FN Thomson Reuters Web of Science™ VR 1.0 PT B AU Krebs, GF Holmes, M AF Krebs, GF Holmes, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Measurement of the radiation incident on als NdFeB permanent magnet insertion device structures and a determination of their lifetime SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Measurements of the radiation incident on ALS insertion device NdFeB permanent magnet structures were carried out using thermoluminescence dosimeters. A plastic scintillator gamma telescope was utilized to unravel the various contributions to the integrated dose. Magnet lifetimes were calculated for various operational conditions. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Krebs, GF (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 796 EP 798 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800251 ER PT B AU Robin, D Safranek, J Decking, W Nishimura, H AF Robin, D Safranek, J Decking, W Nishimura, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Global beta-beating compensation of the ALS W16 wiggler SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The W16 wiggler is the first wiggler and highest field insertion device to be installed in the ALS storage ring. When the gaps of the W16 wiggler are closed, the vertical tune increases by 0.065 and the vertical beta function is distorted by up to +/- 37%. There are 48 quadrupoles in the ring whose fields can be adjusted individually to restore the tunes and partially compensate the beta-beating. In order to adjust the quadrupole field strengths to accurately compensate the focusing, it is necessary to have a method to precisely determine the beta-beating. In this paper we compare measurements of the induced beta-beating using two methods: measuring the tune dependence on quadrupole field strength and fitting a lattice model with measured response matrices. The fitted model also allows us to predict quadrupole field strengths that will best compensate the beta beating. These quadrupole field strengths are then applied and the resultant. beta-beating is measured. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Robin, D (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 799 EP 801 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800252 ER PT B AU Sasaki, S Schlueter, R Marks, S AF Sasaki, S Schlueter, R Marks, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Crossed elliptical polarization undulator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The first switching of polarization direction is possible by installing two identical helical undulators in series in a same straight section in a storage ring. By setting each undulator in a circular polarization mode in opposite handedness, one can obtain linearly polarized radiation with any required polarization direction depending on the modulator setting between two undulators. This scheme can be used without any major degradation of polarization degree in any low energy low emittance storage ring. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Sasaki, S (reprint author), Lawrence Berkeley Lab, 1 Cyclotron Rd, 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 0-7803-4376-X PY 1998 BP 802 EP 804 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800253 ER PT B AU Timossi, C Nishimura, H AF Timossi, C Nishimura, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Accelerator control software construction based on software object components SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We will be presenting the results of a recent effort on the use of software object components for software construction for the Advanced Light Source control system [1]. Components are written for Win32 for low-level access both to the current control system and to EPICS [2] Channel Access, and for higher level physics tools. We will discuss the merit of the component-based approach based on our experience with several examples. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Timossi, C (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 805 EP 807 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800254 ER PT B AU Zholents, A Fahmie, M Johnston, J Kim, C Luchini, K Massoletti, D de Vries, J AF Zholents, A Fahmie, M Johnston, J Kim, C Luchini, K Massoletti, D de Vries, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Modification of the ALS booster synchrotron for an experiment on optical stochastic cooling SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Modifications to the Booster synchrotron of the Advance Light Source of the Lawrence Berkeley National Laboratory have been made in preparation for a test of the Optical Stochastic Cooling in a single pass beam line, planned for installation in the extraction area of the synchrotron. Electron beam acceleration to 650 MeV, synchrotron radiation cooling at 650 MeV, and deceleration to 200 MeV have been demonstrated. Measurements have been made of the beam horizontal and vertical emittances and beam energy spread in the beam extracted from the synchrotron at 200 MeV and 250 MeV and compared with computer simulation results. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Accelerator & Fus Res, Berkeley, CA 94720 USA. RP Zholents, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Accelerator & Fus Res, 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 0-7803-4376-X PY 1998 BP 808 EP 810 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800255 ER PT B AU Corbett, J LeBlanc, G AF Corbett, J LeBlanc, G BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Ideas for fast accelerator model calibration SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB With the advent of a simple matrix inversion technique, measurement-based storage ring modeling has made rapid progress in recent years. Using fast computers with large memory, the matrix inversion procedure typically adjusts up to 10(3) model variables to fit the order of 10(5) measurements. The results have been surprisingly accurate. Physics aside, one of the next frontiers is to simplify the process and to reduce computation time. In this paper, we discuss two approaches to speed up the model calibration process: recursive least-squares fitting and a piecewise fitting approach. C1 Stanford Linear Accelerator Ctr, SSRL, Stanford, CA 94309 USA. RP Corbett, J (reprint author), Stanford Linear Accelerator Ctr, SSRL, Stanford, CA 94309 USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 832 EP 834 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800263 ER PT B AU Park, SH Sebek, JJ AF Park, SH Sebek, JJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The SPEAR RF cavity characterization at Stanford Synchrotron Radiation Laboratory SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB At the SPEAR storage ring, the 3 GeV stored beam is driven by a five-eel pi-mode standing wave cavity operating at 358.54 MHz. The frequency tuning and the field balance between the cells are feedback controlled by movable tuners at the end cells. Another cavity of the same type in the ring can be powered for higher beam currentin the future, but it is presently in a standby mode as a backup system. This idle cavity is also used to suppress the beam instability by manually positioning the tuners. For the purpose of cold tests, one PEP-I cavity is being prepared for the RF measurements. C1 Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. RP Park, SH (reprint author), Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, MS 69,POB 4349, 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 0-7803-4376-X PY 1998 BP 835 EP 837 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800264 ER PT B AU Hettel, R Boyce, R Brennan, S Corbett, J Cornacchia, M Davies-White, W Garren, A Hofmann, A Limborg, C Nosochkov, Y Nuhn, HD Rabedeau, T Safranek, J Wiedemann, H AF Hettel, R Boyce, R Brennan, S Corbett, J Cornacchia, M Davies-White, W Garren, A Hofmann, A Limborg, C Nosochkov, Y Nuhn, HD Rabedeau, T Safranek, J Wiedemann, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI SPEAR III - A brighter source at SSRL SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB By replacing the magnets and vacuum chamber for the 3 GeV SPEAR II storage ring, the natural emittance of the machine can be reduced from 130 to Is nm-rad and the stored current can be raised from 100 to 200 mA with a 50 h lifetime. This configuration increases focused photon flux for insertion device beamlines by an order of magnitude and the photon brightness for future undulators would exceed 10(18) at 5 keV. Due to a higher critical energy, the photon flux in the 20 keV range for bending magnet beamlines increases by more than two orders of magnitude. We present preliminary SPEAR III design study results and plans to implement the facility upgrade with minimal downtime for SSRL users. C1 Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. RP Hettel, R (reprint author), Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 838 EP 840 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800265 ER PT B AU Lumpkin, AH Berg, WJ Yang, BX AF Lumpkin, AH Berg, WJ Yang, BX BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Planned optical diagnostics for the APS low-energy undulator test line SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID FREE-ELECTRON-LASER; RADIATION; BEAM AB At the Advanced Photon Source (APS), an alternate configuration of the injector linacs (low-energy undulator test line) using an rf gun as the source is projected to provide low, normalized emittance electron beams (epsilon(n) similar to 5 pi mm mrad). In order to characterize such beams, the present intercepting Chromox screens with limited spatial resolution and temporal response are being complemented by optical transition radiation (OTR) screens at selected positions in the beamline to provide sub-100 mu m spatial resolution and sub-ps response times. Both gated cameras and streak cameras will be used to measure the beam properties. Additionally, coherent transition radiation (CTR) and diffraction radiation (DR) based techniques will be evaluated. These beam characterizations will support self-amplified spontaneous' emission (SASE) scaling experiments. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Lumpkin, AH (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 12 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 871 EP 873 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800276 ER PT B AU Lumpkin, AH Yang, BX Litvinenko, V Park, S Wang, P Wu, Y AF Lumpkin, AH Yang, BX Litvinenko, V Park, S Wang, P Wu, Y BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Initial application of a dual-sweep streak camera to the Duke storage ring OK-4 source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The visible and UV spontaneous emission radiation (SER) from the Duke OK-4 wiggler has been used with a Hamamatsu C5680 dual-sweep streak camera to characterize the stored electron beams. Particle beam energies of 270 and 500 MeV in the Duke storage ring were used in this initial application with the OK-4 adjusted to generate wavelengths from 500 nm to near 200 nm. The OK-4 magnetic system with its 68 periods provided a much stronger radiation source than a nearby bending magnet source point. Sensitivity to single-bunch, single-turn SER was shown down to 4 mu A beam current at lambda = 450 nm. The capability of seeing second passes in the FEL resonator at a wavelength near 200 nm was used to assess the cavity length versus orbit length. These tests (besides supporting preparation for W-visible SR FEL startups) are also relevant to possible diagnostics techniques for single-pass FEL prototype facilities. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Lumpkin, AH (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 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 0-7803-4376-X PY 1998 BP 874 EP 876 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800277 ER PT B AU Milton, SV Galayda, JN Gluskin, E AF Milton, SV Galayda, JN Gluskin, E BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The Advanced Photon Source Low-Energy Undulator Test Line SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB There are a number of fully commissioned 3rd-generation synchrotron light sources in the world today. So far they have met the demanding requirements of the user community; however, there is always a desire to go beyond what is presently available or even desirable. The Advanced Photon Source (APS) Low-Energy Undulator Test Line (LEUTL) was conceived to address the advancement of synchrotron light sources. The LEUTL uses the existing APS linac and a low-emittance electron gun, and by means of measurements of the beam and generated light, will test new and innovative undulators and push the technology and physics of single-pass, coherent light sources. The design and status of the LEUTL will be described along with its immediate capabilities and those planned for the future. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Milton, SV (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 0-7803-4376-X PY 1998 BP 877 EP 879 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800278 ER PT B AU Takahashi, H An, Y Nomura, M AF Takahashi, H An, Y Nomura, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Gamma-ray production using multi-photon Compton scattering SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID FREE-ELECTRON-SCATTERING AB The nonlinear Compton scattering cross-section for laser light is formulated by treating the electron in the laser field as a dressed electron, in which the laser field is expressed as classical field. In comparison, multi-photon Compton scattering can be represented by the Feynman diagram where the electron is treated as an undressed one; hence, this formula can be applied only to a low intensity laser. To study the effect of the coherency of the photon on Compton scattering, these two formulas were compared for the case of two-photon scattering. The difference might be due to the fact that the Feynman formula cannot take into account the coherency of the photon. To account for the coherency of a laser field in quantum mechanics, therefore, the formula based on coherent-state formalism is required. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Takahashi, H (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 880 EP 882 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800279 ER PT B AU Nguyen, DC Sheffield, RL Fortgang, CM Kinross-Wright, JM Ebrahim, NA Goldstein, JC AF Nguyen, DC Sheffield, RL Fortgang, CM Kinross-Wright, JM Ebrahim, NA Goldstein, JC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A high-power compact Regenerative Amplifier FEL SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID FREE-ELECTRON LASER AB The Regenerative Amplifier FEL (RAFEL) is a new FEL approach aimed at achieving the highest optical power from a compact rf-linac FEL. The key idea is to feed back a small fraction (<10%) of the optical power into a high-gain (similar to 10(5) in single pass) wiggler to enable the FEL to reach saturation in a few passes. This paper summarizes the design of a high-power compact regenerative amplifier FEL and describes the first experimental demonstration of the RAFEL concept. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Nguyen, DC (reprint author), Univ Calif Los Alamos Natl Lab, MS H851, Los Alamos, NM 87545 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 0-7803-4376-X PY 1998 BP 897 EP 899 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800285 ER PT B AU Lidia, SM Whittum, DH Donohue, JT AF Lidia, SM Whittum, DH Donohue, JT BE Comyn, M Craddock, MK Reiser, M Thomson, J TI W-Band free electron lasers for high gradient structure research SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We analyze two designs for W-Band free electron lasers for application as laboratory instruments in the study of millimeter wave accelerators at high gradient. The first design is based on the linear induction accelerator LELLA (CEA/CESTA, France), employs a 1-kA, XO-ns electron pulse, and corresponds to a helical TE11 200MW W-Band amplifier design. We analyze also a W-Band planar ubitron design making use of a SLAC-modulator, operating with a 480 kV, 300 A, sheet beam gun and producing a 5 MW, 1 mu s pulse. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Lidia, SM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 900 EP 902 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800286 ER PT B AU Bharadwaj, VK Bane, K Clendenin, J Emma, P Sheppard, JC Woodley, MD AF Bharadwaj, VK Bane, K Clendenin, J Emma, P Sheppard, JC Woodley, MD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Linac design for the LCLS project at SLAC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Linac Coherent Light Source (LCLS) at SLAG is being designed to produce intense, coherent 0.15-nm xrays. These x-rays will be produced by a single pass of a 15 GeV bunched electron beam through a long undulator. Nominally, the bunches have a charge of 1 nC, normalized transverse emittances of less than 1.5 pi mm-mr and an rms bunch length of 20 mu m. The electron beam will be produced using the last third of the SLAG 3-km linac in a manner compatible with simultaneous operation of the remainder of the linac for PEP-II. The linac design necessary to produce an electron beam with the required brightness for LC-LS is discussed, and the specific linac modifications are described. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Bharadwaj, VK (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 903 EP 905 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800287 ER PT B AU Bohn, CL AF Bohn, CL CA Jefferson Lab FEL Team BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Recirculating accelerator driver for a high-power free-electron laser: A design overview SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Jefferson Lab is building a free-electron laser (FEL) to produce continuous-wave (cw), kW-level light at 3-6 mu m wavelength. A superconducting linac will drive the laser, generating a 5 mA average current, 42 MeV energy electron beam. A transport lattice will recirculate the beam back to the linac for deceleration and conversion of about 75% of its power into rf power. Bunch charge will range up to 135 pC, and bunch lengths will range down to 1 ps in parts of the transport lattice. Accordingly, space charge in the injector and coherent synchrotron radiation in magnetic bends come into play. The machine will thus enable studying these phenomena as a precursor to designing compact accelerators of high-brightness beams. The FEL is scheduled to be installed in its own facility by 1 October 1997. Given the short schedule, the machine design is conservative, based on modifications of the CEBAF cryomodule and MIT-Bates transport lattice. This paper surveys the machine design. C1 TJNAF, Newport News, VA 23606 USA. RP Bohn, CL (reprint author), TJNAF, MS 89,12000 Jefferson Ave, Newport News, VA 23606 USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 909 EP 911 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800289 ER PT B AU Krafft, GA Jordan, K Kehne, D Benson, S Denard, J Feldl, E Piot, P Song, J Ursic, R AF Krafft, GA Jordan, K Kehne, D Benson, S Denard, J Feldl, E Piot, P Song, J Ursic, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Electron-beam diagnostics for Jefferson Lab's high power free electron laser SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In this paper the current plans for the diagnostic complement for Jefferson Lab's IRFEL are presented. Diagnostic devices include optical transition radiation beam viewers, both stripline and button beam position monitors, multislit beam emittance measuring devices, coherent synchrotron and transition radiation bunch length monitoring devices, and synchrotron light cameras for measuring the beam profile at high average power. Most devices have update rates of order 1 sec or shorter, and all are controlled through an EPICS control system. C1 TJNAF, Newport News, VA 23606 USA. RP Krafft, GA (reprint author), TJNAF, 12000 Jefferson Ave, Newport News, VA 23606 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 0-7803-4376-X PY 1998 BP 912 EP 914 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800290 ER PT B AU Wangler, TP Gray, ER Nath, S Crandall, KR Hasegawa, K AF Wangler, TP Gray, ER Nath, S Crandall, KR Hasegawa, K BE Comyn, M Craddock, MK Reiser, M Thomson, J TI New high power linacs and beam physics SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID HALO FORMATION AB New high-power proton Linacs must be designed to control beam loss, which can lead to radioactivation of the accelerator. The threat of beam loss is increased significantly by the formation of beam halo Numerical simulation studies have identified me space-charge interactions, especially those that occur in rms mismatched beams, as a major concern for halo growth. The maximum-amplitude predictions of the simulation codes must be subjected to independent tests to confirm the validity of the results. Consequently, we compare predictions from the particle-core halo models with computer simulations to test our understanding of the halo mechanisms that are incorporated in the computer codes. We present and discuss scaring laws that provide guidance for high-power linac design. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Wangler, TP (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 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 0-7803-4376-X PY 1998 BP 915 EP 919 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800291 ER PT B AU Cho, Y Chae, YC Crosbie, E Harkay, K Horan, D Kustom, R Lessner, E McDowell, W McGhee, D Moe, H Nielsen, R Norek, G Peterson, K Thompson, K Wang, J White, M AF Cho, Y Chae, YC Crosbie, E Harkay, K Horan, D Kustom, R Lessner, E McDowell, W McGhee, D Moe, H Nielsen, R Norek, G Peterson, K Thompson, K Wang, J White, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A 1- to 5-MW, RCS-based, short-pulse spallation neutron source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Two accelerator configurations, the linac/compressor ring scheme and the linac/RCS scheme, are commonly used to provide the proton beam power for a short-pulse spallation neutron source. In one configuration, a full-power linac provides the beam power and a compressor ring shortens the pulse length from I-ms down to 1 mu s. In the other, rapid cycling synchrotrons (RCSs) provide the beam power and also shorten the pulse length. A feasibility study of a staged approach to a 5-MW proton source utilizing RCS technology, allowing intermediate operation at 1 MW, was performed at ANL and is presented in this paper. This study is complementary to a study in progress at ORNL based on a linac and an accumulator ring. Our 1-MW facility consists of a 400-MeV injector linac that delivers 0.5-mA time-averaged current, a synchrotron that accelerates the beam to 2 GeV at a 30-Hz rate, and two neutron-generating target stations. In the second phase, the 2-GeV beam is accelerated to 10 GeV by a larger RCS, increasing the facility beam power to 5 MW. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Cho, Y (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 0-7803-4376-X PY 1998 BP 953 EP 955 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800301 ER PT B AU Blaskiewicz, M Ahrens, L Calvani, H AF Blaskiewicz, M Ahrens, L Calvani, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Anomalous, intensity dependent losses in Au(32+) beams SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Anomalous, intensity dependent losses in Au(32+) beams have been observed in the AGS Booster. No collective signal is expected, or observed, but increasing the number of injected ions decreases the beam lifetime. The loss rates for Au(32+) are compared with those for Au(15+). C1 Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. RP Blaskiewicz, M (reprint author), Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 959 EP 961 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800303 ER PT B AU Gardner, CJ Lee, YY Luccio, AU AF Gardner, CJ Lee, YY Luccio, AU BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Accumulator Ring lattice for the source National Spallation Neutron Source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Accumulator Ring for the proposed National Spallation Neutron Source (NSNS) [1] is to accept a 1.03 millisecond beam pulse from a 1 GeV Proton Linac at a repetition rate of 60 Hz. For each beam pulse, 10(14) protons are to be accumulated via charge-exchange injection. A 295 nanosecond gap in the beam, maintained by an rf system, will allow for extraction to an external target for the production of neutrons by spallation. This paper describes the four-fold symmetric lattice that has been chosen for the ring. The lattice contains four long dispersion-free straight sections to accomodate injection, extraction, rf cavities, and beam scraping respectively. The four-fold symmetry allows for easy adjustment of the tunes and flexibility in the placement of correction elements, and ensures that potentially dangerous betatron structure resonances are avoided. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Gardner, CJ (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 0-7803-4376-X PY 1998 BP 962 EP 964 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800304 ER PT B AU Glenn, JW Ahrens, L Hayes, T Lee, R AF Glenn, JW Ahrens, L Hayes, T Lee, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Mini-bunching the AGS slow external beam SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Test and modeling toward providing a continuos string of proton bursts of a few nano-seconds every 3 to 10 microseconds for the two second BNL AGS spill are presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Glenn, JW (reprint author), Brookhaven Natl Lab, POB 5000, 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 0-7803-4376-X PY 1998 BP 965 EP 966 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800305 ER PT B AU Glenn, JW Brennan, M Littenberg, L Rose, J Woody, C Zoltsman, A Bergbusch, P Mjka, D AF Glenn, JW Brennan, M Littenberg, L Rose, J Woody, C Zoltsman, A Bergbusch, P Mjka, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Micro-bunching the AGS Slow External Beam SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Measurements and modeling are presented on BNL's AGS operation of the stow External Beam with subnanosecond beam bunching for the full two second spill. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Glenn, JW (reprint author), Brookhaven Natl Lab, POB 5000, 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 0-7803-4376-X PY 1998 BP 967 EP 969 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800306 ER PT B AU Weng, WT Alessi, J Beebe-Wang, J Blaskiewicz, M Blumberg, L Brennan, M Gardner, C Lee, YY Luccio, AU Ludewig, H Maletic, D Raparia, D Ruggiero, A Zhang, SY AF Weng, WT Alessi, J Beebe-Wang, J Blaskiewicz, M Blumberg, L Brennan, M Gardner, C Lee, YY Luccio, AU Ludewig, H Maletic, D Raparia, D Ruggiero, A Zhang, SY BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Accumulator Ring design for the NSNS project SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The goal of the proposed National Spallation Neutron Source (NSNS) is to provide a short pulse proton beam of about 0.5 mu s with average beam power of 1MW. To achieve such purpose, a proton storage ring operated at 60Hz with I x 10(14) protons per pulse at 1GeV is required. The Accumulator Ring (AR) receives 1msec long H- beam bunches of 28mA from a 1GeV linac. Scope and design performance goals of the AR are presented, other possible technological choices and design options considered, but not adopted, are also briefly reviewed. C1 Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. RP Weng, WT (reprint author), Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 970 EP 972 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800307 ER PT B AU Chou, W AF Chou, W BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Intensity limitations in Fermilab Main Injector SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The design beam intensity of the FNAL Main Injector (MI) is 3 x 10(13) ppp. This paper investigates possible limitations in the intensity upgrade. These include the space charge, transition crossing, microwave instability, coupled bunch instability, resistive wall, beam loading (static and transient), rf power, aperture (physical and dynamic), coalescing, particle losses and radiation shielding, etc. It seems that to increase the intensity by a factor of two from the design value is straightforward. Even a factor of five is possible provided that the following measures are to be taken: an rf power upgrade, a gamma(t)-jump system, longitudinal and transverse feedback systems, rf feedback and feedforward, stopband corrections and local shieldings. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Chou, W (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. 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 0-7803-4376-X PY 1998 BP 991 EP 993 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800314 ER PT B AU Chou, W Brown, BC Fang, S Leibfritz, J Ng, KY Pfeffer, H Terechkine, I AF Chou, W Brown, BC Fang, S Leibfritz, J Ng, KY Pfeffer, H Terechkine, I BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design of a gamma(t)-jump system for Fermilab Main Injector SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In order to control the beam emittance and reduce the particle losses during the transition crossing at high intensity, a conceptual design of a gamma(t)-jump system for the FNAL Main Injector is presented. It is a first-order system employing local dispersion inserts at existing dispersion free straight sections. The goal is to provide a jump of Delta(gamma t) from +1 to -1 within 0.5 ms. The system consists of 8 sets of pulsed quadrupole triplets. These quads have pole tips of the hyperbolic shape and thin laminations. The power supply uses a GTO as the fast switch and a resonant circuit with a 1 kHz resonant frequency. The elliptical beamtube is made of Inconel 718, which has high electrical resistivity and high strength. Details of the lattice layout and subsystems design are presented. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Chou, W (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 994 EP 996 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800315 ER PT B AU Johnson, DE Mishra, CS Holmes, SD Gelfand, N Holt, JA Michelotti, L AF Johnson, DE Mishra, CS Holmes, SD Gelfand, N Holt, JA Michelotti, L BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design and simulation of the antiproton Recycler lattice SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Recycler is a new antiproton storage ring designed to improve antiproton production and allow recovery of antiprotons at the end of stores in the Fermilab Tevatron. The ring will be situated in the Main Injector enclosure, with a circumference of 3319 meters, and will operate at 8 GeV. The design of the Recycler utilizes permanent magnets. Lattice design considerations and performance modeling will be described. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Johnson, DE (reprint author), Fermi Natl Accelerator Lab, MS 323,POB 500, Batavia, IL 60510 USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 997 EP 999 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800316 ER PT B AU Ng, KY AF Ng, KY BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An imaginary-gamma(t) lattice with dispersion-free straights for the 50 GeV high-intensity proton synchrotron SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The 50 GeV proton synchrotron, proposed by the Institute of Nuclear Study of Japan (INS), requires zero-dispersion straight sections for polarized-beam operation. A new preliminary lattice that contains two straight sections with nonzero dispersion and two with zero dispersion is presented. The gamma(t) of the whole ring remains imaginary. Some uf analysis of the lattice is discussed. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ng, KY (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 1000 EP 1002 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800317 ER PT B AU Ng, KY AF Ng, KY BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Multiple injections with barrier buckets SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Multiple injections into the 50 GeV proton synchrotron, proposed by the Institute of Nuclear Study of Japan, from a 3 GeV booster using barrier buckets are simulated. For four successive injections of 4 bunches each time, having a half momentum spread of 0.5%, the final coasting beam in the synchrotron has a momentum spread of roughly +/-1.0% in the core, with a tail extending up to +/-2.5%. The choice of debunching time, barrier velocity, barrier voltage, and barrier width is analyzed. Some beam kinematics relating to the barrier buckets are discussed. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ng, KY (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 2 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1003 EP 1005 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800318 ER PT B AU O'Day, S Church, L AF O'Day, S Church, L BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The Fermilab Accumulator ring lattice upgrade SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Fermilab Antiproton Source Accumulator ring lattice will be changed to accommodate the planned upgrade of the Accumulator stacktail momentum cooling system. The bandwidth of the stacktail system will increase from 1-2 GHz to 2-4 GHz. This bandwidth change will provide the system with the additional cooling force necessary to stack a factor of two more flux than the present system. The lattice must be modified to halve the slip factor eta of the machine as a result. Reducing eta from .023 to -.012 will avoid the Schottky band overlap which causes excessive beam heating and will permit the use of conventional notch filters for gain shaping. The new eta will be achieved by replacing six high dispersion region quadrupoles and installing thirty-six quadrupole current shunts. Machine aperture, pickup to kicker phase advance and injection/extraction efficiency have not been compromised in the new lattice. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP O'Day, S (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1006 EP 1008 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800319 ER PT B AU Fitzgerald, DH Ahn, H Blind, B Borden, MJ Macek, RJ Neri, F Plum, MA Rose, CR Thiessen, HA Wilkinson, CA Zumbro, MV AF Fitzgerald, DH Ahn, H Blind, B Borden, MJ Macek, RJ Neri, F Plum, MA Rose, CR Thiessen, HA Wilkinson, CA Zumbro, MV BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Overview and status of the Los Alamos PSR injection upgrade project SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An upgrade is in progress to the Los Alamos Proton Storage Ring (PSR) to allow direct injection of the H- beam into the ring and provide a beam bump system to move the circulating beam off the stripper foil. The primary benefits of this upgrade are matching the transverse phase space of the injected beam to the PSR acceptance and reduction of foil hits by the circulating beam by a factor of ten. Foil thickness is optimized to minimize the combination of circulating-beam losses plus losses due to excited H-0 states produced at injection. An overall factor of five reduction in losses is expected. The project comprises extensive modifications of the injection line, the injection section of the ring, and the waste-beam transport fine. We will discuss the goals of the project, present an overview of the technical design, and describe the status of the implementation plan. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Fitzgerald, DH (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1012 EP 1014 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800321 ER PT B AU Wilkinson, C Neri, F Fitzgerald, DH Blind, B Macek, R Plum, M Sander, O Thiessen, HA AF Wilkinson, C Neri, F Fitzgerald, DH Blind, B Macek, R Plum, M Sander, O Thiessen, HA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Comparison of beam transport simulations to measurements at the Los Alamos Proton Storage Ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The ability to model and simulate beam behavior in the Proton Storage Ring (PSR) of the Los Alamos Neutron Science Center (LANSCE) is an important diagnostic and predictive tool. This paper gives the results of an effort to model the ring apertures and lattice and use beam simulation programs to track the beam. The results are then compared to measured activation levels from beam loss in the ring. The success of the method determines its usefulness in evaluating the effects of planned upgrades to the Proton Storage Ring. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Wilkinson, C (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 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 0-7803-4376-X PY 1998 BP 1015 EP 1017 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800322 ER PT B AU Galambos, JD Holmes, JA Olsen, DK AF Galambos, JD Holmes, JA Olsen, DK BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Accumulator ring H+ injection optimization studies SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB H- ion injection into an accumulator ring is a limiting process for future high-intensity pulsed spallation neutron sources. To facilitate the injection design process, a method has been developed to access a tracking code, ACCSIM [1], from within an optimization package [2]. The optimization tool is a C++ interactive driver with steepest decent and genetic algorithm optimization methods and parallel computing capabilities. Some injection parameters varied in the optimization process are the If beam size and position, the foil configuration and thickness, and the horizontal and vertical bump time profiles. Constraints and figures-of-merit include maximum allowed foil temperature, maximum allowed space charge tune shifts, maximum allowed foil traversals, and maximum allowed beam losses. Application of this method to accumulator ring injection in the proposed National Spallation Neutron Source (NSNS) is presented. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Galambos, JD (reprint author), Oak Ridge Natl Lab, 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 0-7803-4376-X PY 1998 BP 1018 EP 1020 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800323 ER PT B AU Trbojevic, D Brennan, JM Courant, ED Roser, T Peggs, S Ng, KY Johnstone, C Popovic, M Norem, J AF Trbojevic, D Brennan, JM Courant, ED Roser, T Peggs, S Ng, KY Johnstone, C Popovic, M Norem, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A proton driver for the Muon Collider source with a tunable momentum compaction lattice SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The future Muon Collider will have a luminosity of the order of 10(35) cm(-2-1) during 1000 turns when the muons decay. This requires 10(12) muons per bunch. The muon sourer is a 30 GeV proton driver with 2.5 10(13) protons per pulse. The proton bunch length should be of the order of 1 ns. Short bunches could be created by a tunable momentum compaction lattice which would bring the momentum compaction to zero in a short time. This isochronous condition would allow bunches to shear and become very short in time. We present a lattice where the momentum compaction is a tunable parameter at fixed horizontal and vertical betatron tunes. The values of the maxima of the dispersion function are kept small. We examine two kinds of lattices, with combined function as well as normal dipole and quadrupole magnets. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Trbojevic, D (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 0-7803-4376-X PY 1998 BP 1030 EP 1032 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800327 ER PT B AU Clark, DJ Collins, D Dwinell, R Guy, A Lundgren, S Lyneis, CM McMahan, MA Syversrud, D Xie, ZQ AF Clark, DJ Collins, D Dwinell, R Guy, A Lundgren, S Lyneis, CM McMahan, MA Syversrud, D Xie, ZQ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beams for Gammasphere at the LBNL 88-Inch Cyclotron SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The new transport system from the ss-Inch Cyclotron to the Gammasphere facility is described. Included are discussions of the ECR sources, operation, beam diagnostics, mechanical construction, vacuum system and beam optics. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Clark, DJ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd,Bldg 88, 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 0-7803-4376-X PY 1998 BP 1051 EP 1053 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800334 ER PT B AU Schrage, D Young, L Clark, W Davis, T Martinez, F Naranjo, A Roybal, P AF Schrage, D Young, L Clark, W Davis, T Martinez, F Naranjo, A Roybal, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A 6.7-MeV cw RFQ linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A 6.7-MeV 350 MHz, cw Radio Frequency Quadrupole proton linac has been designed and is being fabricated for the Accelerator Production of Tritium Project at Los Alamos. This eight-meter long structure consists of four resonantly-coupled segments and is being fabricated using hydrogen furnace brazing as a joining technology. Details of the design and status of fabrication are reported. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Schrage, D (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 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 0-7803-4376-X PY 1998 BP 1093 EP 1095 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800348 ER PT B AU Hoff, MD Fong, C Fong, M Staples, JW AF Hoff, MD Fong, C Fong, M Staples, JW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI NSNS RFQ mechanical design SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A 402.5 MHz, 6% duty factor RFQ is being designed for the National Spallation Neutron Source (NSNS). The 6% duty factor and RFQ length will present formidable design challenges. To this end, an RFQ materials test program is underway. A cold model test facility is being designed. Results of cooling calculations have begun. Plans for cavity construction, rf and vacuum seals, alignment, structural support and hot models are discussed. C1 Ernst Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Hoff, MD (reprint author), Ernst Orlando 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 0-7803-4376-X PY 1998 BP 1096 EP 1098 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800349 ER PT B AU Ruggiero, AG AF Ruggiero, AG BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A superconducting linac for the energy amplifier SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Because of the safer and more reliable mode of operation, a Superconducting Linac has been proposed as the proton beam accelerator which drives a nuclear plant based on the concept of the Energy,Amplifier, An example based on the net generation of 400 MW (electric) is described. This requires a proton beam energy of 1 GeV with a continuous beam current of 10 mA, corresponding to a beam power of 10 MW. Two frequencies cases, 360 and 805 MHz, have been considered for the Linac design. Performance and cost comparison for the two cases are given. C1 Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. RP Ruggiero, AG (reprint author), Brookhaven Natl Lab, AGS Dept, 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 0-7803-4376-X PY 1998 BP 1114 EP 1116 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800355 ER PT B AU Allison, P Moir, DC AF Allison, P Moir, DC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI BBU gain measurements on the ITS 6-MeV, 4-kA linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The amplification of transverse beam motion by the ITS eight-cell linear induction accelerator (LIA) was measured with a 4-kA beam at frequencies between 710- and 950-MHz. The 3.75-MeV injector beam was deflected with amplitudes of similar to 1 mrad by an RF-driven tunable cavity 84 cm before the linac. The centroid-position waveforms from calibrated B-dot loops were recorded with 5-GS/s digitizers at the linac entrance, exit, and after a further free drift of 108 cm. The FFT amplitudes of the waveforms were used to compute the gains. The code LAMDA, an envelope and BBU model for the linac, was used to interpret the gain curves, using the transverse impedances of the cells as adjustable parameters. The results compare favorably with cell impedances previously measured with a two-wire TSD method. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Allison, P (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 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 0-7803-4376-X PY 1998 BP 1138 EP 1140 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800363 ER PT B AU Allison, P Moir, DC AF Allison, P Moir, DC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Quadrupole image-current effects in the ITS 6-MeV, 4-kA linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The eight accelerating cells for the ITS linear induction accelerator (LIA) are driven with two 50-Omega lines at 250 kV for 60 ns. The wall return currents for the 4-kA beam then pass through these lines, generating a weak steady-state quadrupole field of similar to 3 G integrated strength on axis, which causes a small asymmetry in the nominally round beam at the linac exit. Beam-dynamics simulations with the particle-tracing code SCHAR show that if uncorrected, this would increase the beam emittance at the end of the DARHT 20-MeV linac, therefore quadrupole-corrector coils (QC) were added to each cell, in addition to the existing dipole steering coils. Measurements of the asymmetry of the ITS beam as a function of excitation current of these corrector coils are in good agreement with simulations, giving confidence that there will be negligible emittance degradation from this effect for DARHT. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Allison, P (reprint author), Univ Calif Los Alamos Natl Lab, 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 0-7803-4376-X PY 1998 BP 1141 EP 1143 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800364 ER PT B AU Allison, P Moir, DC Sullivan, G Hughes, TP AF Allison, P Moir, DC Sullivan, G Hughes, TP BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Observation of self-steering effects on the ITS 6-MeV linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Beam centroid oscillations were induced in the ITS eight-cell linear induction accelerator (LIA) by steering the beam near the entrance, and position measurements were then made at four locations through the linac. Measurements were in good agreement with code predictions, using the nominal accelerator values, for a collimated beam of similar to 0.3 kA, but to get reasonable agreement for the full 3-kA beam, it was necessary to increase the code value of injection voltage from its known value of similar to 3.7 MeV by similar to 300 kV, approximately the edge beam-potential depression (bpd). Subsequent simulations with the 3D PIC code LSP showed that centroid steering is described more accurately by the total rather than the kinetic energy of the beam. Modification of the beam dynamics code to eliminate the bpd resulted in good agreement with measurement for both 0.3- and 3-kA beams. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Allison, P (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 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 0-7803-4376-X PY 1998 BP 1144 EP 1146 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800365 ER PT B AU Bradley, J Cummings, K Lynch, M Rees, D Roybal, W Tallerico, P Toole, L AF Bradley, J Cummings, K Lynch, M Rees, D Roybal, W Tallerico, P Toole, L BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An overview of the Low Energy Demonstration Accelerator (LEDA) project RF systems SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Successful operation of the Accelerator Production of Tritium (APT)plant will require that accelerator downtime be kept to an absolute minimum. Over 230 separate I MW RF systems are expected to be used in the APT plant, making the efficiency and reliability of these systems two of the most critical factors in plant operation. The Low Energy Demonstration Accelerator (LEDA) being constructed at Los Alamos National Laboratory will serve as the prototype for APT. The design of the RF systems used in LEDA has been driven by the need for high efficiency and extremely high system reliability. We present details of the high voltage power supply and transmitter systems as well as detailed descriptions of the waveguide layout between the klystrons and the accelerating cavities. The first stage of LEDA operations will use four 1.2 MW klystrons to test the RFQ and supply power to one test stand. The RFQ will serve as a power combiner for multiple RF systems. We present some of the unique challenges expected in the use of this concept. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Bradley, J (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1147 EP 1149 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800366 ER PT B AU Chan, KCD Barber, RL Garnett, RW Gilpatrick, JD Johnson, KF Lawrence, GP Nath, S Regan, A Rybarcyk, L Shafer, RE Smith, HV Wangler, TP Young, LM Funk, LW Crandall, K AF Chan, KCD Barber, RL Garnett, RW Gilpatrick, JD Johnson, KF Lawrence, GP Nath, S Regan, A Rybarcyk, L Shafer, RE Smith, HV Wangler, TP Young, LM Funk, LW Crandall, K BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Commissioning plan for a high-current proton linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB High-power proton linacs (E>500 MeV) are potentially useful for transmutation applications, such as the production of tritium. In production applications, high availability is essential. Achieving high availability requires an accelerator design that simplifies maintenance and accommodates commissioning procedures designed to minimize tune-up time. These are worthwhile goals for any accelerator, but the high beam powers (170 MW) and heavy beam loading of the Accelerator Production of Tritium (APT) [1] linac introduce significant new challenges. This paper will describe the commissioning plan, as developed to date. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM kcchan@lanl.gov; gilpatrick@lanl.gov; glawrence@lanl.gov; snath@lanl.gov; lrybarcyk@lnal.gov; rshafer@lanl.gov; hvsmith@lanl.gov; twangler@lanl.gov; lyoung@lanl.gov; warren.funk@srs.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 0-7803-4376-X PY 1998 BP 1150 EP 1152 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800367 ER PT B AU Gray, ER Nath, S Wangler, TP AF Gray, ER Nath, S Wangler, TP BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Simulated performance of the superconducting section of the APT linac under various fault and error conditions SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The current design for the production of tritium uses both normal-conducting (NC) and super-conducting (SC) structures. To evaluate the performance of the superconducting part of the linac which constitutes more than 80% of the accelerator, studies have been made to include the effects of various error and fault conditions. Here, we present the simulation results of studies such as effects of rf phase and amplitude errors, cavity/klystron failure, quadrupole misalignment errors, quadrupole gradient error, and beam-input mismatches. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Gray, ER (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. 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 0-7803-4376-X PY 1998 BP 1153 EP 1155 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800368 ER PT B AU Lawrence, GP Wangler, TP AF Lawrence, GP Wangler, TP BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Integrated normalconducting/superconducting high-power proton linac for the APT Project SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The baseline accelerator design for the APT (Accelerator Production of Tritium) Project [I] is a normalconducting-superconducting proton linac that produces a CW beam power of 170 MW at 1700 MeV. Compared with the previous all-NC linac design, the NC/SC linac provides significant power savings and lower operating and capital costs. It allows a much larger aperture at high energies, and permits greater operational flexibility. The design has been approved by high-level technical panels and is published in a Conceptual Design Report [2], The high-energy portion is a superconducting (SC) rf linac employing elliptical-type niobium cavities, while the low-energy portion is a normal-conducting (NC) linac constructed from copper cavities, This provides an integrated accelerator design that makes optimum use of the two technologies in their appropriate regions of application. The NC linac, which consists of an injector, RFQ, CCDTL, and CCL, accelerates a 100-mA beam to 217 MeV. The SC linac is built in two sections optimized for different beam velocity spans, with each section made up of cryomodules containing 5-cell cavities and SC singlet quads in a FODO focusing lattice. Alternate SC linac designs are being studied that employ a doublet focusing lattice using conventional quadrupoles located between cryomodules. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM glawrence@lanl.gov; twangler@lanl.gov 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 0-7803-4376-X PY 1998 BP 1156 EP 1158 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800369 ER PT B AU Macek, RJ Browne, JC Brun, T Donahue, JB Fitzgerald, DH Pynn, R Schriber, SO Weinacht, D AF Macek, RJ Browne, JC Brun, T Donahue, JB Fitzgerald, DH Pynn, R Schriber, SO Weinacht, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Overview of progress on the improvement projects for the LANSCE accelerator and target facilities SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Three projects have been initiated since 1994 to improve the performance of the accelerator and target facilities for the Los Alamos Neutron Science Center (LANSCE). The LANSCE Reliability Improvement Project (LRIP) was separated into two phases. Phase I, completed in 1995, targeted near-term improvements to beam reliability and availability that could be completed in one-year's time. Phase II, now underway and scheduled for completion in May 1998, consists of two projects: a) implementation of direct H- injection for the Proton Storage Ring (PSR) and b) an upgrade of the target/moderator system for the short pulse spallation neutron (SPSS) source. The latter will reduce the target change-out time from about 10 months to about three weeks. The third project, the SPSS Enhancement Project, is aimed at increasing the PSR output beam current to 200 mu A at 30 Hz and providing up to seven new neutron scattering instruments. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Macek, RJ (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, 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 0-7803-4376-X PY 1998 BP 1159 EP 1161 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800370 ER PT B AU Nath, S Crandall, KR Gray, ER Wangler, TP Young, LM AF Nath, S Crandall, KR Gray, ER Wangler, TP Young, LM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam dynamics aspects for the APT integrated linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The accelerator-based production of tritium calls for a high-power cw proton linac. The current Los Alamos design uses an integrated approach in terms of accelerating structure. The front part of the accelerator uses normal-conducting (NC) structures while most (>80%) of the linac structure is superconducting (SC). Here, we report the beam-dynamics rationale used in the integrated design and present particle simulation results. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Nath, S (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1162 EP 1164 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800371 ER PT B AU Callaway, NT Garnett, RW Jones, KW Oothoudt, MA Ray, BD AF Callaway, NT Garnett, RW Jones, KW Oothoudt, MA Ray, BD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Availability results for the LANSCE accelerator complex SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The results of an analysis of operations data from the 1996 run-cycle of the LANSCE accelerator complex will be presented. Frequency and history of operational events including system and component failures which affect beam availability have been tracked. Some of the significant downtime incidents will be described and analyzed in detail. These results will be used to improve future operations and beam availability. C1 Univ Calif Los Alamos Natl Lab, LANSCE Div, Los Alamos, NM 87545 USA. RP Callaway, NT (reprint author), Univ Calif Los Alamos Natl Lab, LANSCE Div, 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 0-7803-4376-X PY 1998 BP 1165 EP 1167 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800372 ER PT B AU Schneider, JD Chan, KCD AF Schneider, JD Chan, KCD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Progress update on the low-energy demonstration accelerator (LEDA) SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB As part of the linac design for the accelerator production of tritium (APT) project, we are assembling the first approximately 20 MeV portion of this cw proton accelerator. Primary objective of this low-energy demonstration accelerator (LEDA) is to verify the design codes, gain fabrication knowledge, understand LEDA's beam operation, and be able to better predict costs and operational availability for the full 1700 MeV APT accelerator. This paper provides an updated report on this past year's progress that includes beam tests of the 75 keV injector, fabrication of the 6.7 MeV radio-frequency quadrupole (RFQ), preparation of the facility, procurement and assembly of the rf system, and detailed design and documentation of many pieces of support equipment. First tests with the 6.7 MeV, 100 mA, cw beam from the RFQ are scheduled for late 1998. References are given to many detailed papers on LEDA at this conference. C1 Los Alamos Natl Lab, APT Project Off, Los Alamos, NM 87545 USA. RP Los Alamos Natl Lab, APT Project Off, POB 1663, Los Alamos, NM 87545 USA. EM idschneider@lanl.gov; kcchan@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 0-7803-4376-X PY 1998 BP 1168 EP 1170 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800373 ER PT B AU Takeda, H Billen, JH Nath, S AF Takeda, H Billen, JH Nath, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Physics design of the National Spallation Neutron Source linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The National Spallation Neutron Source (NSNS) requires a linac that accelerates a H- beam to 1.0 GeV. The NSNS linac starts with a radio-frequency quadrupole (RFQ) accelerator, which is followed by a drift-tube linac (DTL), a coupled-cavity drift-tube linac (CCDTL), and conventional coupled-cavity linac (CCL). In this paper, we focus on the DTL, CCDTL, and CCL parts of the accelerator. We discuss the linac design parameters and beam dynamics issues. The design rationale of no separate matching sections between different accelerating sections maintains the current independence of beam behavior. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Takeda, H (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1171 EP 1173 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800374 ER PT B AU Staples, JW AF Staples, JW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The NSNS front end accelerator system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The National Spallation Neutron Source (NSNS) front-end accelerator comprises a 65 keV LEBT, a 2.5 MeV RFQ and a matching accelerating a 55 mA PT beam with a 6% duty factor. Critical design issues are the 6% beam duty factor, the 5 free space-wavelength long 402.5 MHz RFQ, and nanosecond chopping of the beam before it enters the first DTL. The conceptual design of the front-end systems will be presented, with experimental validation of some of the proposed subsystems. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Staples, JW (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1174 EP 1176 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800375 ER PT B AU Bailey, JD Olsen, DK AF Bailey, JD Olsen, DK BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A proposed superconducting booster linac for the HRIBF SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A 42 MV Superconducting (SC) Booster Linac is proposed for the Holifield Radioactive Ion Beam Facility (HRIBF). The linac, consisting of 56 superconducting, quarter wave, 120 MHz, independently phased, 2 gap resonators, will be used to boost Radioactive Ion Beams (RIBs) accelerated by the 25 MV NEC tandem, to Coulomb barrier energies for use in nuclear physics research near the proton and neutron drip lines. The design potential of 42 MV is sufficient to boost the beams of mass 180 above the Coulomb barrier using the most probable charge state, 15+, from single foil stripping in the tandem terminal. Linac parameters and layout are presented with accompanying beam dynamic calculations. in addition, an upgrade of the existing pre- tandem beam bunching system is proposed to further preserve the RIB intensity through better longitudinal phase space matching into the linac. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP Bailey, JD (reprint author), Oak Ridge Natl Lab, POB 2008,Bldg 6000, Oak Ridge, TN 37830 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1177 EP 1179 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800376 ER PT B AU Graves, WS Ben-Zvi, I Johnson, ED Krinsky, S Skaritka, J Woodle, MH Yu, LH Raubenheimer, TO AF Graves, WS Ben-Zvi, I Johnson, ED Krinsky, S Skaritka, J Woodle, MH Yu, LH Raubenheimer, TO BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design of the Source Development Lab bunch compressor SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The accelerator at the Source Development Lab at BNL consists of a 1.6 cell RF photocathode electron gun followed by a 230 MeV SLAG-type linac that includes a magnetic chicane bunch compressor. The nominal specifications call for a 10 ps FWHM bunch of 2nC charge to be compressed in time by a factor of 25 at an energy of 85 MeV. The design of the compressor magnets and the beam dynamics from the gun through the magnetic chicane are described. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. RP Graves, WS (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source, 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 0-7803-4376-X PY 1998 BP 1197 EP 1199 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800383 ER PT B AU Tatum, BA AF Tatum, BA CA HRIBF Operat Staff BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Development of the Holifield Radioactive Ion Beam Facility SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Holifield Radioactive Ion Beam Facility (HRIBF) construction project has been completed and the first radioactive ion beam has been successfully accelerated. The project, which began in 1992, has involved numerous facility modifications. The Oak Ridge Isochronous Cyclotron has been converted from an energy booster for heavy ion beams to a light ion accelerator with internal ion source. A target-ion source and mass analysis system have been commissioned as key components of the facility's radioactive ion beam injector to the 25MV tandem electrostatic accelerator. Beam transport lines have been completed, and new diagnostics for very low intensity beams have been developed. Work continues on a unified control system. Development of research quality radioactive beams for the nuclear structure and nuclear astrophysics communities continues. This paper details facility development to date. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Tatum, BA (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 0-7803-4376-X PY 1998 BP 1227 EP 1229 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800393 ER PT B AU Kwan, JW AF Kwan, JW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Experiments in heavy ion fusion beam physics at LBNL, LLNL, and the University of Maryland SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID CHARGE AB A heavy ion fusion driver must be capable of accelerating an intense ion beam to GeV beam energies. The final beam pulse current can be as high as a few kA using beam compression in an induction linac. Combining beamlets at low energy may prove to be economical as long as there is no significant emittance growth. Focusing of the final beam pulse from the reactor chamber wall to the target can be enhanced by using a plasma channel to guide the ion beam. Experiments at LBNL on ion sources, injector, the combiner and plasma channel focusing are discussed. One possible way to reduce the cost of a driver is to use an induction recirculator. Experiments at LLNL are exploring this concept by studying the transport and bending of space-charge-dominated ion beams. At the Univ. of Maryland the behavior of space-charge dominated beams is being simulated with low-energy electrons. They studied emittance growth, halo formation and beam pulse compression. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Kwan, JW (reprint author), Lawrence Berkeley Lab, MS 47-112,1 Cyclotron Rd, Berkeley, CA 94720 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 0-7803-4376-X PY 1998 BP 1230 EP 1234 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800394 ER PT B AU Spielman, RB Stygar, WA Struve, KW Seamen, JF AF Spielman, RB Stygar, WA Struve, KW Seamen, JF BE Comyn, M Craddock, MK Reiser, M Thomson, J TI PBFA Z: A 55 TW 4.5 MJ electrical generator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB PBFA Z is a new 55 TW/4.5 MJ short pulse electrical driver located at Sandia National Laboratories. We use PBFA Z to magnetically-implode plasma shells. These configurations are historically known as z pinches. The pulsed power design of PBFA Z[1] is based on conventional single-pulse Marx generator, water-line pulse-forming technology used on the earlier Saturn[2] and PBFA II[3] accelerators. PBFA Z stores 11.4 MJ in its 36 Marx generators, couples 4.5 MJ in 55-TW/105-ns pulse to the output water transmission lines, and delivers up to 3.0 MJ and 40 TW of electrical energy to the z-pinch load. Depending on the initial load inductance and the implosion time, we attain peak currents of 16-20MA with a rise time of 105 ns. Current is fed to the z-pinch load through self magnetically-insulated transmission lines (MITLs). Peak electric fields in the MITLs exceed 2 MV/cm. The current from the four independent conical disk MITLs is combined together in a double post-hole vacuum convolute with an efficiency greater than 95%. The measured system performance of the water transmission lines, the vacuum insulator stack, the MITLs, and the double post-hole vacuum convolute differed from preshot predictions by similar to 5%. Using a 2-cm radius and a 2-cm length tungsten wire array with 240, 7.5-mu m diameter wires (4.1-mg mass) as the z-pinch load, we achieved xray powers of 200 TW and x-ray energies of 1.85 MJ as measured by x-ray diodes and resistive bolometry. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Spielman, RB (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 5 TC 0 Z9 0 U1 0 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1235 EP 1239 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800395 ER PT B AU Grote, DP Friedman, A Lund, SM Haber, I AF Grote, DP Friedman, A Lund, SM Haber, I BE Comyn, M Craddock, MK Reiser, M Thomson, J TI 3D particle simulations of space-charge-dominated beams in HIF accelerator experiments SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The development of a high current, heavy-ion beam driver for inertial confinement fusion requires a detailed understanding of the behavior of the beam, including effects of the large self-fields. This necessity makes particle-in-cell (PIC) simulation the appropriate tool, and for this reason, the three-dimensional PIC/accelerator code WARP3d is being developed. WARP3d has been used extensively to study the creation and propagation of ion beams both to support experiments and for the understanding of basic beam physics. An overview of the structure of the code is presented along with a discussion of features that make the code an effective tool in the understanding of space-charge dominated beam behavior. A number of applications where WARP3d has played an important role is discussed, emphasizing the need of three-dimensional, first principles simulations. Results and comparisons with experiment are presented. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Grote, DP (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-440, Livermore, CA 94550 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 0-7803-4376-X PY 1998 BP 1240 EP 1244 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800396 ER PT B AU Mazarakis, MG Poukey, JW Maenchen, JE Rovang, DC Menge, PR Lash, JS Smith, DL Halbleib, JA Cordova, SR Mikkelson, K Gustwiller, J Stygar, WA Welch, DR Smith, I Corcoran, P AF Mazarakis, MG Poukey, JW Maenchen, JE Rovang, DC Menge, PR Lash, JS Smith, DL Halbleib, JA Cordova, SR Mikkelson, K Gustwiller, J Stygar, WA Welch, DR Smith, I Corcoran, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Experiments investigating the generation and transport of 10-12 MeV, 30-kA, mm-size electron beams with linear inductive voltage adders SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We present the design, analysis, and results of the high-brightness electron beam experiments currently under investigation at Sandia National Laboratories. The anticipated beam parameters are the following: energy 8-12 MeV, current 35-50 kA, rms radius 0.5 mm, and pulse duration 30-60 ns FWHM. The accelerators utilized are SABRE and HERMES III. Both are linear inductive voltage adders (IVA) modified to higher impedance and fitted with magnetically immersed foilless electron diodes. In the strong 20-50 Tesla solenoidal magnetic field of the diode, mm-size electron beams are generated and propagated to a beam stop. The electron beam is field emitted from mm-diameter needle-shaped cathode electrode and is contained in a similar size envelope by the strong magnetic field. These extremely space charge dominated beams provide the opportunity to study beam dynamics and possible instabilities in a unique parameter space. The SABRE experiments are already completed and have produced 30-kA, 1.5-2.5 FWHM electron beams, while the HERMES-III experiments are currently under way. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM mgmazar@sandia.gov; drwelch@or66.com 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 0-7803-4376-X PY 1998 BP 1245 EP 1247 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800397 ER PT B AU Caporaso, GJ AF Caporaso, GJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Linear induction accelerator approach for advanced radiography SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Recent advances in induction accelerator technology make it possible to envision a single accelerator that can serve as an intense, precision multiple pulse x-ray source for advanced radiography. Through the use of solid-state modulator technology repetition rates on the order of 1 MHz can be achieved with beam pulse lengths ranging from 200 ns to 2 mu secs. By using fast kickers, these pulses may be sectioned into pieces which are directed to different beamlines so as to interrogate the object under study from multiple lines of sight. The ultimate aim is to do a time dependent tomographic reconstruction of a dynamic object. The technology to accomplish these objectives along with a brief discussion of the experimental plans to verify it will be presented. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Caporaso, GJ (reprint author), Univ Calif 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 BN 0-7803-4376-X PY 1998 BP 1248 EP 1250 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800398 ER PT B AU Weir, JT Caporaso, GJ Clark, JC Kirbie, HC Chen, YJ Lund, SM Westenskow, GA Paul, AC AF Weir, JT Caporaso, GJ Clark, JC Kirbie, HC Chen, YJ Lund, SM Westenskow, GA Paul, AC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI ETA II experiments for determining advanced radiographic capabilities of induction linacs SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB LLNL has proposed a multi- pulsed, multi-line of sight radiographic machine based on induction linac technology to be the core of the advanced hydrotest facility (AHF) being considered by the Department of Energy. In order to test the new technologies being developed for AHF we have recommissioned the Experimental Test Accelerator (ETA TT). We will conduct our initial experiments using kickers and large angle bending optics at the ETA II facility. Our current status and our proposed experimental schedule will be presented. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Weir, JT (reprint author), Univ Calif Lawrence Livermore Natl Lab, 7000 East Ave,L-535, 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 0-7803-4376-X PY 1998 BP 1260 EP 1262 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800402 ER PT B AU Fuja, R Grelick, AE Meyer, D Pile, G White, M AF Fuja, R Grelick, AE Meyer, D Pile, G White, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Constant-current charging supplies for the advanced photon source (APS) linear accelerator modulators SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The APS [1,2] linac beam energy must be stable to within +/-1% to match the energy acceptance of the positron accumulator ring. The klystron pulse modulators [3,4] must therefore provide a pulse-to-pulse repeatability of 0.1% in order for the beam to have the required energy stability. The modulators have had difficulty achieving the necessary repeatability since the pulse forming network (PFN) charging scheme does not include a deQing circuit. Several of the major charging circuit components are also less reliable than desired. In order to increase operating reliability and to improve pulse-to-pulse stability, it is planned to replace the high voltage power supplies in all modulators with constant-current power supplies. A new modulator charging supply that contains two EMI [5] series 303 constant-current power supplies was constructed. Each of these EMI supplies delivers 1.5 A at up to 40 kV. One supply is sufficient for linac operation at up to 45 Hz, and two supplies in parallel enable linac operation at the nominal rf repetition rate of 60 Hz. This paper discusses test results from the new modulator, and also describes the existing modulators and their performance limitations. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. EM mwhite@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 0-7803-4376-X PY 1998 BP 1269 EP 1271 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800405 ER PT B AU Jensen, C Qunell, D AF Jensen, C Qunell, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A thyratron trigger with low jitter SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A very low jitter trigger is required for the Main Injector Proton Injection kicker. The trigger is also designed to be reliable against thyratron are down to the trigger grid. The trigger uses a wide band coaxial cable transformer that operates at 1500 V with a 500 ns purse width and a 10% -90% rise time of 20 ns. An FET is used as the switch and a very low inductance capacitor is used to store the trigger energy. Typical total jitter between TTL trigger pulse and the 50% load current value has been measured at < 2 ns over a period of 8 hours and 10(5) pulses. About half this jitter is attributed to the trigger system, and the other half to the thyratron. The trigger has been subjected to several thyratron sparks without problem. The paper will present the trigger schematic, waveforms, components and the thyratron connections. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Jensen, C (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 1281 EP 1283 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800409 ER PT B AU Jensen, CC AF Jensen, CC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A 40 kV, 3.1 Omega PFN for the Main Injector abort kicker SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Main Injector abort kicker system has been run at full voltage. The system was required to operate with a PFN to meet specifications. The system was designed to operate in air to allow for easier maintenance. The topology chosen has the thyratron cathode grounded, a grounded PFN and a floating pulse transformer. The system is also required to have low EMI because of the proximity of low level controls. Several problems related to the pulse transformer and to operation in air are addressed and some solutions are presented. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Jensen, CC (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-4376-X PY 1998 BP 1284 EP 1286 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800410 ER PT B AU Qunell, D Jensen, C Tinsley, D AF Qunell, D Jensen, C Tinsley, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Kicker system for 8 GeV proton injection SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This kicker functions to inject 6 batches of 8 GeV beam vertically into the Fermilab Main Injector from the Booster. The trajectory of this beam must be bent 1.05 mr to place it onto equilibrium orbit. This kicker system produces a nominal integrated field kick of 0.309 kG-m. Specifications require a 1.6 microsecond pulse with a 50 ns risetime (1%-99%) and a 150 ns falltime (99%-5%). The system is comprised of three magnets and power supplies. Each is composed of a resonant charger, a 25 Omega PFL, a thyratron-based pulsed power supply, a ferrite "C" magnet, and a Fluorinert(TM)-cooled resistive load. Design details and measurements are presented. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Qunell, D (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1287 EP 1289 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800411 ER PT B AU Rose, CR Shafer, RE AF Rose, CR Shafer, RE BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A 200-A, 500-Hz, triangle current-wave modulator and magnet used for particle beam rastering SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper describes a simple 2D beam-rastering system to uniformly spread a 100-mA 6.7-MeV cw proton beam over a 50-cm by 50-cm beam stop. The basic circuit uses a 20-mF capacitor bank, a IGBT (insulated gate bipolar transistor) full-wave inverter, and a 1-mH ferrite dipole magnet to produce a +/- 500-Gauss peak triangular-waveform deflection field at 500 Hz. A de input voltage of 200 volts at 2.6 amps (520 watts) produces a 160-ampere peak-to-peak triangular current waveform in the ferrite magnet at 500 Hz. For dual-axis rastering, two ferrite dipoles are used, one at 500 Hz, and the other at 575 Hz, to produce a uniform 2D beam distribution at the beam stop. The paper will discuss the IGBT modulator and ferrite deflector in detail, including current and voltage waveforms, and the ferrite magnet B-dot (dB/dt) signal. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Rose, CR (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1293 EP 1295 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800413 ER PT B AU Berners, DP Reginato, LL AF Berners, DP Reginato, LL BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Arbitrary waveform generator for electrostatic dipoles in a heavy ion recirculator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Lawrence Berkeley National Laboratory is working in close collaboration with the Lawrence Livermore National Laboratory in the investigation of using a recirculating induction accelerator as a driver for Heavy Ion Fusion. The deflection dipoles in the recirculator require precise high voltage electrical waveforms. These waveforms are of a parabolic shape and rise to a peak voltage level of 28 kV in 240 mu s A voltage reference is generated internally which is completely adjustable through the computer. The voltage reference is compared to the output voltage and the error signal drives a purse width modulator carrier frequency of 100 kHz. The high frequency carrier is stepped up with five stages of ferrite transformers, rectifiers and filters to generate a completely adjustable waveform of up to 28 kV which follows the computer generated voltage reference. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Berners, DP (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1296 EP 1298 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800414 ER PT B AU Chen, YJ Caporaso, GJ AF Chen, YJ Caporaso, GJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A novel design for a high power superconducting delay line SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Potential designs for a high power superconducting delay line of approximately 10ms duration are described. The transmitted signal should have low dispersion and little attenuation to recapture the original signal. Such demands cannot be met using conventional metal conductors. This paper outlines a proposal for a new transmission line design using low temperature superconducting material which meets system specifications. The 25W line is designed to carry pulsed signals with an approximate rise time of 8nsec and a maximum voltage magnitude of 25kV. Predicted electrical design and performance of the line will be presented. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Chen, YJ (reprint author), Univ Calif Lawrence Livermore Natl Lab, L-440,POB 808, Livermore, CA 94550 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1305 EP 1307 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800417 ER PT B AU Sampayan, SE Caporaso, GJ Sanders, DM Stoddard, RD Trimble, DO Elizondo, J Krogh, ML Wieskamp, TF AF Sampayan, SE Caporaso, GJ Sanders, DM Stoddard, RD Trimble, DO Elizondo, J Krogh, ML Wieskamp, TF BE Comyn, M Craddock, MK Reiser, M Thomson, J TI High-performance insulator structures for accelerator applications SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A new, high gradient insulator technology has been developed for accelerator systems. The concept involves the use of alternating layers of conductors and insulators with periods of order 1 mm or less. These structures perform many times better (about 1.5 to 4 times higher breakdown electric field) than conventional insulators in long pulse, short pulse, and alternating polarity applications, we describe our ongoing studies investigating the degradation of the breakdown electric field resulting from alternate fabrication techniques, the effect of gas presssure, the effect of the insulator-to-electrode interface gap spacing, and the performance of the insulator structure under bi-polar stress. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Sampayan, SE (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 10 TC 0 Z9 1 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1308 EP 1310 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800418 ER PT B AU de Lamare, J Donaldson, A Kulikov, A Lipari, J AF de Lamare, J Donaldson, A Kulikov, A Lipari, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The PEP-II abort kicker system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The PEP-II project has two storage rings. The HER (High Energy Ring) has up to 1.48 A of electron beam at 9 GeV, and the LER (Low Energy Ring) has up to 2.14 A of positron beam at 3.1 GeV. To protect the HER and LER beam lines in the event of a ring component failure, each ring has an abort kicker system which directs the beam into a dump when a failure is detected. Due to the high current of the beams, the beam kick is tapered from 100% to 80% in 7.33 mu S (the beam transit time around the ring). This taper distributes the energy evenly across the window which separates the ring from the beam dump such that the window is not damaged. The abort kicker trigger is synchronized with the ion clearing gap of the beam allowing for the kicker field to rise from 0-80% in 370nS. This report discusses the design of the system controls, interlocks, power supplies, and modulator. C1 Stanford Linear Accelerator Ctr, Menlo Park, CA 94020 USA. RP de Lamare, J (reprint author), Stanford Linear Accelerator Ctr, 2575 Sand Hill Rd, Menlo Park, CA 94020 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 0-7803-4376-X PY 1998 BP 1316 EP 1318 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800421 ER PT B AU Koontz, R Akemoto, M Gold, S Krasnykh, A Wilson, Z AF Koontz, R Akemoto, M Gold, S Krasnykh, A Wilson, Z BE Comyn, M Craddock, MK Reiser, M Thomson, J TI NLC klystron pulse modulator R & D at SLAC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The basic elements of a klystron pulse modulator are: a charging supply, a PFN with energy storage capacitors, a thyratron switch tube, and a pulse transformer. The design group mentioned above is working on the system requirments of an NLC modulator, is carrying out tests on components, and building a prototype NLC modulator of conventional, but optimized design. A PFN using Russian K15-10 type high energy density glass capacitors has been constructed and tested into a conventional pulse transformer and klystron load. Rise time is less than 400 nsec. Developmental work with thyratron manufacturers is being started. Similarly, R&D pulse transformers developed in cooperation with industry are being tested. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Koontz, R (reprint author), Stanford Linear Accelerator Ctr, POB 4349,Bin 33, Stanford, CA 94309 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1319 EP 1321 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800422 ER PT B AU Akemoto, M Gold, S Krasnykh, A Koontz, R AF Akemoto, M Gold, S Krasnykh, A Koontz, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Development of the pulse transformer for NLC klystron pulse modulator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We have studied a conventional pulse transformer for the NLC klystron pulse modulator. The transformer has been analyzed using a simplified lumped circuit model. It is found that a fast rise time requires low leakage inductance and low distributed capacitance and can be realized by reducing the number of secondary turns, but it produces larger pulse droop and core size. After making a tradeoff among these parameters carefully, a conventional pulse transformer with a rise time of 250ns and a pulse droop of 3.6% has been designed and built. The transmission characteristics and pulse time-response were measured. The data were compared with the model. The agreement with the model was good when the measured values were used in the model simulation. The results of the high voltage tests are also presented. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Akemoto, M (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1322 EP 1324 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800423 ER PT B AU Assmann, RW AF Assmann, RW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam dynamics in SLC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Beam dynamics issues affect many different aspects of the SLC performance. This paper concentrates on the multi-particle beam dynamics in the linac and the associated limitations that are imposed on the overall SLC performance. The beam behavior in the presence of strong wakefields has been studied in order identify ways to optimize the performance and to predict the expected emittances in high performance linacs. Emittance measurements and simulations are presented for the SLAG linac and are compared in detail. As the overall SLC performance depends on the accelerator stability, the tuning stability is discussed. Results are shown and the consequences for the performance of the SLC are discussed. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Assmann, RW (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1331 EP 1335 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800426 ER PT B AU Irwin, J AF Irwin, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Analytic nonlinear methods for beam optics SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In recent years there have been major advances in the computation and use of high-order maps for the design, optimization and operation of beamlines. We will describe five practical examples for both linear and circular colliders. C1 SLAC, Menlo Park, CA 94025 USA. RP Irwin, J (reprint author), SLAC, 2575 Sand Hill Rd, Menlo Park, CA 94025 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 0-7803-4376-X PY 1998 BP 1341 EP 1345 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800428 ER PT B AU Douglas, DR AF Douglas, DR BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Lattice design for a high-power infrared FEL SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A 1 kW infrared FEL for industrial, defense, and related scientific applications, is being built at Jefferson Lab. It will be driven by a compact energy-recovering CW superconducting radio-frequency (SRF) linear accelerator. Stringent phase space requirements at the wiggler, low beam energy, and high beam current subject the design to numerous constraints. This report addresses these issues and presents a design solution for an accelerator transport lattice meeting the requirements imposed by physical phenomena and operational necessities. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Douglas, DR (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 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 0-7803-4376-X PY 1998 BP 1351 EP 1355 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800430 ER PT B AU Teng, LC AF Teng, LC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Global and local horizontal-vertical decoupling SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In this paper we investigate systematically the global and local effects of horizontal-vertical couplings on the beam and the measurement and control of these couplings. Piecemeal studies have been made on these subjects by different authors [1, 2, 3]. For completeness, their results are integrated here wherever appropriate. This brings the understanding and execution of the coupling correction to the same degree of completeness as that of the closed orbit correction. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Teng, LC (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 1359 EP 1361 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800432 ER PT B AU Trbojevic, D Courant, E AF Trbojevic, D Courant, E BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A standard FODO lattice with adjustable momentum compaction SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An existing lattice made of identical FODO cells can be modified to have adjustable momentum compaction. The modified lattice consists of repeating superperiods of three FODO cells where the cells have different horizontal phase advances, This allows tuning of the momentum compaction or yt (transition) to any desired value. A value of the yt could be an imaginary number. A drawback of this modification is relatively large values of the dispersion function (two or three times larger than in the regular FODO cell design). This scheme also requires an additional quad bus for the modified cells. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Trbojevic, D (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 0-7803-4376-X PY 1998 BP 1371 EP 1372 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800436 ER PT B AU Mottershead, CT Zumbro, JD AF Mottershead, CT Zumbro, JD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Magnetic optics for proton radiography SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB High energy protons of 10 to 50 GeV can be used to radiograph dense objects. Because the transmitted beam particles undergo multiple coulomb scattering (MCS) in the object, a magnetic lens system is used to focus the particles exiting each point of the object onto a distant image plane. Without the lens, the MCS would seriously blur the radiographic image. Correlations can be introduced in the illuminating beam to cancel a major part of the chromatic and geometric aberrations in the lens, while providing locations inside the lens where the rays are sorted by MCS angle. This allows the introduction of angle cut apertures to aid material identification. The requirement for a matched multistage lens system with successively smaller angle-cut apertures leads to the use of minus-identity (-I) lenses, in which the angle sorting is in the longitudinal mid plane of the lens, and the exit beam correlations are the same as the input correlations. A single stage -I lens has been successfully tested at Brookhaven with 10-GeV protons and another is being used in dynamic experiments with 0.8-GeV protons at Los Alamos. The resolution achievable at higher energies is briefly surveyed. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Mottershead, CT (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 5 TC 6 Z9 7 U1 0 U2 5 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1397 EP 1399 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800445 ER PT B AU Parzen, G AF Parzen, G BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Orbit dynamics for unstable linear motion SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A treatment is given of the orbit dynamics for linear unstable motion that allows for the zeros in the beta function and makes no assumptions about the realness of the betatron and phase functions. The phase shift per turn is shown to be related to the beta function and the number of zeros the beta function goes through per turn. The solutions of the equations of motion are found in terms of the beta function. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Parzen, G (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 0-7803-4376-X PY 1998 BP 1421 EP 1423 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800453 ER PT B AU Parzen, G AF Parzen, G BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Particle motion inside and near a linear half-integer stopband SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper studies the motion of a particle whose tune is inside and near a linear half-integer stopband. Results are found for the tune and beta functions in the stable region close to an edge of the stopband. It is shown that the eigenvalues and the eigenfunctions of the transfer matrix are real inside the stopband. All the results found are also valid for small accelerators where the large accelerator approximation is not used. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Parzen, G (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1424 EP 1426 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800454 ER PT B AU Parzen, G AF Parzen, G BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Particle motion in the stable region near the edge of a linear sum resonance stopband SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper studies the particle motion when the tune is in the stable region close to the edge of linear sum resonance stopband. Results are found for the tune and the beta functions. Results are also found for the two solutions of the equations of motion. The results found are shown to be also valid for small accelerators where the large accelerator approximation may not be used. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Parzen, G (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 0-7803-4376-X PY 1998 BP 1427 EP 1429 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800455 ER PT B AU Parzen, G AF Parzen, G BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The linear parameters and the decoupling matrix for linearly coupled motion in 6 dimensional phase space SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB It will be shown that starting from a coordinate system where the 6 phase space coordinates are linearly coupled, one can go to a new coordinate system, where the motion is uncoupled, by means of a linear transformation, The original coupled coordinates and the new uncoupled coordinates are related by a 6 x 6 matrix, R. It will be shown that of the 36 elements of the 6 x 6 decoupling matrix R, only 12 elements are independent. A set of equations is given from which the 12 elements of R can be computed from the one period transfer matrix. This set of equations also allows the linear parameters, the beta(i), alpha(i), i = 1,3, for the uncoupled coordinates, to be computed from the one period transfer matrix. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Parzen, G (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 0-7803-4376-X PY 1998 BP 1430 EP 1432 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800456 ER PT B AU Donald, MHR Cai, Y Shoaee, H White, G AF Donald, MHR Cai, Y Shoaee, H White, G BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An orbit and dispersion correction scheme for PEP-II SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A scheme of simultaneously correcting the orbits and dispersion has been implemented in the simulation code [1] and on-line control system [2] for PEP-II [3]. The scheme is based on the eigenvector decomposition method. An important ingredient of the scheme is to choose the optimum eigenvectors that minimize the orbit, dispersion and corrector strength. Simulations indicate this to be a very effective way to control the vertical residual dispersion. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Donald, MHR (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1454 EP 1456 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800464 ER PT B AU Huang, H Ahrens, L Alessi, JG Bai, M Brown, KA Bunce, G Cameron, P Ingrassia, P Kponou, AE Krueger, K Lee, SY Luccio, AU Makdisi, YI Mariam, F Okamura, M Ratner, L Reece, K Roser, T Sato, H Spinka, HM Tsoupas, N Underwood, DG van Asselt, W Williams, NW Yokosawa, A AF Huang, H Ahrens, L Alessi, JG Bai, M Brown, KA Bunce, G Cameron, P Ingrassia, P Kponou, AE Krueger, K Lee, SY Luccio, AU Makdisi, YI Mariam, F Okamura, M Ratner, L Reece, K Roser, T Sato, H Spinka, HM Tsoupas, N Underwood, DG van Asselt, W Williams, NW Yokosawa, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Overcoming weak intrinsic depolarizing resonances with energy-jump SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In the recent polarized proton runs in the AGS, a 5% partial snake was used successfully to overcome the imperfection depolarizing resonances. polarized proton beam was accelerated up to the required RHIC injection energy of 25 GeV. However, significant amount of polarization was lost at 0+v(v), 12+v(y) and 36+v(y), which is believed to be partially due to the coupling resonances. To overcome the coupling resonance, an energy-jump was generated by rapidly changing the beam circumference using the powerful AGS rf system. It clearly demonstrates that the novel energy-jump method can successfully overcome coupling resonances and weak intrinsic resonances. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Huang, H (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1460 EP 1462 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800466 ER PT B AU Shiltsev, VD AF Shiltsev, VD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam dynamics with noise in superferric very large hadron collider ("Pipetron") SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We study transverse and longitudinal beam dynamics in "Pipetron" collider under influence of external noises. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Shiltsev, VD (reprint author), Fermi Natl Accelerator Lab, POB 500,MS-345, Batavia, IL 60510 USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1475 EP 1477 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800471 ER PT B AU Terebilo, A Pellegrini, C Cornacchia, M Corbett, J Martin, D AF Terebilo, A Pellegrini, C Cornacchia, M Corbett, J Martin, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A measurement of the variation of machine parameters and the effect of the power supplies ripple on the instantaneous tunes at SPEAR SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID HAMILTONIAN-SYSTEMS AB For long term stability analysis time variation of tunes is important. We have proposed and tested a technique for measuring the magnitude of this variation. This was made possible by using tune extraction algorithms that require small number of turns thus giving an instantaneous tune of the machine. In this paper we demonstrate the measured effect of the tune modulation with 60 Hz power supplies ripple, power line interference from SLAG linac operating at 30 Hz repetition rate, and nonperiodic variation. C1 Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Terebilo, A (reprint author), Univ Calif Los Angeles, Los Angeles, CA 90024 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 0-7803-4376-X PY 1998 BP 1490 EP 1492 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800476 ER PT B AU Bizek, HM AF Bizek, HM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Some results of the advanced photon source beam lifetime studies SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Total beam lifetime consists of two components: the residual-gas-scattering lifetime and Touschek lifetime. The residual-gas lifetime is comprised of the elastic and inelastic scattering on electrons and elastic and inelastic scattering on nuclei. Touschek scattering involves scattering of particles within the bunch. One usually calculates only the elastic scattering on nuclei (single Coulomb scattering) and inelastic scattering on nuclei (bremsstrahlung) of the residual-gas-scattering lifetime component. Experience gained from computing the beam lifetime in the Advanced Photon Source (APS) storage ring shows that the electron scattering should not be neglected, particularly the inelastic contribution. Given the measured quantities from the APS storage ring, one can compare theoretical predictions with experimental results. Uncertainties in calculating the various contributions to lifetime will be discussed. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Bizek, HM (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1493 EP 1495 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800477 ER PT B AU Bizek, HM AF Bizek, HM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The extended Touschek lifetime SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Scattering of particles within the bunch is called Touschek scattering. If large enough, such an energy transfer may eject the particle out of the bunch. If a particle is scattered in the dispersive region, it will induce a horizontal betatron oscillation which will be coupled into vertical motion when it passes through skew components. The amount of coupling is expressed in terms of the coupling coefficient, chi. If the coupling coefficient is large enough, the resulting vertical oscillations may exceed the normally small vertical admittance of the ring. Thus the particles may be lost even though the energy loss is within the momentum acceptance. The lifetime associated with this loss mechanism is called the extended Touschek lifetime. In the usual Touschek lifetime calculation, the lifetime increases as the coupling increases. Including the effect of the vertical oscillation results in a decrease of Touschek lifetime beyond some coupling value. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Bizek, HM (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 1496 EP 1498 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800478 ER PT B AU Byrd, JM Cheng, WH Zimmermann, F AF Byrd, JM Cheng, WH Zimmermann, F BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Nonlinear longitudinal dynamics studies at the ALS SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We present an account of our efforts to understand unexpected observations in the course of performing measurements of the longitudinal beam transfer function. As the amplitude of excitation was increased, we observed a notch in the middle of the peak amplitude response of the transfer function. Our observations are explained by a bifurcation in the amplitude due to the nonlinearity of the oscillations, demonstrated by measurements of the longitudinal bunch profile using a streak camera. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Byrd, JM (reprint author), Lawrence Berkeley Lab, 1 Cyclotron Rd, 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 0-7803-4376-X PY 1998 BP 1514 EP 1516 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800484 ER PT B AU Assmann, RW Chao, A AF Assmann, RW Chao, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Dispersion in the presence of strong transverse wakefields SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB To minimize emittance growth in a long linac, it is necessary to control the wakefields by correcting the beam orbit excursions. In addition, the particle energy is made to vary along the length of the bunch to introduce a damping, known as the BNS damping, to the beam break-up effect. In this paper, we use a two-particle model to examine the relative magnitudes of the various orbit and dispersion functions involved. The results are applied to calculate the effect of a closed orbit bump and a misaligned structure. It is shown that wake-induced dispersion is an important contribution to the beam dynamics in long linacs with strong wakefields like SLC. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Assmann, RW (reprint author), Stanford Univ, 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 0-7803-4376-X PY 1998 BP 1523 EP 1525 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800487 ER PT B AU Neuffer, D AF Neuffer, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam dynamics problems for a mu(+)-mu(-) collider SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID MU AB A mu(+)-mu(-) collider requires a high-intensity proton source for pi-production, a high-acceptance pi-mu decay channel, a mu-cooling system, a rapid acceleration system, and a high-luminosity collider ring for the collision of short, intense mu(+)-mu(-) bunches. Significant beam-dynamics problems exist in each of these systems. These problems and some paths to solutions are discussed in this paper. C1 Fermilab Astrophys Ctr, Batavia, IL 60510 USA. RP Neuffer, D (reprint author), Fermilab Astrophys Ctr, POB 500, Batavia, IL 60510 USA. 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 0-7803-4376-X PY 1998 BP 1537 EP 1541 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800491 ER PT B AU Blaskiewicz, M AF Blaskiewicz, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Effects of incoherent space charge forces on the fast head-tail instability SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The effects of incoherent space charge forces on the fast head-tail instability are studied numerically. It is found that incoherent space charge forces can dramatically increase the threshold current for a fixed wall impedance. C1 Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. RP Blaskiewicz, M (reprint author), Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1554 EP 1556 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800496 ER PT B AU Byrd, J Chao, A Heifets, S Minty, M Raubenheimer, TO Seeman, J Stupakov, G Thomson, J Zimmermann, F AF Byrd, J Chao, A Heifets, S Minty, M Raubenheimer, TO Seeman, J Stupakov, G Thomson, J Zimmermann, F BE Comyn, M Craddock, MK Reiser, M Thomson, J TI First observations of a "fast beam-ion instability" at the ALS SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We report the results of experiments on a "fast beam-ion instability"[1] at the Advanced Light Source (ALS). This ion instability, which can arise even when the ions are not trapped over multiple beam passages, will likely be important for many future accelerators. In our experiments, we filled the ALS storage ring with helium gas, raising the pressure approximately two orders of magnitude above the nominal pressure. With gaps in the bunch train large enough to avoid conventional (multi-turn) ion trapping, we observed a factor of 2-3 increase in the vertical beam size along with coherent beam oscillations which increased along the bunch train. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Byrd, J (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1563 EP 1565 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800499 ER PT B AU Minty, MG Akre, R Decker, FJ Turner, J AF Minty, MG Akre, R Decker, FJ Turner, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Operation and performance of bunch precompression for increased current transmission at the SLC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB As the beam currents at the SLC are increased, transverse aperture restrictions in the ring-to-linac transport line (RTL) become increasingly important. The RTL contains a bunch compressor which introduces a large energy variation across the bunch and hence a larger transverse beam size. Since 1994 the compressor amplitude has been operating at higher than design voltage. While advantangeous for shaping the bunch distribution, this increased the bunch energy spread and therefore resulted in more beam loss. Moreover, due to current-dependent bunch lengthening in the damping ring, the higher the beam current, the more the current loss. To avoid such losses, the bunch length may be precompressed in the damping ring. Until recently, bunch precompression with high beam currents was not stable. In this paper we identify the reasons for the difficulties, describe the changes made to accomodate bunch precompression, and discuss performance aspects after implementation. The estimated increase in current at the interaction point is 15%. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Minty, MG (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1569 EP 1571 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800501 ER PT B AU Harkay, KC Nassiri, A Song, JJ Kang, YW Kustom, RL AF Harkay, KC Nassiri, A Song, JJ Kang, YW Kustom, RL BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Compensation of longitudinal coupled-bunch instability in the advanced photon source storage ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A longitudinal coupled-bunch (CB) instability was encountered in the 7-GeV storage ring. This instability was found to depend on the bunch fill pattern as well as on the beam intensity. The beam spectrum exhibited a coupled-bunch signature, which could be reproduced by an analytical model. The oscillations were also observed on a horizontal photon monitor. The beam fluctuations exhibited two periodicities, which were found to be correlated with the rf cavity temperatures. This correlation is consistent with the measured temperature dependence of the higher-order mode (HOM) frequencies [1]. The HOM impedance drives the beam when brought into resonance with the CB mode by the temperature variation. Increasing the inlet cavity water temperature suppressed the instability. The experimental results are compared to an analytical model which characterizes the fill-pattern dependence. Studies to identify the offending HOMs are also presented. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Harkay, KC (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1575 EP 1577 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800503 ER PT B AU Ruggiero, AG Blaskiewicz, M AF Ruggiero, AG Blaskiewicz, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Fast transverse instability in the NSNS accumulator ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper reports on the results of investigation of possible fast transverse instabilities in the NSNS Accumulator Ring. The instability may be caused by the presence of stripline devices like kicker magnets, the active damper system, and by the RF cavities, and the sharp steps of the vacuum pipe. The instability can be overcome by adopting aluminum as the material of the vacuum chamber, and by smoothing the shape of the vacuum pipe. Still the growth time of the instability remains short especially for the mode in proximity of the betatron tune. C1 Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. RP Ruggiero, AG (reprint author), Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1578 EP 1580 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800504 ER PT B AU Ruggiero, AG Blaskiewicz, M AF Ruggiero, AG Blaskiewicz, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI e-p instability in the NSNS accumulator ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB It has been speculated that the intensity limitation observed in the Los Alamos Proton Storage Ring (PSR) is caused by a coherent instability [1] induced by the presence of pockets of electrons generated by scattering with the molecules of the vacuum residual gas. A theoretical explanation of the e-p instability of course does exist [2], and is similar to the one developed for the ion-induced instability in electron storage rings. Considering the large beam power (2 MW) involved in the NSNS Accumulator Ring [3], and the consequences caused by even a small amount of beam loss, we need to carefully assess the effects of electrons that may be generated in the vacuum chamber. C1 Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. RP Ruggiero, AG (reprint author), Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1581 EP 1583 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800505 ER PT B AU Zhang, SY AF Zhang, SY BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Microwave instability thresholds SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Taking the first orthogonal polynomials in the conventional radial mode expansion in the eigenvalue type perturbation approach, the usual Keil-Schnell criteria for the microwave instabilities can be obtained. In this way, a close relationship between the two approaches is established. The existing results are reviewed, and some comments and modifications are made. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Zhang, SY (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 0-7803-4376-X PY 1998 BP 1584 EP 1586 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800506 ER PT B AU Bhat, CM MacLachlan, JA AF Bhat, CM MacLachlan, JA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam intensity limits in the main injector through transition with a normal phase jump scheme SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Fermilab Main Injector, which is under construction, will be a high intensity proton synchrotron and will be capable of accelerating (decelerating) protons and antiprotons from 8.9 GeV/c to 150 GeV/c (150 GeV/c to 8.9 GeV/c). Presently, the plan is to accelerate or decelerate the beam through the transition energy of 20.49 GeV, using basic normal phase jump scheme. Efficient deceleration of (p) over bar through the Main Injector is crucial for the success of the Recycler Ring Project. We have performed extensive longitudinal beam dynamics simulations for both modes of operation to determine the beam intensity limits and other properties. We present the latest results of calculation and their implications. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Bhat, CM (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1590 EP 1592 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800508 ER PT B AU Plum, MA Fitzgerald, DH Johnson, D Langenbrunner, J Macek, RJ Merrill, F Morton, P Prichard, B Sander, O Shulze, M Thiessen, HA Wang, TS Wilkinson, CA AF Plum, MA Fitzgerald, DH Johnson, D Langenbrunner, J Macek, RJ Merrill, F Morton, P Prichard, B Sander, O Shulze, M Thiessen, HA Wang, TS Wilkinson, CA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Recent experimental evidence for the Los Alamos Proton Storage Ring beam instability SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The peak intensity of the PSR is limited by a fast transverse instability. In 1996 we started a project to upgrade the PSR to 200 mu A at 30 Hz, which requires operation above the instability threshold achieved with our present rf system. We have, therefore, resumed our experimental program to understand and control the instability. In this paper we will present our latest data. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Plum, MA (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 2 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1611 EP 1613 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800515 ER PT B AU Furman, MA Lambertson, GR AF Furman, MA Lambertson, GR BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The electron-cloud instability in PEP-II: An update SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID BEAM AB We present an update on the estimate of the growth time of the multi-bunch transverse instability in the PEP-II collider arising from the interaction of the positron beam with the accumulated electron cloud. We estimate the contributions to the growth rate arising from the dipole magnets and from the pumping straight sections. We emphasize those quantities upon which the instability is most sensitive. The simulation includes measured data on the secondary emission yield for TiN-coated samples of the actual vacuum chamber. Although our analysis is still in progress, we conclude that the instability risetime is of order 1 ms, which is well within the range controllable by the feedback system. C1 LBNL, Berkeley, CA 94720 USA. RP Furman, MA (reprint author), LBNL, MS 71-259, 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 0-7803-4376-X PY 1998 BP 1617 EP 1619 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800517 ER PT B AU Heifets, S AF Heifets, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Saturation of the ion transverse instability SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Fast Ion Instability is studied in the nonlinear regime. It is shown that exponential growth of the linear regime is replaced in this case by the linear dependence on time. Numeric and analytical results are presented describing the beam profile and the beam spectrum in both regimes. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Heifets, S (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1620 EP 1622 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800518 ER PT B AU Krejcik, P AF Krejcik, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A coupled-bunch ion instability in the SLC electron damping ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Under abnormally poor vacuum conditions in the electron damping ring, described in a companion paper at this conference, an emittance blowup was observed related to a transverse instability. The instability was only observed with two bunches in the ring, and could not be seen with single bunch operation, even at the same total beam current as for the two bunches. Measurements of the transverse Beam Transfer Function indicate strong coupling between the two bunches when ions are present. This is described in terms of a simple model where the oscillating ion cloud provides the coupling between the two bunches. The frequency shift due to coupling can also cause the ion cloud to become unstable, and disappear, when the betatron tune of the electron bunch is just below the 1/2 integer. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Krejcik, P (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 1623 EP 1625 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800519 ER PT B AU Krejcik, P Pritzkau, D Raubenheimer, T Ross, M Zimmermann, F AF Krejcik, P Pritzkau, D Raubenheimer, T Ross, M Zimmermann, F BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Ion effects in the SLC electron damping ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We report on the ion-related beam behavior in the electron damping ring during unusually poor vacuum conditions in the weeks that followed a catastrophic kicker chamber failure that contaminated the ring vacuum system. The vacuum gradually improved over several months of beam operation, during which time the vertical emittance remained blown up by a factor of 2. The emittance blowup was accompanied by a transverse instability that produced jitter in the extracted beam size. Both the characteristic spectrum of serf-excited betatron sidebands and the emittance blowup exhibited a threshold behavior with beam current and vacuum pressure. This behavior depended strongly on the betatron tune and it was found that the ion effects could be minimized by operating just below the 1/2 integer resonance. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Krejcik, P (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 1626 EP 1628 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800520 ER PT B AU Podobedov, BV Siemann, RH AF Podobedov, BV Siemann, RH BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Saw-tooth instability studies in the Stanford linear collider damping rings SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Experimental results of the instability studies are being reported. The system built gives a BPM-derived single bunch 'instability signal'. The signal was recorded simultaneously with the longitudinal density bunch profiles obtained from the synchrotron light with the high resolution Hamamatsu streak camera. Correlation of the instability signal with the streak camera profiles has been found. For the strongly developed instability state the dominant mode structure was obtained. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM boris@slac.stanford.edu 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 0-7803-4376-X PY 1998 BP 1629 EP 1631 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800521 ER PT B AU Stupakov, GV AF Stupakov, GV BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Fast ion instability in real lattice SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The ionization of residual gas by an electron beam in an accelerator generates ions that can resonantly couple to the beam through a wave propagating in the beam-ion system. The original theory of the Fast Ion Instability [1, 2] was developed assuming both a constant external focusing and the beam size. The theory predicts an instability in which an initial perturbation grows as similar to exp(alpha root t). In the present paper we consider a more realistic model that takes into account variation of the beta function in the lattice and associated with it variation of the beam size. We find that, in combination with ion decoherence effect, the spatial inhomogeneity can result in 1) purely exponential growth, similar to exp(Gamma t), and 2) typically smaller growth rates. Detailed calculations are performed for the lattice of the Advanced Light Source at the LBL. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Stupakov, GV (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, POB 4349, Stanford, CA 94309 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1632 EP 1634 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800522 ER PT B AU Stupakov, GV Breizman, BN Pekker, MS AF Stupakov, GV Breizman, BN Pekker, MS BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Nonlinear dynamics of single bunch instability SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A nonlinear equation is derived that governs the evolution of the amplitude of unstable oscillations with account of quantum diffusion effects due to the synchrotron radiation. Numerical solutions to this equation predict a variety of possible scenarios of nonlinear evolution of the instability some of which are in good qualitative agreement with experimental observations. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Stupakov, GV (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, POB 4349, 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 0-7803-4376-X PY 1998 BP 1635 EP 1637 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800523 ER PT B AU Li, R Bohn, CL Bisognano, JJ AF Li, R Bohn, CL Bisognano, JJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Shielded transient self-interaction of a bunch entering a circle from a straight path SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB When a short (mm-length) bunch with high (nC-regime) charge is transported through a magnetic bending system, self-interaction via coherent synchrotron radiation (CSR) and space charge may alter the bunch dynamics significantly. We consider a Gaussian rigid-line-charge bunch following a straight-path trajectory into a circle, with the trajectory centered between two infinite, parallel, perfectly conducting plates. Transients associated with CSR and space charge generated from source particles both on the straight path and the circle are calculated, and their net effect on the radiated power is contrasted with that of shielded steady-state CSR. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Li, R (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1641 EP 1643 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800525 ER PT B AU Li, R Bohn, CL Bisognano, JJ AF Li, R Bohn, CL Bisognano, JJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Analysis on the steady-state coherent synchrotron radiation with strong shielding SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB There are several papers concerning shielding of coherent synchrotron radiation (CSR) emitted by a Gaussian line charge on a circular orbit centered between two parallel conducting plates. Previous asymptotic analyses in the frequency domain show that shielded steady-state CSR mainly arises from harmonics in the bunch frequency exceeding the threshold harmonic for satisfying the boundary conditions at the plates. In this paper we extend the frequency-domain analysis into the regime of strong shielding, in which the threshold harmonic exceeds the charcteristic frequency of the bunch. The result is then compared to the shielded steady-state CSR power obtained using image charges. C1 TJNAF, Newport News, VA 23606 USA. RP Li, R (reprint author), TJNAF, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1644 EP 1646 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800526 ER PT B AU Wang, TF Machida, S Mori, Y Ohmori, C AF Wang, TF Machida, S Mori, Y Ohmori, C BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Equivalent circuit study of beam-loading using a moment method SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In this work, we present a formalism by considering the perturbations in the moments of a bunched beam for the equivalent circuit model to include all harmonics of-the synchrotron oscillation in a beam-cavity interaction system. The linear coupling among all longitudinal modes under the influence of a narrow-band impedance can be naturally incorporated in this new approach. We used this method to re-examine the coupling between the dipole and the quadrupole modes. The dispersion relation obtained by this new method was compared with that derived from the linearized Vlasov equation up to the second harmonic of the synchrotron motion. We found excellent qualitative agreements between these two approaches. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Wang, TF (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, 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 0-7803-4376-X PY 1998 BP 1670 EP 1672 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800535 ER PT B AU Adolphsen, CE Bane, KLF Spence, WL Woodley, MD AF Adolphsen, CE Bane, KLF Spence, WL Woodley, MD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Collective centroid oscillations as an emittance preservation diagnostic in linear collider linacs SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Transverse bunch centroid oscillations, induced at operating beam currents at which transverse wakefields are substantial, and observed at Beam Position Monitors, are sensitive to the actual magnetic focusing, energy gain, and rf phase profiles in a linac, and are insensitive to misalignments and jitter sources. In the 'pulse-stealing' set-up implemented at the SLC, they thus allow the frequent monitoring of the stability of the in-place emittance growth inhibiting or mitigating measures-primarily the energy scaled magnetic lattice and the rf phases necessary for BNS damping-independent of the actual emittance growth as driven by misalignments and jitter. We have developed a physically based analysis technique to meaningfully reduce this data. Oscillation beta-beating is a primary indicator of beam energy errors; shifts in the 'invariant' amplitude reflect differential internal motion along the longitudinally extended bunch and thus are a sensitive indicator of the real rf phases in the machine; shifts in betatron phase advance contain corroborative information sensitive to both effects. Examples from initial SLC applications illustrate the method. Differential internal motion due to intra-bunch energy or amplitude spread, or bunch spatial extension which makes collective or multiparticle interactions possible, causes striking differences between the behavior of the centroid of a bunched beam, which is measured by a beam position monitor, and a single particle. Bunch inhomogeneities that respond differentially to the beamline environment engender decoherence, and possibly recoherence and echo phenomena; current dependent collective effects can strongly excite novel patterns of centroid motion. We first discuss general aspects of the difference between centroid and single particle mechanics in the context of developing a general parameterization scheme for the former, and then move to some more specific features of beam dynamics with transverse wakefields. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94305 USA. RP Adolphsen, CE (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94305 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 0-7803-4376-X PY 1998 BP 1673 EP 1675 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800536 ER PT B AU Adolphsen, C Lavine, T Nantista, C Ruth, R Wang, J Yeremian, D AF Adolphsen, C Lavine, T Nantista, C Ruth, R Wang, J Yeremian, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam loading compensation in the NLCTA SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In the design of the Next Linear Collider (NLC), multi-bunch operation is employed to improve efficiency at the cost of substantial beam loading. The RF pulse that powers the accelerator structures will be shaped to compensate for the effect of the transient loading along the bunch train. This scheme has been implemented in the Next Linear Collider Test Accelerator (NLCTA), a facility built to test the key accelerator technology of the NLC. In this paper we describe the compensation method, the techniques used to measure the energy variation along the bunch train, and results from tests with NLC-like beam currents. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Adolphsen, C (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 2 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1676 EP 1678 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800537 ER PT B AU Emma, P Brinkmann, R AF Emma, P Brinkmann, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Emittance dilution through coherent energy spread generation in bending systems SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB For a bunched beam, coherent energy spread generated within a bending system may couple to the transverse (bending) plane coordinates through the chromatic transfer functions of the particular beamline-even an achromatic beamline. The resulting transverse emittance dilution is dependent on the magnitude of the energy spread, its generation rate along the beamline, and the beamline's chromatic transfer functions. The coherent energy spread may be due to resistive-wall wakefields or coherent synchrotron radiation. For specific beamlines, such as a periodic are or wiggler, the longitudinal-to-transverse coupling is minimal and, in ideal cases, completely suppressed resulting in reduction or cancellation of all transverse emittance dilution effects. This is of particular interest for micro-bunch transport or compression systems such as exist in future FEL or linear collider projects. C1 SLAC, Stanford, CA 94309 USA. RP Emma, P (reprint author), SLAC, MS 66,PO Box 4349, 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 0-7803-4376-X PY 1998 BP 1679 EP 1681 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800538 ER PT B AU Heifets, S Sabbi, G AF Heifets, S Sabbi, G BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Single bunch stability in PEP-II LER SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The note describes results of studies of the single bunch stability in the low energy ring (LER) of the PEP-II B-factory[?]. Simulations describe the potential well distortion (PWD) obtained by numerical solution of the Haiisinski equation[?] and results on the beam stability obtained with the code TRISIM[?]. Both longitudinal and transverse wake fields are taken into account. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Heifets, S (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1682 EP 1684 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800539 ER PT B AU Stupakov, GV AF Stupakov, GV BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Geometrical wake of a smooth flat collimator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A transverse geometrical wake generated by a beam passing through a smooth flat collimator with a gradually varying gap between the upper and lower walls is considered. Based on generalization of the approach recently developed for a smooth circular taper [1] we reduce the electromagnetic problem of the impedance calculation to the solution of two much simpler static problems - a magnetostatic and an electrostatic ones. The solution shows that in the limit of not very large frequencies, the impedance increases with the ratio h/d where h is the width and d is the distance between the collimating jaws. Numerical results are presented for the NLC Post Linac collimator. 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 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1685 EP 1687 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800540 ER PT B AU Stupakov, GV AF Stupakov, GV BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Synchrotron radiation wake in free space SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A transverse force acting on particles of a short bunch coherently radiated in free space is derived. 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 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 0-7803-4376-X PY 1998 BP 1688 EP 1690 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800541 ER PT B AU Yunn, BC Merminga, L AF Yunn, BC Merminga, L BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam breakup in a microtron SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In a microtron, the path length change from pass to pass is a fixed multiple of the RF wavelength, and the accelerating system can be reasonably well approximated as a single cavity. Under such circumstances it is possible to derive an analytical formula for the multipass beam breakup threshold current. The threshold current determined by numerical simulations agrees very well with the formula for a machine with a small number of passes. The analytic formula can serve as a useful guide in examining optics designs to improve the BBU threshold. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Yunn, BC (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1694 EP 1696 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800543 ER PT B AU Sereno, NS Chae, YC Harkay, KC Lumpkin, AH Milton, SV Yang, BX AF Sereno, NS Chae, YC Harkay, KC Lumpkin, AH Milton, SV Yang, BX BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A potpourri of impedance measurements at the advanced photon source storage ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Machine coupling impedances were determined in the APS storage ring from measurements of the bunch length, synchronous phase, and synchrotron and betatron tunes vs single-bunch current. The transverse measurements were performed for various numbers of small gap insertion device (ID) chambers installed in the ring. The transverse impedance is determined from measurements of the transverse tunes and bunch length as a function of single-bunch current. The shift in the synchrotron tune was measured as a function of bunch current from which the total cavity impedance was extracted. The loss factor was determined by measuring the relative synchronous phase as a function of bunch current. The longitudinal resistive impedance is calculated using the loss factor dependence on the bunch length. From these results, we can estimate what the impedance would be for a full set of ID chambers. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Sereno, NS (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 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 0-7803-4376-X PY 1998 BP 1700 EP 1702 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800545 ER PT B AU Hahn, H Ratti, A AF Hahn, H Ratti, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The coupling impedance of the RHIC injection kicker system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In this paper, results from impedance measurements on the RHIC injection kickers are reported. The kicker is configured as a "C" cross section magnet with interleaved ferrite and high-permittivity dielectric sections to achieve a travelling wave structure. The impedance was measured using the wire method in which a resistive match provides a smooth transition from the network analyzer to the reference line in the set-up. Accurate results are obtained by interpreting the forward scattering coefficient via the log-formula. The four kickers with their ceramic beam tubes contribute a Z/n = 0.22 Omega/ring in the interesting frequency range from 0.1 to 1 GHz, and less above. At frequencies above similar to 100 MHz, the impedance is ferrite dominated and not affected by the kicker terminations. Below 100 MHz, the Blumlein pulser with the similar to 75 m feeding cables is visible in the impedance but makes no significant contribution to the results. The measurements show that the kicker coupling impedance is tolerable without the need for impedance reducing measures. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Hahn, H (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 0-7803-4376-X PY 1998 BP 1706 EP 1708 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800547 ER PT B AU Capista, D McGinnis, D Steimel, J Kourbanis, I Still, D AF Capista, D McGinnis, D Steimel, J Kourbanis, I Still, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Controlling the resistive wall instability in the Fermilab Main Ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Fermilab Main Ring has a strong transverse instability identified as a resistive wall(1). Previous methods of dealing with this problem have primarily been to find settings of tune, chromaticity, and octupole that result in stable operation. Controling this instability in this manner has had limited success and reduces beam lifetime. A new damper system has been installed in the Main Ring to control this instability. This damper effectively provides a negative impedance to the accelerator to cancel the effects of the resistive wall. With this damper in operation we have been able to adjust the tune, chromaticity, and octupole settings to improve beam efficiency without becoming unstable due to the resistive wall of the accelerator. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Capista, D (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 1721 EP 1723 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800552 ER PT B AU Chou, W Griffin, J AF Chou, W Griffin, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Impedance scaling and impedance control SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB When a machine becomes really large, such as the Very Large Hadron Collider (VLHC),[I] of which the circumference could reach the order of megameters, beam instability could be an essential bottleneck. This paper studies the scaling of the instability threshold vs. machine size when the coupling impedance scales in a "normal" way. It is shown that the beam would be intrinsically unstable for the VLHC. As a possible solution to this problem, it is proposed to introduce local impedance inserts for controlling the machine impedance. In the longitudinal plane, this could be done by using a heavily detuned rf cavity (e.g., a biconical structure), which could provide large imaginary impedance with the right sign (i.e., inductive or capacitive) while keeping the real part small. In the transverse direction, a carefully designed variation of the cross section of a beam pipe could generate negative impedance that would partially compensate the transverse impedance in one plane. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Chou, W (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 1724 EP 1726 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800553 ER PT B AU Kurennoy, SS AF Kurennoy, SS BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam coupling impedances of obstacles protruding into beam pipe SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID FINITE THICKNESS; HOLE; WALL; PENETRATION; FIELDS AB The beam coupling impedances of small obstacles protruding inside the vacuum chamber of an accelerator are calculated analytically at frequencies for which the wavelength is large compared to a typical size of the obstacle. Simple formulas for a few important particular cases, including both essentially three-dimensional objects like a post or a mask and axisymmetric irises, are presented. The analytical results are compared and agree with three-dimensional computer simulations. These results allow simple practical estimates of the broad-band impedance contributions from such discontinuities. C1 Univ Calif Los Alamos Natl Lab, LANSCE 1, Los Alamos, NM 87545 USA. RP Kurennoy, SS (reprint author), Univ Calif Los Alamos Natl Lab, LANSCE 1, POB 1663,MS H808, Los Alamos, NM 87545 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 0-7803-4376-X PY 1998 BP 1732 EP 1734 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800556 ER PT B AU Bane, KLF Ng, CK Chao, AW AF Bane, KLF Ng, CK Chao, AW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Estimate of the impedance due to wall surface roughness SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID BEAM PIPE 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 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1738 EP 1740 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800558 ER PT B AU Minty, MG Zimmermann, F AF Minty, MG Zimmermann, F BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Longitudinal beam-transfer-function measurements at the SLC damping rings SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A longitudinal single-bunch instability[1] in the damping rings at the Stanford Linear Collider (SLC) is thought to contribute to pulse-to-pulse orbit variations in downstream accelerator sections. To better understand this instability, we measured the beam phase and bunch length under harmonic modulations of the rf phase and rf voltage. For small phase-modulations the measured response can be explained by interaction of the beam with the cavity fundamental mode. For larger excitations, we observed bifurcation and hysteresis effects. The response to an rf voltage modulation revealed two peaks near the quadrupole-mode frequency, one of which appears to be related to the longitudinal instability. In this paper we present the experimental results. C1 SLAC, Stanford, CA 94309 USA. RP Minty, MG (reprint author), SLAC, Stanford, CA 94309 USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1741 EP 1743 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800559 ER PT B AU Assadi, S Mishra, CS AF Assadi, S Mishra, CS BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Measurement and simulation of nonlinear beam-beam mode coupling in the Fermilab Tevatron SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Tevatron beam dynamics has been studied from the "weak-strong" representation of the beam-beam effects for various octupole field settings. A single particle is tracked using TEAPOT in the presence of the other beam. The nonlinearities introduced by the beam-beam forces introduces two unwanted effects: (1) it excites nonlinear resonances; (2) it introduces dispersion of the tunes with amplitude. The strength of nonlinear three mode coupling satisfying the sum rules v(3)=v(1)+/-v(2) for various octupole settings are calculated. The higher order spectral analysis results are presented. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Assadi, S (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 1771 EP 1773 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800569 ER PT B AU Shiltsev, VD AF Shiltsev, VD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam-beam simulations with crossing angle in TEV33 SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We consider effects of finite crossing angle at collision point on beam dynamics in the Tevatron collider upgrade (TEV33). Impact of the beam-beam interaction on beam sizes, particles diffusion and luminosity is studied with use of computer simulations. Parameter space for better collider performance is proposed. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Shiltsev, VD (reprint author), Fermi Natl Accelerator Lab, POB 500,MS-345, Batavia, IL 60510 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1774 EP 1776 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800570 ER PT B AU Bane, KLF Chen, P Zimmermann, F AF Bane, KLF Chen, P Zimmermann, F BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam-beam simulations with non-Gaussian distributions for SLC and SLC-2000 SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Due to various upstream beam manipulations, the longitudinal bunch shape at the interaction point of the Stanford Linear Collider (SLC) is highly non-Gaussian. In this paper, we report beam-beam simulations with realistic longitudinal bunch shapes for the present SLC parameters and for the SLC-2000 luminosity upgrade. The simulation results allow us to estimate the luminosity enhancement due to the pinch effect and to find optimum parameter settings for the bunch compressor and the linac. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Bane, KLF (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1789 EP 1791 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800575 ER PT B AU Hershcovitch, A AF Hershcovitch, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI High current magnetized plasma discharges and electron beams for capture and cooling of charged leptons and hadrons SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID TRANSPORT AB Nowadays most magnetic lenses used to capture and to focus pions and muons utilize azimuthal magnetic fields generated by large axial currents, like horns or lithium rods (or even a Z-pinch at GSI). Capture and focusing angle is proportional to the product of the current and length of the lens. State-of-the-art for these lenses is no more than 750 kA and 70 cm. A meter long, multi-MA, magnetized axial discharges were generated in the early days of fusion. Lenses based of such devices can increase the capture angle of pions, e.g., by more than a factor of 2. Electron beam cooling is presently achieved in storage rings by having charged particles interact with a comoving electron beam. In these devices, typical parameters are electron beam currents of about 1 A, an interaction length of about 1 meter, and interaction time of about 30 msec. Multi-MA electron beams can be used for single-pass final stage cooling in a number of machines. Calculations for some applications, as well as other advantages indicate that these schemes deserve further more serious consideration. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Hershcovitch, A (reprint author), Brookhaven Natl Lab, 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 0-7803-4376-X PY 1998 BP 1792 EP 1794 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800576 ER PT B AU Zholents, A Zolotorev, M Wan, W AF Zholents, A Zolotorev, M Wan, W BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design and analysis of a cooling insertion lattice for optical stochastic cooling SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Accelerator & Fus Res, Berkeley, CA 94720 USA. RP Zholents, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Accelerator & Fus Res, Berkeley, CA 94720 USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1801 EP 1803 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800579 ER PT B AU Zholents, A Zolotorev, M AF Zholents, A Zolotorev, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An amplifier for optical stochastic cooling SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID TI-AL2O3; LASER C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Accelerator & Fus Res, Berkeley, CA 94720 USA. RP Zholents, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Accelerator & Fus Res, Berkeley, CA 94720 USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1804 EP 1806 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800580 ER PT B AU Stupakov, GV Chao, AW AF Stupakov, GV Chao, AW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Effect of diffusion on bunched beam echo SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB When a beam receives a dipole kick, its centroid signal decoheres due to the betatron tune spread in the beam. Long after the signal has decohered, however, a follow-up quadrupole kick to the beam brings a pronounced echo back to the centroid signal. This echo effect has been analyzed for the case of a bunched beam in Ref. [1]. In this work, the perturbation calculation of Ref. [1] is extended to include a diffusion in betatron amplitude. The effect of diffusion on the magnitude of the echo is then parameterized and studied. 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 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 0-7803-4376-X PY 1998 BP 1834 EP 1836 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800590 ER PT B AU Nelson, EM AF Nelson, EM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Advances in 3D electromagnetic finite element modeling SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID FIELD COMPUTATION AB Numerous advances in electromagnetic finite element analysis (FEA) have been made in recent years. The maturity of frequency domain and eigenmode calculations, and the growth of time domain applications is briefly reviewed. A high accuracy 3D electromagnetic finite element field solver employing quadratic hexahedral elements and quadratic mixed-order one-form basis functions will also be described. The solver is based on an object-oriented C++ class library. Test cases demonstrate that frequency errors less than 10 ppm can be achieved using modest workstations, and that the solutions have no contamination from spurious modes. The role of differential geometry and geometrical physics in finite element analysis is also discussed. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM enelson@lanl.gov NR 19 TC 2 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1837 EP 1840 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800591 ER PT B AU Caporaso, GJ Chen, YJ Poole, B AF Caporaso, GJ Chen, YJ Poole, B BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Transmission line analysis of beam deflection in a BPM stripline kicker SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In the usual treatment of impedances of beamline structures the electromagnetic response is computed under the assumption that the source charge trajectory is parallel to the propagation axis and is unaffected by the wake of the structure. For high energy beams of relatively low current this is generally a valid assumption. Under certain conditions the assumption of a parallel source charge trajectory is no longer valid and the effects of the changing trajectory must be included in the analysis. Here the usual transmission line analysis [1] that has been applied to BPM type transverse kickers is extended to include the self-consistent motion of the beam in the structure. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Caporaso, GJ (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 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 0-7803-4376-X PY 1998 BP 1861 EP 1863 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800598 ER PT B AU Chen, YJ AF Chen, YJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Space-charge forces of a DC beam in a continuous bend SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB It has been shown that the net space-charge forces for a de beam with space-charge potential depression in a bend have the usual inverse energy square dependence to the first order in the beam radius a over the bend radius R. We extend the analysis to the second order in a/R and allow the beam to have a small transverse displacement. The net space-charge forces are no longer cancelled to inverse energy square factor. The non-cancelled part of self-induced magnetic forces are at the second order in a/R and independent of the beam energy. The nonlinear parts of these forces are much larger than that of the usual inverse energy square forces. Scaling laws for emittance growth caused by the curvature of the beam and a transverse beam displacement, respectively, are presented. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Chen, YJ (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 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 0-7803-4376-X PY 1998 BP 1864 EP 1866 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800599 ER PT B AU Bane, KLF Minty, MG Chao, AW AF Bane, KLF Minty, MG Chao, AW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Simulation of bunch precompression at high currents in the SLC damping rings SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In the Stanford Linear Collider (SLC) each beam, after leaving a damping ring, is compressed in the Ring-to-Linac (RTL) transfer line before entering the linear accelerator. At a bunch population of 4.0 x 10(10) particles, due to the limited energy acceptance of the RTL, approximately 15% of the beam has normally been lost. During the 1996 run, however, to eliminate this loss the bunch was partially precompressed in the damping ring, just before extraction; the beam loss in the RTL was reduced to almost zero. In Ref. [1] the operation and performance of precompression are presented. Also given is an analysis which, however, does not include the effects of the longitudinal wakefield on the beam dynamics. In this report we extend that analysis to include these effects. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Bane, KLF (reprint author), Stanford Univ, 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 0-7803-4376-X PY 1998 BP 1873 EP 1875 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800602 ER PT B AU Bane, KLF Decker, FJ Seeman, JT Zimmermann, F AF Bane, KLF Decker, FJ Seeman, JT Zimmermann, F BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Measurement of the longitudinal wakefield and the bunch shape in the SLAC linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We report on measurements of the bunch energy spectrum at the end of the SLAG linac. Using the spectra obtained for two different linac rf phases we obtain both the bunch induced voltage and the longitudinal distribution of the bunch. The measurement results are compared with theoretical predictions. In particular, the induced voltage is in good agreement with that obtained using the calculated wake function for the SLAG linac. This measurement technique may be useful for monitoring changes of the linac bunch shape in the SLC. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Bane, KLF (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 1876 EP 1878 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800603 ER PT B AU Luccio, AU Beebe-Wang, J Maletic, D Jones, FW AF Luccio, AU Beebe-Wang, J Maletic, D Jones, FW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Proton injection and RF capture in the national spallation neutron source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The accelerator system for the 1 to 5 MW National Spallation Neutron Source (NSNS) consists of a linac followed by a 1 GeV proton accumulator ring. Since the ring is a very high current machine, the injection and rf capture of the protons is deeply affected by transverse and longitudinal space charge effects. Results of numerical simulation of the process are presented together with considerations on methods and results of space charge treatment in high intensity proton storage rings. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Luccio, AU (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 0-7803-4376-X PY 1998 BP 1882 EP 1884 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800605 ER PT B AU Zhang, SY Weng, WT AF Zhang, SY Weng, WT BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Transverse instability in high intensity proton rings SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Most high intensity proton rings are at low energy below transition. Several aspects of the beam dynamics of this kind of rings are different from the electron or high energy rings. The transverse microwave instabilities will be discussed in this article. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Zhang, SY (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 0-7803-4376-X PY 1998 BP 1885 EP 1887 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800606 ER PT B AU Carlsten, BE AF Carlsten, BE BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Emittance growth of an intense electron beam in a focusing channel SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We use the single-particle radial equation of motion to identify nonlinear forces which lead to an emittance growth in a focusing channel consisting of solenoids. For a uniform density beam, the two dominant effects are the axial velocity variations within a solenoid due to the particles' azimuthal velocity and changes in the particle's energy due to radial motion and the radial electric space-charge field. We derive estimates for the emittance growth for a space-charge dominated beam due to these effects, both for the case of a hard focus to a small beam waist and for the case where there is gentle beam scalloping. We also briefly catalog less important emittance growth mechanisms. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Carlsten, BE (reprint author), Univ Calif 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 0-7803-4376-X PY 1998 BP 1914 EP 1916 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800616 ER PT B AU Lysenko, W Parsa, Z AF Lysenko, W Parsa, Z BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam matching and halo control SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We present an overview of the status of ongoing work on physics models describing beam matching and halo control for particle accelerators, particularly high power ion linacs. We consider moments and various new variables that more naturally describe beam halo evolution. We compute matched beams and "mode invariants" (analogs of moment invariants) using primarily symbolic techniques. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Lysenko, W (reprint author), Univ Calif Los Alamos Natl Lab, MS H808, Los Alamos, NM 87545 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1917 EP 1919 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800617 ER PT B AU Young, LM AF Young, LM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Equipartitioning in a high current proton linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The code PARMILA simulates the beam transmission through the Accelerator for the Production of Tritium (APT) linac. The beam is equipartitioned when the longitudinal and transverse temperatures are equal. This paper explores the consequence of equipartitioning in the APT linac. The simulations begin with a beam that starts at the ion-source plasma surface. PARMILA tracks the particles from the RFQ exit through the 1.7-GeV linac. This paper compares two focusing schemes. One scheme uses mostly equal strength quadrupoles. The equipartitioning scheme uses weaker focusing in the high-energy portion of the linac. The RMS beam size with the equipartitioning scheme is larger, but the relative size of the halo is less than in the equal-strength design. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Young, LM (reprint author), Univ Calif Los Alamos Natl Lab, MS H817, 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 0-7803-4376-X PY 1998 BP 1920 EP 1922 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800618 ER PT B AU Fawley, WM Seidl, P Haber, I Friedman, A Grote, DP AF Fawley, WM Seidl, P Haber, I Friedman, A Grote, DP BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Numerical simulation studies of the LBNL heavy-ion beam combiner experiment SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Transverse beam combining is a cost-saving option employed in many designs for heavy-ion inertial fusion energy(1) drivers. A major area of interest, both theoretically and experimentally, is the resultant transverse phase space dilution during the beam merging process. Currently, a prototype combining experiment is underway at LBNL and we have employed a variety of numerical descriptions to aid in both the initial design of the experiment as well as in the interpretation of the experimental data. These range from simple envelope codes to detailed 2- and 3-D PIC simulations. We compare the predictions of the different numerical models to each other and to experimental data at different longitudinal positions. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Fawley, WM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1923 EP 1925 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800619 ER PT B AU Seidl, PA Celata, CM Chupp, WW Faltens, A Fawley, WM Ghiorso, W Hahn, K Henestroza, E MacLaren, S Peters, C AF Seidl, PA Celata, CM Chupp, WW Faltens, A Fawley, WM Ghiorso, W Hahn, K Henestroza, E MacLaren, S Peters, C BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A scaled beam-combining experiment for heavy ion inertial fusion SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Transverse beam combining is a cost-saving option employed in many designs for induction linac heavy ion fusion drivers. The resultant transverse emittance increase, due predominantly to anharmonic space charge forces. must be kept minimal so that the beam remains focusable at the target. A prototype combining experiment has been built and preliminary results are presented. Four sources each produce up to 4.8 mA Cs+ beams at 160 keV. Focusing upstream of the merge consists of four quadrupoles and a final combined-function element (quadrupole gr dipole). All lattice elements elf the prototype are electrostatic. Due to the small distance between beams near the merge (similar to 3-4 mm), the electrodes here are a cage of small rods, each at different voltage. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Seidl, PA (reprint author), Univ Calif Berkeley, Lawrence Berkeley 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 0-7803-4376-X PY 1998 BP 1926 EP 1928 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800620 ER PT B AU Barnard, JJ Lund, SM AF Barnard, JJ Lund, SM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Theory of longitudinal beam halo in RF linacs: I. Core/test-particle formulation SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB For intense beams, the analysis of tenuous halo components of the particle distribution that surround the main core of the beam can be challenging. So-called core/test-particle models in which a test-particle is evolved in the applied and space-charge forces of the beam core have been instrumental in understanding the structure and extent of transverse beam halo produced by resonant particle interactions with the oscillating space-charge forces of a mismatched beam core. Here we present a core/test-particle model developed for the analysis of longitudinal beam halo in intense, ion-beam rf linacs. Equations of motion are derived for a test-particle moving interior to, and exterior to, a uniform density ellipsoidal beam bunch. Coupled transverse-longitudinal mismatch modes of the ellipsoidal beam envelope are analyzed. Typical parameters suggest the possibility of a low-order resonant interaction between longitudinal particle oscillations and a low-frequency envelope mode. Properties of this resonance are analyzed in an accompanying paper by the authors in these proceedings(1). C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Barnard, JJ (reprint author), Univ Calif Lawrence Livermore Natl Lab, L-440, Livermore, CA 94550 USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1929 EP 1931 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800621 ER PT B AU Lund, SM Barnard, JJ AF Lund, SM Barnard, JJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Theory of longitudinal beam halo in RF linacs: II. Envelope-particle resonances SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Using the core/test-particle model described in a companion paper in these proceedings(1) ("Theory of Longitudinal Halo in rf Linacs: I. Core/Test-Particle Formulation," by J. J. Barnard and S. M. Lund), we analyze longitudinal beam halo produced by resonant self-held interactions in intense, ion-beam rf linacs. It is shown that particles moving in the presence of the space-charge forces of an oscillating, mismatched ellipsoidal beam bunch can be resonantly driven to large longitudinal amplitude. This resonantly produced halo is first analyzed in a limit where it is most simply understood, with particles moving purely longitudinally and with linear rf focusing. Then modifications of the resonance induced by nonlinear rf and transverse-longitudinal coupling are explored. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Lawrence Livermore Natl Lab, L-440, Livermore, CA 94550 USA. EM lund@hif.lnl.gov; jjbarnard@llnl.gov NR 1 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1932 EP 1934 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800622 ER PT B AU Dunham, B Liu, H Kazimi, R AF Dunham, B Liu, H Kazimi, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The calculation, simulation, and measurement of longitudinal beam dynamics in electron injectors SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Polarized electrons are a valuable commodity for nuclear physics research and every effort must be made to preserve them during transport. Measurements of the beam emitted from the polarized source at the Thomas Jefferson National Accelerator Facility (Jefferson Lab) have shown a considerable bunch lengthening with increasing beam current. This lengthening leads to unacceptable loss as the beam passes through the injector chopping system. We present an application of the longitudinal envelope equation to describe the bunch lengthening and compare the results to measurements and simulations using PARMELA. In addition, a possible solution to the problem by adding a low power buncher to the beamline is described and initial results are shown. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Dunham, B (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 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 0-7803-4376-X PY 1998 BP 1947 EP 1949 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800627 ER PT B AU Ben-Zvi, I Qiu, JX Wang, XJ AF Ben-Zvi, I Qiu, JX Wang, XJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Picosecond-resolution 'slice' emittance measurement of electron-bunches SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Slice Emittance diagnostic is applicable to particle bunches in a linac that are of the order of a few degrees of phase long. In this technique, the transverse phase space of a longitudinal slice about one degree long is measured. The Slice Emittance diagnostic has been demonstrated on an electron bunch produced by a laser-photocathode RF gun. We measured the transverse beam matrix of one picosecond slices out of a 10 picosecond long bunch (about 10 degrees at the RF frequency of 2856 MHz). To implement this diagnostic one needs a phase shifter on part of the linac, a momentum analyzer (a dipole magnet followed by a slit) and a transverse emittance measuring system following the analyzer. By dephasing the last section (or sections) of the linac, longitudinal position in the bunch is correlated with energy. The momentum analyzer selects a short longitudinal slice by discriminating on energy and the transverse phase space of this slice is measured downstream of the analyzer. The Slice Emittance diagnostic, particularly in conjunction with tomographic analysis of the transverse phase space of the slices, provides significant new information about the 6-D phase space distribution of the beam. The experimental work done with this diagnostic has been used to study the details of the important emittance compensation method that is in wide use in photoinjectors. This diagnostic makes it possible to take the emittance compensation method a step further and apply non-linear emittance compensation for higher brightness beams. C1 Brookhaven Natl Lab, Nat Synchrotron Light Source 725C, Upton, NY 11973 USA. RP Ben-Zvi, I (reprint author), Brookhaven Natl Lab, Nat Synchrotron Light Source 725C, Upton, NY 11973 USA. NR 4 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1971 EP 1975 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800635 ER PT B AU Wang, DX AF Wang, DX BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Electron beam instrumentation techniques using coherent radiation SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID SYNCHROTRON-RADIATION; TRANSITION RADIATION; LINEAR-ACCELERATOR; WAVELENGTH; BUNCHES; PULSES AB Much progress has been made on coherent radiation research since coherent synchrotron radiation was first observed in 1989. The use of coherent radiation as a bunch length diagnostic tool has been studied by several groups. In this paper, brief introductions to coherent radiation and far-infrared measurement are given, the progress and status of their beam diagnostic application are reviewed, different techniques are described, and their advantages and limitations are discussed. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Wang, DX (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave,MS 58, Newport News, VA 23606 USA. NR 36 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1976 EP 1980 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800636 ER PT B AU Kotseroglou, T Alley, R McCormick, D Horton-Smith, S Jobe, K Raimondi, P Ross, MC Shintake, T Zimmermann, F AF Kotseroglou, T Alley, R McCormick, D Horton-Smith, S Jobe, K Raimondi, P Ross, MC Shintake, T Zimmermann, F BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A laser-heterodyne bunch-length monitor for the SLC interaction point SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Since 1996, the transverse beam sizes at the SLC interaction point (IP) can be determined with a 'laser wire', by detecting the rate of Compton-scattered photons as a function of the beam-laser separation in space. Nominal laser parameters are: 350 nm wavelength, 2 mJ energy per pulse, 40 Hz repetition rate, and 150 ps FWHM pulse length. The laser system is presently being modified to enable measurements of the longitudinal beam profile. For this purpose, two laser pulses of slightly different frequency are superimposed, which creates a travelling fringe pattern and, thereby, introduces a bunch-to-bunch variation of the Compton rate. The magnitude of this variation depends on the beat wavelength and on the Fourier transform of the longitudinal distribution. This laser heterodyne technique is implemented by adding a l-km long optical fibre at the laser oscillator output, which produces a linearly chirped laser pulse with 4.5-A linewidth and 60-ps FWHM pulse length. Also, the pulse is amplified in a regenerative amplifier and tripled with two nonlinear crystals. Then a Michelson interferometer spatially overlaps two split chirped pulses, which are temporally shifted with respect to each other, generating a quasi-sinusoidal adjustable fringe pattern. This laser pulse is then transported to the Interaction Point. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Kotseroglou, T (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1981 EP 1983 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800637 ER PT B AU Leemans, WP Volfbeyn, P Zolotorev, M Kim, KJ Chattopadhyay, S Schoenlein, RW Chin, AH Glover, TE Balling, P Shank, CV AF Leemans, WP Volfbeyn, P Zolotorev, M Kim, KJ Chattopadhyay, S Schoenlein, RW Chin, AH Glover, TE Balling, P Shank, CV BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Laser based sub-picosecond electron bunch characterization using 90 degrees Thomson scattering SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID PULSES AB X-rays produced by 90 degrees Thomson scattering of a femtosecond, near infrared, terawatt laser pulse off a 50 MeV electron beam are shown to be an effective diagnostic to measure transverse and longitudinal density distributions of an electron beam (e-beam) with subpicosecond time resolution. The laser beam was focused onto the e-beam waist, generating 30 keV x-rays in the forward direction. The transverse and longitudinal e-beam structure have been obtained by measuring the intensity of the x-ray beam: while scanning the laser beam across the e-beam in space and time. The e-beam divergence has been obtained through measurement of spatial and spectral characteristics of the scattered x-ray beam. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Leemans, WP (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RI Balling, Peter/D-8116-2013; Schoenlein, Robert/D-1301-2014 OI Balling, Peter/0000-0003-4955-770X; Schoenlein, Robert/0000-0002-6066-7566 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 0-7803-4376-X PY 1998 BP 1984 EP 1986 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800638 ER PT B AU Nguyen, DC AF Nguyen, DC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Electron bunch length diagnostic with coherent Smith-Purcell radiation SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We have designed a new technique for measuring subpicosecond electron bunch lengths using coherent Smith-Purcell radiation. This new diagnostic technique involves passing the electron beam in close proximity of a grating with period comparable to the electron bunch length. The emitted Smith-Purcell radiation will have a coherent component whose angular position and distribution are directly related to the electron bunch length and longitudinal profile, respectively. This new diagnostic technique is inherently simple, inexpensive and non-intercepting. We show that the new technique is also scaleable to femtosecond regime. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Nguyen, DC (reprint author), Univ Calif Los Alamos Natl Lab, MS H851, 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 0-7803-4376-X PY 1998 BP 1990 EP 1992 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800640 ER PT B AU Graves, WS Johnson, ED O'Shea, PG AF Graves, WS Johnson, ED O'Shea, PG BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A high resolution electron beam profile monitor SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A new beam diagnostic to measure transverse profiles of electron beams is described. This profile monitor uses a Yttrium:Aluminum:Garnet (YAG) crystal doped with a visible-light scintillator to produce an image of the tranverse beam distribution. The advantage of this material over traditional fluorescent screens is that it is formed from a single crystal, and therefore has improved spatial resolution. The current system is limited to a resolution of about 10 microns. Improvements in the optical transport will enable measurements of RMS beam sizes of less than 1 micron. The total cost of the system is modest. C1 Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. RP Graves, WS (reprint author), Brookhaven Natl Lab, NSLS, 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 0-7803-4376-X PY 1998 BP 1993 EP 1995 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800641 ER PT B AU Conde, M Gai, W Konecny, R Li, X Power, J Schoessow, P Barov, N AF Conde, M Gai, W Konecny, R Li, X Power, J Schoessow, P Barov, N BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The Argonne Wakefield Accelerator: Diagnostics and beam characterization SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Argonne Wakefield Accelerator is comprised of two L-band photocathode RF guns and standing wave linac structures. The high charge bunches (20 - 100 nC) produced by the main gun (drive gun) allow us to study the generation of wakefields in dielectric lined structures and plasmas. The secondary gun (witness gun) generates low charge bunches (80 - 300 pC) that are used to probe the wakefields excited by the drive bunches, We use insertable phosphor screens for beam position monitoring. Beam intensity is measured with Faraday cups and integrating current transformers. Quartz or aerogel Cerenkov radiators are used in conjunction with a Hamamatsu streak-camera for bunch length measurements. The beam emittance is measured with a pepper-pot plate and also by quadrupole scan techniques. We present a description of the various diagnostics and the results of the measurements. These measurements are of particular interest for the high current (drive) linac, which operates in a much higher charge regime than other photoinjector-based linacs. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Conde, M (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 1996 EP 1998 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800642 ER PT B AU Lumpkin, AH Yang, BX AF Lumpkin, AH Yang, BX BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Time-resolved imaging of electron and positron beams at APS SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Characterizations of stored electron beams and more recently positron beams circulating in the Advanced Photon Source (APS) 7-GeV storage ring have been done using optical synchrotron radiation (OSR) and x-ray synchrotron radiation (XSR) imaging techniques. Results include the measurement of the bunch length and horizontal beam size versus single-bunch current for both electron and positron beams, observations of multibunch bunch length effects near 100 mA stored beam current, and initial diagnostics of a coupled-bunch instability with 15-minute period. Both the Hamamatsu C5680 dual-sweep streak camera using OSR and a pinhole camera using XSR from a bending magnet source point were utilized. Proposed enhancements to the beamline will also be presented. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Lumpkin, AH (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 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 0-7803-4376-X PY 1998 BP 1999 EP 2001 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800643 ER PT B AU Russell, SJ AF Russell, SJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Measuring the RMS length of short electron pulses with an RF cavity and a beam position monitor SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Sub-picosecond Accelerator at Los Alamos National Laboratory is a 1300 MHz, 8 MeV photoinjector. Its beam can be bunched to sub-picosecond lengths using a magnetic chicane. To observe this, we use an rf cavity operating in a TM110 mode to generate a transverse magnetic dipole field that "streaks' each bunch as it passes. Inserting a screen downstream, we determine the pulse length by measuring the increase in the beam spot width. To achieve sufficient resolution two things must happen: first, the unstreaked beam must be well focused at the screen, and, second, the drift after the cavity must be long enough. At high charge and short pulse lengths, these goals become mutually exclusive. To eliminate this problem, we propose using a beam position monitor instead of a screen. The second moment of the beam position monitor signals determines the difference between the x and y rms widths of the beam. With a properly orientated cavity, the resulting change in this quantity also gives the pulse length. However, the BPM does not require a well focused beam at its position, eliminating that constraint on resolution. