options of the injector upgrade and list their advantages and disadvantages. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Kazimi, R (reprint author), Jefferson Lab, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4117 EP 4119 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203272 ER PT B AU Kneisel, P Sekutowicz, J Lefferts, R Lipski, A AF Kneisel, P Sekutowicz, J Lefferts, R Lipski, A GP IEEE TI Preliminary results from a superconducting photocathode sample cavity SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Pure niobium has been proposed as a photocathode material to extract directly photo-currents from the surface of a RF-gun cavity [1]. However, the quantum efficiency of niobium is similar to 3(.)10(-4), whereas electro- or vacuum deposited lead has a similar to 10 times higher quantum efficiency. We have designed and tested a photo-injector niobium cavity, which can be used to insert photocathodes made of different materials in the high electric field region of the cavity. Experiments have been conducted with niobium and lead, which show that neither the Q- values of the cavity nor the obtainable surface fields are significantly lowered. This paper reports about the results from these tests. C1 TJNAF, Newport News, VA 23606 USA. RP Kneisel, P (reprint author), TJNAF, Newport News, VA 23606 USA. EM Kneisel@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4120 EP 4122 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203273 ER PT B AU Rimmer, RA AF Rimmer, RA GP IEEE TI A high-gradient CW RF photo-cathode electron gun for high current injectors SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The paper describes the analysis and preliminary design of a high-gradient photo-cathode RF gun optimized for high current CW operation. The gun cell shape is optimized to provide maximum acceleration for the newly emitted beam while minimizing wall losses in the structure. The design is intended for use in future high-current high-power CW FELs but the shape optimization for low wall losses may be advantageous for other applications such as XFELs or Linear Colliders using high peak power low duty factor guns where pulse heating is a limitation. The concept allows for DC bias on the photocathode in order to repel ions and improve cathode lifetime. C1 JLab, Newport News, VA 23606 USA. RP Rimmer, RA (reprint author), JLab, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4123 EP 4125 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203274 ER PT B AU Hernandez-Garcia, C Siggins, T Benson, S Bullard, D Dylla, HF Jordan, K Murray, C Neil, GR Shinn, M Walker, R AF Hernandez-Garcia, C Siggins, T Benson, S Bullard, D Dylla, HF Jordan, K Murray, C Neil, GR Shinn, M Walker, R GP IEEE TI A high average current DC GaAs photocathode gun for ERLs and FELs SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Jefferson Lab (JLab) 10 kW IR Upgrade FEL DC GaAs photocathode gun is presently the highest average current electron source operational in the U.S., delivering a record 9.1 mA CW, 350 kV electron beam with 122 pC/bunch at 75 MHz rep rate. Pulsed operation has also been demonstrated with 8 mA per pulse (110 pC/bunch) in 16 ms-long pulses at 2 Hz rep rate. Routinely the gun delivers 5 mA CW and pulse current at 135 pC/bunch for FEL operations. The Upgrade DC photocathode gun is a direct evolution of the DC photocathode gun used in the previous JLab 1 kW IR Demo FEL. Improvements in the vacuum conditions, incorporation of two UHV motion mechanisms (a retractable cathode and a photocathode shield door) and a new way to add cesium to the GaAs photocathode surface have extended its lifetime to over 500 Coulombs delivered between re-cesiations (quantum efficiency replenishment). With each photocathode activation quantum efficiencies above 6% are routinely achieved. The photocathode activation and performance will be described in detail. C1 TJNAF, Newport News, VA 23606 USA. RP Hernandez-Garcia, C (reprint author), TJNAF, Newport News, VA 23606 USA. EM chgarcia@jlab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4126 EP 4128 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203275 ER PT B AU Qiang, J Lidia, S Ryne, R Limborg, C AF Qiang, J Lidia, S Ryne, R Limborg, C GP IEEE TI A 3D parallel beam dynamics code for modeling high brightness beams in photoinjectors SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID RF AB In this paper we report on IMPACT T, a 3D beam dynamics code for modeling high brightness beams in photoinjectors and rf linacs. IMPACT-T is one of the few codes used in the photoinjector community that has a parallel implementation, making it very useful for high statistics simulations of beam halos and beam diagnostics. It has a comprehensive set of beamline elements, and furthermore allows arbitrary overlap of their fields. It is unique in its use of space-charge solvers based on an integrated Green function to efficiently and accurately treat beams with large aspect ratio, and a shifted Green function to efficiently treat image charge effects of a cathode. It is also unique in its inclusion of energy binning in the space-charge calculation to model beams with large energy spread. Together, all these features make IMPACT T a powerful and versatile tool for modeling beams in photoinjectors and other systems. In this paper we describe the code features and present results of IMPACT-T simulations of the LCLS photoinjectors. We also include a comparison of IMPACT-T and PARMELA results. C1 LBNL, Berkeley, CA 94547 USA. RP Qiang, J (reprint author), LBNL, Berkeley, CA 94547 USA. EM jqiang@lbl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4129 EP 4131 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203276 ER PT B AU Brachmann, A Clendenin, JE Garwin, E Kirby, R Luh, DA Maruyama, T Schultz, D Sheppard, J Prepost, R AF Brachmann, A Clendenin, JE Garwin, E Kirby, R Luh, DA Maruyama, T Schultz, D Sheppard, J Prepost, R GP IEEE TI The ILC polarized electron source SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE ID PHOTOCATHODES; SUPERLATTICE; EMISSION; GUN AB The SLC polarized electron source (PES) cart meet the expected requirements of the International Linear Collider (ILC) for polarization, charge and lifetime. However, experience with newer and successful PES designs at JLAB, Mainz, Nagoya and elsewhere can be incorporated into a first-generation ILC source that will emphasize reliability and stability without compromising the photocathode performance. The long pulse train for the ILC may introduce new challenges for the PES, and in addition more reliable and stable operation of the PES may be achievable if appropriate R&D is carried out for higher voltage operation and for a suppler load-lock system. The outline of the R&D program currently taking shape at SLAG and elsewhere is discussed. The principal components of the proposed ILC PES, including the laser system necessary for operational tests, are described. C1 SLAC, Menlo Pk, CA 94025 USA. RP Brachmann, A (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM brachman@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4135 EP 4137 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203278 ER PT B AU Norem, J Sandstrom, R Bross, A Moretti, A Qian, Z Torun, Y Rimmer, R Li, D Zisman, M Johnson, R AF Norem, J Sandstrom, R Bross, A Moretti, A Qian, Z Torun, Y Rimmer, R Li, D Zisman, M Johnson, R GP IEEE TI The RF experimental program in the Fermilab MUCOOL Test Area SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The rf R&D program for high gradient, low frequency cavities to be used in muon cooling systems is underway in the Fermilab MUCOOL Test Area. Cavities at 805 and 201 MHz are used for tests of conditioning techniques, surface modification and breakdown studies. This work has the Muon Ionization Cooling Experiment (MICE) as its immediate goal and efficient muon cooling systems for neutrino sources and muon colliders as the long term goal. We study breakdown, and dark current production under a variety of conditions. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Norem, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM norem@anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4211 EP 4213 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203304 ER PT B AU Sharamentov, S Bogaty, J Clifft, BE Pardo, R AF Sharamentov, S Bogaty, J Clifft, BE Pardo, R GP IEEE TI Upgrade of the ATLAS Positive Ion Injector bunching system SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Over the last few years, significant efforts were concentrated on improving the ATLAS Positive Ion Injector (PII) RF bunching system, consisting of a four-harmonic pre-buncher, Traveling Wave Chopper (TWC) and a single-frequency sinusoidal re-buncher. The primary goal was to improve RF field stability with a redesigned RF system and to improve buncher performance for higher current beams resulting in better bunch stability and time structure at the first PII superconducting resonator. The major parts of the system were redesigned and rebuilt, including 12-48 MHz RF power amplifiers for the harmonic pre-buncher and re-buncher, RF driver rack for the TWC, and the RF control chassis for both the pre-buncher and re-buncher. The four-harmonic resonant structure of the harmonic buncher itself was modified, too, mainly for better mechanical stability and better RF matching. These improvements will be described and the performance of the new system presented. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Sharamentov, S (reprint author), Argonne Natl Lab, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4214 EP 4216 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203305 ER PT B AU Wissmann, M Hovater, C Guerra, A Plawski, T AF Wissmann, M Hovater, C Guerra, A Plawski, T GP IEEE TI The CEBAF separator cavity resonance control system SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The CEBAF energy upgrade will increase the maximum beam energy from 6 GeV to 12 GeV available to the experimental halls. RF deflection cavities (separators) are used to direct the electron beam to the three halls. The resulting increase in RF separator cavity gradient and subsequent increase in RF power needed for these higher energies will require the cavities to have active resonance control. Currently, at the present 4 to 6 GeV energies, the cavities are tuned mechanically and then stabilized with Low Conductivity Water (LCW) which is maintained at a constant temperature of 95 Fahrenheit. This approach is no longer feasible and an active resonance control system that controls both water temperature and flow has been designed and built. The system uses a commercial PLC with embedded PID controls to regulate water temperature and flow to the cavities. The system allows the operator to remotely adjust temperature/flow and consequently cavity resonance for the full range of beam energies. Ultimately, closed loop control will be maintained by monitoring each cavity's reflected power. This paper describes this system. C1 TJNAF, Newport News, VA 23606 USA. RP Wissmann, M (reprint author), TJNAF, Newport News, VA 23606 USA. EM wissmann@jlaab.org 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4223 EP 4225 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203308 ER PT B AU Lynch, M Bolme, J Tallerico, P AF Lynch, M Bolme, J Tallerico, P GP IEEE TI The LANSCE 805 MHz RF system history and status SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Los Alamos Neutron Science Center (LANSCE) linear accelerator runs at 201.25 MHz for acceleration to 100 MeV. The remainder of the acceleration to 800 MeV is at 805 MHz. This is done with 44 accelerator cavity stages driven by 805 MHz klystrons. Each klystron has a peak power capability of 1.25 McV. Originally, 98 klystrons were purchased, which was 70 from Varian/CPI and 28 from Litton. The 44 RF systems are laid out in sectors with either 6 or 7 klystrons per sector. The klystrons in each sector are powered from a common HV system. The current arrangement uses the Varian/CPI klystrons in 6 of the 7 sectors and Litton klystrons in the remaining sector. With that arrangement there are 38 CPI klystrons installed and 1 spare klystron per sector and 6 Litton klystrons installed in the final sector with 2 spares. The current average life of all of the operating and spare klystrons (52 total) is > 112,000 filament hours and > 93,000 HV hours. That is three times the typical klystron lifetime today for other similar klystrons. This paper summarizes the details of the LANSCE klystron history and status and a summary of the predicted failure rate. C1 Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Lynch, M (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4226 EP 4228 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203309 ER PT B AU Roybal, WT Reass, WA Nguyen, DC Rees, DE Torrez, PA Tallerico, PJ AF Roybal, WT Reass, WA Nguyen, DC Rees, DE Torrez, PA Tallerico, PJ GP IEEE TI A 700 MHz, 1 MW CW RF system for a FEL 100 MA RF photoinjector SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB This paper describes a 700 MHz, 1 Megawatt continuous wave (CW), high efficiency klystron RF system utilized for a Free Electron Laser (FEL) highbrightness electron photoinjector (PI) [1,2]. The E2V klystron is a mod-anode tube that operates with a beam voltage of 95 kV This klystron, operating with a 66% efficiency, requires similar to 96 watts of input power to produce 1007 kW output. This output drives the 3(rd) cell of a 2 cell, pi-mode cavity. Coupling is via a ridge-loaded tapered waveguide section and "dog-bone" iris. This paper will present the design of the RF, RF transport, coupling, and monitoring/protection systems that are required to support CW operations of the 100 mA cesiated, semi-porous SiC photoinjector. C1 Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Roybal, WT (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4229 EP 4231 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203310 ER PT B AU Rees, D Bolme, G Bradley, J Kwon, S Lyles, J Lynch, M Prokop, M Reass, W Tallerico, P AF Rees, D Bolme, G Bradley, J Kwon, S Lyles, J Lynch, M Prokop, M Reass, W Tallerico, P GP IEEE TI LANSCE RF system refurbishment SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Los Alamos Neutron Science Center (LANSCE) is in the planning phase of a refurbishment project that will sustain reliable facility operations well into the next decade. The linear accelerator was constructed in the late 1960s and commissioned as the Los Alamos Meson Physics Facility (LAMPF) in 1972. As the mission changed, LANSCE became a national user facility that provides pulsed protons and spallation neutrons for defense and civilian research and applications. The upgrade will replace all of the 201.25 MHz RF systems and a substantial fraction of the 805 MHz RF systems and high voltage systems. This paper will provide the design details of the new RF and high voltage systems. C1 LANL, Los Alamos, NM 87544 USA. RP Rees, D (reprint author), LANL, Los Alamos, NM 87544 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4232 EP 4234 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203311 ER PT B AU Fox, J Mastorides, T Teytelman, D Van Winkle, D Zhou, Y Gallo, A AF Fox, J Mastorides, T Teytelman, D Van Winkle, D Zhou, Y Gallo, A GP IEEE TI Klystron linearizer for use with 1.2 MW 476 MHz klystrons in PEP-II RF systems SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The direct and comb loop feedback around the RF cavities in PEP-II is critical in reducing longitudinal instabilities driven by the cavity impedance. The non-linear 1.2 MW klystron is in the signal path for these feedback loops. As a result, the effective small-signal gain of the klystron at 85% saturation reduces the impedance control by factors of 5 to 20 as compared to a linear power amplifier. A klystron linearizer circuit has been developed which operates in series with the power amplifier and acts to equalize the small and large signal gains through the combination. The technique must implement a 1 MHz linear control bandwidth over roughly 15 dB of RF signal level variation. The dynamics of this system is operating point dependent, and the channel must have dynamic gain compensation to keep the linearity compensation loop stable over changes in operating point. The design of this non-linear signal processing channel (incorporating RF and DSP techniques) and measured results from full-power klystron testing are presented. C1 Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Fox, J (reprint author), Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. EM jdfox@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4244 EP 4246 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203315 ER PT B AU McIntosh, P Akre, R Boyce, R Emma, P Hill, A Rago, C AF McIntosh, P Akre, R Boyce, R Emma, P Hill, A Rago, C GP IEEE TI Overview of the RF systems for LCLS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Linac Coherent Light Source (LCLS) at SLAC, when it becomes operational in 2009, will provide its user community with an X-ray source many orders of magnitude brighter than anything available in the world at that time [1]. The electron beam acceleration will be provided by existing and new RF systems capable of maintaining the amplitude and phase stability of each bunch to extremely tight tolerances. RF feedback control of the various RF systems will be fundamental in ensuring the beam arrives at the LCLS undulator at precisely the required energy and peak current phase. This paper details the requirements for RF stability for the various LCLS RF systems and also highlights proposals for how these injector and Linac RF systems can meet these tight constraints. C1 SLAC, Menlo Pk, CA 94025 USA. RP McIntosh, P (reprint author), SLAC, 2527 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4247 EP 4249 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203316 ER PT B AU McIntosh, P Akre, R Brooks, W Emma, P Rago, C AF McIntosh, P Akre, R Brooks, W Emma, P Rago, C GP IEEE TI Realization of an X-band RF system for LCLS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A single X-band (11.424 GHz) accelerating structure is to be incorporated in the LINAC Coherent Light Source (LCLS) design to linearize the energy-time correlation (or gradient) across each bunch; features which originate in the preceding accelerating structures (L0 and L1) [1]. This harmonic RF system will operate near the negative RF crest to decelerate the beam, reducing these non-linear components of the correlation, providing a more efficient compression in the downstream bunch compressor chicanes (BC1 and BC2). These non-linear correlation components, if allowed to grow, would lead to Coherent Synchrotron Radiation (CSR) instabilities in the chicanes, effectively destroying the coherence of the photon radiation in the main LCLS undulator. The many years devoted at SLAC in the development of X-band RF components for the NLC/JLC linear collider project [2], has enabled the technical and financial realization of such an RE system for LCLS. This paper details the requirements for the X-band system and the proposed scheme planned for achieving those requirements. C1 SLAC, Menlo Pk, CA 94025 USA. RP McIntosh, P (reprint author), SLAC, 2575 Sand Hill Rd, Menlo Pk, CA 94025 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4250 EP 4252 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203317 ER PT B AU Teytelman, D AF Teytelman, D GP IEEE TI A non-invasive technique for configuring low level RF feedback loops in PEP-II SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The RF system of the PEP-II collider uses two fast feedback loops around each klystron and set of cavities. These loops reduce the impedance of the fundamental mode of the accelerating cavities seen by the beam, and are necessary to reduce the growth rates of longitudinal modes within the RF system bandwidth. Operation of the accelerator at high beam currents is very sensitive to the configuration of the low-level RF feedback loops. There are 7 loop control parameters that strongly influence the stability of the feedback loops and the achieved level of longitudinal impedance reduction. Diagnostic techniques for the analysis of the RF feedback via closed-loop system transfer function measurements will be presented. The model is fit to the measured closed-loop transfer function data and the extracted parameters are then used to calculate optimal tuning and corrections to the loop control elements in the physical channel. These techniques allow fine-tuning of RF feedback with stored beam as well as diagnosis of misconfigured or malfunctioning elements of the system. Results from PEP-II operation will be presented to illustrate the techniques and their applications. C1 SLAC, Menlo Pk, CA 94025 USA. RP Teytelman, D (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM dim@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4253 EP 4255 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203318 ER PT B AU Zhao, YX Ben-Zvi, I Chang, XY Rao, TV Chen, W Di Nardo, R Beuttenmuller, R AF Zhao, YX Ben-Zvi, I Chang, XY Rao, TV Chen, W Di Nardo, R Beuttenmuller, R GP IEEE TI The penetrability of a thin metallic film inside the RF field SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Thin metallic film was widely applied in various areas. Especially, recently we are planning to apply it in a "Secondary emission enhanced photo-injector", in which a diamond cathode is coated with a metallic film on its back to serve as a current path. The thickness of the film is originally considered to be in the order of 10 rim, which is much less than the skin depth, by a factor of almost 200. One would think intuitively that the RF filed would penetrate such a thin film. However, we found it is not true. The film will block most of the field. This paper addresses theoretical analysis as well as the experimental results, and demonstrates that the penetrability of a thin film is very poor. Consequently, most of the RF current will flow on the thin film causing a serious heating problem. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Zhao, YX (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4262 EP 4264 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203321 ER PT B AU Foster, B Gonin, I Khabiboulline, T Makarov, A Solyak, N Terechkine, I Wildman, D AF Foster, B Gonin, I Khabiboulline, T Makarov, A Solyak, N Terechkine, I Wildman, D GP IEEE TI High power phase shifter SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB One of the approaches to power distribution system of a superconducting proton linac that is under discussion at Fermilab requires development of a fast-action, megawatt-range phase shifter. Using two phase shifters with a waveguide hybrid junction can allow independent control of phase and amplitude of RF power at the input of each superconducting cavity of the linac. This promises significant saving in number of klystrons and modulators required for the accelerator. A prototype of a waveguide version of a phase shifter that uses Yttrium-Iron Garnet (YIG) blocks was developed and tested. This report presents design concept of the device and main results of simulation and proof-of-principle tests. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Foster, B (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM terechki@fnal.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4265 EP 4267 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203322 ER PT B AU Young, K Bradley, J Hardek, T Lynch, M Rees, D Roybal, W Tallerico, P Torrez, P AF Young, K Bradley, J Hardek, T Lynch, M Rees, D Roybal, W Tallerico, P Torrez, P GP IEEE TI 5 MW 805 MHz SNS RF system experience SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The RF system for the 805 MHz normal conducting linac of the Spallation Neutron Source (SNS) accelerator was designed, procured and tested at Los Alamos National Laboratory (LANL), and then installed and commissioned at Oak Ridge National Laboratory (ORNL). The RF power for the room temperature coupled cavity linac (CCL) of the SNS accelerator is generated by four, pulsed 5 MW peak-power klystrons operating with a pulse width of 1.25 ms and a 60 Hz repetition frequency. The RF power from each klystron is divided and delivered to the CCL through two separate RF windows. The 5 MW RF system advanced the state of the art for simultaneous peak and average power. This paper summarizes the problems encountered, lessons learned, and results of the high power testing at LANL of the 5 MW klystrons, 5 MW circulators, 5 MW loads, and 2.5 MW windows. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Young, K (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4277 EP 4279 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203326 ER PT B AU Anderson, DE Hicks, J Hurst, D Tapp, E Wezensky, M Baca, D Reass, W Peplov, VV AF Anderson, DE Hicks, J Hurst, D Tapp, E Wezensky, M Baca, D Reass, W Peplov, VV GP IEEE TI Enhancements for the 1 MW high voltage converter modulator systems at the SNS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The first-generation high frequency switching megawatt-class High Voltage Converter Modulators (HVCM) developed by Los Alamos National Laboratory for the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory have been installed and are now operational. Each unit is capable of delivering pulses up to 11 MW peak, 1 MW average power at voltages up to 140 kV to drive klystron(s) rated up to 5 MW. To date, three variations of the basic design have been installed, each optimized to deliver power to a specific klystron load configuration. Design improvements, with the primary intention of improving system reliability and availability, have been under development since the initial installation of the HVCM units. This paper will examine HVCM reliability studies, reliability operational data, and modifications and improvements performed to increase the overall system availability. We will also discuss system enhancements aimed at improving the ease of operation and providing for additional equipment protection features. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Anderson, DE (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4280 EP 4282 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203327 ER PT B AU Champion, M Crofford, M Kasemir, K Ma, H Piller, M Doolittle, L Ratti, A AF Champion, M Crofford, M Kasemir, K Ma, H Piller, M Doolittle, L Ratti, A GP IEEE TI Overview of the spallation neutron source linac low-level RF control system SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The design and production of the Spallation Neutron Source Linac Low-Level RF control system is complete, and installation will be finished in Spring 2005. The warm linac beam commissioning run in Fall 2004 was the most extensive test to date of the LLRF control system, with fourteen (of an eventual 96) systems operating simultaneously. In this paper we present an overview of the LLRF control system, the experience in designing, building and installing the system, and operational results. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Champion, M (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4283 EP 4285 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203328 ER PT B AU Crofford, M Champion, M Kasemir, KU Ma, HJ Piller, M AF Crofford, M Champion, M Kasemir, KU Ma, HJ Piller, M GP IEEE TI Operational experience with the spallation neutron source high power protection module SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source (SNS) High Power Protection Module provides protection for the High Power RF Klystron and Distribution System and interfaces with the Low-Level Radio-Frequency (LLRF) Field Control Module (FCM). The fault detection logic is implemented in a single FPGA allowing modifications and upgrades to the logic as we gain operational experience with the RF LINAC systems. This paper describes the integration and upgrade issues we have encountered during the initial operations of the SNS systems. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Crofford, M (reprint author), Oak Ridge Natl Lab, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4286 EP 4288 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203329 ER PT B AU Kang, Y Anderson, D Campisi, IE Champion, MS Crofford, M Fuja, R Gurd, P Hasan, SMS Kasemir, K McCarthy, M Stout, D Tang, J Vassioutchenko, A Wezensky, M Davis, GK Drury, M Powers, T Stirbet, M AF Kang, Y Anderson, D Campisi, IE Champion, MS Crofford, M Fuja, R Gurd, P Hasan, SMS Kasemir, K McCarthy, M Stout, D Tang, J Vassioutchenko, A Wezensky, M Davis, GK Drury, M Powers, T Stirbet, M GP IEEE TI High power RF test facility at the SNS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB RF Test Facility (RFTF) has been constructed to support present and future needs in testing, processing and conditioning of various high power RF components of normal conducting and superconducting systems at the SNS. The facility is expected to have additional subsystems that are needed for complete superconducting RF (SRF) testing and processing. A full capacity high voltage converter modulator (HVCM) with 11 MW peak power at 8% duty cycle has been installed for driving one or two klystron RF amplifiers. The waveguides are completed in WR-2100 and WR-1150 for the 402.5 MHz and 805 MHz klystrons being used in the SNS. The 805 MHz system has been used for RF processing the coaxial fundamental power couplers (FPCs) for the SNS superconducting linac (SCL) [1]. The high power RF system can be reconfigured or modified for various tests and conditioning processes along with the neighboring cryo-plant. C1 Oak Ridge Natl Lab, SNS Project, Oak Ridge, TN 37831 USA. RP Kang, Y (reprint author), Oak Ridge Natl Lab, SNS Project, Oak Ridge, TN 37831 USA. NR 4 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4289 EP 4291 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203330 ER PT B AU Ma, HJ Champion, M Crofford, M Kasemir, KU Piller, M Doolittle, L Rotti, A AF Ma, HJ Champion, M Crofford, M Kasemir, KU Piller, M Doolittle, L Rotti, A GP IEEE TI SNS low-level RF control system: Design and performance SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A full digital RF field control module (FCM) has been developed for SNS LINAC. The digital hardware for all the control and DSP functionalities, including the final vector modulation as well as IF output synthesis, is implemented on a single high-density FPGA. Two of its HDL models leave been written in VHDL and Verilog respectively, acid both have being used to support the testing and commissioning of the LINAC to the date. The control algorithm used in the HDL produces a latency as low as 150nS. During the commissioning, the flexibility and capacity for needed precise controls that only digital design can provide has proved to be a necessity for meeting the great challenge of a high-power pulsed SCL. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Ma, HJ (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4292 EP 4294 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203331 ER PT B AU McCarthy, M Anderson, D Fuja, R Gurd, P Hardek, T Kang, Y Bradley, J Young, K Rees, D Roybal, W AF McCarthy, M Anderson, D Fuja, R Gurd, P Hardek, T Kang, Y Bradley, J Young, K Rees, D Roybal, W GP IEEE TI Spallation neutron source high power RF installation and commissioning progress SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source (SNS) linac will provide a 1 GeV proton beam for injection into the accumulator ring. In the normal conducting (NC) section of this linac, the Radio Frequency Quadupole (RFQ) and six drift tube linac (DTL) tanks are powered by seven 2.5 MW, 402.5 MHz klystrons and the four coupled cavity linac (CCL) cavities are powered by four 5.0 MW, 805 MHz klystrons. Eighty-one 550 kW, 805 MHz klystrons each drive a single cavity in the superconducting (SC) section of the linac. The high power radio frequency (HPRF) equipment was specified and procured by LANL and tested before delivery to ensure a smooth transition from installation to commissioning. Installation of RF equipment to support klystron operation in the 350-meter long klystron gallery started in June 2002. The final klystron was set in place in September 2004. Presently, all RF stations have been installed and high power testing has been completed. This paper reviews the progression of the installation and testing of the HPRF Systems. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP McCarthy, M (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4295 EP 4297 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203332 ER PT B AU Piller, M Champion, M Crofford, M Ma, H Doolittle, L AF Piller, M Champion, M Crofford, M Ma, H Doolittle, L GP IEEE TI The spallation neutron source RF reference system SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source (SNS) RF Reference System includes the master oscillator (MO), local oscillator(LO) distribution, and Reference RF distribution systems. Coherent low noise Reference RF signals provide the ability to control the phase relationships between the fields in the front-end and linear accelerator (linac) RF cavity structures. The SNS RF Reference System requirements, implementation details, and performance are discussed. C1 Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 USA. RP Piller, M (reprint author), Oak Ridge Natl Lab, SNS, 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4298 EP 4300 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203333 ER PT B AU Deibele, C Pogge, J Webster, A Power, J AF Deibele, C Pogge, J Webster, A Power, J GP IEEE TI Design and status of the BPM RF reference distribution in the SNS SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source (SNS) is an accelerator-based neutron source being built at Oak Ridge National Laboratory. The BPMs (Beam Position Monitors) requires RF reference signals to measure the phase of the beam with respect to the RE In the MEBT (Medium Energy Beam Transport) Line and in the DTLs (Drift Tube Linac Cavities) are cavities that accelerate and bunch the beam at 402.5 MHz. In the CCLs (Coupled Cavity Linac) and SCLs (Superconducting Linac) accelerate the beam at 805 MHz. To mitigate effects of RF leakage into the BPM electrodes it is required to measure the phase in the MEBT and DTLs at 805 MHz and in the CCL and SCL at 402.5 MHz. We are directly connected to the RF group MO (master oscillator) and send these signals along the entire linac using fiber optic technology. Schematics, measurements, and installation update are discussed. C1 Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 USA. RP Deibele, C (reprint author), Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4301 EP 4303 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203334 ER PT B AU Kwiatkowski, S Baptiste, K AF Kwiatkowski, S Baptiste, K GP IEEE TI ALS booster ring RF system upgrade for top-off mode of operation SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Advanced Light Source (ALS) is one of the first 3(rd)- generation synchrotron light sources and it has been in operation at the Berkeley Lab since 1993. In the present ALS operation scenario, 1.5GeV electron beam is injected from the booster into the storage ring every 8 hours where it is accelerated to the final energy of 1.9GeV. The beam decays between fills from 400mA to 200mA with the time average current of 250mA. In order to increase beam brightness the ALS team plans to increase the beam current to 500mA and maintain it constant during machine operation ("Top-Off" mode of operation). This operation scenario will require full energy injection from the booster ring into the storage ring and constant operation of the injector (10 bunches with the total charge of 1nC even 30-35 second). In this paper we will present the results of the ALS injector RF system analysis for Top-Off mode of operation and describe the way we intend to implement the necessary modifications to the booster RF system. C1 LBNL, Berkeley, CA 94720 USA. RP Kwiatkowski, S (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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4310 EP 4312 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203337 ER PT B AU Farkas, ZD AF Farkas, ZD GP IEEE TI High power disk loaded guide load SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB A method to design a matching section from a smooth guide to a disk-loaded guide, using a variation of broadband matching, [1, 2] is described. Using this method, we show how to design high power loads. The load consists of a disk-loaded coaxial guide operating in the TE(01)-mode. We use this mode because it has no electric field terminating on a conductor, has no axial currents, and has no current at the cylinder-disk interface. A high power load design that has -35 dB reflection and a 200 MHz, -20 dB bandwidth, is presented. It is expected that it will carry the 600 MW output peak power of the pulse compression network. We use coaxial geometry and stainless steel material to increase the attenuation per cell. C1 SLAC, Stanford, CA 94025 USA. RP Farkas, ZD (reprint author), SLAC, Stanford, CA 94025 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4313 EP 4315 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203338 ER PT B AU Van Winkle, D Fox, J Teytelman, D AF Van Winkle, D Fox, J Teytelman, D GP IEEE TI In depth diagnostics for RF system operation in the PEP-II B factory SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The PEP-II RF systems incorporate numerous feedback loops in the low-level processing for impedance control and operating point regulation. The interaction of the multiple loops with the beam is complicated, and the systems incorporate online diagnostic tools to configure the feedback loops as well as to record fault files in the case of an RF abort. Rapid and consistent analysis of the RF-related beam aborts and other failures is critical to the reliable operation of the B-Factory, especially at the recently achieved high beam currents. Procedures and algorithms used to extract diagnostic information from time domain fault files are presented and illustrated via example interpretations of PEP-II fault file data. Example faults presented will highlight the subtle interpretation required to determine the root cause. Some such examples are: abort kicker firing asynchronously, klystron and cavity arcs, beam loss leading to longitudinal instability, tuner read back jumps and poorly configured low-level RF feedback loop. C1 SLAC, Menlo Pk, CA 94025 USA. RP Van Winkle, D (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM dandvan@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4331 EP 4333 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203344 ER PT B AU Zinkann, GP Sharamentov, S Clifft, B AF Zinkann, GP Sharamentov, S Clifft, B GP IEEE TI An improved pneumatic frequency control for superconducting cavities SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The ATLAS (Argonne Tandem Linear Accelerator System) superconducting cavities use a pneumatic system to maintain the cavity eigenfrequency at the master oscillator frequency [1]. The present pneumatic slow tuner has a limitation in the tuning slew rates. For some resonators, the frequency slew rate is as low as 30 Hz/sec. The total turfing range for ATLAS cavities varies from 60 kHz to as high as 450 kHz depending on the cavity type. With the present system, if a cavity is at the extreme end of its truing range, it may, take an unacceptable length of time to reach the master oscillator frequency. We have designed a new slow tuner system that increases the frequency slew rates by a factor of three hundred. This improved system is directly applicable for use on RIA (Rare Isotope Accelerator) cavities. This paper discusses the design of the system and the results of a prototype test. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Zinkann, GP (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM zinkann@anl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4352 EP 4354 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203351 ER PT B AU Piot, P Dohlus, M Flottmann, K Marx, M Wipf, SG AF Piot, P Dohlus, M Flottmann, K Marx, M Wipf, SG GP IEEE TI Steering and focusing effects in TESLA cavity due to high order mode and input couplers SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Many state-of-art electron accelerator proposals incorporate TESLA-type superconducting radio-frequency (rf) cavities [1]. These standing wave rf cavities include rf input couplers and a pair of high order mode (HOM) couplers to absorb the energy associated to HOM field excited as the bunch passes through the cavity. In the present paper we investigate, using numerical simulations, the impact of the input and HOM couplers on the beam dynamics to zeroth and first order in initial position, and present parametric studies of the strength of these effects for various incoming beam energies. We finally study the impact of this non-asymmetric field on the beam dynamics, taking as an example the low energy section of the X-ray FEL injector. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Piot, P (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4355 EP 4357 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203352 ER PT B AU Campisi, IE Assadi, S Casagrande, F Champion, M Chu, P Cousineau, S Crofford, M Deibele, C Galambos, JD Gurd, P Hatfield, D Howell, M Jeon, D Kang, YW Kasemir, K Kursun, Z Ma, H Piller, M Stout, D Strong, W Vassioutchenko, A Zhang, Y AF Campisi, IE Assadi, S Casagrande, F Champion, M Chu, P Cousineau, S Crofford, M Deibele, C Galambos, JD Gurd, P Hatfield, D Howell, M Jeon, D Kang, YW Kasemir, K Kursun, Z Ma, H Piller, M Stout, D Strong, W Vassioutchenko, A Zhang, Y GP IEEE TI 4.2 K operation of the SNS cryomodules SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB The Spallation Neutron Source being built at Oak Ridge National Laboratory employs eighty one 805 MHz superconducting cavities operated at 2.1 K to accelerate the H(-) beam from 187 MeV to about 1 GeV. The superconducting cavities and cryomodules with two different values of beta (.61 and.81) have been designed and constructed at Jefferson Lab for operation at 2.1 K with unloaded Q's in excess of 5x10(9). To gain experience in testing cryomodules in the SNS tunnel before the final commissioning of the 2.1 K Central Helium Liquefier, integration tests are being conducted on the cryomodules at 4.2 K. This is the first time that a superconducting cavity system specifically designed for 2.1 K operation has been extensively tested at 4.2 K without superfluid helium. C1 ORNL, SNS, Oak Ridge, TN 37831 USA. RP Campisi, IE (reprint author), ORNL, SNS, Oak Ridge, TN 37831 USA. EM cie@ornl.gov 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4361 EP 4363 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203354 ER PT B AU An, S AF An, S GP IEEE TI Superconducting RF cavity frequency and field distribution sensitivity simulation SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Frequency and electromagnetic field distribution sensitivity of a superconducting RF (SRF) cavity are the fundamental phyical paramethers in cavity and tuner design. At low temperature, the frequency sensitivity can be obtained by measuring prototype cavity, but it is not easy to test the filed distribution sensitivity. This paper presents and describes a simulation method combining ANSYS and SUPERFISH to calculate the cavity frequency and field distribution variation due to cavity's small deformation caused by mechanical force, radiation force, thermal expansion etc.. As an example, the simulation results of the frequency and field flatness sensitivity on the SNS cavities were confirmed by their test results. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP An, S (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. EM sun_ancn@yahoo.com 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4364 EP 4366 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203355 ER PT B AU Nantista, C Tantawi, S Weisend, J Siemann, R Dolgashev, V Campisi, I AF Nantista, C Tantawi, S Weisend, J Siemann, R Dolgashev, V Campisi, I GP IEEE TI Test bed for superconducting materials SO 2005 IEEE PARTICLE ACCELERATOR CONFERENCE (PAC), VOLS 1-4 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT 21st Particle Accelerator Conference (PAC) CY MAY 16-20, 2005 CL Knoxville, TN SP IEEE AB Superconducting rf cavities are increasingly used in accelerators. Gradient is a parameter of particular importance for the TLC. Much progress in gradient has been made over the past decade, overcoming problems of multipacting, field emission, and breakdown triggered by surface impurities. However, the quenching limit of the surface magnetic field for niobium remains a hard limitation on cavity fields sustainable with this technology. Further exploration of materials and preparation may offer a path to surpassing the current limit. For this purpose, we have designed a resonant test cavity. One wall of the cavity is formed by a flat sample of superconducting material; the rest of the cavity is copper or niobium. The H field on the sample wall is 75% higher than on any other surface. Multipacting is avoided by use of a mode with no surface electric field. The cavity will be resonated through a coupling iris with high-power rf at superconducting temperature until the sample wall quenches, as detected by a change in the quality factor. This experiment will allow us to measure critical magnetic fields up to well above that of niobium with minimal cost and effort. C1 SLAC, Menlo Pk, CA 94025 USA. RP Nantista, C (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM nantista@slac.stanford.edu 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 0-7803-8859-3 J9 IEEE PART ACC CONF PY 2005 BP 4370 EP 4372 PG 3 WC Instruments & Instrumentation; Physics, Particles & Fields SC Instruments & Instrumentation; Physics GA BDV94 UT WOS:000235745203357 ER PT S AU Muljadi, E Butterfield, CP Conto, J Donohoo, K AF Muljadi, E Butterfield, CP Conto, J Donohoo, K GP IEEE TI Ride-through capability predictions for wind power plants in the ERCOT network SO 2005 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS, 1-3 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 12-16, 2005 CL San Francisco, CA SP IEEE Power Engn Soc DE wind turbine; wind farm; wind energy; aggregation; power system; variable-speed generation; renewable energy; low voltage ride through AB Utility system operators and engineers now want a better understanding of the impacts of large wind farms on grid stability before the farms are interconnected to the grid. Utilities need wind farm electrical models and methods of analysis that will help them analyze potential problems of grid stability. Without the necessary tools and knowledge of the behavior of large wind power plants, utilities are reluctant to integrate more wind power into the grid. The dynamic models used in this paper were developed by Power Technologies Inc. (PTI), under subcontract from ERCOT. A three-phase fault on important buses will be tested, and the impact on wind farms will be investigated. Two methods, dynamic analysis and steady state analysis (Z(bus) prediction), will be used to predict the low voltage ride through capability of the wind farms. Comparison between the two methods will be presented. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Muljadi, E (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 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 SN 1932-5517 BN 0-7803-9156-X J9 IEEE POWER ENG SOC PY 2005 BP 72 EP 79 PG 8 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BDD09 UT WOS:000232799400012 ER PT S AU Lu, N Katipamula, S AF Lu, N Katipamula, S GP IEEE TI Control strategies of thermostatically controlled appliances in a competitive electricity market SO 2005 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS, 1-3 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 12-16, 2005 CL San Francisco, CA SP IEEE Power Engn Soc DE competitive electricity market; demand-side management; demand response; load curtailment; price responsive demand; thermostatically controlled appliances; control strategies ID LOAD SHAPE AB This paper discusses setpoint-control strategies for thermostatically controlled appliances (TCAs) in a competitive electricity market, with the electric water heater load used as an example. By varying the TCA thermostat settings, the TCA power consumption can be shifted from the high-price period to the low-price period to reduce the peak-load and energy cost. Economic benefits and impacts on distribution feeder load shapes when applying different setpoint-control strategies are studied. C1 Pacific NW Natl Lab, Energy Sci & Technol Div, Richland, WA 99352 USA. RP Lu, N (reprint author), Pacific NW Natl Lab, Energy Sci & Technol Div, POB 999,MSIN K5-20, Richland, WA 99352 USA. EM ning.lu@pnl.gov; srinivas.katipamula@pnl.gov NR 13 TC 19 Z9 19 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1932-5517 BN 0-7803-9156-X J9 IEEE POWER ENG SOC PY 2005 BP 202 EP 207 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BDD09 UT WOS:000232799400031 ER PT S AU Lu, N Taylor, ZT Chassin, DP Guttromson, R Studham, S AF Lu, N Taylor, ZT Chassin, DP Guttromson, R Studham, S GP IEEE TI Parallel computing environments and methods for power distribution system simulation SO 2005 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS, 1-3 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 12-16, 2005 CL San Francisco, CA SP IEEE Power Engn Soc DE parallel computation; load modeling; message passing interface (MPI); multi-processor supercomputer AB The development of cost-effective high-performance parallel computing on multi-processor supercomputers makes it attractive to port excessively time consuming simulation software from personal computers (PC) to super computes. The power distribution system simulator (PDSS) takes a bottom-up approach and simulates load at the appliance level, where detailed thermal models for appliances are used. This approach works well for a small power distribution system consisting of a few thousand appliances. When the number of appliances increases, the simulation uses up the PC memory and its runtime increases to a point where the approach is no longer feasible to model a practical large power distribution system. This paper presents an effort made to port a PC-based power distribution system simulator to a 128-processor shared-memory supercomputer. The paper offers an overview of the parallel computing environment and a description of the modification made to the PDSS model. The performance of the PDSS running on a standalone PC and on the supercomputer is compared. Future research direction of utilizing parallel computing in the power distribution system simulation is also addressed. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Pacific NW Natl Lab, POB 999,MSIN K5-20, Richland, WA 99352 USA. EM ning.lu@pnl.gov; todd.taylor@pnl.gov; david.chassin@pnl.gov; ross.guttromson@pnl.gov; scott.studham@pnl.gov 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 SN 1932-5517 BN 0-7803-9156-X J9 IEEE POWER ENG SOC PY 2005 BP 215 EP 220 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BDD09 UT WOS:000232799400033 ER PT S AU Lu, N Chassin, DP Widergren, SE AF Lu, N Chassin, DP Widergren, SE GP IEEE TI Modeling uncertainties in aggregated thermostatically controlled loads using a state queueing model SO 2005 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS, 1-3 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 12-16, 2005 CL San Francisco, CA SP IEEE Power Engn Soc C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Lu, N (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1932-5517 BN 0-7803-9156-X J9 IEEE POWER ENG SOC PY 2005 BP 1336 EP 1336 PG 1 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BDD09 UT WOS:000232799401061 ER PT S AU Bailey, AM AF Bailey, AM GP IEEE TI The Terascale Simulation Facility: Built for flexibility, scalability and reliability SO 2005 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS, 1-3 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 12-16, 2005 CL San Francisco, CA SP IEEE Power Engn Soc C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Lawrence Livermore Natl Lab, Livermore, CA 94550 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 SN 1932-5517 BN 0-7803-9156-X J9 IEEE POWER ENG SOC PY 2005 BP 2442 EP 2442 PG 1 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BDD09 UT WOS:000232799402082 ER PT S AU Roop, JM Fathelrahman, EM Widergren, SE AF Roop, JM Fathelrahman, EM Widergren, SE GP IEEE TI Price response can make the grid robust: An agent-based discussion SO 2005 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS, 1-3 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 12-16, 2005 CL San Francisco, CA SP IEEE Power Engn Soc DE agent-based modeling; adaptive systems; power system simulation; power system economics AB There is considerable agreement that a more price responsive system would make for a more robust grid. This raises the issue of how the end-user can be induced to accept a system that relies more heavily on price signals than the current system. From a modeling perspective, how should the software 'agent' representing the consumer of electricity be modeled so that this agent exhibits some price responsiveness in a realistic manner? To address these issues, we construct an agent-based approach that is realistic in the sense that it can transition from the current system behavior to one that is more price responsive. Evidence from programs around the country suggests that there are ways to implement such a program that could add robustness to the grid. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Roop, JM (reprint author), Pacific NW Natl Lab, POB 999,MSIN,K6-05, Richland, WA 99352 USA. EM joe.roop@pnl.gov; eihab.fathelrahman@pnl.gov; steve.widergren@pnl.gov NR 10 TC 2 Z9 2 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1932-5517 BN 0-7803-9156-X J9 IEEE POWER ENG SOC PY 2005 BP 2813 EP 2817 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BDD09 UT WOS:000232799402163 ER PT S AU Ehlen, MA Scholand, AJ AF Ehlen, MA Scholand, AJ GP IEEE TI Modeling interdependencies between power and economic sectors using the N-ABLE (TM) agent-based model SO 2005 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS, 1-3 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 12-16, 2005 CL San Francisco, CA SP IEEE Power Engn Soc DE infrastructure interdependencies; electric power sector; economic impacts; policy analysis AB The nation's electric power sector is highly interdependent with the economic sectors it serves; electric power needs are driven by economic activity while the economy itself depends on reliable and sustainable electric power. To advance higher level understandings of the vulnerabilities that result from these interdependencies and to identify the loss prevention and loss mitigation policies that best serve the nation, the National Infrastructure Simulation and Analysis Center is developing and using N-ABLE (TM), an agent-based microeconomic framework and simulation tool that models these interdependencies at the level of collections of individual economic firms. Current projects that capture components of these electric power and economic sector interdependencies illustrate some of the public policy issues that should be addressed for combined power sector reliability and national economic security. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Ehlen, MA (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 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 SN 1932-5517 BN 0-7803-9156-X J9 IEEE POWER ENG SOC PY 2005 BP 2824 EP 2828 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BDD09 UT WOS:000232799402165 ER PT S AU Conzelmann, G Boyd, G Koritarov, V Veselka, T AF Conzelmann, G Boyd, G Koritarov, V Veselka, T GP IEEE TI Multi-agent power market simulation using EMCAS SO 2005 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS, 1-3 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 12-16, 2005 CL San Francisco, CA SP IEEE Power Engn Soc DE regional electricity market; interconnections; power transactions; locational marginal prices AB Countries around the world continue to restructure their electricity markets and open them up to competition and private investors in pursuit of economic efficiency and new capital investment. However, the recent volatility exhibited by many restructured power markets, in combination with several prominent market failures, have highlighted the need for a better understanding of the complex interactions between the various market participants and the emerging overall market behavior. Advanced modeling approaches are needed that simulate the behavior of electricity markets over time and model how market participants may act and react to changes in the underlying economic, financial, and regulatory environments. This is particularly useful for developing sound market rules that will allow these markets to function properly. A new and promising approach is to model electricity markets as complex adaptive systems using an agent-based modeling and simulation approach, such as is implemented in the Electricity Market Complex Adaptive System (EMCAS) software. EMCAS provides an agentbased framework to capture and investigate the complex interactions between the physical infrastructures and the economic behavior of market participants that are a trademark of the newly emerging markets. This paper describes the EMCAS agents, their interactions, the unique insights obtained from agent-based models, and discusses current model applications in several U.S., Asian, and European markets. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Conzelmann, G (reprint author), Argonne Natl Lab, 9700 S Cass Ave,DIS-900, Argonne, IL 60439 USA. EM guenter@anl.gov NR 11 TC 17 Z9 17 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1932-5517 BN 0-7803-9156-X J9 IEEE POWER ENG SOC PY 2005 BP 2829 EP 2834 DI 10.1109/PES.2005.1489271 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BDD09 UT WOS:000232799402166 ER PT B AU Dixon, KR Lippitt, CE Forsythe, JC AF Dixon, KR Lippitt, CE Forsythe, JC GP IEEE TI Supervised machine learning for modeling human recognition of vehicle-driving situations SO 2005 IEEE/RSJ International Conference on Intelligent Robots and Systems, Vols 1-4 LA English DT Proceedings Paper CT IEEE/RSJ International Conference on Intelligent Robots and Systems CY AUG 02-06, 2005 CL Edmonton, CANADA SP IEEE, Robot Soc Japan ID CLASSIFICATION AB A classi cation pound system is developed to identify driving situations from labeled examples of previous occurrences. The purpose of the classi er pound is to provide physical context to a separate system that mitigates unnecessary distractions, allowing the driver to maintain focus during periods of high dif culty pound. While watching videos of driving, we asked different users to indicate their perceptions of the current situation. We then trained a classi er pound to emulate the human recognition of driving situations using the Sandia Cognitive Framework. In unstructured conditions, such as driving in urban areas and the German autobahn, the classi er pound was able to correctly predict human perceptions of driving situations over 95% of the time. This paper focuses on the learning algorithms used to train the driving-situation classi er pound. Future work will reduce the human efforts needed to train the system. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Dixon, KR (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 17 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8912-3 PY 2005 BP 474 EP 479 DI 10.1109/IROS.2005.1545026 PG 6 WC Computer Science, Artificial Intelligence; Robotics SC Computer Science; Robotics GA BDV16 UT WOS:000235632100077 ER PT S AU Washburn, C Moorman, MW Hamilton, TW Robinson, AL Mowry, C Manley, RG Shelmidine, G Manginell, RP AF Washburn, C Moorman, MW Hamilton, TW Robinson, AL Mowry, C Manley, RG Shelmidine, G Manginell, RP GP IEEE TI Micro-flame ionization detection using a catalytic micro-combustor SO 2005 IEEE SENSORS, VOLS 1 AND 2 SE IEEE Sensors LA English DT Proceedings Paper CT 4th IEEE Conference on Sensors CY OCT 31-NOV 03, 2005 CL Irvine, CA SP IEEE Sensors Council DE micro-flame ionization detection; microcombustor; catalytic microcombustor ID SPECTROMETER AB A microflame-based detector has been developed for sensing a broad range of chemical analytes. This detector combines calorimetry and flame ionization detection (FID) to produce unique analyte signatures. The microcombustor consists of a micromachined microhotplate with a catalyst on its surface, such as platinum/alumina, to rapidly initiate the ionization event. The low power microcombustor design permits quick, efficient heating of the deposited film. To perform calorimetric detection of analytes, the change in power required to maintain the resistive microhotplate heater at a constant temperature is measured. For FID, electrodes are placed around the microcombustor flame zone with an electrometer circuit measuring the production of ions. The calorimetric and FID modes respond generally to all hydrocarbons. Importantly these detection modes can be established on one convenient simultaneous microcombustor platform. The performance of the microFID mode is emphasized herein. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Washburn, C (reprint author), Sandia Natl Labs, POB 5800 M-S 0892, Albuquerque, NM 87185 USA. EM cmwashb@sandia.gov OI Manley, Robert/0000-0002-6518-3528 NR 19 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1930-0395 BN 0-7803-9056-3 J9 IEEE SENSOR PY 2005 BP 322 EP 325 PG 4 WC Instruments & Instrumentation; Remote Sensing SC Instruments & Instrumentation; Remote Sensing GA BEE80 UT WOS:000237003500080 ER PT S AU Chorpening, BT Hill, CP Robinson, JC Ontko, JS Casleton, KH AF Chorpening, BT Hill, CP Robinson, JC Ontko, JS Casleton, KH GP IEEE TI Initial development of an ion-based bidirectional flow sensor SO 2005 IEEE SENSORS, VOLS 1 AND 2 SE IEEE Sensors LA English DT Proceedings Paper CT 4th IEEE Conference on Sensors CY OCT 31-NOV 03, 2005 CL Irvine, CA SP IEEE Sensors Council ID FLAME IONIZATION DETECTOR AB A novel method for monitoring air or dilute air-fuel mixture flow is initially developed and tested. Although many flow sensors are commercially available, none appear to have the. combination of harsh environment durability (> 600 degrees C), fast response, bidirectional now sensitivity, and low pressure drop desired for the application in hybrid power generation systems. The flow sensor described here uses the ions produced in a hydrocarbon flame to seed the gas flow, and then detects the current resulting from the flow induced drift of charged species in two directions from the flame source. Initial results show that the sensor is sensitive to flow reversal, but suffers from difficulties with flame blowout at high gas velocities. C1 US DOE, Natl Energy Technol Lab, Morgantown, WV USA. RP Chorpening, BT (reprint author), US DOE, Natl Energy Technol Lab, Morgantown, WV USA. EM Benjamin.chorpening@netl.doe.gov 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 SN 1930-0395 BN 0-7803-9056-3 J9 IEEE SENSOR PY 2005 BP 561 EP 563 PG 3 WC Instruments & Instrumentation; Remote Sensing SC Instruments & Instrumentation; Remote Sensing GA BEE80 UT WOS:000237003500139 ER PT S AU Moorman, M Manginell, RP Hamilton, TW Antel, W Zhang, HM Nirmalan, N AF Moorman, M Manginell, RP Hamilton, TW Antel, W Zhang, HM Nirmalan, N GP IEEE TI Lower heating value sensor for fuel monitoring SO 2005 IEEE SENSORS, VOLS 1 AND 2 SE IEEE Sensors LA English DT Proceedings Paper CT 4th IEEE Conference on Sensors CY OCT 31-NOV 03, 2005 CL Irvine, CA SP IEEE Sensors Council ID PLATINUM THIN-FILMS AB This work details the development of a low cost, lower heating value (LHV) sensor that consists of a catalytic film deposited on the surface of a micromachined hotplate. The micromachined sensor has low heat capacity and thermal conductivity, making it appropriate for accurate LHV determination. Catalytically combusting the fuel provides the capability of direct LHV measurement, unlike most LHV measurement systems which rely on inference. The results of extensive laboratory testing and preliminary field testing will be reported, which demonstrate the capability to measure LHV values to within +/- 5% accuracy across a wide range of fuel values. Field testing results have shown LHV determination to within +/- 1.2% over a more narrow range of fuel heating values. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Moorman, M (reprint author), Sandia Natl Labs, 01722 Micro Total Analyt Syst, Albuquerque, NM 87185 USA. EM mmoorma@sandia.gov 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 SN 1930-0395 BN 0-7803-9056-3 J9 IEEE SENSOR PY 2005 BP 802 EP 805 PG 4 WC Instruments & Instrumentation; Remote Sensing SC Instruments & Instrumentation; Remote Sensing GA BEE80 UT WOS:000237003500200 ER PT S AU Chorpening, BT Thornton, JD Benson, KJ AF Chorpening, BT Thornton, JD Benson, KJ GP IEEE TI Flame ionization sensor testing in a pressurized combustor SO 2005 IEEE SENSORS, VOLS 1 AND 2 SE IEEE Sensors LA English DT Proceedings Paper CT 4th IEEE Conference on Sensors CY OCT 31-NOV 03, 2005 CL Irvine, CA SP IEEE Sensors Council AB The National Energy Technology Laboratory (NETL) and Woodward Industrial Controls are developing a Combustion Control and Diagnostics Sensor (CCADS), an ionization-based sensor for monitoring hydrocarbon combustion in turbines. The patented CCADS design offers a unique multi-function sensor capability. This unique capability coupled with a durable and simple design has increased commercial interest in CCADS for gas turbine applications. A commercial prototype CCADS has been developed and tested under a Cooperative Research and Development Agreement (CRADA) between NETL and Woodward. Tests in an industrial-scale high pressure combustor demonstrated detection of flashback, combustion dynamics monitoring, and detection of lean blowout precursors. With realtime monitoring of the combustion process that CCADS can provide, turbine controls are envisioned which would allow sustained low-emissions performance. C1 US DOE, Energy Syst Dynam Div, Natl Energy Technol Lab, Morgantown, WV USA. RP Chorpening, BT (reprint author), US DOE, Energy Syst Dynam Div, Natl Energy Technol Lab, Morgantown, WV USA. EM Benjamin.chorpening@netl.doe.gov; kbenso@woodward.com 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 SN 1930-0395 BN 0-7803-9056-3 J9 IEEE SENSOR PY 2005 BP 987 EP 990 PG 4 WC Instruments & Instrumentation; Remote Sensing SC Instruments & Instrumentation; Remote Sensing GA BEE80 UT WOS:000237003500246 ER PT B AU Briles, SD Arrowood, J Cases, T Turcotte, D Fiset, E AF Briles, Scott D. Arrowood, Joseph, Jr. Cases, Thierry Turcotte, Dakx Fiset, Etienne GP IEEE TI Real-time implementation of an adaptive Bayesian beamformer SO 2005 IEEE/SP 13th Workshop on Statistical Signal Processing (SSP), Vols 1 and 2 LA English DT Proceedings Paper CT 13th IEEE Workshop on Statistical Signal Processing CY JUL 17-20, 2005 CL Bordeaux, FRANCE SP IEEE ID COVARIANCE-MATRIX AB Ail implementation of the adaptive Bayesian beamformer is examined for execution on field-programmable-gate-array (FPGA) devices. Using multiple sensor inputs, the Bayesian beamformer can estimate the direction-of-arrival (DOA) of a low-power signal in an environment that is simultaneously populated by high-power interference of limited DOA knowledge. A weighted sum of a discrete set of beamformers with known associated DOAs forms the Bavesian beamformer. Previously observed data provides the basis for the calculation of the a posteriori probability distribution function that renders the sum Weights. This paper incorporates further approximations to the derivations to allow for its implementation on FPGA devices. in particular those with lesser g-ate counts. The feasibility of an all-FGPA implementation versus a heterogeneous implementation is explored. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Briles, SD (reprint author), Los Alamos Natl Lab, Los Alamos, NM 87545 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 0-7803-9403-8 PY 2005 BP 231 EP 236 PG 6 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BEU24 UT WOS:000239515900043 ER PT B AU Cui, XH Potok, TE Palathingal, P AF Cui, XH Potok, TE Palathingal, P GP IEEE TI Document clustering using Particle Swarm Optimization SO 2005 IEEE Swarm Intelligence Symposium LA English DT Proceedings Paper CT IEEE Swarm Intelligence Symposium CY JUN 08-10, 2005 CL Pasadena, CA SP IEEE ID ALGORITHMS AB Fast and high-quality document clustering algorithms play an important role in effectively navigating, summarizing, and organizing information. Recent studies have shown that partitional clustering algorithms are more suitable for clustering large datasets. However, the K-means algorithm, the most commonly used partitional clustering algorithm, can only generate a local optimal solution. In this paper, we present a Particle Swarm Optimization (PSO) document clustering algorithm. Contrary to the localized searching of the K-means algorithm, the PSO clustering algorithm performs a globalized search in the entire solution space. In the experiments we conducted, we applied the PSO, K-means and hybrid PSO clustering algorithm on four different text document datasets. The number of documents in the datasets ranges from 204 to over 800, and the number of terms ranges from over 5000 to over 7000. The results illustrate that the hybrid PSO algorithm can generate more compact clustering results than the K-means algorithm. C1 Oak Ridge Natl Lab, Computat Sci & Engn Div, Appl Software Engn Res Grp, Oak Ridge, TN 37831 USA. RP Cui, XH (reprint author), Oak Ridge Natl Lab, Computat Sci & Engn Div, Appl Software Engn Res Grp, POB 2008, Oak Ridge, TN 37831 USA. NR 25 TC 3 Z9 3 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-8916-6 PY 2005 BP 185 EP 191 PG 7 WC Computer Science, Artificial Intelligence; Computer Science, Cybernetics; Computer Science, Theory & Methods SC Computer Science GA BDJ06 UT WOS:000233683900027 ER PT B AU Markel, T Simpson, A AF Markel, T Simpson, A GP IEEE TI Energy storage systems considerations for grid-charged hybrid electric vehicles SO 2005 IEEE Vehicle Power and Propulsion Conference (VPPC) LA English DT Proceedings Paper CT IEEE Vehicle Power and Propulsion Conference (VPPC) CY SEP 07-09, 2005 CL Chicago, IL SP IEEE AB This paper discusses battery power and energy requirements for grid-charged parallel hybrid electric vehicles (HEVs) with different operating strategies. First, it considers the traditional all-electric-range-based operating concept and shows that this strategy can require a larger, more expensive battery due to the simultaneous requirement for high energy and power. It then proposes an alternative "electric-assist" operating concept for grid-charged HEVs to enable the use of a smaller, less costly battery. However, this strategy is expected to reduce the vehicle efficiency during both charge-depleting and -sustaining operation. The paper concludes by identifying several key questions for future research. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Markel, T (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 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 0-7803-9280-9 PY 2005 BP 344 EP 349 DI 10.1109/VPPC.2005.1554581 PG 6 WC Engineering, Electrical & Electronic; Engineering, Mechanical; Transportation Science & Technology SC Engineering; Transportation GA BEC33 UT WOS:000236759900059 ER PT B AU Harathan, D Pesaran, A Vlahinos, A Kim, GH AF Harathan, D Pesaran, A Vlahinos, A Kim, GH GP IEEE TI Improving battery design with electro-thermal modeling SO 2005 IEEE Vehicle Power and Propulsion Conference (VPPC) LA English DT Proceedings Paper CT IEEE Vehicle Power and Propulsion Conference (VPPC) CY SEP 07-09, 2005 CL Chicago, IL SP IEEE DE HEV (hybrid electric vehicle); thermal management; nickel metal hydride; battery model; simulation AB Operating temperature greatly affects the performance and life of batteries in electric and hybrid vehicles. Increased attention is necessary to battery thermal management. Electrochemical models and finite element analysis tools are available for predicting the thermal performance of batteries, but each has limitations. In this study we describe an electro-thermal finite element approach that predicts the thermal performance of a cell or module with realistic geometry. To illustrate the process, we simulated the thermal performance of two generations of Panasonic prismatic nickel- metal- hydride modules used in the Toyota Prius. The model showed why the new generation of Panasonic modules had better thermal performance. Thermal images from two battery modules under constant current discharge indicate that the model predicts the experimental trend reasonably well. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Harathan, D (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 6 TC 0 Z9 0 U1 1 U2 9 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-9280-9 PY 2005 BP 368 EP 375 PG 8 WC Engineering, Electrical & Electronic; Engineering, Mechanical; Transportation Science & Technology SC Engineering; Transportation GA BEC33 UT WOS:000236759900062 ER PT B AU Ozpineci, B Chinthavali, MS Tolbert, LM AF Ozpineci, B Chinthavali, MS Tolbert, LM GP IEEE TI A 55 kW three-phase automotive traction inverter with SIC schottky diodes SO 2005 IEEE Vehicle Power and Propulsion Conference (VPPC) LA English DT Proceedings Paper CT IEEE Vehicle Power and Propulsion Conference (VPPC) CY SEP 07-09, 2005 CL Chicago, IL SP IEEE AB Silicon carbide (SiC) power devices are expected to have an impact on power converter efficiency, weight, volume, and reliability. Presently, only SiC Schottky diodes are commercially available at relatively low current ratings. Oak Ridge National Laboratory has collaborated with Cree and Semikron to build a Si IGBT-SiC Schottky diode hybrid 55kW inverter by replacing the Si pn diodes in Semikron's automotive inverter with Cree's made-to-order higher current SiC Schottky diodes. This paper shows the results obtained from testing this inverter and compares it to a similar all-Si inverter. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Ozpineci, B (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. OI Ozpineci, Burak/0000-0002-1672-3348 NR 13 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-9280-9 PY 2005 BP 541 EP 546 DI 10.1109/VPPC.2005.1554611 PG 6 WC Engineering, Electrical & Electronic; Engineering, Mechanical; Transportation Science & Technology SC Engineering; Transportation GA BEC33 UT WOS:000236759900089 ER PT B AU Massad, JE Sumali, H Epp, DS Dyck, CW AF Massad, JE Sumali, H Epp, DS Dyck, CW BE Badawy, W Moussa, W TI Modeling, simulation, and testing of the mechanical dynamics of an RF MEMS switch SO 2005 INTERNATIONAL CONFERENCE ON MEMS, NANO AND SMART SYSTEMS, PROCEEDINGS LA English DT Proceedings Paper CT International Conference on MEMS, NANO and Smart Systems CY JUL 24-27, 2005 CL Banff, CANADA SP IEEE CAS TE BioCAs, IEEE Circuit & Syst Soc AB Mechanical dynamics can be a determining factor for the switching speed of radio-frequency micro electromechanical systems (RF MEMS) switches. This paper presents the simulation of the mechanical motion of a microswitch under actuation. The switch has a plate suspended by springs. When an electrostatic actuation is applied, the plate moves toward the substrate and closes the switch. Simulations are calculated via a high-fidelity finite element model that couples solid dynamics with electrostatic actuation. It incorporates non-linear coupled dynamics and accommodates fabrication variations. Experimental modal analysis gives results in the frequency domain that verifies the natural frequencies and mode shapes predicted by the model. An effective 1D model is created and used to calculate an actuation voltage waveform that minimizes switch velocity at closure. In the experiment, the switch is actuated with this actuation voltage, and the displacements of the switch at various points are measured using a laser Doppler velocimeter through a microscope. The experiments are repeated on several switches from different batches. The experimental results verify the model. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 7 TC 10 Z9 10 U1 0 U2 2 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA BN 0-7695-2398-6 PY 2005 BP 237 EP 240 DI 10.1109/ICMENS.2005.77 PG 4 WC Engineering, Electrical & Electronic; Engineering, Mechanical; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA BDO07 UT WOS:000234540800072 ER PT B AU Starr, MJ Reedy, ED Corwin, AD Carpick, RW Flater, EE AF Starr, MJ Reedy, ED Corwin, AD Carpick, RW Flater, EE BE Badawy, W Moussa, W TI Contact mechanics description of inelastic displacement response of a nano-positioning device SO 2005 INTERNATIONAL CONFERENCE ON MEMS, NANO AND SMART SYSTEMS, PROCEEDINGS LA English DT Proceedings Paper CT International Conference on MEMS, NANO and Smart Systems CY JUL 24-27, 2005 CL Banff, CANADA SP IEEE CAS TE BioCAs, IEEE Circuit & Syst Soc AB A classical mechanistic model was developed to capture the existence of pre-sliding tangential deflection (PSTD) in contacting polysilicon and coated polysilicon surfaces. For the purposes of modeling asperity friction, experiments have shown, and been supported through detailed finite element analyses, that frictional forces developed through tangential sliding scale linearly through a material parameter known as the junction strength. A junction strength model coupled with a discrete quasi-static contact mechanics analysis, using contacting surface descriptions sampled by AFM from actual polysilicon surfaces, predicts inelastic tangential displacements that are qualitatively consistent with observed PSTD response. The simulations imply that the existence of PSTD depends not only on the spatial characteristics of contacting surfaces, but also on the local loading characteristics. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 4 TC 2 Z9 2 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 0-7695-2398-6 PY 2005 BP 421 EP 422 DI 10.1109/ICMENS.2005.3 PG 2 WC Engineering, Electrical & Electronic; Engineering, Mechanical; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA BDO07 UT WOS:000234540800113 ER PT S AU McCorquodale, P Colella, P Balls, GT Baden, SB AF McCorquodale, P Colella, P Balls, GT Baden, SB BE Skeie, T Yang, CS TI A scalable parallel Poisson solver in three dimensions with infinite-domain boundary conditions SO 2005 INTERNATIONAL CONFERENCE ON PARALLEL PROCESSING WORKSHOPS, PROCEEDINGS SE International Conference on Parallel Processing Workshops LA English DT Proceedings Paper CT 34th International Conference on Parallel Processing (ICPP) CY JUN 14-17, 2005 CL Oslo, NORWAY SP Int Assoc Comp & Commun, Simula Res Lab, Res Council Norway, Univ Oslo, Norwegian Comp Soc ID LOCAL CORRECTIONS; ALGORITHM; EQUATION AB We present an elliptic free space solver that offers vastly improved performance over a previous variant of the algorithm. We currently scale up to 1024 processors of an IBM SP system, and we are planning to port the solver to Blue Gene/L. The solver employs a method of local corrections that avoids the need for costly communication, while retaining parallel scalability of the method. Communication costs are generally small: 25 percent of the total running time or less for runs on up to 512 processors and 37 percent of the total time on 1024 processors. The numerical overheads incurred are independent of the number of processors for a wide range of problem sizes. The solver currently handles infinite-domain (free space) boundary conditions, but may be reformulated to accommodate other kinds of boundary conditions as well. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Appl Numer Algorithms Grp, Berkeley, CA 94720 USA. RP Univ Calif Berkeley, Lawrence Berkeley Lab, Appl Numer Algorithms Grp, Berkeley, CA 94720 USA. EM pwmccorquodale@lbl.gov; pcolella@lbl.gov; gballs@cs.ucsd.edu; baden@cs.ucsd.edu NR 21 TC 2 Z9 2 U1 1 U2 1 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA SN 1530-2016 BN 0-7695-2381-1 J9 INT CONF PARA PROC PY 2005 BP 163 EP 172 DI 10.1109/ICPPW.2005.17 PG 10 WC Computer Science, Theory & Methods SC Computer Science GA BCP53 UT WOS:000230570200019 ER PT S AU Borrill, J Carter, J Oliker, L Skinner, D Biswas, R AF Borrill, J Carter, J Oliker, L Skinner, D Biswas, R BE Feng, W Duato, J TI Integrated performance monitoring of a cosmology application on leading HEC platforms SO 2005 International Conference on Parallel Processsing, Proceedings SE PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON PARALLEL PROCESSING LA English DT Proceedings Paper CT 34th International Conference on Parallel Processing (ICPP) CY JUN 14-17, 2005 CL Oslo, NORWAY SP Int Assoc Comp & Commun, Simula Res Lab, Res Council Norway, Univ Oslo, Norwegian Comp Soc DE Cosmic Microwave Background; MADCAP; Altix Columbia; Earth Simulator; X1 Phoenix; power3 Seaborg; parallel performance characterization AB The Cosmic Microwave Background (CMB) is an exquisitely sensitive probe of the fundamental parameters of cosmology. Extracting this information is computationally, intensive, requiring massively parallel computing and sophisticated numerical algorithms. In this work we present MADbench, a lightweight version of the MADCAP CMB power spectrum estimation code that retains the operational complexity and integrated system requirements. In addition, to quantify communication behavior across a variety of. architectural platforms, we introduce the Integrated Performance Monitoring (IPM) package: a portable, lightweight, and scalable tool for effectively extracting MPI message-passing overheads. A performance characterization study is conducted on some of the world's most powerful supercomputers, including the superscalar Seaborg (IBM Power3+) and CC-NUMA Columbia (SG1 Altix), as well as the vector-based Earth Simulator (NEC SX-6 enhanced) and Phoenix (Cray X1) systems. In-depth analysis shows that in order to bridge the gap between theoretical and sustained system performance, it is critical to gain a clear understanding of how the distinct parts of large-scale parallel applications interact with the individual subcomponents of HEC platforms. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Computat Res Div, Berkeley, CA 94720 USA. RP Borrill, J (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Computat Res Div, Berkeley, CA 94720 USA. NR 8 TC 12 Z9 12 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 SN 0190-3918 BN 0-7695-2380-3 J9 PROC INT CONF PARAL PY 2005 BP 119 EP 128 DI 10.1109/ICPP.2005.47 PG 10 WC Computer Science, Theory & Methods SC Computer Science GA BCP52 UT WOS:000230567500013 ER PT S AU Brightwell, R Goudy, S Underwood, K AF Brightwell, R Goudy, S Underwood, K BE Feng, W Duato, J TI A preliminary analysis of the MPI queue characterisitics of several applications SO 2005 International Conference on Parallel Processsing, Proceedings SE PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON PARALLEL PROCESSING LA English DT Proceedings Paper CT 34th International Conference on Parallel Processing (ICPP) CY JUN 14-17, 2005 CL Oslo, NORWAY SP Int Assoc Comp & Commun, Simula Res Lab, Res Council Norway, Univ Oslo, Norwegian Comp Soc ID HIGH-PERFORMANCE; NETWORK AB Understanding the message passing behavior and network resource usage of distributed-memory message-passing parallel applications is critical to achieving high performance and scalability. While much research has focused on how applications use critical compute related resources, relatively little attention has been devoted to characterizing the usage of network resources, specifically those needed by the network interface. This paper discusses the importance of understanding network interface resource usage requirements for parallel applications and describes an initial attempt to gather network resource usage data for several real-world codes. The results show widely varying usage patterns between processes in the same parallel job and indicate that resource requirements can change dramatically as process counts increase and input data changes. This suggests that general network resource management strategies may not be widely applicable, and that adaptive strategies or more fine-grained controls may be necessary for environments where network interface resources are severely constrained. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Brightwell, R (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 20 TC 5 Z9 5 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 SN 0190-3918 BN 0-7695-2380-3 J9 PROC INT CONF PARAL PY 2005 BP 175 EP 183 DI 10.1109/ICPP.2005.13 PG 9 WC Computer Science, Theory & Methods SC Computer Science GA BCP52 UT WOS:000230567500019 ER PT S AU Dunigan, TH Vetter, JS Worley, PH AF Dunigan, TH Vetter, JS Worley, PH BE Feng, W Duato, J TI Performance evaluation of the SGI Altix 3700 SO 2005 International Conference on Parallel Processsing, Proceedings SE PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON PARALLEL PROCESSING LA English DT Proceedings Paper CT 34th International Conference on Parallel Processing (ICPP) CY JUN 14-17, 2005 CL Oslo, NORWAY SP Int Assoc Comp & Commun, Simula Res Lab, Res Council Norway, Univ Oslo, Norwegian Comp Soc ID OCEAN AB SGI recently introduced the Altix 3700. In contrast to previous SGI systems, the Altix uses a modified version of the open source Linux operating system and the latest Intel IA-64 processors, the Intel Itanium2. The Altix also uses the next generation SGI interconnect, Numalink3 and NUMAfex, which provides a NUMA, cache-coherent, shared memory, multiprocessor system. In this paper, we present a performance evaluation of the SGI Altix using microbenchmarks, kernels, and mission applications. We find that the Altix provides many advantages over other non-vector machines and it is competitive with the Cray XI on a number of kernels and applications. The Altix also shows good scaling, and its globally shared memory allows users convenient parallelization with OpenMP or pthreads. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Dunigan, TH (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 8 TC 11 Z9 12 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 SN 0190-3918 BN 0-7695-2380-3 J9 PROC INT CONF PARAL PY 2005 BP 231 EP 240 DI 10.1109/ICPP.2005.61 PG 10 WC Computer Science, Theory & Methods SC Computer Science GA BCP52 UT WOS:000230567500025 ER PT S AU Lawry, WF Underwood, KD AF Lawry, WF Underwood, KD BE Feng, W Duato, J TI Considering the relative importance of network performance and network features SO 2005 International Conference on Parallel Processsing, Proceedings SE PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON PARALLEL PROCESSING LA English DT Proceedings Paper CT 34th International Conference on Parallel Processing (ICPP) CY JUN 14-17, 2005 CL Oslo, NORWAY SP Int Assoc Comp & Commun, Simula Res Lab, Res Council Norway, Univ Oslo, Norwegian Comp Soc AB Latency and bandwidth are usually considered to be the dominant factor in parallel application performance; however, recent studies have indicated that support for independent progress in MPI can also have a significant impact on application performance. This paper leverages the Cplant system at Sandia National Labs to compare a faster, vendor provided MPI library without independent progress to an internally developed MPI library that sacrifices some performance to provide independent progress. The results are surprising. Although some applications see significant negative impacts from the reduced network performance, others are more sensitive to the presence of independent progress. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Lawry, WF (reprint author), Sandia Natl Labs, POB 5800,MS-1110, Albuquerque, NM 87185 USA. NR 28 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 SN 0190-3918 BN 0-7695-2380-3 J9 PROC INT CONF PARAL PY 2005 BP 329 EP 337 DI 10.1109/ICPP.2005.26 PG 9 WC Computer Science, Theory & Methods SC Computer Science GA BCP52 UT WOS:000230567500036 ER PT S AU Wu, MS Kendall, RA Wright, K AF Wu, MS Kendall, RA Wright, K BE Feng, W Duato, J TI Optimizing collective communications on SMP clusters SO 2005 International Conference on Parallel Processsing, Proceedings SE PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON PARALLEL PROCESSING LA English DT Proceedings Paper CT 34th International Conference on Parallel Processing (ICPP) CY JUN 14-17, 2005 CL Oslo, NORWAY SP Int Assoc Comp & Commun, Simula Res Lab, Res Council Norway, Univ Oslo, Norwegian Comp Soc AB We describe a generic programming model to design collective communications on SMP clusters. The programming model utilizes shared memory for collective communications and overlapping intermode/intra-node communications, both of which are normally platform specific approaches. Several collective communications are designed based on this model and tested on three SMP clusters of different configurations. The results show that the developed collective communications can, with proper tuning, provide significant performance improvements over existing generic implementations. For example, when broadcasting an 8MB message our implementations outperform the vendor's MPI_Bcast by 35% on an IBM SP system, 51% on a G4 cluster, and 63% on an Intel cluster, the latter two using MPICH's MP1_Bcast. With all-gather operations using 8MB messages, our implementation outperform the vendor's MPI_Allgather by 75% on the IBM SP 60% on the Intel cluster, and 48% on the G4 cluster. C1 Iowa State Univ, Dept Elect & Comp Engn, Scalable Comp Lab, Ames Lab,US DOE, Ames, IA 50011 USA. RP Wu, MS (reprint author), Iowa State Univ, Dept Elect & Comp Engn, Scalable Comp Lab, Ames Lab,US DOE, Ames, IA 50011 USA. NR 17 TC 3 Z9 3 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 SN 0190-3918 BN 0-7695-2380-3 J9 PROC INT CONF PARAL PY 2005 BP 399 EP 407 PG 9 WC Computer Science, Theory & Methods SC Computer Science GA BCP52 UT WOS:000230567500043 ER PT B AU Talbott, T Peterson, M Schwidder, J Myers, JD AF Talbott, T Peterson, M Schwidder, J Myers, JD BE McQuay, W Smari, WW TI Adapting the Electronic Laboratory Notebook for the semantic era SO 2005 INTERNATIONAL SYMPOSIUM ON COLLABORATIVE TECHNOLOGIES AND SYSTEMS, PROCEEDINGS SE International Symposium on Collaborative Technologies and Systems-CTS LA English DT Proceedings Paper CT International Symposium on Collaborative Technologies and Systems CY MAY 15-20, 2005 CL St Louis, MO SP IEEE, IEEE Comp Soc, IEEE Syst, Man & Cybernet Soc DE Electronic Laboratory Notebooks; scientific annotation middleware; collaboration; semantic data management AB The open source Electronic Laborator; Notebook (ELN) is a collaborative, distributed, web-based notebook system, designed to provide researchers with a means to record and share their primary research notes and data. As with most electronic notebook (EN) systems, the ELN was originally designed as a closed system with its own data repository and implicit semantics. The Scientific Annotation Middleware (SAM) project, a Department of Energy (DOE)-funded effort at Pacific Northwest and Oak Ridge National Laboratories, envisions a new model in which ENs are simply one application contributing to a much richer and semantically explicit record. Such a record would include, for example, data provenance, descriptive metadata, and annotations from a wide range of applications, problem solving environments, and agents. This paper reports the adaptation of the ELN client to use SAM and the development of an initial set of SAM-based notebook services and semantic model, and then discusses the advantages of such an architecture in creating federated, human- and machine-interpretable, electronic research records. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Talbott, T (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. EM Tara.Talbott@pnl.gov; Michael.Peterson@pnl.gov; schwidderj@ornl.gov; Jim.Myers@pnl.gov OI Myers, James/0000-0001-8462-650X NR 8 TC 1 Z9 1 U1 2 U2 2 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA BN 0-7695-2387-0 J9 INT S COLLAB TECHNOL PY 2005 BP 136 EP 143 PG 8 WC Computer Science, Artificial Intelligence; Computer Science, Information Systems; Computer Science, Theory & Methods; Telecommunications SC Computer Science; Telecommunications GA BDK03 UT WOS:000233965100027 ER PT B AU von Laszewski, G Kodeboyina, D AF von Laszewski, G Kodeboyina, D GP IEEE TI A repository service for grid workflow components SO 2005 Joint International Conference on Autonomic and Autonomous Systems and International Conference on Networking and Services (ICAS/ICNS) LA English DT Proceedings Paper CT Joint International Conference on Autonomics and Autonomous Systems/International Conference on Networking and Services (ICAS/ICNS) CY OCT 23-28, 2005 CL Papeete, FR POLYNESIA AB As part of the Java CoG Kit we have defined a sophisticated workflow framework. This workflow frame-work projects an integrated approach towards executing tasks in Grid and non-Grid environments. One of the services needed is a convenient service to store, retrieve, and modify workflow components defined by the community similar to systems such as the comprehensive perl archive network. The availability of such a service will not only allow the definition of components useful for the greater grid community, but it will also be possible that it can be reused to support dynamically changing workflows managed by collaborative groups. In this paper we present a simple extensible framework to design, build, and deploy a workflow repository service. This repository is intended to be used in ad-hoc Grids or in community Grids. C1 Argonne Natl Lab, Argonne, IL 60440 USA. RP von Laszewski, G (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60440 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 0-7695-2725-6 PY 2005 BP 520 EP 529 PG 10 WC Telecommunications SC Telecommunications GA BDR75 UT WOS:000235131500085 ER PT B AU Amin, K von Laszewski, G Mikler, AR AF Amin, K von Laszewski, G Mikler, AR GP IEEE TI Quality assured ad hoc Grids SO 2005 JOINT INTERNATIONAL CONFERENCE ON AUTONOMIC AND AUTONOMOUS SYSTEMS AND INTERNATIONAL CONFERENCE ON NETWORKING AND SERVICES (ICAS/ICNS) LA English DT Proceedings Paper CT Joint International Conference on Autonomics and Autonomous Systems/International Conference on Networking and Services (ICAS/ICNS) CY OCT 23-28, 2005 CL Papeete, FR POLYNESIA AB This paper presents an integrated architecture for ad hoc Grids developed within the Java CoG Kit project. It provides an overview of the key component frameworks that collectively build the ad hoc Grid architecture. Further it outlines a formal model that can be formally evaluated. The paper also presents an enhancement to the Java CoG Kit to address requirements posed by ad hoc Grids. It integrates into the Java CoG Kit commodity technologies such as Jxta, and ClassAds. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Argonne Natl Lab, Argonne, IL 60439 USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7695-2725-6 PY 2005 BP 576 EP 585 PG 10 WC Telecommunications SC Telecommunications GA BDR75 UT WOS:000235131500093 ER PT B AU Crawford, MH Allerman, AA Fischer, AJ Bogart, KHA Lee, SR Chow, WW AF Crawford, MH Allerman, AA Fischer, AJ Bogart, KHA Lee, SR Chow, WW GP IEEE TI AlGaN-based deep ultraviolet LEDs: Materials challenges and device performance SO 2005 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS LA English DT Proceedings Paper CT Pacific Rim Conference on Lasers and Electro-Optics CY JUL 11-15, 2005 CL Tokyo, JAPAN ID LIGHT-EMITTING-DIODES AB We overview the materials challenges and device performance of deep ultraviolet-emitting AlGaN-based LEDs. Recent advances include milliwatt-level performance at 275-300 nm and the demonstration of electroluminescence at 254 nm and 237 nm. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM mhcrawf@sandia.gov NR 2 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-9242-6 PY 2005 BP 204 EP 205 PG 2 WC Optics SC Optics GA BEC31 UT WOS:000236757900099 ER PT S AU Seifter, A Boboridis, K Payton, JR Obst, AW AF Seifter, A Boboridis, K Payton, JR Obst, AW BE Paisley, DL Kleinfelder, S Snyder, DR Thompson, BJ TI A high-speed, four-wavelength infrared pyrometer for low temperature shock physics experiments SO 26th International Congress on High Speed Photography and Photonics SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 26th International Congress on High-Speed Photography and Photonics CY SEP 20-24, 2004 CL Alexandria, VA SP Los Alamos Natl Lab, Los Alamos Natl Lab Phys Div, SPIE DE pyrometry; black body radiation; shock physics; infrared detectors; infrared optics AB In addition to the standard problems associated with contactless temperature measurements, pyrometry in shock physics experiments has many additional concerns. These include background temperatures which are often higher than the substrate temperature, non-uniform sample temperature due to hotspots and ejecta, fast sample motion up to several km.s(-1), fast-changing sample emissivity at shock breakout, and very short measurement times. We have designed a four channel, high speed near-infrared (NIR) pyrometer for measurements in the 400 to 1000K blackbody temperature range. The front end optics are specific to each experiment, utilizing preferably reflective optics in order to mitigate spectral dispersion. Next-generation instruments under development are also discussed. C1 Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87545 USA. RP Seifter, A (reprint author), Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87545 USA. NR 10 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 0-8194-5530-X J9 P SOC PHOTO-OPT INS PY 2005 VL 5580 BP 18 EP 23 DI 10.1117/12.571456 PG 6 WC Optics; Imaging Science & Photographic Technology SC Optics; Imaging Science & Photographic Technology GA BCE99 UT WOS:000228994200003 ER PT S AU Seifter, A Grover, M Holtkamp, DB Payton, JR Rodriguez, P Turley, D Obst, AW AF Seifter, A Grover, M Holtkamp, DB Payton, JR Rodriguez, P Turley, D Obst, AW BE Paisley, DL Kleinfelder, S Snyder, DR Thompson, BJ TI Low-temperature measurements on shock loaded tin SO 26th International Congress on High Speed Photography and Photonics SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 26th International Congress on High-Speed Photography and Photonics CY SEP 20-24, 2004 CL Alexandria, VA SP Los Alamos Natl Lab, Los Alamos Natl Lab Phys Div, SPIE DE shock physics; pyrometry; temperature measurements; high explosives; ejecta AB In an effort to understand the influence of different surface finishes and the effect of ejecta mass on free surface temperature measurements, we performed a series of high-explosively (HE) shocked tin experiments. In this series of experiments the surface finish (i.e, specular, shallow grooves (16 mu inch), deep grooves (200 mu inch and "ball-rolled" surfaces) and the ambient atmosphere (from 1.2 torr, to atmospheric air, as well as 1 atm helium) were varied. With a similar to 180 kbar shock pressure the temperature results agreed for all but the very deep groove (> 200 mu inch) surfaces investigated. C1 Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87545 USA. RP Seifter, A (reprint author), Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87545 USA. NR 16 TC 1 Z9 1 U1 0 U2 2 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-5530-X J9 P SOC PHOTO-OPT INS PY 2005 VL 5580 BP 93 EP 105 DI 10.1117/12.571449 PG 13 WC Optics; Imaging Science & Photographic Technology SC Optics; Imaging Science & Photographic Technology GA BCE99 UT WOS:000228994200011 ER PT S AU Goodenough, C Kumar, S Marr-Lyon, M Boyts, A Prestridge, K Rightley, P Tomkins, C Cannon, M Kamm, J Rider, W Zoldi-Sood, C Orlicz, G Vorobieff, P AF Goodenough, C Kumar, S Marr-Lyon, M Boyts, A Prestridge, K Rightley, P Tomkins, C Cannon, M Kamm, J Rider, W Zoldi-Sood, C Orlicz, G Vorobieff, P BE Paisley, DL Kleinfelder, S Snyder, DR Thompson, BJ TI Planar velocity and scalar concentration measurements in shock-accelerated, unstable fluid interfaces SO 26th International Congress on High Speed Photography and Photonics SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 26th International Congress on High-Speed Photography and Photonics CY SEP 20-24, 2004 CL Alexandria, VA SP Los Alamos Natl Lab, Los Alamos Natl Lab Phys Div, SPIE AB We report applications of several high-speed photographic techniques to diagnose fluid instability and the onset of turbulence in an ongoing experimental study of the evolution of shock-accelerated, heavy-gas cylinders. Results are at Reynolds numbers well above that associated with the turbulent and mixing transitions. Recent developments in diagnostics enable high-resolution, planar (213) measurements of velocity fields (using particle image velocimetry, or PIV) and scalar concentration (using planar laser-induced fluorescence, or PLIF). The purpose of this work is to understand the basic science of complex, shock-driven flows and to provide high-quality data for code validation and development. The combination of these high-speed optical methods, PIV and PLIF, is setting a new standard in validating large codes for fluid simulations. The PIV velocity measurements provide quantitative evidence of transition to turbulence. In the PIV technique, a frame transfer camera with a 1 ms separation is used to image flows illuminated by two 10 ns laser pulses. Individual particles in a seeded flow are tracked from frame to frame to produce a velocity field. Dynamic PLIF measurements of the concentration field are high-resolution, quantitative dynamic data that reveal finely detailed structure at several instances after shock passage. These structures include those associated with the incipient secondary instability and late-time transition. Multiple instances of the flow are captured using a single frame Apogee camera and laser pulses with 140 mu s spacing. We describe tradeoffs of diagnostic instrumentation to provide PLIF images. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Goodenough, C (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RI Prestridge, Kathy/C-1137-2012 OI Prestridge, Kathy/0000-0003-2425-5086 NR 7 TC 1 Z9 2 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-5530-X J9 P SOC PHOTO-OPT INS PY 2005 VL 5580 BP 186 EP 192 DI 10.1117/12.577110 PG 7 WC Optics; Imaging Science & Photographic Technology SC Optics; Imaging Science & Photographic Technology GA BCE99 UT WOS:000228994200020 ER PT S AU McCluskey, CW Wilke, MD Turley, WD Stevens, GD Veeser, LR Grover, M Adams, A AF McCluskey, CW Wilke, MD Turley, WD Stevens, GD Veeser, LR Grover, M Adams, A BE Paisley, DL Kleinfelder, S Snyder, DR Thompson, BJ TI Infrared images of shock-heated tin SO 26th International Congress on High Speed Photography and Photonics SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 26th International Congress on High-Speed Photography and Photonics CY SEP 20-24, 2004 CL Alexandria, VA SP Los Alamos Natl Lab, Los Alamos Natl Lab Phys Div, SPIE DE infrared focal plane array; FPA; InSb; resolution; magnification; mid-infrared imagery; dynamic shock physics experiments; material grain structure AB High-resolution, gated infrared images were taken of tin samples shock heated to just below the 505 K melting point. Sample surfaces were either polished or diamond-turned, with grain sizes ranging from about 0.05 to 10 mm. A high explosive in contact with a 2-mm-thick tin sample induced a peak sample stress of 18 GPa. Interferometer data from similarly-driven tin shots indicate that immediately after shock breakout the samples spall near the free (imaged) surface with a scab thickness of about 0.1 mm. Images were taken with gate widths of 0.2 to 0.5 mu s and start times ranging from 0.3 to 1.5 mu s after shock breakout. The camera and experimental techniques were described previously. [S.S. Lutz, et al., Gated IR images of shocked surfaces, in Shock Compression of Condensed Matter-2001, M.D. Furnish, ed., AIP (2002)]. Infrared radiation (3 to 5 pm) from the sample was imaged onto a gated InSb camera array with lens systems capable of resolving features on the order of 0.1 mm. Assuming a dynamic emissivity of 0.1, calculated temperatures were around 700 K for the millimeter-sized hot spots and 450 K in the surrounding area. The images showed different amounts and physical distribution of hot spots. Although there was a trend to more and higher-temperature hot spots with larger grain size, the hot spots do not appear to map directly to individual grain shapes or boundaries. C1 Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP McCluskey, CW (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. NR 12 TC 1 Z9 1 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-5530-X J9 P SOC PHOTO-OPT INS PY 2005 VL 5580 BP 466 EP 476 DI 10.1117/12.585558 PG 11 WC Optics; Imaging Science & Photographic Technology SC Optics; Imaging Science & Photographic Technology GA BCE99 UT WOS:000228994200051 ER PT S AU Malone, RM Bower, JR Bradley, DK Capelle, GA Celeste, JR Celliers, PM Collins, GW Eckart, MJ Eggert, JH Frogget, BC Guyton, RL Hicks, DG Kaufman, MI MacGowan, BJ Montelongo, S Edmund, AWNB Robinson, RB Tunnell, TW Watts, PW Zapata, PG AF Malone, RM Bower, JR Bradley, DK Capelle, GA Celeste, JR Celliers, PM Collins, GW Eckart, MJ Eggert, JH Frogget, BC Guyton, RL Hicks, DG Kaufman, MI MacGowan, BJ Montelongo, S Edmund, AWNB Robinson, RB Tunnell, TW Watts, PW Zapata, PG BE Paisley, DL Kleinfelder, S Snyder, DR Thompson, BJ TI Imaging VISAR diagnostic for the National Ignition Facility (NIF) SO 26TH INTERNATIONAL CONGRESS ON HIGH SPEED PHOTOGRAPHY AND PHOTONICS SE Proceedings of SPIE LA English DT Proceedings Paper CT 26th International Congress on High-Speed Photography and Photonics CY SEP 20-24, 2004 CL Alexandria, VA SP Los Alamos Natl Lab, Los Alamos Natl Lab Phys Div, SPIE DE VISAR; interferometer; streak camera; optical relay; National Ignition Facility (NIF) ID INTERFEROMETER AB The National Ignition Facility (NIF) requires diagnostics to analyze high-energy density physics experiments. A VISAR (Velocity Interferometry System for Any Reflector) diagnostic has been designed to measure shock velocities, shock breakout times, and shock emission of targets with sizes from I to 5 mm. An 8-inch-diameter fused silica triplet lens collects light at f/3 inside the 30-foot-diameter vacuum chamber. The optical relay sends the image out an equatorial port, through a 2-inch-thick vacuum window, and into two interferometers. A 60-kW VISAR probe laser operates at 659.5 mn with variable pulse width. Special coatings on the mirrors and cutoff filters are used to reject the NIF drive laser wavelengths and to pass a band of wavelengths for VISAR, passive shock breakout light, or thermal imaging light (bypassing the interferometers). The first triplet can be no closer than 500 mm from the target chamber center and is protected from debris by a blast window that is replaced after every event. The front end of the optical relay can be temporarily removed from the equatorial port, allowing other experimenters to use that port. A unique resolution pattern has been designed to validate the VISAR diagnostic before each use. All optical lenses are on kinematic mounts so that the pointing accuracy of the optical axis can be checked. Seven CCD cameras monitor the diagnostic alignment. C1 Bechtel Nevada, Los Alamos, NM 87544 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Malone, RM (reprint author), Bechtel Nevada, POB 809, Los Alamos, NM 87544 USA. EM malonerm@nv.doe.gov RI Hicks, Damien/B-5042-2015 OI Hicks, Damien/0000-0001-8322-9983 NR 6 TC 1 Z9 1 U1 0 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 0-8194-5530-X J9 PROC SPIE PY 2005 VL 5580 BP 505 EP 516 DI 10.1117/12.579285 PG 12 WC Optics; Imaging Science & Photographic Technology SC Optics; Imaging Science & Photographic Technology GA BCE99 UT WOS:000228994200055 ER PT S AU Goosman, D Wade, J Garza, R Avara, G Crabtree, T Rivera, A Hare, D Tolar, D Bratton, B AF Goosman, D Wade, J Garza, R Avara, G Crabtree, T Rivera, A Hare, D Tolar, D Bratton, B BE Paisley, DL Kleinfelder, S Snyder, DR Thompson, BJ TI Optical probes for continuous Fabry-Perot velocimetry inside materials SO 26th International Congress on High Speed Photography and Photonics SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 26th International Congress on High-Speed Photography and Photonics CY SEP 20-24, 2004 CL Alexandria, VA SP Los Alamos Natl Lab, Los Alamos Natl Lab Phys Div, SPIE DE velocimetry; embedded; fibers; Fabry-Perot AB We have used velocimetry for many years at LLNL to measure velocity-time histories of surfaces in dynamic experiments. We have developed and now use special fiber probes to make continuous shock-velocity measurements inside of materials. The goal is to extend the field of velocimetry into a new area of application in shock physics. At the last Congress we reported the successful use of our new filter system for selectively eliminating most of the non-Doppler-shifted light. We showed one record of a fiber embedded inside an explosive making a continuous detonation velocity-time history. At that time it was difficult to obtain complete records. We have now carried out over 65 inexpensive experiments usually using small cylinders or rectangular blocks of explosives or metals. Most were started by detonating a 25 mm diameter by 25 mm long cylinder of Comp B explosive to drive a shock into an adjacent material of similar dimensions, using our embedded fiber probes. In contrast to surface velocimetry, embedded measurements involve detailed hydrodynamic considerations in order to result in a successful record. Calculations have guided us in understanding various failed and successful experiments. The homogeneity of the explosive, poor contact, the materials used in the cladding and core of the fiber optic probes, and the shock speeds to be covered all greatly affect the success of an experiment. For example, a poor contact between the optical fiber and its environment causes severe loss of data. Non-symmetric air gaps on one side of the fiber cause 3 dimensional hydrodynamic effects, which cause the shock wave in the fiber core to be too steeply angled to reflect light. We have recently developed and successfully used a special probe to usually overcome this limitation. We have custom designed several unique types of fiber-optic probes for specialty applications, using both solid and liquid core materials, to extend the usable shock-velocity range. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Goosman, D (reprint author), Lawrence Livermore Natl Lab, POB 808,L-281, Livermore, CA 94550 USA. NR 5 TC 3 Z9 3 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 0-8194-5530-X J9 P SOC PHOTO-OPT INS PY 2005 VL 5580 BP 517 EP 528 DI 10.1117/12.566589 PG 12 WC Optics; Imaging Science & Photographic Technology SC Optics; Imaging Science & Photographic Technology GA BCE99 UT WOS:000228994200056 ER EF