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Russell, SJ (reprint author), Univ Calif Los Alamos Natl Lab, MS H851, 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 0-7803-4376-X PY 1998 BP 2005 EP 2007 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800645 ER PT B AU Daly, EF Fisher, AS Kurita, NR Langton, JB AF Daly, EF Fisher, AS Kurita, NR Langton, JB BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Mechanical design of the HER synchrotron light monitor primary mirror for the PEP-II B-Factory SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper describes the mechanical design of the primary mirror that images the visible portion of the synchrotron radiation (SR) extracted from the High Energy Ring (HER) of the PEP-II B-Factory. During off-axis operation, the water-cooled GlidCop mirror is subjected to a heat flux in excess of 2000 W/cm(2). When on-axis imaging occurs, the heat flux due to scattered SR, resistive wall losses and Higher-Order-Mode (HOM) heating is estimated at 1 W/cm(2). The imaging surface is plated with Electroless Nickel to improve its optical characteristics. The design requirements for the primary mirror are listed and discussed. Calculated mechanical distortions and stresses experienced by the mirror during on-axis and off-axis operation will be presented. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Daly, EF (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2014 EP 2016 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800648 ER PT B AU Raparia, D Alessi, J Kponou, A AF Raparia, D Alessi, J Kponou, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The Algebraic Reconstruction Technique (ART) SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Projections of charged particle beam current density (profiles) are frequently used as a measure of beam position and size. In conventional practice only two projections, usually horizontal and vertical, are measured. This puts a severe limit on the detail of information that can be achieved. A third projection provides a significant improvement. The Algebraic Reconstruction Technique (ART) uses three or more projections to reconstruct 3-dimensional density profiles. At the 200 MeV H- linac, we have used this technique to measure beam density, and it has proved very helpful, especially in helping determine if there is any coupling present in x-y phase space. We will present examples of measurements of current densities using this technique. C1 Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. RP Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. EM raparia@bnl.gov; alessi@bnl.gov NR 3 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2023 EP 2025 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800651 ER PT B AU Blokland, W Vogel, G Dey, J AF Blokland, W Vogel, G Dey, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A new flying wire system for the Tevatron SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A new flying wire system replaces an older system to enhance the analysis of beam emittance, improve reliability, and support future upgrades to the Tevatron. New VME data acquisition and timing modules allow for more bunches to be sampled more precisely. A LabVIEW application, running on a Macintosh computer, controls the data acquisition and wire motion. The application also analyzes and stores the data as well as handles local and remote commands. The new system flies three wires and fits profiles of 72 bunches to a gaussian function in a total of three seconds. A new console application allows remote operator control and display from any control console. This paper discusses the hardware and software setup, capabilities, and measurement results of the new flying wire system. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Blokland, W (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 2032 EP 2034 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800654 ER PT B AU Yang, MJ AF Yang, MJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A high speed, multi-sampling data acquisition for beam diagnostics SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A program is developed to collect accelerator data using a high speed digitizer and to display data for beam diagnostics. The digitizer has speed up to 2 Gs/s and is multiply retriggerable up to 1024 traces. The signal can be from either wall current monitor for longitudinal dynamics or the strip-line detector for transverse dynamics. The FFT spectral analysis of individual data trace gives the frequency composition of the signal from a train of beam bunches. The FFT analysis of transposed data gives the spectral composition down to sub-synchrotron frequencies. The data is displayed as a plot of single trace, mountain ranges, or 2-dimensional contours to give different perspectives. The physics examples are given. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Yang, MJ (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 2035 EP 2037 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800655 ER PT B AU Power, JF Gilpatrick, JD Stettler, MW AF Power, JF Gilpatrick, JD Stettler, MW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design of a VXI module for beam phase and energy measurements for LEDA SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Beam diagnostics systems being designed for the Low Energy Demonstrator Accelerator (LEDA) at Los Alamos include beam synchronous-phase and beam energy measurements[1]. The LEDA machine will utilize an RFQ front end operating at 350 MHz, followed by several 700-MHz DTL accelerating structures. Signals from cavity-field probes and beam image-current probes will be down-converted to 2 MHz for phase measurement in VXI modules. Each 2-MHz signal is sampled at 8 MHz with a 12-bit ADC and the resultant data stream is converted into I and Q components which update at a 2-MHz rate. The I and Q signals are then converted to a relative phase measurement. Each VXI module will contain four channels of phase measurement hardware which allow for two channels of differential-phase measurement. Low-noise AGC circuits will accommodate signal variations over a 64 dB dynamic range. An on-board calibration system provides a system absolute accuracy of +/-1 degree. DSP filtering allows 200-kHz bandwidth measurements to be made with a resolution of <0.1 degrees over a dynamic range of 46 dB. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Power, JF (reprint author), Univ Calif 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 0-7803-4376-X PY 1998 BP 2041 EP 2043 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800657 ER PT B AU Rose, CR Stettler, MW AF Rose, CR Stettler, MW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Description and operation of the LEDA beam-position/intensity measurement module SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper describes the specification, design and preliminary operation of the beam-position/intensity measurement module being built for the Low Energy Demonstration Accelerator (LEDA) and Accelerator Production of Tritium (APT) projects at Los Alamos National Laboratory. The module. based on the VXI footprint, is divided into three sections: first, the analog front-end which consists of logarithmic amplifiers, anti-alias filters, and digitizers; second, the digital-to-analog section for monitoring signals on the front panel; and third, the DSP, error correction, and VXI-interface section. Beam position is calculated based on the log-ratio transfer function. The module has four, 2-MHz, IF inputs suitable for two-axis position measurements. It has outputs in both digital and analog format for x- and y-position and beam intensity. Realtime error-correction is performed on the four input signals after they are digitized and before calculating the beam position to compensate for drift, offsets, gain nonlinearities, and other systematic errors. This paper also describes how the on-line error-correction is implemented digitally and algorithmically. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Rose, CR (reprint author), Univ Calif 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 0-7803-4376-X PY 1998 BP 2044 EP 2046 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800658 ER PT B AU Yang, BX Lumpkin, AH Borland, M Harkay, K Nassiri, A AF Yang, BX Lumpkin, AH Borland, M Harkay, K Nassiri, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Characterization of beam dynamics in the APS injector rings using time-resolved imaging techniques SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Images taken with streak cameras and gated intensified cameras with both time (longitudinal) and spatial (transverse) resolution reveal a wealth of information about circular accelerators. We illustrate a novel technique by a sequence of dual-sweep streak camera images taken at a high dispersion location in the booster synchrotron, where the horizontal coordinate is strongly correlated with the particle energy and the "top-view" of the beam gives a good approximation to the particle density distribution in the longitudinal phase space. A sequence of top-view images taken right after injection clearly shows the beam dynamics in the phase space. We report another example from the positron accumulator ring for the characterization of its beam compression bunching with the 12th harmonic rf. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Yang, BX (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 0-7803-4376-X PY 1998 BP 2052 EP 2054 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800661 ER PT B AU Church, M AF Church, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Lattice function measurements in the Fermilab Accumulator Ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The betatron phase advance between two points in a storage ring can be very accurately determined from a transverse beam transfer function measurement with DC beam. The phase advance can be determined from the difference in the phase response between an upper betatron sideband (N+Q line) and a lower betatron sideband (N-Q line) in an open loop network analyzer measurement between a kicker and a pickup. The beta functions can then be extracted from these phase measurements. This method has the advantage that it does not depend on the amplitude response of the pickup, kicker, or electronics. This technique is applied to the Fermilab Accumulator Ring to measure the betatron phase advance at 90 points around the ring, and these measurements are compared to a MAD[1] model. C1 Fermilab, Batavia, IL 60510 USA. RP Church, M (reprint author), Fermilab, POB 500, Batavia, IL 60510 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2055 EP 2057 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800662 ER PT B AU Herrup, D AF Herrup, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Realtime tune measurements in slow-cycling accelerators SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Measurement and control of the tunes, coupling, and chromaticities in storage rings is essential to efficient operation of these accelerators. Yet it has been very difficult to make reliable realtime measurements of these quantities. We have built and commissioned the microprocessor-based Generic Finite State Data Acquisition (GFSDA) system. GFSDA provides turn-by-turn data acquisition and analysis of accelerator signals in a way that can be easily related to accelerator operations. The microprocessor is capable of calculating FFTs and correlations in real time. Both the Fermilab Main Ring and Tevatron use open loop tune, chromaticity, and coupling control, and the GFSDA measurements can easily be used to improve the open loop tables. We can add realtime feedback control with simple extensions of the system. We have used this system to make tune measurements closely spaced in time over an entire Tevatron ramp cycle. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Herrup, D (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2058 EP 2060 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800663 ER PT B AU Still, D Kourbanis, I Capista, D AF Still, D Kourbanis, I Capista, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Tune measurement methods in the Fermilab Main Ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Fermilab Main Ring has three different systems for measuring the betatron tune. The three systems are designed around a resonant beam pickup which interfaces to independent data collecting hardware. The data collecting hardware systems consist of a Hewlett Packard 35665A Dynamic Signal Analyzer, a Tektronix 3052 DSP and a Generic Finite State Data Acquisition (GFSDA) microprocessor system. This paper will describe the systems and the methods for measuring the betatron tune and chromaticity in the Fermilab Main Ring. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Still, D (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 2061 EP 2063 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800664 ER PT B AU Oothoudt, M Pillai, C Zumbro, M AF Oothoudt, M Pillai, C Zumbro, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Automatic beam position control at LASREF SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Historically the Los Alamos Spallation Radiation Effects Facility (LASREF) has used manual methods to control the position of the 800 kW, 800 MeV proton beam on targets. New experiments, however, require more stringent position control more frequently than can be done manually for long periods of time. Data from an existing harp is used to automatically adjust steering magnets to maintain beam position to required tolerances. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Oothoudt, M (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2064 EP 2066 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800665 ER PT B AU Thur, W Akre, J Gavidia, A Guigli, J AF Thur, W Akre, J Gavidia, A Guigli, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Mechanical design of a Pinger system for the LBNL Advanced Light Source accelerator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A fast magnet "Pinger System" has been designed for the Advanced Light Source 1.9 GEV electron Storage Ring. Intended for beam dynamics studies, its purpose is to provide a fast (< 600 ns) transverse magnetic field pulse to perturb the orbit of an electron bunch in a single turn. A key component is the special resistive-coated ceramic beam tube which is needed for fast magnetic field penetration. The evolution of the design concept is described, with emphasis on simplifications to provide an economical and mechanically robust device. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Thur, W (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 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 0-7803-4376-X PY 1998 BP 2067 EP 2068 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800666 ER PT B AU Nawrocky, RJ Keane, J AF Nawrocky, RJ Keane, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Performance of the upgraded NSLS beam position monitors SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The design and initial performance of the original NSLS beam position monitor (BPM, also referred to as the "rf receiver") were described by J. Bittner and R. Biscardi in 1989 [1]. The receiver, which processes signals from four button type pick-up electrodes by time-division multiplexing, operates at the third harmonic of the ring rf frequency (158.66 MHz). It has an output bandwidth of about 2 kHz and a dynamic signal range of approximately 36 dB. A total of 92 receivers have been installed in the NSLS X-ray and VUV storage rings for orbit monitoring and for real time feedback. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. RP Nawrocky, RJ (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2069 EP 2071 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800667 ER PT B AU Fitzgerald, J Crisp, J AF Fitzgerald, J Crisp, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A compact BPM for the Fermilab Main Injector SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Main Injector will use Beam Position Monitors (BPM) located inside the downstream end of every quadruple magnet. These magnets are reused (or derivatives of) Main Ring quads with existing beam tube still in place. The limited space available, and the desire to maintain the beam pipe aperture, required an unusual shaped BPM with innovative design and production techniques. Information on the various stages of the design, assembly, testing, calibration, and installation of the BPMs is presented. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Fitzgerald, J (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 2072 EP 2074 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800668 ER PT B AU Gilpatrick, JD AF Gilpatrick, JD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Comparison of beam-position-transfer functions using circular beam-position monitors SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A cylindrical beam-position monitor (BPM) used in many accelerator facilities has four electrodes on which beam-image currents induce bunched-beam signals. These probe-electrode signals are geometrically configured to provide beam-position information about two orthogonal axes. An electronic processor performs a mathematical transfer function (TF) on these BPM-electrode signals to produce output signals whose time-varying amplitude is proportional to the beam's vertical and horizontal position. This paper will compare various beam-position TFs using both pencil beams and will further discuss how diffuse beams interact with some of these TFs. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Gilpatrick, JD (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, 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 0-7803-4376-X PY 1998 BP 2090 EP 2092 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800674 ER PT B AU Rose, CR Gilpatrick, JD Stettler, MW AF Rose, CR Gilpatrick, JD Stettler, MW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The LEDA beam-position measurement system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper describes the beam-position measurement system being developed for the Low Energy Demonstration Accelerator (LEDA) and the Accelerator Production of Tritium (APT) projects at Los Alamos National Laboratory. The system consists of a beam-position monitor (BPM) probe, cabling, down-converter module, position/intensity module, on-line error-correction system, and the necessary control system interfaces. The modules are built on the VXI-interface standard and are capable of duplex data transfer with the control system. Some of the key, system parameters are: position-measurement bandwidth of at least 180 kHz, the ability to measure beam intensity, a beam-position measurement accuracy of less than 1.25 percent of the bore radius, a beam-current dynamic range of 46 dB, a total system dynamic range in excess of 75 dB, and built-in on-line digital-system-error correction. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Rose, CR (reprint author), Univ Calif 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 0-7803-4376-X PY 1998 BP 2093 EP 2095 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800675 ER PT B AU Johnson, R Smith, S Kurita, N Kishiyama, K Hinkson, J AF Johnson, R Smith, S Kurita, N Kishiyama, K Hinkson, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Calibration of the Beam-Position Monitor system for the SLAC PEP-II B Factory SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Beam-Position Monitors (BPM) for the PEP-II B Factory consist of four 1.5-cm diameter button style pickups mounted on the diagonals of the quadrupole vacuum chambers. Before installation of the vacuum chambers in the quadrupole assemblies, the electrical center of the BPMs is measured with respect to the mechanical center in a calibration test stand. In this paper the calibrations test stand is described and the precision and accuracy of the calibrations are presented. After installation of the quadrupole assemblies in the PEP-II tunnel, the passive attenuation for each channel of the system is measured to preserve the accuracy of the calibration. Finally, the active electronics includes an onboard calibrator. Results for these portions of the calibration are presented. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Johnson, R (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2110 EP 2112 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800681 ER PT B AU Medvedko, E Aiello, R Smith, S AF Medvedko, E Aiello, R Smith, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A two-bunch beam position monitor SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A new beam position monitor digitizer module has been designed, tested and tuned at SLAG. This module, the electron-positron beam position monitor (epBPM), measures position of single electron and positron bunches for the SLC, LINAC, PEPII injections lines and final focus. The epBPM has been designed to improve resolution of beam position measurements with respect to existing module and to speed feedback correction [1]. The required dynamic range is from 5x10(8) to 10(11) particles per bunch (46dB). The epBPM input signal range is from +/- 2.5 mV to +/- 500 mV. The pulse-to-pulse resolution is less than 2 mu m for 5 x 10(10) particles per bunch for the 12 cm long striplines, covering 30 degrees at 9 mm radius. The epBPM module has been made in CAMAC standard, single width slot, with SLAG type timing connector. 45 modules have been fabricated. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Medvedko, E (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2113 EP 2115 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800682 ER PT B AU Corlett, J Ng, CK Smith, SR AF Corlett, J Ng, CK Smith, SR BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Effect of TE mode power on the PEP-II LER BPM system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The beam chamber of the PEP-II B-Factory Low Energy Ring (LER) arc sections is connected to an antechamber for the absorption of synchrotron radiation on discrete photon stops. The presence of the antechamber substantially reduces the cutoff frequency of the vacuum chamber and, in particular, allows the propagation of higher-order-mode (HOM) TE power generated by beamline components at the BPM signal processing frequency. Calculations of the transmission properties of the TE mode in different sections of the vacuum chamber show that the power is trapped between widely separated bellows in the are sections. Because of the narrow signal bandwidth and weak coupling of the TE mode to the BPM buttons, the noise contributed by the HOM TE power will not produce a noticeable effect on the BPM position signal voltage. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Corlett, J (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2116 EP 2118 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800683 ER PT B AU Seidel, M Adolphsen, C Assmann, R Whittum, DH AF Seidel, M Adolphsen, C Assmann, R Whittum, DH BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Detection of beam induced dipole-mode signals in the SLC S-band structures SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Beam emittance dilution caused by wakefield effects is one of the important issues in the SLC linac. The detection of beam induced dipole mode signals in the C-band range could provide a direct measure of the strength of transverse wakefield kicks the beam experiences in the accelerating structures. We investigate the applicability of these microwave signals for beam steering purposes. The RF distribution system in the linac sectors 2, 6 and 29 has been equipped with a simple experimental setup to observe the beam induced dipole mode signals. The paper discusses the setup, the mode-structure of the observed signals as well as experimental results from beam steering scans, obtained during the 95/96 SLC runs. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Seidel, M (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2119 EP 2121 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800684 ER PT B AU Smith, SR Aiello, GR Hendrickson, LJ Johnson, RG Mills, MR Olsen, JJ AF Smith, SR Aiello, GR Hendrickson, LJ Johnson, RG Mills, MR Olsen, JJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam position monitor system for PEP-II SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We describe the beam position monitor system built for PEP-II, the B-factory at SLAG. The system reports beam position for bunches of between 5 x 10(8) and 8 x 10(10) electron charges, either singly or as continuous streams of bunches every 4.2 ns. Resolution at full charge is to be better than 10 microns in a single turn. Higher resolution is available via on-board multi-turn averaging. The position signal is processed in a 20 MHz bandwidth around 952 MHz. This bandwidth, rather broader than that typical of RF position monitors, allows good resolution for low charge single bunches. Additional novel features include stringent control of return losses in order to minimize cross-talk between nearby bunches which may contain very different charges. The digitizing electronics is multiplexed between the two PER-Il storage rings. Design, construction, and installation experience, as well as first results with beam are presented. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Smith, SR (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2122 EP 2124 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800685 ER PT B AU Chao, YC AF Chao, YC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Optics measurement resolution and BPM errors SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We study the impact of BPM resolution on optics measurements at various levels of complexity: (1) Formula linking a given distribution of BPM resolutions to the degree of precision to which any beam trajectory can be determined based on these BPM's. (2). Formula for the precision achievable in a generalized experimental scheme measuring transfer matrices in the presence of (potentially coupled) orbit errors. (3) Formula constructed from results of (1) and (2) to relate the precision of the transfer matrix measurement to the signal-to-noise ratio of the BPM system. (4) Criterion defined to summarize how well the overall optical behavior of a large modular beam transport system can be quantified. The results from (1), (2) and (3) are used to arrive at the final analytical expression providing a generic criterion on BPM resolution for such systems. Realistic examples are discussed. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Chao, YC (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave,MS 58, 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 0-7803-4376-X PY 1998 BP 2125 EP 2127 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800686 ER PT B AU Lebedev, VA Bickley, M Bisognano, J Schaffner, S van Zeijts, J Krafft, GA Tiefenback, M Watson, WA Yunn, B AF Lebedev, VA Bickley, M Bisognano, J Schaffner, S van Zeijts, J Krafft, GA Tiefenback, M Watson, WA Yunn, B BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Linear optics correction in the CEBAF accelerator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB During commissioning of the CEBAF accelerator correcting dispersion, momentum compaction and betatron beam envelopes was essential for robust operation. To speed the diagnostic process we developed a method which allows one to track and correct the machine optics on-line. The method is based on measuring the propagation of 30 Hz modulated betatron oscillations. The beam optics of the accelerator was altered to decrease lattice sensitivity at critical points and to simplify control of the betatron function match. The calculation of the Courant-Snyder invariant from signals of each pair of beam position monitors was used for a correction of the betatron functions. The experience of optics correction and the study of long and short term machine reproducibility obtained during 1996 and early 1997 are also discussed. With minor modifications this method can also be used for on-line optics measurement and correction in circular accelerators. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Lebedev, VA (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 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 0-7803-4376-X PY 1998 BP 2128 EP 2130 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800687 ER PT B AU Ursic, R Flood, R Piller, C Strong, E Turlington, L AF Ursic, R Flood, R Piller, C Strong, E Turlington, L BE Comyn, M Craddock, MK Reiser, M Thomson, J TI 1 nA beam position monitoring system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A system has been developed at Jefferson Lab for measuring transverse position of very low current beams delivered to the Experimental Hall B of the Continuous Electron Beam Accelerator Facility (CEBAF). At the heart of the system is a position sensitive cavity operating at 1497 MHz. The cavity utilizes a unique design which achieves a high sensitivity to beam position at a relatively low cavity Q. The cavity output RF signal is processed using a down-converter and a commercial lock-in amplifier operating at 100 kHz. The system interfaces with a VME based EPICS control system using the IEEE 488 bus. The main features of the system are simple and robust design, and wide dynamic range capable of handling beam currents from 1 nA to 1000 nA with an expected resolution better than 100 mu m. This paper outlines the design of the system. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23693 USA. RP Ursic, R (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23693 USA. OI Piller, Chip/0000-0003-4729-9364 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 0-7803-4376-X PY 1998 BP 2131 EP 2133 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800688 ER PT B AU Brown, KA Chiang, IH Gassner, D Geller, J Glenn, JW Hock, J Smith, GA Tuozzolo, J Witkover, R Zitvogel, E AF Brown, KA Chiang, IH Gassner, D Geller, J Glenn, JW Hock, J Smith, GA Tuozzolo, J Witkover, R Zitvogel, E BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A scanning target profile monitor for the slow extracted beam at the AGS SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Brown, KA (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 0-7803-4376-X PY 1998 BP 2149 EP 2151 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800694 ER PT B AU Connolly, R Cameron, P Ryan, W Shea, TJ Sikora, R Tsoupas, N AF Connolly, R Cameron, P Ryan, W Shea, TJ Sikora, R Tsoupas, N BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A prototype ionization profile monitor for RHIC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Transverse beam profiles in the Relativistic Heavy-ion Collider (RHIC) will be measured with ionization profile monitors (IPM's). Each IPM collects and measures the distribution of electrons in the beamline resulting from residual gas ionization during bunch passage. The electrons are swept transversely from the beamline and collected on strip anodes oriented parallel to the beam axis. At each bunch passage the charge pulses are amplified, integrated, and digitized for display as a profile histogram. A prototype detector was tested in the injection line during the RHIC Sextant Test. This paper describes the detector and gives results from the beam tests. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Connolly, R (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2152 EP 2154 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800695 ER PT B AU Huang, H Buxton, W Castillo, V Glenn, JW Mahler, G Syphers, M van Asselt, W Witkover, RL Zhang, SY AF Huang, H Buxton, W Castillo, V Glenn, JW Mahler, G Syphers, M van Asselt, W Witkover, RL Zhang, SY BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A multi-wire beam profile monitor in the AGS SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A multi-wire beam profile monitor which can be used to directly monitor and control the optical matching between the Booster and AGS rings has been installed and tested in the AGS. Placement of a multi-wire monitor directly in the AGS provides profile measurements taken upon injection and the first two or more revolutions of the beam. The data from such measurements can be used to determine the optical properties of the beam transport line leading into the AGS. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Huang, H (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 0-7803-4376-X PY 1998 BP 2155 EP 2157 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800696 ER PT B AU Mane, V Peggs, S Wei, J AF Mane, V Peggs, S Wei, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Radon reconstruction in longitudinal phase space SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Longitudinal particle motion in circular accelerators is typically monitored by one dimensional (1-D) profiles. Adiabatic particle motion in two dimensional (2-D) phase space can be reconstructed with tomographic techniques, using 1-D profiles. A computer program RADON has been developed in C++ to process digitized mountain range data and perform the phase space reconstruction for the ACS, and later for Relativistic Heavy Ion Collider (RHIC). C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Mane, V (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 0-7803-4376-X PY 1998 BP 2158 EP 2160 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800697 ER PT B AU Singh, O Krinsky, S AF Singh, O Krinsky, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Orbit compensation for the time-varying elliptically polarized wiggler with switching frequency at 100 hz SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In October 1996, the elliptically polarized wiggler, installed in the X13 straight section of the NSLS X-ray ring, was commissioned at an operating frequency of 100 hz. This wiggler generates circularly polarized photons in the energy range of 0.1 to 10 keV with AC modulation of polarization helicity. The vertical magnetic held is produced by a hybrid permanent magnet structure, and the horizontal magnetic field is generated by an electromagnet capable of switching at frequencies up to 100 hz. Here, we discuss the compensation of the residual vertical and horizontal orbit motion utilizing a time-domain algorithm employing a function generator to drive trim coils at the wiggler ends, and the wideband high precision orbit mesurement system of the X-ray ring. The residual orbit motion has been reduced to a level below 1 micron, and the device has been run in regular operations with no negative effect on other users. C1 Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. RP Singh, O (reprint author), Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2161 EP 2163 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800698 ER PT B AU Zagel, JR Crisp, JL Hahn, AA Hurh, PG AF Zagel, JR Crisp, JL Hahn, AA Hurh, PG BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Fermilab Main Ring Ion Profile Monitor System SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An Ion Profile Monitor System is now in operation in the Fermilab Main Ring. This system captures up to 64K samples of both horizontal and vertical profiles in Main Ring at a turn by turn sample rate. The hardware and software of the system is described. Some early results are presented. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Zagel, JR (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 2166 EP 2168 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800700 ER PT B AU Kwan, TJT DeVolder, BG Goldstein, JC Snell, CM AF Kwan, TJT DeVolder, BG Goldstein, JC Snell, CM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Study of a non-intrusive electron beam radius diagnostic SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We have evaluated the usefulness and limitation of a non-intrusive beam radius diagnostic which is based on the measurement of the magnetic moment of a high-current electron beam in an axisymmetric focusing magnetic field, and relates the beam root-mean-square (RMS) radius to the change in magnetic flux through a diamagnetic loop encircling the beam. An analytic formula that gives the RMS radius of the electron beam at a given axial position and a given time is derived and compared with results from a 2-D particle-in-cell code. Our study has established criteria for its validity and optimal applications. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Kwan, TJT (reprint author), Univ Calif 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 0-7803-4376-X PY 1998 BP 2174 EP 2176 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800703 ER PT B AU Russell, SJ AF Russell, SJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Preliminary results of RMS emittance measurements performed on the Sub-picosecond Accelerator using beam position monitors SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Sub-picosecond Accelerator at Los Alamos National Laboratory is a 1300 MHz, 8 MeV photoinjector. Concerned mainly with the exploration of bunched electron beams, the Sub-picosecond Accelerator facility is also used for a variety of other research. One ongoing task is the exploitation of the second moment properties of beam position monitor signals to measure the rms emittance. The unique properties of photoinjector beams make Gaussian assumptions about their distribution inaccurate and traditional methods of measuring the rms emittance fail. Using beam position monitors to measure the emittance, however, requires no beam distribution assumptions. Presented here are our first emittance measurements with this method on the Sub-picosecond Accelerator. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Russell, SJ (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663,MS H851, Los Alamos, NM 87545 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 0-7803-4376-X PY 1998 BP 2177 EP 2179 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800704 ER PT B AU Zolotorev, MS Stupakov, GV AF Zolotorev, MS Stupakov, GV BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Spectral fluctuations of incoherent radiation and measurement of longitudinal bunch profile SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A method for measurement of ultrashort beam current profile I-b(t) is proposed that is based on detecting fluctuations of the spectral intensity P(omega) of single bunch incoherent radiation. We show that the variance of the Fourier transform of the spectrum is proportional to the convolution function of the beam current. After the convolution function is found, using phase retrieval technique one can restore the shape of the pulse in many practical cases. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Ctr Beam Phys, Div Accelerator & Fus Res, Berkeley, CA 94720 USA. RP Zolotorev, MS (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Ctr Beam Phys, Div Accelerator & Fus Res, Berkeley, CA 94720 USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2180 EP 2182 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800705 ER PT B AU Nantista, C Adolphsen, C Brown, RL Fuller, R Rifkin, J AF Nantista, C Adolphsen, C Brown, RL Fuller, R Rifkin, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam profile monitors in the NLCTA SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The transverse current profile in the Next Linear Collider Test Accelerator (NLCTA) electron beam can be monitored at several locations along the beam line by means of profile monitors. These consist of insertable phosphor screens, light collection and transport systems, CID cameras, a frame-grabber, and PC and VAX based image analysis software. In addition to their usefulness in tuning and steering the accelerator, the profile monitors are utilized for emittance measurement. A description of these systems and their performance is presented. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Nantista, C (reprint author), Stanford Linear Accelerator Ctr, POB 4349, Stanford, CA 94309 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2186 EP 2188 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800707 ER PT B AU Zimmermann, F Yocky, G Whittum, D Seidel, M Raimondi, P Ng, CK McCormick, D Bane, K AF Zimmermann, F Yocky, G Whittum, D Seidel, M Raimondi, P Ng, CK McCormick, D Bane, K BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An RF bunch-length monitor for the SLC final focus SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In preparation for the 1997 SLC run, a novel RF bunch-length monitor has been installed in the SLC South Final Focus. The monitor consists of a ceramic gap in the beam pipe, a 160-ft long X-band waveguide (WR90), and a set of dividers, tapers and microwave detectors. Electromagnetic fields radiated through the ceramic gap excite modes in the nearby open-ended X-band waveguide, which transmits the beam-induced signal to a radiation-free shack outside of the beamline vault. There, a combination of power dividers, tapers, waveguides, and crystal detectors is used to measure the signal power in 4 separate frequency channels between 7 and 110 GHz. For typical rms bunch lengths of 0.5-2 mm in the SLC, the bunch frequency spectrum can extend up to 100 GHz. In this paper, we present the overall monitor layout, describe MAFIA calculations of the signal coupled into the waveguide based on a detailed model of the complex beam-pipe geometry, estimate the final power level at the RF conversion points, and report the measured transmission properties of the installed waveguide system. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Zimmermann, F (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 2189 EP 2191 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800708 ER PT B AU Tatchyn, R AF Tatchyn, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Analysis of a novel diffractive scanning-wire Beam Position Monitor (BPM) for discriminative profiling of electron vs. x-ray beams SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Recent numerical studies of Free Electron Lasers (FELs) operating in the Self Amplified Spontaneous Emission (SASE) regime indicate a large sensitivity of the gain to the degree of transverse overlap (and associated phase coherence) between the electron and photon beams traveling down the insertion device. Simulations of actual systems imply that accurate detection and correction for this relative loss of overlap, rather than correction for the absolute departure of the electron beam from a fixed axis, is the preferred function of an FEL amplifier's Beam Position Monitor (BPM) and corrector systems. In this note we propose a novel diffractive BPM with the capability of simultaneously detecting and resolving the absolute (and relative) transverse positions and profiles of electron and x-ray beams co-propagating through an undulator. We derive the equations governing the performance of the BPM and examine its predicted performance for the SLAG Linac Coherent Light Source (LCLS), viz., for profiling multi-GeV electron bunches co-propagating with one-to-several-hundred keV x-ray beams. Selected research and development (r&d) tasks for fabricating and testing the proposed BPM are discussed. C1 Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. RP Tatchyn, R (reprint author), Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, 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 0-7803-4376-X PY 1998 BP 2192 EP 2194 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800709 ER PT B AU Tatchyn, R AF Tatchyn, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Analysis of a single-shot longitudinal bunch profiling system based on an ultra-short pulse Ti : sapphire laser SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Recent advances in ultra-short pulse high-power laser technology include the generation of <10 fs pulses at 1 mu wavelengths in the multi-terawatt regime. These parameters, coupled with the high per-pulse energy of the new sources, make possible the consideration of longitudinal bunch profiling schemes capable of accurately registering the longitudinal bunch density in a single shot. In this paper we assess the performance and advantages of a longitudinal bunch profiling system based on multi-photon absorption and fluorescence stimulated by the combined bunch and laser fields in a gaseous medium. C1 Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. RP Tatchyn, R (reprint author), Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2195 EP 2197 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800710 ER PT B AU Denard, JC Piot, P Capek, K Feldl, E Jefferson, T AF Denard, JC Piot, P Capek, K Feldl, E Jefferson, T BE Comyn, M Craddock, MK Reiser, M Thomson, J TI High power beam profile monitor with optical transition radiation SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A simple monitor has been built to measure the profile of the high power beam (800 kW) delivered by the CEBAF accelerator at Jefferson Lab. The monitor uses the optical part of the forward transition radiation emitted from a thin carbon foil. The small beam size to be measured, about 100 mu m, is challenging not only for the power density involved but also for the resolution the instrument must achieve. An important part of the beam instrumentation community believes the radiation being emitted into a cone of characteristic angle 1/gamma is originated from a region of transverse dimension roughly lambda gamma; thus the apparent size of the source of transition radiation would become very large for highly relativistic particles. Our monitor measures 100 mu m beam sizes that are much smaller than the 3.2 mm lambda gamma limit; it confirms the statement of Rule and Fiorito that optical transition radiation can be used to image small beams at high energy. The present paper describes the instrument and its performance. We tested the foil in, up to 180 mu A of CW beam without causing noticeable beam loss, even at 800 MeV, the lowest CEBAF energy. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Denard, JC (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 4 TC 4 Z9 4 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2198 EP 2200 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800711 ER PT B AU Dunham, B Engwall, D Hofler, A Keesee, M Legg, R AF Dunham, B Engwall, D Hofler, A Keesee, M Legg, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An emittance measurement system for a wide range of bunch charges SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB As a part of the emittance measurements planned for the FEL injector at the Thomas Jefferson National Accelerator Facility (Jefferson Lab), we have developed an emittance measurement system that covers the wide dynamic range of bunch charges necessary to fully characterize the high-DC-voltage photocathode gun. The measurements are carried out with a variant of the classical two-slit method using a slit to sample the beam in conjunction with a wire scanner to measure the transmitted beam profile. The use of commercial, ultra-low noise picoammeters makes it possible to cover the wide range of desired bunch charges, with the actual measurements made over the range of 0.25 pC to 125 pC. The entire system, including its integration into the EPICS control system, is discussed. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Dunham, B (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, 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 0-7803-4376-X PY 1998 BP 2201 EP 2203 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800712 ER PT B AU Piot, P Song, J Li, R Krafft, GA Kehne, D Jordan, K Feldl, E Denard, JC AF Piot, P Song, J Li, R Krafft, GA Kehne, D Jordan, K Feldl, E Denard, JC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A multislit transverse-emittance diagnostic for space-charge-dominated electron beams SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Jefferson Lab is developing a 10 MeV injector to provide an electron beam for a high-power free-electron laser (FEL). To characterize the transverse phase space of the space-charged-dominated beam produced by this injector, we designed an interceptive multislit emittance diagnostic. It incorporates an algorithm for phase-space reconstruction and subsequent calculation of the Twiss parameters and emittance for both transverse directions at an update rate exceeding 1 Hz, a speed that will facilitate the transverse-phase-space matching between the injector and the FEL's accelerator that is critical for proper operation. This paper describes issues pertaining to the diagnostic's design. It also discusses the acquisition system, as well as the software algorithm and its implementation in the FEL control system. First results obtained from testing this diagnostic in Jefferson Lab's Injector Test Stand are also included. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Piot, P (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2204 EP 2206 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800713 ER PT B AU Yang, BX Lumpkin, AH Goeppner, GA Sharma, S Rotela, E Sheng, IC Moog, E AF Yang, BX Lumpkin, AH Goeppner, GA Sharma, S Rotela, E Sheng, IC Moog, E BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Status of the APS diagnostics undulator beamline SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We report the status of the diagnostics undulator beamline for the Advanced Photon Source (APS) storage ring. The beamline was designed for the characterization of the 7-GeV, low-emittance positron beam at high resolution. The special diagnostics undulator has been manufactured by STI Optronics. The device exhibits very low magnetic field errors at closed gap of 10.5 mm: first field integral less than 15 gauss.cm, and optical phase error less than 1.5 degrees. The front end of the beamline and a monochromator are installed and tested for use on divergence and directional stability measurements with a target resolution of 3 mu rad utilizing the first harmonic radiation of 25 keV. Initial results for the divergence measurement show that the storage ring is operating well within its design goals. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Yang, BX (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 6 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2207 EP 2209 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800714 ER PT B AU Shu, DM Barraza, J Kuzay, TM Naylor, G Elleaume, P AF Shu, DM Barraza, J Kuzay, TM Naylor, G Elleaume, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Tests of the APS X-ray transmitting beam position monitors at ESRF SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Two different types of synthetic diamond-based X-ray transmitting beam position monitor (XBPM) prototypes have been studied with an undulator white beam at the European Synchrotron Radiation Facility (ESRF) ID-6 beamline. Of particular interest was the possibility of designing an integral window and filter/photon beam position monitor for the Advanced Photon Source (APS) high heat flux insertion device beamlines. The photoelectron-emission type transmitting XBPM prototype uses a 25-mm-diameter, 175-micron-thick CVD-diamond disk with 0.2-micron-thick electrically isolated patterns of aluminum coating on one side of the diamond disk. The photoelectron emission signal was collected from the aluminum-coat surface to provide the beam position information. A novel photoconductive-type transmitting XBPM prototype uses the same CVD-diamond disk, but patterns of aluminum coating were applied on both sides of the diamond disk. A DC bias voltage was used to generate the current signal, which is based on photoconductive properties of the CVD-diamond. Test results are presented in the paper. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Shu, DM (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Av, 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 0-7803-4376-X PY 1998 BP 2210 EP 2212 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800715 ER PT B AU Brown, KA Chiang, IH Pendzick, A Tallerico, T AF Brown, KA Chiang, IH Pendzick, A Tallerico, T BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Observations of secondary emission chamber degradation from very high intensity proton beams at the AGS SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Brown, KA (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2213 EP 2214 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800716 ER PT B AU Shea, TJ Witkover, RL Cameron, P Connolly, R Ryan, WA Smith, GA Zitvogel, E AF Shea, TJ Witkover, RL Cameron, P Connolly, R Ryan, WA Smith, GA Zitvogel, E BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Performance of the RHIC injection line instrumentation systems SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The beam injection line from the Alternating Gradient Synchrotron (AGS) to the Relativistic Heavy Ion Collider (RHIC) transports proton and heavy ion bunches. This line and the RHIC first sextant currently contain the following complement of beam instrumentation: stripline position monitors, ionization loss monitors, video profile monitors, and commercial current transformers. Over several years, these systems have been designed and bench tested to assure a desired performance level. Using data from laboratory tests and the recent single pass beam tests, attained performance will be reported. Finally, experience from the beam based tests will be applied to the design criteria for the future collider ring instrumentation. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Shea, TJ (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 0-7803-4376-X PY 1998 BP 2215 EP 2217 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800717 ER PT B AU Witkover, R Zitvogel, E Michnoff, R AF Witkover, R Zitvogel, E Michnoff, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI RHIC beam loss monitor system design SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Beam Loss Monitor (BLM) System is designed to prevent the quenching of RHIC magnets due to beam loss, provide quantitative loss data, and the loss history in the event of a beam abort. The system uses 400 ion chambers of a modified Tevatron design. To satisfy fast (single turn) and slow (100 msec) loss beam criteria and provide sensitivity for studies measurements, a range of over 8 decades is needed. An RC pre- integrator reduces the dynamic range for a low current amplifier. This is digitized for data logging.. The output is also applied to an analog multiplier which compensates the energy dependence, extending the range of the abort comparators. High and low pass filters separate the signal to dual comparators with independent programmable trip levels. Up to 64 channels, on 8 VME boards, are controlled by a micro-controller based VME module, decoupling it from the front-end computer (FEC) for real-time operation. Results with the detectors in the RHIC Sextant Test and the electronics in the AGS-to-RHIC (AtR) transfer line will be presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Witkover, R (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 0-7803-4376-X PY 1998 BP 2218 EP 2220 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800718 ER PT B AU Hahn, AA AF Hahn, AA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Online calculation of Tevatron collider luminosity using accelerator instrumentation SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The luminosity of a collision region may be calculated if one understands the lattice parameters and measures the beam intensities, the transverse and longitudinal emittances, and the individual proton and antiproton beam trajectories (space and time) through the collision region. This paper explores an attempt to make this calculation using beam instrumentation during Run Ib of the Tevatron. The instrumentation used is briefly described. The calculations and their uncertainties are compared to luminosities calculated independently by the Collider Experiments (CDF and DO). C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Hahn, AA (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 2226 EP 2228 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800721 ER PT B AU Gilpatrick, JD Hodapp, TR Johnson, KF Martinez, DG Martinez, RP Power, JF Rose, CR Shafer, RE Shurter, RB Stettler, M AF Gilpatrick, JD Hodapp, TR Johnson, KF Martinez, DG Martinez, RP Power, JF Rose, CR Shafer, RE Shurter, RB Stettler, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI LEDA and APT beam diagnostics instrumentation SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A 20-MeV 100-mA-cw proton-accelerator, Low Energy Demonstration Accelerator (LEDA), is presently being developed, fabricated, and tested at Los Alamos National Laboratory (LANL). The beam diagnostic instrumentation for LEDA and the final 1700-GeV Accelerator Production of Tritium (APT) are classified into two categories: operation and characterization instrumentation. The operational instrumentation does not intercept or minimally-intercepts the beam and are sufficiently prompt and robust to provide accurate information to the operators and commissioners during full-current cw beam operation. The characterization instrumentation, primarily utilized during commissioning project-phases, operates under more traditional 100-mA-peak and approximately 0.1-mA-average beam-current conditions. This paper will review some of the LEDA and APT operational beam diagnostic instrumentation. C1 Los Alamos Natl Lab, Los Alamos, NM 87505 USA. RP Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87505 USA. EM gilpatrick@lanl.gov; jpower@lanl.gov; crose@lanl.gov; rshafer@lanl.gov; shurter@lanl.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 0-7803-4376-X PY 1998 BP 2232 EP 2234 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800723 ER PT B AU Chin, MJ Hinkson, JA AF Chin, MJ Hinkson, JA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI PEP-II bunch-by-bunch current monitor SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB PEP-II is an asymmetric B-Factory that will have 2200 meter rings storing 9 GeV electrons and 3.1 GeV positrons, each with as many as 3492 beam bunches. To minimize beam-beam instabilities it is important to have equal bunch charge in each ring. This is accomplished by measuring the relative bunch charge and controlling injection timing and intensity. Because there may be a variety of bunch patterns, the bunch monitors are designed to measure beam in every possible bucket. Results of bunch amplitude measurements with a resolution of >9 bits are available to the injection control system at rates up to 66 Hz. The bunch monitor hardware consists of beam pickups, front end filter/combiners, 1428 MHz down-converters, 1 GHz video detectors, and two VXI systems. In this paper we report on the bunch monitor design. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Chin, MJ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2235 EP 2237 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800724 ER PT B AU Fisher, AS Alzofon, D Arnett, D Bong, EL Brugnoletti, B Collins, B Daly, E Gioumousis, A Johnson, R Kulikov, A Kurita, N Langton, J McCormick, D Noriega, R Smith, S Smith, V Stege, R Bjork, M Chin, M Hinkson, J McGill, R Suwada, T AF Fisher, AS Alzofon, D Arnett, D Bong, EL Brugnoletti, B Collins, B Daly, E Gioumousis, A Johnson, R Kulikov, A Kurita, N Langton, J McCormick, D Noriega, R Smith, S Smith, V Stege, R Bjork, M Chin, M Hinkson, J McGill, R Suwada, T BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design and initial commissioning of beam diagnostics for the PEP-II B factory SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB PEP II is a 2.2-km-circumference collider with a 2.1-A, 3.1-GeV positron ring (the Low-Energy Ring) 1 m above a 1-A, 9-GeV electron ring (the High-Energy Ring); both are designed for 3 A maximum. We describe the beam diagnostics for HER commissioning, starting in May 1997. LER commissioning will follow in 1998. The beam size and pulse duration are measured using near-UV synchrotron light extracted by grazing-incidence mirrors that must withstand 200 W/cm. To measure the charge in every bucket at 60 Hz with an accuracy of .0.5%, the sum signal from a set of 4 pickup buttons is digitized and averaged over 256 samples per bucket. The sum is normalized to the ring current, measured by a DC current transformer. The 300 beam-position monitors per ring are multiplexed to share 171 processor modules, which use DSPs for recording positions over 1024 turns and for calibration. For diagnostics and machine protection, 100 photomultiplier-based Cherenkov detectors measure beam losses and abort the beam in case of high loss. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Fisher, AS (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 6 TC 1 Z9 1 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2253 EP 2255 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800730 ER PT B AU Nantista, C Adolphsen, C AF Nantista, C Adolphsen, C BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam current monitors in the NLCTA SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The current profile along the 126 ns, multi-bunch beam pulse in the Next Linear Collider Test Accelerator (NLCTA) is monitored with fast toroids (rise time similar to 1 ns). Inserted at several positions along the beam line, they allow us to track current transmission as a function of position along the bunch train. Various measurements, such as rise time, current, width, and slope, are made on the digitized signals, which can be corrected in software by means of stored frequency response files. The design and implementation of these devices is described. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Nantista, C (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, POB 4349, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 2256 EP 2258 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800731 ER PT B AU Chao, YC AF Chao, YC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Methods of orbit correction system optimization SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Extracting optimal performance out of an orbit correction system is an important component of-accelerator design and evaluation. The question of effectiveness vs, economy, however, is not always easily tractable. This is especially true in cases where betatron function magnitude and phase advance do not have smooth or periodic dependencies on the physical distance. In this report a program is presented using linear algebraic techniques to address this problem. A systematic recipe is given, supported with quantitative criteria, for arriving at an orbit correction system design with the optimal balance between performance and economy. The orbit referred to in this context can be generalized to include angle, path length, orbit effects on the optical transfer matrix, and simultaneous effects on multiple pass orbits. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Chao, YC (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave,MS 58, Newport News, VA 23606 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 0-7803-4376-X PY 1998 BP 2262 EP 2264 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800733 ER PT B AU Hardy, D Tang, J Legg, R Tiefenback, M Crofford, M Krafft, GA AF Hardy, D Tang, J Legg, R Tiefenback, M Crofford, M Krafft, GA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Automated path length and M-56 measurements at Jefferson Lab SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Accurate measurement of path length and path length changes versus momentum (M-56) are critical for maintaining minimum beam energy spread in the CEBAF (Continuous Electron Beam Accelerator Facility) accelerator at the Thomas Jefferson National Accelerator Facility (Jefferson Lab). The relative path length for each circuit of the beam (1256m) must be equal within 1.5 degrees [1] of 1497 MHz RF phase. A relative path length measurement is made by measuring the relative phases of RF signals from a cavity that is separately excited for each pass of a 4.2 mu s pulsed beam. This method distinguishes the path length to less than 0.5 degrees of RF (<280 mu m) and gives the direction of the path length error. The development of a VME based automated measurement system for path length and M-56 has contributed to faster machine setup time and has the potential for use as a feedback parameter for automated control. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Hardy, D (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2265 EP 2267 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800734 ER PT B AU Krafft, GA AF Krafft, GA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Analyzing measurements of nonlinear transfer functions with Tschebyshev polynomials SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Recently, due to advances in computers and data aquisition systems, the following type of measurement has become more common: (I) Impress a given modulation on a device to be tested. (2) Acquire a data stream, usually at equally spaced sample intervals, of the response of the system to the modulation. (3) Fit the data thereby acquired to some nonlinear function set that might (or might not!) describe the response of the device. In this paper it is pointed out that by choosing to modulate the test parameter sinusoidally, and by fast-Fourier transforming the acquired data stream, one unambiguously determines the Tschebyshev expansion of the response function around the working point, potentially yielding quantitative information about high nonlinear orders in the system response. The need for data fitting is thereby eliminated. A detailed example, the analysis of the nonlinear phase-phase transfer function in the Jefferson Lab injector, is presented. C1 TJNAF, Newport News, VA 23606 USA. RP Krafft, GA (reprint author), TJNAF, 12000 Jefferson Ave, Newport News, VA 23606 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 0-7803-4376-X PY 1998 BP 2268 EP 2270 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800735 ER PT B AU Tiefenback, MG Brown, K AF Tiefenback, MG Brown, K BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam-based phase monitoring and gradient calibration of Jefferson Laboratory RF systems SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Beam-based monitoring was instituted at Jefferson Lab in December of 1994 to correct the RF system phase setpoints against drifts of the master oscillator system, while running transparently to normal beam setup and delivery operations. As then implemented, the master oscillator distribution was subject to large thermal drifts, but no means existed of tracking the distribution of drifts, nor of identifying phase errors for individual cavities following maintenance activities. The background process implemented is capable of cresting each of the 312 cavities in the linacs to within approximately +/-2 degrees. In addition, during dedicated system measurement operations, the RF cavity gradients have been calibrated with beam to within a tolerance of approximately +/-5%. These beam-based results are in many cases more than 20% different from commissioning results using RF measurement techniques. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Tiefenback, MG (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2271 EP 2273 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800736 ER PT B AU Carwardine, J Decker, G Evans, K Hillman, A Lenkszus, F Merl, R Pietryla, A AF Carwardine, J Decker, G Evans, K Hillman, A Lenkszus, F Merl, R Pietryla, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Commissioning of the APS real-time orbit feedback system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A unified global and local closed-orbit feedback system has been implemented at the Advanced Photon Source in order to stabilize both particle and photon beams. Beam stability requirements in the band up to 50Hz are 17 mu m in the horizontal plane and 4.4 mu m vertically. Orbit feedback algorithms are implemented digitally using multiple digital signal processors, with computing power distributed in 20 VME crates around the storage ring. Each crate communicates with all others via a fast reflective memory network. The system has access to 320 rf beam position monitors together with x-ray beam position monitors in both insertion device and bending magnet beamlines. Up to 317 corrector magnets are available to the system. The global system reduces horizontal rms beam motion at the x-ray source points by more than a factor of two in the frequency band from 10mHz to 50Hz. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Carwardine, J (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2281 EP 2283 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800739 ER PT B AU Teytelman, D Claus, R Fox, J Hindi, H Larsen, R Linscott, I Prabhakar, S Ross, W Young, A Drago, A Serio, M Stover, G AF Teytelman, D Claus, R Fox, J Hindi, H Larsen, R Linscott, I Prabhakar, S Ross, W Young, A Drago, A Serio, M Stover, G BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Control of multibunch longitudinal instabilities and beam diagnostics using a DSP-based feedback system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A bunch-by-bunch longitudinal feedback system has been designed and built to control coupled-bunch instabilities in the PEP-II machine. A prototype system has been installed at the Advanced Light Source at LBNL. programmable DSPs allow longitudinal feedback processing in conjunction with data acquisition or instrumentation algorithms. Here we describe techniques developed for different beam and system diagnostics, such as measurements of the modal growth and damping rates and measurements of the bunch-by-bunch currents. Results from the Advanced Light Source are presented to illustrate these techniques. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Teytelman, D (reprint author), Stanford Linear Accelerator Ctr, POB 4349, Stanford, CA 94309 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2284 EP 2286 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800740 ER PT B AU Singh, O Tang, Y Ramamoorthy, S Krinsky, S Yu, LH AF Singh, O Tang, Y Ramamoorthy, S Krinsky, S Yu, LH BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Global orbit feedback utilizing analog and digital technologies SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB At the NSLS, an analog global orbit feedback system is used in regular operations, and a digital global orbit feedback system is available in machine physics studies on the X-Ray Ring. Here, we discuss the relative merits of utilizing analog and digital technology in orbit feedback. Results of experiments are reported characterizing the performance of our analog and digital systems when operated individually or together. We give our thoughts on plans for future development of the orbit feedback systems at the NSLS. C1 Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. RP Singh, O (reprint author), Brookhaven Natl Lab, NSLS, 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 0-7803-4376-X PY 1998 BP 2287 EP 2289 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800741 ER PT B AU Carwardine, J Evans, K AF Carwardine, J Evans, K BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Evaluation of the global orbit correction algorithm for the APS real-time orbit feedback system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The APS real-time orbit feedback system uses 38 correctors per plane and has available up to 320 rf beam position monitors. Orbit correction is implemented using multiple digital signal processors. Singular value decomposition is used to generate a correction matrix from a linear response matrix model of the storage ring lattice. This paper evaluates the performance of the APS system in terms of its ability to correct localized and distributed sources of orbit motion. The impact of regulator gain and bandwidth, choice of beam position monitors, and corrector dynamics are discussed. The weighted least-squares algorithm is reviewed in the context of local feedback. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Carwardine, J (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 2290 EP 2292 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800742 ER PT B AU Doose, C Kim, SH AF Doose, C Kim, SH BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Characterization and equalization of the AC responses of the corrector magnets for the APS local orbit feedback system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Local feedback for the APS storage ring uses local bumps to control the position and angle of the positron beam through each x-ray source point. Induced eddy currents in the aluminum vacuum chamber dominate the AC characteristics of the corrector magnetic fields. Small differences in the geometries at each magnet location change the eddy current effects and result in bump closure errors which must be reduced in order to minimize the coupling between each of the many local loops and the global control loop. By a combination of flux-damping coils, flux-shielding copper sheets, and a set of steel laminations for end-flux damping, the differences of the eddy current effects between two corrector magnets were reduced from 0.18 Gm/A to 0.035 Gm/A in the frequency span of 0.1-100 Hz. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Doose, C (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2293 EP 2295 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800743 ER PT B AU Schwartz, C Nassiri, A Kang, Y Kustom, RL AF Schwartz, C Nassiri, A Kang, Y Kustom, RL BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Simulation of the APS storage-ring RF system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A simulation model for the APS storage ring rf system has been developed that includes the effects of cavity impedances, longitudinal beam dynamics, and generator klystrons. The model predicts multiple-bunch longitudinal beam behavior and is used for feedback system design and stability analysis. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Schwartz, C (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 0-7803-4376-X PY 1998 BP 2296 EP 2298 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800744 ER PT B AU Smith, TL AF Smith, TL BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Multiple control for feedback tuning of the advanced photon source storage ring/booster RF cavities SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A method for tuning rf cavities that has fewer rf reflected power conditions and is easier for accelerator operators to use is presented. This method will also prepare the rf cavity tuning for future higher beam currents. The results and installation methods are discussed. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Smith, TL (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. 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 0-7803-4376-X PY 1998 BP 2299 EP 2301 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800745 ER PT B AU Brown, KA Smith, G Wong, V AF Brown, KA Smith, G Wong, V BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An example of a digital synthesis approach to DSP design: The AGS transverse damper SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Brown, KA (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 0-7803-4376-X PY 1998 BP 2302 EP 2304 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800746 ER PT B AU Klaffky, RW Broome, W D'Alsace, R Kramer, SL Thomas, MG Wang, JM AF Klaffky, RW Broome, W D'Alsace, R Kramer, SL Thomas, MG Wang, JM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Longitudinal coupled bunch instabilities on the NSLS X-ray ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Studies have demonstrated that an 862 MHz RF cavity higher order mode (HOM) cause longitudinal coupled-bunch (LCB) dipole and quadrupole oscillations at specific RF tuner positions with associated increases in longitudinal, horizontal, and vertical electron beam sizes. In the XRF2 cavity a reconfiguration of damping antennae removed the 862 MHz HOM. High speed I(t) stripline measurements showed that a strong quadrupole oscillation resulted when the HOM was induced in the XRF3 cavity. The reason that a symmetric six bunch pattern was found to be effective in damping this mode is explained. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. RP Klaffky, RW (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2305 EP 2307 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800747 ER PT B AU Marneris, I Danowski, G Sandberg, J Soukas, A AF Marneris, I Danowski, G Sandberg, J Soukas, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI AGS slow extracted beam improvement SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Brookhaven AGS is a strong focusing accelerator which is used to accelerate protons and various heavy ion species to an equivalent proton energy of 29 Gev. Since the late 1960's it has been serving high energy physics (HEF - proton beam) users of both slow and fast extracted beams. The AGS fixed target program presently uses primary proton and heavy ion beams (HIP) in slowly extracted fashion over spill lengths of 1.5 to 4.0 seconds. Extraction is accomplished by flattoping the main and extraction magnets and exciting a third integer resonance in the AGS. Over the long spill times, control of the subharmonic amplitude components up to a frequency of 1 kilohertz is very crucial. One of the most critical contributions to spill modulation is due to the AGS MPS. An active filter was developed to reduce these frequencies and it's operation is described in a previous paper [1]. However there are still frequency components in the 60-720 Hz sub-harmonic ripple range, modulating the spill structure due to extraction power supplies and any remaining structures on the AGS MMPS. A recent scheme is being developed to use the existing tune-trim control horizontal quadrupole magnets and power supply to further reduce these troublesome noise sources. Feedback from an external beam sensor and overcoming the limitations of the quadrupole system by lead/lag compensation techniques will be described. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Marneris, I (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2308 EP 2310 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800748 ER PT B AU Assadi, S Kourbanis, I McGinnis, D Steimel, J AF Assadi, S Kourbanis, I McGinnis, D Steimel, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Observation and cure of longitudinal coupled-bunch instabilities in the Fermilab Main Ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB One goal of the Fermilab Main Ring accelerator during the Fixed target run is to keep the longitudinal beam oscillations as small as possible. It is found that when the proton beam intensity reaches a certain value, longitudinal beam oscillations rapidly grow. This motion can be explained by the longitudinal beam instability model. Installed active feedback system has successfully eliminated the instabilities and record intensities are achieved. We discuss the observations that indicate the damper systems are necessary. The results of the instability growth measurements are compared with a simple model. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Assadi, S (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2323 EP 2325 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800753 ER PT B AU Chase, BE Barnes, B Meisner, K AF Chase, BE Barnes, B Meisner, K BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Digital Low Level RF systems for Fermilab Main Ring and Tevatron SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB New Low Level RF systems are successfully operating the FermiIab Main Ring and Tevatron. The upgrade replaces aging CAMAC and NIM components, and increases system accuracy, reliability, and flexibility. VXI LLRF systems feature a custom three channel direct digital synthesizer (DDS) module capable of independent or ganged operation in both frequency and phase modulation. Frequency and phase values are computed at 100Khz by the module's Analog Devices ADSP21062 (SHARC) digital signal processor. The DSP concurrently handles feedforward, feedback, and beam manipulations. Higher level state machines and the control system interface are handled at the crate level using the VxWorks operating system. This paper discusses the hardware, software, and operational aspects of these LLRF systems. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Chase, BE (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 2 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2326 EP 2328 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800754 ER PT B AU Regan, A Ziomek, C AF Regan, A Ziomek, C BE Comyn, M Craddock, MK Reiser, M Thomson, J TI APT LLRF control system model results SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The low-lever RF (LLRF) control system is an essential component of the RF system for the Accelerator Production of Tritium (APT). Requisite for good performance at a reasonable cost is system modeling prior to actual hardware build. Models have been created to help establish the LLRF control system baseline design. These models incorporate common signal processing functions and control functions as well as mixed continuous and discrete-time analysis. Components include klystron saturation curves, waveguide delays, realistic resonant cavity equivalents, and LLRF proportional, integral, and differential (PID) control transfer functions. They predict the performance of the LLRF system in the presence of beam noise, excitation of non-fundamental modes which occur in the superconducting cavities, and pursed beam situations.,, This paper will describe the basic model and will present results for a variety of operating scenarios. C1 Univ Calif Los Alamos Natl Lab, LANSCE Div, Los Alamos, NM 87544 USA. RP Regan, A (reprint author), Univ Calif Los Alamos Natl Lab, LANSCE Div, POB 1663, Los Alamos, NM 87544 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 0-7803-4376-X PY 1998 BP 2338 EP 2340 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800758 ER PT B AU Wang, YM Regan, A AF Wang, YM Regan, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Algorithms and implementations of APT resonant control system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A digital signal processor is implemented to control the resonant frequency of the RFQ prototype in APT/LEDA. Two schemes are implemented to calculate the resonant frequency of the RFQ. One uses the measurement of the forward and reflected fields. The other uses the measurement of the forward and transmitted fields. The former is sensitive and accurate when the operation frequency is relatively far from the resonant frequency. The latter gives accurate results when the operation frequency is close to the resonant frequency. Linearized algorithms are derived to calculate the resonant frequency of the RFQ efficiently using a fixed-point DSP. The control frequency range is about 100kHz for 350MHz operation frequency. A frequency agile scheme is employed using a dual direct digital synthesizer to drive the klystron at the cavity's resonant frequency (not necessarily the required beam resonant frequency) in power-up mode to quickly bring the cavity to the desired resonant beam frequency. This paper will address the algorithm implementation and error analysis, as well as related hardware design issues. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Wang, YM (reprint author), Univ Calif 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 0-7803-4376-X PY 1998 BP 2341 EP 2343 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800759 ER PT B AU Barry, W Corlett, J Fahmie, M Greer, J Lambertson, G Pike, C AF Barry, W Corlett, J Fahmie, M Greer, J Lambertson, G Pike, C BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Status of the PEP-II transverse feedback systems SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The feedback systems for controlling transverse coupled-bunch instabilities in both the high and low energy rings of the PEP-II collider are complete and installed on site. Presently, the high energy ring of the collider is beginning commissioning. The commissioning of the high energy ring transverse feedback system is expected to begin sometime in the next few weeks. Design specifications and the basic system concept are reviewed. Selected bench-test results for various system components are discussed including results from the sum-signal orbit offset cancellation electronics. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Barry, W (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2344 EP 2346 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800760 ER PT B AU Corredoura, P Allison, S Claus, R Ross, W Sapozhnikov, L Schwarz, HD Tighe, R Yee, C Ziomek, C AF Corredoura, P Allison, S Claus, R Ross, W Sapozhnikov, L Schwarz, HD Tighe, R Yee, C Ziomek, C BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Commissioning experience with the PEP-II low-level RF system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The low-level RF system for PEP-II is a modular design housed in a VXI environment and supported by EPICS. All signal processing and control is done at baseband using in-phase and quadrature (IQ) techniques. Remotely configurable RF feedback loops are used to control coupled-bunch instabilities driven by the accelerating mode of the RF cavities. A programmable DSP based feedback loop is implemented to control DC phase variations across the klystron and to adaptively cancel modulations caused by klystron power supply ripple at selected power line harmonics between 60 Hz and 10 kHz. The system contains a built-in baseband network analyzer which allows remote measurement of the RF feedback loop transfer functions and automated configuration of these loops. This paper presents observations and measured data from the system. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Corredoura, P (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2359 EP 2361 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800765 ER PT B AU Hindi, H Prabhakar, S Fox, J Teytelman, D AF Hindi, H Prabhakar, S Fox, J Teytelman, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design and verification of controllers for longitudinal oscillations using optimal control theory and numerical simulation: Predictions for PEP-II SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We present a technique for the design and verification of efficient bunch-by-bunch controllers for damping longitudinal multibunch instabilities. The controllers attempt to optimize the use of available feedback amplifier power one of the most expensive components of a feedback system - and define the limits of closed loop system performance. Our design technique alternates between analytic computation of single bunch optimal controllers and verification on a multibunch numerical simulator. The simulator identifies unstable coupled bunch modes and predicts their growth and damping rates. The results from the simulator are shown to be in reasonable agreement with analytical calculations based on the single bunch model. The technique is then used to evaluate the performance of a variety of controllers proposed for PEP-II. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Hindi, H (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2362 EP 2364 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800766 ER PT B AU Ross, W Claus, R Sapozhnikov, L AF Ross, W Claus, R Sapozhnikov, L BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Gap Voltage Feed-Forward module for PEP-II low level RF system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Gap Voltage Feed-Forward (GVFF) Module produces adaptively generated inphase (I) and quadrature (Q) reference signals for a single RF station. This module measures the periodic (l-turn) beam induced cavity transients caused by the presence of an ion clearing gap in the beam. A reference waveform is generated to minimize the direct feedback error signal transient caused by the gap. In addition, the GVFF module receives a fiber-optically connected, band-limited 'kick' signal from the Longitudinal Feedback System. The kick signal modulates the I and Q components of the RF reference causing the station to act as a 'sub-woofer' for the Longitudinal Feedback System. This process dampens low order coupled-bunch instabilities induced by the fundamental mode of the accelerating cavities. The GVFF Module also includes hardware for remote measurement and adjustment of the 'kick' transfer function. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Ross, W (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2365 EP 2367 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800767 ER PT B AU Young, A Fox, J Teytelman, D AF Young, A Fox, J Teytelman, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI VXI based multibunch detector and QPSK modulator for the PEP-II/ALS/DA phi NE longitudinal feedback system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The PEP-II/ALS/DA Phi NE feedback systems are complex systems implemented using analog, digital and microwave circuits. The VXI hardware implementation for the Front-end and Back-end analog processing modules is presented. The Front-end module produces a baseband beam phase signal from pickups using a microwave tone burst generator. The Back-end VXI module generates an AM/QPSK modulated signal from a baseband correction signal computed in a digital signal processor. These components are implemented in VXI packages that allow a wide spectrum of system functions including a 120 MHz bandwidth rms detector, reference phase servo, woofer link to the RF control system, standard VXI status/control, and user defined registers. The details of the design and implementation of the VXI modules including performance characteristics are presented. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Young, A (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2368 EP 2370 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800768 ER PT B AU Karn, J Chowdhary, M Hutton, A Lebedev, V Legg, R Letta, P Shoaee, H Watson, W van Zeijts, J AF Karn, J Chowdhary, M Hutton, A Lebedev, V Legg, R Letta, P Shoaee, H Watson, W van Zeijts, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Development of digital feedback systems for beam position and energy at the Thomas Jefferson National Accelerator Facility SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The development of beam-based digital feedback systems for the CEBAF accelerator has gone through several stages. As the accelerator moved from commissioning to operation for the nuclear physics program, the top priority was to stabilize;the beam against slow energy and position drifts (< 1 Hz). These slow drifts were corrected using the existing accelerator monitors and actuators driven by software running on top of the EPICS control system. With slow drifts corrected, attention turned to quantifying the higher frequency disturbances on the beam and to designing the required feedback systems needed to achieve the CEBAF design stability requirements. Results from measurements showed the major components in position and energy to be at harmonics of the power line frequencies of 60, 120, and 180 Hz. Hardware and software was installed in two locations of the accelerator as prototypes for the faster feedback systems needed. This paper gives an overview of the measured beam disturbances and the feedback systems developed. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Karn, J (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 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 0-7803-4376-X PY 1998 BP 2383 EP 2385 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800773 ER PT B AU van Zeijts, J Witherspoon, S Watson, WA AF van Zeijts, J Witherspoon, S Watson, WA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design and implementation of a slow orbit control package at Thomas Jefferson National Accelerator Facility SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We describe the design and implementation of a C++ client/server based slow orbit and energy control package based on the CDEV[1] software control bus. Several client applications are described and operational experience is given. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP van Zeijts, J (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 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 0-7803-4376-X PY 1998 BP 2386 EP 2388 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800774 ER PT B AU Hoff, LT AF Hoff, LT BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Object oriented programming interfaces for accelerator control SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A current trend in control system design is to provide an object oriented programming interface for application developers. This talk will discuss important aspects and features of object oriented APIs for accelerator control systems, and explore why such interfaces are becoming the norm. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Hoff, LT (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-4376-X PY 1998 BP 2395 EP 2397 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800777 ER PT B AU Watson, WA AF Watson, WA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A portable accelerator control toolkit SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In recent years, the expense of creating good control software has led to a number of collaborative efforts among Laboratories to share this cost. The EPICS collaboration is a particularly successful example of this trend. More recently another collaborative effort has addressed the need for sophisticated high level software, including model driven accelerator controls. This work builds upon the CDEV (Common DEVice) software framework, which provides a generic abstraction of a control system, and maps that abstraction onto a number of site-specific control systems including EPICS, the SLAG control system, CERN/PS and others. In principle, it is now possible to create portable accelerator control applications which have no knowledge of the underlying and site-specific control system. Applications based on CDEV now provide a growing suite of tools for accelerator operations, including general purpose displays, an on-line accelerator model, beamline steering, machine status displays incorporating both hardware and model information (such as beam positions overlaid with beta functions) and more. A survey of CDEV compatible portable applications will be presented, as well as plans for future development. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Watson, WA (reprint author), Thomas Jefferson Natl Accelerator Facil, 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 0-7803-4376-X PY 1998 BP 2398 EP 2402 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800778 ER PT B AU Kraimer, MR Clausen, M Lupton, W Watson, C AF Kraimer, MR Clausen, M Lupton, W Watson, C BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Experience with epics in a wide variety of applications SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID CONTROL-SYSTEM; SOFTWARE AB Currently more than 70 organizations have obtained permission to use EPICS, a set of software packages for building real-time control systems. In this paper representatives from four of these sites discuss the reasons their sites chose EPICS, provide a brief discussion of their control system development, and discuss additional control system tools obtained elsewhere or developed locally. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Kraimer, MR (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2403 EP 2409 PG 7 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800779 ER PT B AU Borland, M AF Borland, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The procedure execution manager and its application to advanced photon source operation SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Procedure Execution Manager (PEM) combines a complete scripting environment for coding accelerator operation procedures with a manager application for executing and monitoring the procedures. PEM is based on Tcl/Tk, a supporting widget library and the dp-tcl extension for distributed processing. The scripting environment provides support for distributed, parallel execution of procedures along with join and abort operations. Nesting of procedures is supported, permiting the same code to run as a top-level procedure under operator control or as a subroutine under control of another procedure. The manager application allows an operator to execute one or more procedures in automatic, semi-automatic, or manual modes. It also provides a standard way for operators to interact with procedures. A number of successful applications of PEM to accelerator operations have been made to date. These include start-up, shutdown, and other control of the positron accumulator ring (PAR), low-energy transport (LET) lines, and the booster rf systems. The PAR/LET procedures make nested use of PEM's ability to run parallel procedures, There are also a number of procedures to guide and assist tune-up operations, to make accelerator physics measurements, and to diagnose equipment. Because of the success of the existing procedures, expanded use of PEM is planned. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Borland, M (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 2410 EP 2412 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800780 ER PT B AU Chan, A Crane, G MacGregor, I Meyer, S AF Chan, A Crane, G MacGregor, I Meyer, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Data warehouse on the web for accelerator fabrication and maintenance SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A data warehouse grew out of the needs for a view of accelerator information from a lab-wide or project-wide standpoint (often needing off-site data access for the multi-lab PEP-II collaborators). A World Wide Web interface is used to link legacy database systems of the various labs and departments related to the PEP-II Accelerator. In this paper, we describe how links are made via the 'Formal Device Name' field(s) in the disparate databases. We also describe the functionality of a data warehouse in an accelerator environment. One can pick devices from the PEP-II Component List and find the actual components filling the functional slots, any calibration measurements, fabrication history, associated cables and modules, and operational maintenance records for the components. Information on inventory, drawings, publications, and purchasing history are also part of the PEP-II Database [1]. A strategy of relying on a small team, and of linking existing databases rather than rebuilding systems is outlined. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Chan, A (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 2413 EP 2415 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800781 ER PT B AU White, G Himel, T Shoaee, H AF White, G Himel, T Shoaee, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A hybrid numerical method for orbit correction SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We describe a simple hybrid numerical method for beam orbit correction in particle accelerators. The method overcomes both degeneracy in the linear system being solved and respects boundaries on the solution. It uses the Singular Value Decomposition (SVD) to find and remove the null-space in the system, followed by a bounded Linear Least Squares analysis of the remaining recast problem. It was developed for correcting orbit and dispersion in the B-factory rings. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94305 USA. RP White, G (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94305 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 0-7803-4376-X PY 1998 BP 2425 EP 2427 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800785 ER PT B AU Graves, WS Feng, SK Pearson, PS Smith, JD AF Graves, WS Feng, SK Pearson, PS Smith, JD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Innovative aspects of the SDL control system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Source Development Lab at BNL consists of a 230 MeV electron linac and 10m long wiggler for short wavelength FEL development. The control system is based on that in use at the NSLS. Two new extensions of the control system using VXI equipment are described. The first extension is the replacement of patch panels and lab oscilloscopes to monitor RF equipment. Instead, the RF waveforms are fed through a multiplexor into VXI digitizers. The waveforms can then be monitored remotely on any control console. The second extension is the replacement of the analog RF hardware needed to process beam position monitor signals. A digital system based on very fast (sub-nanosecond) VXI waveform digitizers is under development. The difficult operations requiring precise time alignment are then done in software. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. RP Graves, WS (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, 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 0-7803-4376-X PY 1998 BP 2437 EP 2439 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800789 ER PT B AU Schaller, SC Bjorklund, EA Callaway, NT Carr, GP Faucett, JA Oothoudt, MA Ostrem, DJ AF Schaller, SC Bjorklund, EA Callaway, NT Carr, GP Faucett, JA Oothoudt, MA Ostrem, DJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Completion of the LANSCE proton storage ring control system upgrade - A successful integration of EPICS into a running control system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Los Alamos Neutron Scattering Center (LANSCE) Proton Storage Ring (PSR) control system upgrade is complete. In previous work, much of a PDP-ll-based control system was replaced with the Experimental Physics and Industrial Control System (EPICS) controls. Several parts of the old control system which used a VAX for operator displays and direct access to a CAMAC serial highway still remained. The old system was preserved as a "fallback" if the new EPICS-based system had problems. The control system upgrade completion included conversion of several application programs to EPICS-based operator interfaces, moving some data acquisition hardware to EPICS Input-Output Controllers (IOC's), and the implementation of new gateway software to complete the overall control system interoperability. Many operator interface (OPI) screens, written by LANSCE operators, have been incorporated in the new system. The old PSR control system hardware was removed. The robustness and reliability of the new controls obviated the need for a fallback capability. C1 Los Alamos Neutron Scattering Ctr, Los Alamos Neutron Sci Ctr, Los Alamos, NM 87545 USA. RP Schaller, SC (reprint author), Los Alamos Neutron Scattering Ctr, Los Alamos Neutron Sci Ctr, Los Alamos, NM 87545 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2464 EP 2466 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800798 ER PT B AU Allison, S Claus, R AF Allison, S Claus, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Operator interface for the PEP-II low level RF control system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper focuses on the operational aspects of the low level RF control system being built for the PEP-II storage rings at SLAG. Subsystems requiring major operational considerations include displays for monitor and control from UNIX workstations, slow feedback loops and control sequences residing on microprocessors, and various client applications in the existing SLAG Linear Collider (SLC) control system. Since commissioning of PEP-II RF is currently in-progress, only those parts of the control system used during this phase are discussed is detail. Based on past experience with the SLC control system, it is expected that effort expended during commissioning on a solid user interface will result in smoother transition to full reliable 24-hour-a-day operation. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 95309 USA. RP Allison, S (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 95309 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 0-7803-4376-X PY 1998 BP 2470 EP 2472 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800800 ER PT B AU Crane, M Call, M Clark, S Coffman, F Himel, T Lahey, T Miller, E Sass, R AF Crane, M Call, M Clark, S Coffman, F Himel, T Lahey, T Miller, E Sass, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Network upgrade for the SLC: PEP-II network SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The PEP-II control system required a new network to support the system functions. This network, called CTLnet, is an FDDI/Ethernet based network using only TCP/IP protocols. An upgrade of the SLC Control System micro communications to use TCP/IP and SLCNET would allow all PEP-II control system nodes to use TCP/IP. CTLnet is private and separate from the SLAG public network. Access to nodes and control system functions is provided by multi-homed application servers with connections to both the private CTLnet and the SLAG public network. Monitoring and diagnostics are provided using a dedicated system. Future plans and current status information is included. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Crane, M (reprint author), Stanford Univ, 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 0-7803-4376-X PY 1998 BP 2473 EP 2475 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800801 ER PT B AU Crane, M MacKenzie, R Sass, R Himel, T AF Crane, M MacKenzie, R Sass, R Himel, T BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Network upgrade for the SLC: Control system modifications SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Current communications between the SLAG Linear Collider control system central host and the SLCmicros is built upon the SLAG developed SLCNET communication hardware and protocols. We will describe how the Internet Suite of protocols (TCP/IP) are used to replace the SLCNET protocol interface. The major communication pathways and their individual requirements are described. A proxy server is used to reduce the number of total system TCP/IP connections. The SLCmicros were upgraded to use Ethernet and TCP/IP as well as SLCNET. Design choices and implementation experiences are addressed. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Crane, M (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2476 EP 2478 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800802 ER PT B AU Borland, M AF Borland, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Applications toolkit for accelerator control and analysis SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Advanced Photon Source (APS) has taken a unique approach to creating high-level software applications for accelerator operation and analysis. The approach is based on self-describing data, modular program toolkits, and scripts. Self-describing data provide a communication standard that aids the creation of modular program toolkits by allowing compliant programs to be used in essentially arbitrary combinations. These modular programs can be used as part of an arbitrary number of high-level applications. At APS, a group of about 70 data analysis, manipulation, and display tools is used in concert with about 20 control-system-specific tools to implement applications for commissioning and operations. High-level applications are created using scripts, which are relatively simple interpreted programs. The Tcl/Tk script language is used, allowing creating of graphical user interfaces (GUIs) and a library of algorithms that are separate from the interface. This last factor allows greater automation of control by making it easy to take the human out of the loop. Applications of this methodology to operational tasks such as orbit correction, configuration management, and data review will be discussed. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Borland, M (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2487 EP 2489 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800806 ER PT B AU Lenkszus, FR Laird, RJ AF Lenkszus, FR Laird, RJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A bunch clock for the Advanced Photon Source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A bunch clock timing module has been developed for use by Advanced Photon Source beamlines. The module provides bunch pattern and timing information that can be used to trigger beamline data collection equipment. The module is fully integrated into the control system software (EPICS) which automatically loads it with the storage ring fill pattern at injection time. Fast timing outputs (Ins FWHM) for each stored bunch are generated using the storage ring low-level rf and revolution clock as input references. Fiber-optic-based transmitters and receivers rue used to transmit a 352-MHz low-level rf reference to distributed bunch clock modules The bunch crock module is a single-width VME module and may be installed in a VME crate located near beamline instrumentation. A prototype has been in use on the SRI CAT beamline for over a year. The design and integration into the control system timing software along with measured performance results are presented. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Lenkszus, FR (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 2490 EP 2492 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800807 ER PT B AU Conkling, CR AF Conkling, CR BE Comyn, M Craddock, MK Reiser, M Thomson, J TI RHIC beam permit and quench detection communications system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A beam permit module has been developed to concentrate RHIC2 subsystem sensor outputs, permit beam, and initiate emergency shutdowns. The modules accept inputs from the vacuum, cryogenic, power supply, beam loss, and superconducting magnet quench detection systems. Modules are located at equipment locations around the RHIC ring. The modules are connected by three fiberoptic communications links; a beam permit link, and two magnet power supply interlock links. During operation, carrier presence allows beam. If a RHIC subsystem detects a fault, the beam permit carrier terminates - initiating a beam dump. If the fault was a superconducting magnet quench, a power supply interlock carrier terminates - initiating an emergency magnet power dump. In addition, the master module triggers an event to cause remote sensors to log and hold data at the time-of-failure. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Conkling, CR (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2496 EP 2498 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800809 ER PT B AU Hartmann, H AF Hartmann, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The RHIC Real Time Data Link System SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The RHIC Real Time Data Link (RTDL) System distributes to all locations around the RHIC ring machine parameters of general interest to accelerator systems and users. The system, along with supporting host interface, is centrally located. The RTDL System is comprised of two module types: the Encoder Module (V105) and the Input Module (V106). There is only one V105 module, but many (up to 128) Input Modules. Multiple buffered outputs are provided for use locally or for retransmission to other RHIC equipment locations. Machine parameters are generated from the V115 Waveform Generator Module (WFG) or from machine hardware and coupled directly through a fiber optic serial link to one of the V106 input channels. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Hartmann, H (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 0-7803-4376-X PY 1998 BP 2499 EP 2501 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800810 ER PT B AU Shea, TJ Mead, JA Cerniglia, P Degen, CM AF Shea, TJ Mead, JA Cerniglia, P Degen, CM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Evaluation of IEEE 1394 serial bus for distributed data acquisition SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB One trend in accelerator instrumentation is the digitization of signals further upstream in the signal processing chain. In some systems, this leads to distributed data sources that must be interconnected in a standard way. IEEE 1394 Serial Bus provides a possible interconnection standard for these systems. With Serial Bus, data acquisition is implemented via memory to memory transfers within a distributed 64 bit address space. Because this functionality is provided in silicon, software overhead is significantly reduced. This technology is under evaluation for use in the RHIC position monitor system. Using this example system, the suitability of IEEE 1394 for the accelerator environment will, be described. Also, the results from recent tests will be presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Shea, TJ (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 0-7803-4376-X PY 1998 BP 2502 EP 2504 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800811 ER PT B AU Rybarcyk, LJ Shelley, FE AF Rybarcyk, LJ Shelley, FE BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Improvements to the LANSCE accelerator timing system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Los Alamos Neutron Science Center (LANSCE) 800 MeV proton linear accelerator (linac) operates at a maximum repetition rate of twice the AC power line frequency, i.e. 120 Hz. The start of each machine cycle occurs a fixed delay after each zero-crossing of the AC line voltage. Fluctuations in the AC line frequency and phase are therefore present on all linac timing signals. Proper beam acceleration along the linac requires that the timing signals remain well synchronized to the AC line. For neutron chopper spectrometers, e.g., PHAROS at the Manuel Lujan Jr. Neutron Scattering Center, accurate neutron energy selection requires that precise synchronization be maintained between the beam-on-target arrival time and the neutron chopper rotor position. This is most easily accomplished when the chopper is synchronized to a stable, fixed frequency signal. A new zero-crossing circuit which employs a Phase-Locked Loop (PLL) has been developed to increase the phase and frequency stability of the linac timing signals and thereby improve neutron chopper performance while simultaneously maintaining proper linac operation. Results of timing signal data analysis and modeling and a description of the PLL circuit are presented. C1 Univ Calif Los Alamos Natl Lab, LANSCE Div, Los Alamos, NM 87545 USA. RP Rybarcyk, LJ (reprint author), Univ Calif Los Alamos Natl Lab, LANSCE Div, POB 1663, 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 0-7803-4376-X PY 1998 BP 2514 EP 2516 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800815 ER PT B AU Meyer, S Chan, A AF Meyer, S Chan, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A components database design and implementation for accelerators and detectors SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Many accelerator and detector systems being fabricated for the PEP-II Accelerator and BABAR Detector needed configuration control and calibration measurements tracked for their components. Instead of building a database for each distinct system, a Components Database was designed and implemented that can encompass any type of component and any type of measurement. In this paper we describe this database design that is especially suited for the engineering and fabrication processes of the accelerator and detector environments where there are thousands of unique component types. We give examples of information stored in the Components Database, which includes accelerator configuration, calibration measurements, fabrication history, design specifications, inventory, etc. The World Wide Web interface is used to access the data, and templates are available for international collaborations to collect data off-line. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Meyer, S (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2517 EP 2519 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800816 ER PT B AU Tighe, R AF Tighe, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI ARC detection and interlock module for the PEP-II low level RF system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A new are detection and interlock generating module for the SLAG PEP-II low-level RF VXI-based system has been developed. The system is required to turn off the RF drive and high voltage power supply in the event of arcing in the cavity windows, klystron window, or circulator. Infrared photodiodes receive are signals through radiation resistant optical.fibers. Gain and bandwidth are selectable for each channel to allow tailoring response. The module also responds to interlock requests from other modules in the VXI system and communicates with the programmable logic controller (PLC) responsible for much of the low-level RF system's interlock functionality. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Tighe, R (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2520 EP 2522 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800817 ER PT B AU Chao, YC Bowling, B van Zeijts, J Watson, WA Witherspoon, S AF Chao, YC Bowling, B van Zeijts, J Watson, WA Witherspoon, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Orbit correction using virtual monitors at Jefferson Lab SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An orbit correction algorithm is developed to achieve the following goals for the CEBAF accelerator at Jefferson Lab.: 1). Preprocessing of orbit input to account for estimated misalignment and monitor errors. 2). Automatic elimination of blind spots caused by response matrix degeneracy. 3). Transparency of exception handling to interchangeable generic steering engines. 4). CEBAF-specific demands on control of injection angle, path length, orbit effects on optics, simultaneous multiple pass steering, and orbit control at un-monitored locations. All of the above can be accomplished by the introduction of virtual monitors into the processed input orbit, whose theoretical basis is to be discussed in this report. Implementation of all or part of these features and operational experience during the CEBAF variable energy runs will also be discussed. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Chao, YC (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave,MS 58, Newport News, VA 23606 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 0-7803-4376-X PY 1998 BP 2526 EP 2528 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800819 ER PT B AU Jordan, K Evans, R Garza, O Hill, R Shinn, M Song, J Venhaus, D AF Jordan, K Evans, R Garza, O Hill, R Shinn, M Song, J Venhaus, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Pulse selection control for the IR FEL photocathode drive laser SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The method for current control of a photocathode source is described. This system allows for full remote control of a photocathode drive laser for resulting electron beam currents ranging from less than one microamp to a full current of five milliamps. All current modes are obtained by gating the drive laser with a series of electro-optical cells. The system remotely generates this control signal by assuming a mode of operation with the following properties selectable: Current mode as continuous or gated, micropulse density, macropulse gate width from single shot to 1ms duration, macropulse synchronization to A/C line voltage (60 Hz) or an external trigger, 60 Hz phase and slewing through 60 Hz when applicable. All selections are derived from programable logic devices operating from a master-oscillator resulting in a discrete, phase stable, pulse control for the drive laser. Complete system documentation is available at http://www.jlab.org/fel. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Jordan, K (reprint author), Thomas Jefferson Natl Accelerator Facil, 1200 Jefferson Ave, Newport News, VA 23606 USA. OI EVANS, ROBIN/0000-0002-7988-3189 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 0-7803-4376-X PY 1998 BP 2529 EP 2531 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800820 ER PT B AU Huang, HX Roser, T Luccio, A AF Huang, HX Roser, T Luccio, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Spin tracking study of the AGS SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In the recent polarized proton runs in the AGS, a 5% partial snake was used successfully to overcome the imperfection depolarizing resonances. Although some depolarization at intrinsic resonances are expected, the level of the depolarization does not agree with a simple model calculation. A spin tracking program is then used to simulate the real polarized proton beam in the AGS. The results show that, due to the linear coupling introduced by a solenoidal 5% partial snake, the polarized beam will be partially depolarized also at the so-called coupling resonance, which is related to the horizontal betatron tune. The synchrotron oscillation also affect the beam polarization to a smaller extent. C1 Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA. RP Huang, HX (reprint author), Assoc Univ Inc, 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 0-7803-4376-X PY 1998 BP 2538 EP 2540 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800823 ER PT B AU MacKay, WW AF MacKay, WW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An interactive beam line simulator module for RHIC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper describes the interactive simulation engine, hi, designed for the RHIC[1] project. The program tracks as output to shared memory the central orbit, Twiss and dispersion functions, as well as the 6 x 6 beam hyperellipsoid. Transfer matrices between elements are available via interactive requests. Using a 6-d model, optical elements are modeled with a linear transfer matrix and a vector. The vector allows simulation of misalignments, shifts in field strengths, and beam rigidity. Currently only a linear model is used for elements. In addition to the usual magnets, a foil element is included which can shift the beam's rigidity (resulting from a change of charge and energy loss), as well as increase the momentum spread and emittance. Running as a Glish[2] client, bl can be interfaced to other programs, such as an orbit plotter and a power supply application to give a quick prediction of the beam orbit from actual operating currents in the accelerator. Various strengths and offsets may be changed by sending Glish events to bl. C1 Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA. RP MacKay, WW (reprint author), Assoc Univ Inc, 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 0-7803-4376-X PY 1998 BP 2541 EP 2543 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800824 ER PT B AU Pilat, F Trahern, CG Wei, J Satogata, T Tepikian, S AF Pilat, F Trahern, CG Wei, J Satogata, T Tepikian, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Modeling RHIC using the Standard Machine Format accelerator description SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Standard Machine Format (SME)[1][2] is a structured description of accelerator lattices which supports both the hierarchy of beam lines and generic lattice objects as well as those deviations (field errors, alignment errors, etc.) associated with each component of the as-installed machine. In this paper we discuss the use of SMF to describe the Relativistic Heavy Ion Collider (RHIC) as well as the ancillary data structures (such as field quality measurements) that are necessarily incorporated into the RHIC SMF model. Future applications of SMF are out-lined, including its use in the RHIC operational environment. C1 Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA. RP Pilat, F (reprint author), Assoc Univ Inc, 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 0-7803-4376-X PY 1998 BP 2544 EP 2546 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800825 ER PT B AU MacLachlan, J Ostiguy, JF AF MacLachlan, J Ostiguy, JF BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Enhancements to the longitudinal dynamics code ESME SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB ESME is a program developed at Fermilab for simulating both single particle and multi-particle dynamics in proton synchrotrons. The code has evolved incrementally for more than fifteen years, accumulating many useful features and some internal inconsistency in the process. In the latest revision (8.2), a significant effort has been made to eliminate inconsistency and ambiguity in the determination of phases for multiple RF systems. The use of frequency and phase curves is now more transparent. Other additions or improvements include additional features for time domain calculation, low noise distributions to extend multi-particle capability, run-time memory allocation and portable graphics. A Web page has been established to facilitate the distribution of the source code and documentation. Further information, bug reports and fixes will be made available through this resource. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP MacLachlan, J (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. 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 0-7803-4376-X PY 1998 BP 2556 EP 2558 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800829 ER PT B AU Rusthoi, DP Lysenko, WP Crandall, KR AF Rusthoi, DP Lysenko, WP Crandall, KR BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Further improvements in TRACE 3-D SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB TRACE 3-D, an interactive beam-dynamics program that calculates the envelopes of a bunched beam (including linear space-charge forces) through a user-defined transport system, has undergone several upgrades in physics, coding, and capabilities. Recent modifications include centroid tracking (and misalignment capabilities) and an improved beam description that allows study of some nonlinear effects such as wakefields. The Fortran code has been made portable and runs on numerous platforms. It can be used with a variety of graphics packages. The additional beamline elements, new commands, expanded fitting capabilities, improved beam description, and coding modifications have extended TRACE 3-D's usefulness and applicability to the accelerator community. These changes are documented in the third edition of TRACE 3-D Documentation. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Rusthoi, DP (reprint author), Univ Calif Los Alamos Natl Lab, MS H 13, Los Alamos, NM 87545 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2574 EP 2576 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800835 ER PT B AU Assmann, R Adolphsen, C Bane, K Emma, P Raubenheimer, TO Siemann, R Thompson, K Zimmermann, F AF Assmann, R Adolphsen, C Bane, K Emma, P Raubenheimer, TO Siemann, R Thompson, K Zimmermann, F BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The computer program LIAR for the simulation and modeling of high performance linacs SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB High performance Linear accelerators are the central components of the proposed next generation of linear colliders. They must provide acceleration of up to 750 GeV per beam while maintaining small normalized emittances. Standard simulation programs, mainly developed for storage rings, do not meet the specific requirements for high performance linacs with high bunch charges and strong wakefields. We present the program LIAR ("LInear Accelerator Research code") that includes single and multi-bunch wakefield effects, a 6D coupled beam description, specific optimization algorithms and other advanced features. LIAR has been applied to and checked against the existing Stanford Linear Collider (SLC), the linacs of the proposed Next Linear Collider (NLC) and the proposed Linac Coherent Light Source (LCLS) at SLAG. Its modular structure allows easy extension for different purposes. The program is available for UNIX workstations and Windows PC's. A major objective of the LIAR project is to provide an open programming platform for the accelerator physics community. We invite interested scientists to join this project. The LIAR home page and the ONLINE version of the user's manual can be accessed under: http://www.slac.stanford.edu/grp/arb/rwa/liar.htm. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Assmann, R (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2580 EP 2582 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800837 ER PT B AU Cai, Y Donald, M Irwin, J Yan, YT AF Cai, Y Donald, M Irwin, J Yan, YT BE Comyn, M Craddock, MK Reiser, M Thomson, J TI LEGO: A modular accelerator design code SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An object-oriented accelerator design code has been designed and implemented in a simple and modular fashion. It contains all major features of its predecessors: TRACY and DESPOT. All physics of single-particle dynamics is implemented based on the Hamiltonian in the local frame of the component. Components can be moved arbitrarily in the three dimensional space. Several symplectic integrators are used to approximate the integration of the Hamiltonian. A differential algebra class is introduced to extract a Taylor map up to arbitrary order. Analysis of optics is done in the same way both for the linear and non-linear case. Currently, the code is used to design and simulate the lattices of the PEP-II. It will also be used for the commissioning. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Cai, Y (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2583 EP 2585 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800838 ER PT B AU Lee, M Cai, Y Corbett, J Shoaee, H Whittum, D White, G Yan, Y Zambre, Y AF Lee, M Cai, Y Corbett, J Shoaee, H Whittum, D White, G Yan, Y Zambre, Y BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Lattice commissioning strategy for the B-Factory SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB To prepare for the PEP-IZ turn on, we have studied one commissioning strategy with simulated lattice errors. Features such as difference and absolute orbit analysis and correction are discussed. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Lee, M (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 2586 EP 2588 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800839 ER PT B AU Lidia, SM Ryne, RD AF Lidia, SM Ryne, RD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Relativistic klystron two-beam accelerator simulation code development SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID INTEGRATION AB We present recent work on the development and testing of a 3-D simulation code for relativistic klystron two-beam accelerators (RK-TBAs). This code builds on our previous experience with I-D and 2 1/2-D relativistic klystron simulators. We adopt a new approach utilizing symplectic integration techniques to push particles, coupled to a circuit equation framework that advances fields in the cavities. Space charge and current effects are calculated using an electrostatic PIC algorithm. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Lidia, SM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2624 EP 2626 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800852 ER PT B AU Houck, TL Caporaso, GJ Shang, CC Sampayan, SE Molau, NE Krogh, ML AF Houck, TL Caporaso, GJ Shang, CC Sampayan, SE Molau, NE Krogh, ML BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Measured and theoretical characterization of the RF properties of stacked, high-gradient insulator material SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Recent high-voltage breakdown experiments of periodic metallic-dielectric insulating structures have suggested several interesting high-gradient applications. One such area is the employment of high-gradient insulators in high-current, electron-beam, accelerating induction modules. For this application, the understanding of the rf characteristics of the insulator plays an important role in estimating beam-cavity interactions. In this paper, we examine the rf properties of the insulator comparing simulation results with experiment. Different insulator designs are examined to determine their rf transmission properties in gap geometries. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Houck, TL (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2627 EP 2629 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800853 ER PT B AU Poole, BR Caporaso, GJ Ng, WC AF Poole, BR Caporaso, GJ Ng, WC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Wake properties of a stripline beam kicker SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The transport of a high current relativistic electron beam in a stripline beam kicker is strongly dependent on the wake properties of the structure. The effect of the beam-induced fields on the steering of the beam must be determined for a prescribed trajectory within the structure. A 3-D time domain electromagnetic code is used to determine the wake fields and the resultant Lorentz force on the beam both for an ultra-relativistic electron beam moving parallel to the beamline axis as well as a beam that follows a curved trajectory through the structure. Usually in determining the wake properties of the structure, a wake impedance is found for a beam that is moving parallel to the beamline axis. However, we extend this concept to curved trajectories by calculating beam induced forces along the curved trajectory. Comparisons are made with simple transmission line models of the structure. The wake properties are used in models to transport the beam self-consistently through the structure. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Poole, BR (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 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 0-7803-4376-X PY 1998 BP 2630 EP 2632 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800854 ER PT B AU Shang, CC Chen, YJ Caporaso, GJ Houck, TL Molau, NE Nelson, SD Ng, WC Fockler, J Gregory, S AF Shang, CC Chen, YJ Caporaso, GJ Houck, TL Molau, NE Nelson, SD Ng, WC Fockler, J Gregory, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI BBU design of linear induction accelerator cells for radiography application SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB There is an ongoing effort to develop accelerating modules for high-current electron accelerators for advanced ETA-II radiography application. Accelerating modules with low beam-cavity coupling impedances along with gap designs with acceptable field stresses comprise a set of fundamental design criteria. We examine improved cell de signs which have been developed for accelerator application in several radiographic operating regimes. We evaluate interaction impedances, analyze the effects of beam structure coupling on beam dynamics (beam break-up instability and corkscrew motion). We also provide estimates of coupling through interesting new high-gradient insulators and evaluate their potential future application in induction cells. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Shang, CC (reprint author), Univ Calif Lawrence Livermore Natl Lab, 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 0-7803-4376-X PY 1998 BP 2633 EP 2635 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800855 ER PT B AU Yan, YT Cai, Y Irwin, J AF Yan, YT Cai, Y Irwin, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A flexible-variable Truncated Power Series algebra in Zlib SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID MAPS AB Zlib is a numerical library for Truncated Power Series Algebra (TPSA) and Lie Algebra for application to nonlinear analysis of single particle dynamics. The first version was developed in 1990 with the use of the One-Step Index Pointers (OSIP's). The OSIP's form the Zlib nerve that offers optimal computation and allow order grading as well as flexible initialization of the global number of variables for the TPSA. While the OSIP's are still kept for minimum index passing to achieve efficient computation, Zlib has been being upgraded to allow flexible and gradable local number of variables in each C++ object of the Truncated Power Series (Tps) class. Possible applications using Zlib are discussed. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Yan, YT (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 2636 EP 2638 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800856 ER PT B AU Tatchyn, R AF Tatchyn, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A field-cancellation algorithm for constructing economical planar permanent magnet (PM) multipoles with large high-quality field apertures SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID DESIGN AB In recent years studies have been initiated on a new class of multipole field generators consisting of cuboid planar permanent magnet (PM) pieces arranged in biplanar arrays of 2-fold rotational symmetry. These structures, first introduced for Free Electron Laser (FEL) applications, are based on reducing the relational symmetry of conventional N-pole field generators from N-fold to 2-fold. One consequence of this reduction is a large higher-multipole content in a planar PM multipole's field at distances relatively close to the structure's axis, making it generally unsuitable for applications requiring a large high-quality field aperture. In this paper we outline an economical field-cancellation algorithm that can substantially decrease the harmonic content of a planar PM's field without breaking its biplanar geometry or 2-fold rotational symmetry. C1 Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. RP Tatchyn, R (reprint author), Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, 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 0-7803-4376-X PY 1998 BP 2639 EP 2641 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800857 ER PT B AU Xie, ZQ AF Xie, ZQ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI State of the art of ECR ion sources SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID PERFORMANCE AB Electron Cyclotron Resonance (ECR) ion source which produces highly-charged ions is used in heavy ion accelerators worldwide. Applications also found in atomic physics research and industry ion implantation. ECR ion source performance continues to improve, especially in the last few years with new techniques, such as multiple-frequency plasma heating and better methods to provide extra cold electrons, combined with higher magnetic mirror fields. So far more than 1 emA of multiply-charged ions such as He2+ and O6+, and 30 e mu A of Au32+, 1.1 e mu A of U-238(48+), and epA currents of very high charge states such as Kr-86(35+) and U-238(60+) have been produced. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Xie, ZQ (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 28 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2662 EP 2666 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800864 ER PT B AU Lee, Y AF Lee, Y BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Very-low-energy-spread ion sources SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID MULTICUSP SOURCES AB Axial ion energy spread of multicusp sources has been measured by three different techniques: an electrostatic energy analyzer for plasma ion measurement at the source exit; a magnetic deflection spectrometer; and a retarding-field energy analyzer for measurement of the accelerated beam. By introducing a magnetic filter inside the multicusp source chamber, it is shown that the energy spread of positive hydrogen ions can be reduced to approximately 1eV. The energy-spread values for H ions are lower. New ion source configurations are now being investigated to further reduce the ion energy spread to below 1 eV and maximize source performance reliability and lifetime. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Lee, Y (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 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 0-7803-4376-X PY 1998 BP 2667 EP 2671 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800865 ER PT B AU Johnson, BM Hershcovitch, A Brown, IG Liu, F Anders, A AF Johnson, BM Hershcovitch, A Brown, IG Liu, F Anders, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Results from ZMEVVA: A new source for heavy-ion accelerators SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We are developing a new approach for heavy ion beam injection (e.g., into the Relativistic Heavy Ion Collider [RHIC] at BNL). While conventional Metal Vapor Vacuum Are (MEVVA) ion sources (I.G. Brown, Rev. Sci. Instrum. 65, 3061 (1994).) can produce up to hundreds of milliamps or more of several-times-ionized metal ions (e.g., U3+), the recent results from Batalin et al. (V.A. Batalin et al. ITEP, Moscow, Reprints 18-93 (1993), 33-94 (1994); Proc. EPAC 1994, p. 1453.) indicate that the addition of an energetic electron beam (EMEVVA) may lead to considerably higher charge states (e.g., U17+). An alternative way to produce the electron beam is ZMEVVA, in which a z-discharge plasma is used to enhance multiple ionization. As the vacuum are plasma plume expands into a magnetized drift region, a z-discharge is triggered in the drifting metal plasma. The ions are then extracted and analyzed using a time-of-flight system. We report recent results using applied discharge voltages from 1 to 2 kV. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Johnson, BM (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. OI Anders, Andre/0000-0002-5313-6505 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 0-7803-4376-X PY 1998 BP 2678 EP 2680 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800868 ER PT B AU Palmer, DT Wang, XJ Miller, RH Babzien, M Ben-Zvi, I Pellegrini, C Sheehan, J Skaritka, J Winick, H Woodle, M Yakimenko, V AF Palmer, DT Wang, XJ Miller, RH Babzien, M Ben-Zvi, I Pellegrini, C Sheehan, J Skaritka, J Winick, H Woodle, M Yakimenko, V BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Emittance studies of the BNL/SLAC/UCLA 1.6 cell photocathode RF gun SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The symmetrized 1.6 cell S-band photocathode gun developed by the BNL/SLAC/UCLA collaboration is in operation at the Brookhaven Accelerator Test Facility(ATF). A novel emittance compensation solenoid magnet has also been designed, built and is in operation at the ATE These two subsystems form an emittance compensated photoinjector used for beam dynamics, advanced acceleration and free electron laser experiments at the ATE The highest acceleration field achieved on the copper cathode is 150 MV/m, and the guns normal operating held is 130 MV/m. The maximum rf pulse length is 3 mu s. The transverse emittance of the photoelectron beam were measured for various injection parameters. The 1 nC emittance results are presented along with electron bunch length measurements that indicated that at above the 400 pC, space charge bunch lengthening is occurring. The thermal emittance, epsilon(o), of the copper cathode has been measured. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Palmer, DT (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 7 TC 11 Z9 11 U1 0 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2687 EP 2689 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800871 ER PT B AU Engwall, D Bohn, C Cardman, L Dunham, B Kehne, D Legg, R Liu, H Shinn, M Sinclair, C AF Engwall, D Bohn, C Cardman, L Dunham, B Kehne, D Legg, R Liu, H Shinn, M Sinclair, C BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A high-DC-voltage GaAs photoemission gun: Transverse emittance and momentum spread measurements SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We have built a high-DC-voltage photoemission gun and a diagnostic beamline permitting us to measure rms transverse emittance (<(epsilon)over tilde>(x)) and rms momentum spread (delta) of short-duration electron pulses produced by illuminating the cathode with light from a mode-locked, frequency-doubled Nd:YLF laser. The electron gun is a GaAs photocathode source designed to operate at 500 kV. We have measured <(epsilon)over tilde>(x) and delta for conditions ranging from emittance-dominated to space-charge-dominated. We report these measurements as functions of microbunch charge for different beam radii, pulse lengths, and vortages/field gradients at the cathode, and compare them with PARMELA calculations. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Engwall, D (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 5 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2693 EP 2695 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800873 ER PT B AU Harss, B Berger, JC Borasi, F Greene, J Jiang, CL Nolen, J Pardo, RC Paul, M Rehm, KE Schiffer, JP Segel, RE Wang, TF AF Harss, B Berger, JC Borasi, F Greene, J Jiang, CL Nolen, J Pardo, RC Paul, M Rehm, KE Schiffer, JP Segel, RE Wang, TF BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The production and transport of radioactive F-17 at ATLAS for research SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A secondary beam of radioactive F-17 was produced at the ATLAS accelerator and delivered to an experimental target station with an intensity of as much as 5.10(5) Id ions/s for use in the research program. Beams of F-17 were produced via the p(O-17,F-17)n or d(O-16,F-17)n reactions by bombarding a gas-filled cell with up to 300 pnA beams of O-17 Or O-16 from the ATLAS superconducting Linac. The gas target, with HAVAR windows, was maintained at pressures as high as 500 Torr. The beam quality was dominated by small-angle scattering in the gas cell windows, by the reaction kinematics and beamline acceptance. Detailed beam parameters are presented. Plans for relocation of the target to allow improved capture efficiency and acceleration or de-acceleration of the secondary beam will also be discussed. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Harss, B (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2696 EP 2698 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800874 ER PT B AU Kang, Y Wang, J Milton, S Teng, L Thompson, K Jones, J Walters, D Jagger, J AF Kang, Y Wang, J Milton, S Teng, L Thompson, K Jones, J Walters, D Jagger, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam chopper for the low-energy undulator test line (LEUTL) in the APS SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The low-energy undulator test line (LEUTL) is being built and will be tested with a short beam pulse from an rf gun in the Advanced Photon Source (APS) at the Argonne National Laboratory. In the LEUTL a beam chopper is used after the rf gun to deflect the unwanted beam to a beam dump. The beam chopper consists of a permanent magnet and an electric deflector that can compensate for the magnetic deflection. A 30-kV pulsed power supply is used for the electric deflector. The chopper subsystem was assembled and tested for beamline installation. The electrical and beam properties of the chopper assembly are presented. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Kang, Y (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 2699 EP 2701 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800875 ER PT B AU Schlapp, M Vondrasek, RC Szczech, J Billquist, PJ Xie, ZQ Harkewicz, R Pardo, RC AF Schlapp, M Vondrasek, RC Szczech, J Billquist, PJ Xie, ZQ Harkewicz, R Pardo, RC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A new 14 GHz electron-cyclotron-resonance ion source (ECRIS) for the heavy ion accelerator facility atlas SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A new 14 GHz ECRIS has been designed and built over the last two years. The source design incorporates the latest results from ECR developments to produce intense beams of highly charged ions. An improved magnetic electron confinement is achieved from a large mirror ratio and strong hexapole field. The aluminum plasma chamber and extraction electrode as well as a biased disk on axis at the microwave injection side donate additional electrons to the plasma, making use of the large secondary electron yield from aluminum oxide. The source will be capable of ECR plasma heating using two different frequencies simultaneously to increase the electron energy gain. To be able to deliver usable intensities of the heaviest ion beams the design will also allow axial access for metal evaporation ovens and solid material. The main design goal is to produce several e mu A of at least U-238(34+) in order to accelerate the beam to coulomb-barrier energies without further stripping. First charge state distributions for O-16 and Ar-40 have been measured. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Schlapp, M (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 0-7803-4376-X PY 1998 BP 2702 EP 2704 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800876 ER PT B AU Schlapp, M Trassl, R McCullough, RW Greenwood, JB Salzborn, E AF Schlapp, M Trassl, R McCullough, RW Greenwood, JB Salzborn, E BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Characterization and recent modification of a compact 10 GHz ECRIS for atomic physics experiments and spectroscopic investigations SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID ION-SOURCE AB A compact 10 ECR ion source (200 mm long, 170 mm diameter) has been developed and tested. The complete magnetic structure made from permanent magnet material is comprised of four ring magnets producing an asymmetric axial magnetic field and a hexapole magnet with a maximum radial field of 0.94 T inside the plasma chamber. The coupling of the microwave to the plasma shows efficient ECR plasma heating at microwave power levels around 10 watts. Charge state distributions for various elements with intensities up to 320 e mu A and their dependence on operation parameters will be presented as well as VUV spectra in the wavelength region down to 15 nm. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Schlapp, M (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Greenwood, Jason/L-4799-2014 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 0-7803-4376-X PY 1998 BP 2705 EP 2707 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800877 ER PT B AU Schlapp, M Trassl, R Liehr, M Salzborn, E AF Schlapp, M Trassl, R Liehr, M Salzborn, E BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A low power low cost 2.45 GHz ECRIS for the production of multiply charged ions SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A low cost, low power ECR ion source designed for the use on a high voltage platform with limited electrical power available, has been developed. To reduce the power consumption of the source the radial and axial magnetic confinement are produced entirely by permanent magnets. An axial magnetic mirror ratio of 2.7 is obtained by a configuration of two times four block magnets. A radial magnetic field of 0.5 T inside the plasma chamber of 60 mm inner diameter is produced by a hexapole magnet. Microwave power up to 300 watts c/w can be applied to the plasma by using different slow-wave structures which allow the use of a plasma chamber much smaller in diameter than required by the wavelength of the used frequency of 2.45 GHz. The ion source can be operated in different modes either for producing multiply charged ions with intensities up to several hundred e.A or for the production of high intensity beams of singly charged ions, i.e. 6.5 mA of He+. Applications for the ion source are in crossed beams experiments and as injectors for small accelerators as well as for spectroscopic investigations in the VUV wavelength region. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Schlapp, M (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 9 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2708 EP 2710 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800878 ER PT B AU Alessi, J Beebe, E Hershcovitch, A Kponou, A Lockey, R Pikin, A Prelec, K Snydstrup, L Stein, P AF Alessi, J Beebe, E Hershcovitch, A Kponou, A Lockey, R Pikin, A Prelec, K Snydstrup, L Stein, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Progress on an EBIS for RHIC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Work is continuing on the development of an Electron Beam Ion Source (EBIS) which could be used as part of a new heavy ion injector for RHIC. On a test EBIS, we have operated with an electron beam current of up to 1.14A, and have extracted ions such as Tl41+, Xe26+, Ar14+, N7+, and Na7+. Recent experimental results are reported. In addition, we discuss plans for a new electron beam test stand that is now being built. This will allow operation with electron currents of 10 A, as well as testing of a warm-bore superconducting magnet system, methods for fast extraction of ions, and possible off-axis collection of the electron beam. C1 Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. RP Alessi, J (reprint author), Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2711 EP 2713 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800879 ER PT B AU Dudnikov, VG Stirling, WL Whealton, JH AF Dudnikov, VG Stirling, WL Whealton, JH BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Improved version of surface plasma negative ion source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The best features of two independently developed surface-plasma negative ion sources with separated function (independently controlled plasma generation and negative ion emission), have been combined in an optimized configuration; as a result, we propose to add a new mode of operation that will allow a 50-fold reduction in the negative ion temperature. The process of cesium injection developed for the semiplanotron negative ion source at the Budker Institute of Nuclear Physics (BINP), Novosibirsk [1-6], along with the hot cathode, First anode configuration and neutral gas injection of the ion source development at Oak Ridge National Laboratory (ORNL) [7-8], combines the best features of both for the continuous wave (CW) high-density, low-pressure generation of negative ions. Converter-generated cw negative ion densities of 750 mA/cm(2) are expected from the existing data base. These ions are generated with a temperature of about 7 eV; focusing these ions by a factor of 5 increases the current density to 3500 mA/cm(2) (with some mutual neutralization loss included). The ion temperature becomes 50 eV; however, according to Louville's theorem, the brightness of the beam remains at a value of 100 mA/cm(2) eV (Volume ion sources with a cw current per channel of 100 mA, have a brightness one-third this value.) The configuration of the source geometry and atomic gas control is optimized for maximum charge exchange reduction of the ion temperature by a factor of 50. The configuration involves appropriate shaping of the converter, anode slot, and hot cathode use of a supersonic gas jet of H0, and pumping the jet into the source. Increasing the beam brightness to 1000 mA/cm(2) eV corrects for a factor of four loss in recovery of charge-exchanged ions. The concept proposed here results in a net cw brightness increase of 10, which is about 30-times greater than that otherwise available. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Dudnikov, VG (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 13 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2714 EP 2716 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800880 ER PT B AU Ferdinand, R Sherman, J Stevens, RR Zaugg, T AF Ferdinand, R Sherman, J Stevens, RR Zaugg, T BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Space-charge neutralization measurement of a 75-keV, 130-mA hydrogen-ion beam SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A 75-keV, 130-mA de mode proton injector is being developed at Los Alamos. The two-solenoid focusing system used in this injector relies on effective beam space-charge (s.c.) neutralization by beam ionization of the residual gas. The degree of s.c. neutralization is determined by measurement of the energy distribution of slow ions created in the beam region. A non-interceptive gridded-energy analyzer is used for the slow ion-energy measurement. Application and development of this diagnostic to a positive hydrogen-ion beam is presented. One feature of the ion-energy distribution measurement is a double-humped distribution. The higher energy component contains less than 20% of the total ion current. Measurements are reported which help validate the axisymmetric model used here to derive the degree of beam s.c, neutralization, f. Fairly weak dependencies of f on beam current and background gas densities are found, and f is typically found to vary between f = 95 - 99% depending on the presence of the "high-energy" tail on the slow ion distribution. This degree of beam s.c. neutralization assures good transport of the hydrogen positive ion beam to the next accelerator. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM ferdinand@lns.cea.fr 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 0-7803-4376-X PY 1998 BP 2723 EP 2725 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800883 ER PT B AU Hansborough, LD Hodgkins, DJ Meyer, EA Schneider, JD Sherman, JD Stevens, RR Zaugg, TJ AF Hansborough, LD Hodgkins, DJ Meyer, EA Schneider, JD Sherman, JD Stevens, RR Zaugg, TJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Mechanical engineering of a 75-keV proton injector for the Low Energy Demonstration Accelerator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A dc injector capable of 75-keV, 110-mA proton beam operation is under development for the Low Energy Demonstration Accelerator (LEDA) project at Los Alamos. The injector uses a de microwave proton source which has demonstrated 98% beam availability while operating at design parameters. A high-voltage isolation transformer is avoided by locating all ion source power supplies and controls at ground potential. The low-energy beam transport system (LEBT) uses two solenoid focusing and two steering magnets for beam matching and centroid control at the RFQ matchpoint. This paper will discuss proton source microwave window design, H-2 gas flow control, vacuum considerations, LEBT design, and an iris for beam current control. C1 Los Alamos Natl Lab, LANSCE Div, Los Alamos, NM 87544 USA. RP Los Alamos Natl Lab, LANSCE Div, POB 1663, Los Alamos, NM 87544 USA. EM lash@lanl.gov; idschneider@lanl.gov NR 5 TC 2 Z9 2 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2740 EP 2742 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800889 ER PT B AU Pillai, C Stevens, RR Fitzgerald, DH Garnett, RW Ingalls, WB Merrill, FE Rybarcyk, LJ Sander, OR AF Pillai, C Stevens, RR Fitzgerald, DH Garnett, RW Ingalls, WB Merrill, FE Rybarcyk, LJ Sander, OR BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Performance of the LANSCE H- source and low energy beam transport at higher peak current SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Los Alamos Neutron Science Center (LANSCE) 800 MeV accelerator facility uses a multicusp-field, surface production ion source to produce H- beam for delivery to the Proton Storage Ring (PSR) and to the Weapon Neutron Research (WNR) areas. The average current delivered to the short-pulse spallation target is nominally 70 mu A. One goal of the present PSR upgrade project is to increase the average beam current to 200 mu A. This will be accomplished by a combination of increased repetition rate (from 20 Hz to 30 Hz), upgraded PSR bunchers, and a brighter H- ion source that is being designed to produce higher peak current with lower beam emittance. The present ion source and LEBT system were studied to investigate beam quality and performance at higher peak currents. Beam parameters from the ion source and in the LEBT at higher currents are comapred to those for standard operating conditions. C1 Univ Calif Los Alamos Natl Lab, LANSCE Div, Los Alamos, NM 87545 USA. RP Pillai, C (reprint author), Univ Calif Los Alamos Natl Lab, LANSCE Div, POB 1663, Los Alamos, NM 87545 USA. NR 3 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2743 EP 2745 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800890 ER PT B AU Smith, HV Sherman, JD Stevens, RR Young, LM AF Smith, HV Sherman, JD Stevens, RR Young, LM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Simulations of the LEDA LEBT H+ beam SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The computer codes TRACE and SCHAR model the Low-Energy Demonstration Accelerator (LEDA) Low-Energy Be-am Transport (LEBT) for 75-keV, 110-mA, dc HC beams. Solenoid-lens location studies verify that the proposed LEBT design gives a near-optimum match to the LEDA RFQ. The desired RFQ transmission (greater than or equal to 90%) and output emittance (less than or equal to 0.22 pi mm mad, transverse) are obtained when PARMTEQM transports the file for the SCHAR-generated optimum beam through the RFQ. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM hvsmith@lanl.gov; lyoung@lanl.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 0-7803-4376-X PY 1998 BP 2746 EP 2748 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800891 ER PT B AU Young, LM AF Young, LM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Simulations of the LEDA LEBT with H+, H-2(+), and E- particles SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The low-energy-beam transport (LEBT) system for the Low-Energy Demonstration Accelerator (LEDA) transports the beam from the ion-source plasma surface to the LEDA RFQ entrance. The code PARMELA performed these simulations of the beam transport through the LEBT. This code can simultaneously transport three particle types of different charge-to-mass ratio. Electrostatic fields, magnetic fields, and space charge influence the beam particles in this simulation. The electrostatic fields exist in the ion-source extractor. The magnetic field exists in the ion source and in the solenoid lenses. The e(-) particles, introduced into the beam of H+ and H-2(+), simulate the space charge neutralization by the residual gas in the LEBT. The H+ and H-2(+) ions leaving the source emerge from a longitudinal magnetic field, which causes the beam to rotate. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Los Alamos Natl Lab, MS H817, Los Alamos, NM 87545 USA. EM lyoung@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 0-7803-4376-X PY 1998 BP 2749 EP 2751 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800892 ER PT B AU Young, LM AF Young, LM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Simulations of the LEDA RFQ 6.7-meV accelerator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The codes PARMTEQM and RFQTRAK simulate the beam transport through the radio-frequency-quadrupole (RFQ) accelerator for the low-energy-demonstration accelerator (LEDA). They predict 95% transmission for a matched 110-mA proton beam with a normalized-rms emittance of 0.02 mm mrad. RFQTRAK simulates the effects of arbitrary vane-tip misalignments. This RFQ includes some new features in its design. It consists of four resonantly coupled 2-m-long segments that make up its 8-m length. It has higher vane-gap voltages at the high-energy end than the low-energy end. The entrance end of the RFQ has lower transverse focusing strength to facilitate beam matching. The exit of the RFQ has a transition eel and a radial-matching section. The exit radial-matching section matches the beam into the following accelerator. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Young, LM (reprint author), Univ Calif Los Alamos Natl Lab, MS H817, 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 0-7803-4376-X PY 1998 BP 2752 EP 2754 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800893 ER PT B AU Kwan, JW Chupp, WW Eylon, S AF Kwan, JW Chupp, WW Eylon, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI High current density ion sources for heavy ion fusion accelerators SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Testing of the alumino-silicate ion source and the contact ionizer at high current density was satisfactory. The dispensers embedded in the extraction electrode were capable of providing sufficient cesium vapor coverage to the ionizer thus shows a promising way of constructing an ionizer for long term heavy ion fusion applications. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Kwan, JW (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 0-7803-4376-X PY 1998 BP 2755 EP 2757 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800894 ER PT B AU Perkins, LT Celata, CM Leung, KN Pickard, DS Vilaithong, R Williams, MD AF Perkins, LT Celata, CM Leung, KN Pickard, DS Vilaithong, R Williams, MD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A compact, rf-driven, pulsed ion source for intense neutron generation SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID MULTICUSP AB Lawrence Berkeley National Laboratory is currently developing a compact, sealed-accelerator-tube neutron generator for activation analysis applications. This portable generator is projected to produce a neutron flux in the range of 10(9) to 10(10) D-T neutrons per second. A 2 MHz radio-frequency (rf)-driven ion sources, designed to fit within a similar to 5 cm diameter borehole, is used. Typical operating parameters include repetition rates up to 100 pps, with pulse widths between 10 and 80 mu s and source pressures as low as 4 mTorr. In this configuration, peak extractable hydrogen current exceeding 35 mA from a 2 mm diameter aperture, together with H-1(+) yields over 94% have been achieved. The required rf impedance matching network has been successfully miniaturized to similar to 5 cm diameter and tested. Given the low duty cycle operation, the ion source and matching do not require any cooling. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Perkins, LT (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 0-7803-4376-X PY 1998 BP 2761 EP 2763 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800896 ER PT B AU Wengrow, AB Leung, KN Leitner, MA Williams, MD Wutte, DC Ingalls, WB Stevens, RR AF Wengrow, AB Leung, KN Leitner, MA Williams, MD Wutte, DC Ingalls, WB Stevens, RR BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Development of a high duty factor, surface conversion H- ion source for the LANSCE facility SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The next generation spallation neutron sources, such as the upgrade to the Los Alamos Neutron Science Center (LANSCE) will require high intensity negative hydrogen (H-) beams. The new LANS;CE source in particular will need to generate 40 mA of H- beam current at a duty factor of 12% (1 ms pulse at 120 Hz). One option that we are currently studying concerns altering the existing LANSCE source to utilize an RF induction plasma discharge. However, before proceeding with any changes a full understanding and optimization of our current prototype ion source was required. This surface conversion source, similar to the present LANSCE source, will be used as a benchmark against which to measure future modifications, as well as to provide direction for those modifications. Results to date along with future plans will be presented. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Wengrow, AB (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 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 0-7803-4376-X PY 1998 BP 2764 EP 2766 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800897 ER PT B AU Williams, MD Leung, KN Matuk, CA Wilde, SB Benveniste, VM Graf, MA Horsky, TN Saadatmand, K AF Williams, MD Leung, KN Matuk, CA Wilde, SB Benveniste, VM Graf, MA Horsky, TN Saadatmand, K BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Development of an RF driven plasma cathode for ion sources SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Conventional tungsten cathode driven plasma sources are limited in the ability to provide large discharge currents and high discharge voltages for CW discharge plasmas. An RF driven plasma cathode based on the multicusp ion source technology has been developed at LBNL. It is shown that large electron currents at high discharge voltage can be achieved for CW discharge operation while maintaining very long cathode lifetime. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Williams, MD (reprint author), Univ Calif Berkeley, 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 0-7803-4376-X PY 1998 BP 2767 EP 2769 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800898 ER PT B AU Wutte, DC Lee, Y Leitner, MA Williams, MD Leung, KN Gough, RA Freedman, SJ Xie, ZQ Lyneis, CM AF Wutte, DC Lee, Y Leitner, MA Williams, MD Leung, KN Gough, RA Freedman, SJ Xie, ZQ Lyneis, CM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A multicusp ion source for radioactive ion beams SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In order to produce a radioactive ion beam of O-14(+), a 10 cm-diameter, 13.56 MHz radio frequency (rf) driven multicusp ion source is now being developed at Lawrence Berkeley National Laboratory. In this paper we describe the ion source performance with respect to its capability as an ion source for radioactive ion beam (RIB) production. using Ar, Xe and a 90% Ar / 10% CO gas mixture. In addition ion optic simulations for the radioactive beam line leading to the design of the ion beam extraction/transport system for the actual experimental setup will be discussed. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Wutte, DC (reprint author), Univ Calif Berkeley, 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 0-7803-4376-X PY 1998 BP 2770 EP 2772 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800899 ER PT B AU Whealton, JH Olsen, DK Raridon, RJ AF Whealton, JH Olsen, DK Raridon, RJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Toward a realistic and tractable model for negative ion extraction from volume sources SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The physics of negative ion formation is fundamentally different than that for positive ion formation. For example, with negatively biased plasma electrodes, relative to the plasma, it can be shown that the Bohm sheath stability criteria is not generally satisfied and that, in addition, the potential structure near the extraction region is a saddle point. Traditional modeling of volume negative ion sources treats them in a manner similar to positive ions with a monatomic downhill run of the negative ions from source plasma to extraction and acceleration. This method (for positive ions) consists of finding self consistent solutions to a multidimensional Poisson Equation, with the plasma electrons represented as a Boltzmann Distribution, and ions as a Vlasov Equation simulated by a suitably large number of trajectories with space charge embeddings. ideally for negative ions, one would like to model the positive and negative ions and the electrons everywhere in a Vlasov description. However, so far this is an untractable formulation since a stable convergence scheme has yet to be developed of this extremely nonlinear problem. The tractability of an alternate formulation that will be explored consists of: (1) a Vlasov treatment for the positive ions in the conventional manner, (2) a Boltzmann treatment for the electrons on the plasma side on the extraction sheath, (3) a Vlasov formulation of negative ions formed in the plasma volume, and (4) a Vlasov treatment of electrons. A self-consistent treatment of the above scheme will produce the entire potential structure in the presheath and extraction region. The Boltzmann electron component is expected to be a key ingredient in establishing a convergent scheme while at the same time modeling much of the salient and nontrivial features of the negative ion extraction from volume sources with a negatively biased plasma electrode. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Whealton, JH (reprint author), Oak Ridge Natl Lab, 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 0-7803-4376-X PY 1998 BP 2775 EP 2777 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800901 ER PT B AU Nomura, M Takahashi, H AF Nomura, M Takahashi, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Effect of the long solenoid tunnel on the growth of emittance in the PNC high power electron linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We developed a new, three-dimensional simulation code ETRA3D to calculate beam dynamics in the injector of PNC s high-power, high-duty electron linac. In ETRA3D, beam dynamics are calculated by Hamiltonian equations and the space-charge force is calculated by the potentials produced by other electrons. The Hamiltonian is calculated at each time step and the length of the time step is varied by a change in the Hamiltonian to reduce the error of transition and the calculation time. The precision of ETRA3D was checked by comparing it with the envelop equation. The agreement between them was good. We demonstrated the capabilities of ETRA3D by an example in which the electron beam is not launched along the axis of the series of the solenoid coils. Under this condition, two-dimensional codes can not calculate the beam dynamics. C1 Power Reactor & Nucl Fuel Dev Corp, Tokyo, Japan. RP Takahashi, H (reprint author), Brookhaven Natl Lab, Bldg 475B, 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 0-7803-4376-X PY 1998 BP 2787 EP 2789 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800905 ER PT B AU Srinivasan-Rao, T Ben-Zvi, I Smedley, J Wang, XJ Woodle, M Palmer, DT Miller, RH AF Srinivasan-Rao, T Ben-Zvi, I Smedley, J Wang, XJ Woodle, M Palmer, DT Miller, RH BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Performance of magnesium cathode in the S-band RF gun SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In this paper, we present the preliminary results of the performance of magnesium cathode in a high frequency RF gun. The quantum efficiency of Mg showed a dramatic improvement upon laser cleaning, increasing from 10(-5) to 4x10(-4) after two hours of cleaning, and to 2x10(-3) after systematic cleaning. The cleaning procedure for this increase is described in detail. Charge measured as a function of the laser injection phase relative to the RF phase indicates that the temporal variation of the field on the cathode both due to the RF and the shielding effect of the emitted electrons play a critical role in the emission and extraction of electrons. A model that includes this variation is numerically fitted to the measured charge and the results are presented. The unexpected outcome of the fit was the low field enhancement factor (0.1) predicted by the model for the photoemission. The physical origin of this is still under investigation. C1 Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA. RP Srinivasan-Rao, T (reprint author), Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2790 EP 2792 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800906 ER PT B AU Wang, XJ Ben-Zvi, I AF Wang, XJ Ben-Zvi, I BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Longitudinal emittance compensation in a photocathode RF gun injector SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID ELECTRON; PHOTOINJECTORS; GENERATION; DESIGN AB Electron beam bunch compression directly from photocathode RF gun injector was experimentally observed at the Brookhaven Accelerator Test Facility (ATF). The analysis is presented in this report shows that, the configuration of transverse space-charge emittance compensation photoinjecotor can also be operated in bunch length compression mode for modest amount charge (<1.0 nC), i.e., longitudinal emittance compensation. For a constant laser energy, the electron beam bunch length almost linearly decrease with the RF gun phase, and the compression ratio as large as factor of 30 was experimentally observed for a 40 pC charge. We also discuss the effect of electron beam bunching inside the RF gun on the transverse emittance, and compared with experimental results. C1 Assoc Univ Inc, Brookhaven Natl Lab, Brookhave Accelerator Test Facil, Upton, NY 11973 USA. RP Wang, XJ (reprint author), Assoc Univ Inc, Brookhaven Natl Lab, Brookhave Accelerator Test Facil, Upton, NY 11973 USA. NR 12 TC 5 Z9 5 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2793 EP 2795 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800907 ER PT B AU Carlson, RL Ridlon, RN Seitz, GJ Hughes, TP AF Carlson, RL Ridlon, RN Seitz, GJ Hughes, TP BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Multi-kiloampere, electron-beam generation from bare aluminum photo-cathodes driven by an ArF laser SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An electron-beam-pumped laser operating at ArF (193 nm) producing up to 5.0 joules in a IS0-ns pulse has been used to illuminate micro-machined aluminum cathodes. The cathode was pulsed from 2.25- up to 2.95-MV across a 20-cm-AK gap producing fields up to 145 kV/cm using REX (a 4-MeV, 5-kA, 100-ns pulsed diode). Extracted current versus laser power gives a quantum efficiency increasing with power density from 0.07 to 0.11 percent. The present work is significant in that the cathode operates in the presence of outgassing materials with a background vacuum pressure in the mid 10(-6) torr region and 100-ns-long electron beams of up to 3 kA have been produced. Both emission limited (current follows laser pulse) and space-charge-limited (current follows pulsed power) regimes have been studied up to similar to 50 A/cm(2) by varying the cathode diameter. The beam temperature has been measured to be < 5 eV and directly compared in the same experimental setup to velvet based cathodes that measure similar to 100 eV. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Carlson, RL (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 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 0-7803-4376-X PY 1998 BP 2826 EP 2828 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800918 ER PT B AU Shurter, RP Moir, DC Devlin, DJ Springer, RW Archuleta, TA AF Shurter, RP Moir, DC Devlin, DJ Springer, RW Archuleta, TA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Development and characterization of diamond film and compound metal surface high current photocathodes SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB High current photocathodes operating in vacuum environments as high as 8xE-5 torr are being developed at Los Alamos for use in a new generation of linear induction accelerators. We report quantum efficiencies in wide bandgap semiconductors, pure metals and compound metal surfaces photocathode materials illuminated by ultraviolet laser radiation. C1 Univ Calif Los Alamos Natl Lab, Dynam Expt Div, Los Alamos, NM 87545 USA. RP Shurter, RP (reprint author), Univ Calif Los Alamos Natl Lab, Dynam Expt Div, POB 1663, Los Alamos, NM 87545 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 0-7803-4376-X PY 1998 BP 2829 EP 2831 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800919 ER PT B AU Henestroza, E Yu, S Eylon, S Carlsten, B AF Henestroza, E Yu, S Eylon, S Carlsten, B BE Comyn, M Craddock, MK Reiser, M Thomson, J TI High voltage, high current, long pulse electron beam injector for DARHT SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An injector design for the long pulse option for the second axis of the Dual-Axis Radiographic Hydrotest Facility (DARHT) has been studied. This design is based on the LBNL Heavy Ion Fusion Injector technology. The proposed injector consists of a single gap diode extracting electrons from a thermionic source and powered through a high voltage ceramic insulator column by a Manx. generator. The key issues in the design are the control of beam quality to meet the DARHT 2nd axis final focus requirements, to minimize high-voltage breakdown risks, and to fit the injector structure within the available space. We will present the injector conceptual design as well as beam dynamics simulations in the diode and in the injector-main-accelerator interface. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Henestroza, E (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 3 TC 0 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2832 EP 2834 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800920 ER PT B AU Hernandez, M Fisher, A Meyerhofer, D Miller, R Palmer, DT Park, S Reis, D Schmerge, J Weaver, J Wiedemann, H Winick, H Yeremian, D AF Hernandez, M Fisher, A Meyerhofer, D Miller, R Palmer, DT Park, S Reis, D Schmerge, J Weaver, J Wiedemann, H Winick, H Yeremian, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Emittance measurements for the SLAC gun test facility SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The requirement of a high brightness electron source linac phasing and possibly a streak camera. Another for the proposed Linac Coherent Light Source (LCLS) toroid enables measurement of the beam current. The project at SLACE[1] has led to the development of the Gun beam is then passed through a 60 degrees bend magnet for Test Facility (GTF). The facility consists of a energy analysis using a screen and finally the beam will photocathode RF gun, emittance compensation solenoid, a single 3-meter SLAC S-band linac section, a single XK-5 klystron, low and high energy diagnostic sections and a cathode drive laser. In this paper, the specifications of the desired electron beam will be discussed along with results of PARMELA simulations to determine the optimum laser pulse shape for minimum beam emittance. The diagnostics of the GTF will be discussed and measurements will be presented which were made at the SUNSHINE Facility at Stanford to develop the instrumentation to be used at the Gun Test Facility once it is operational. Future beam diagnostics will also be discussed. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Hernandez, M (reprint author), Stanford Linear Accelerator Ctr, POB 4349,MS 69, Stanford, CA 94309 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2840 EP 2842 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800923 ER PT B AU Palmer, DT Wang, XJ Ben-Zvi, I Miller, RH Skaritka, J AF Palmer, DT Wang, XJ Ben-Zvi, I Miller, RH Skaritka, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Experimental results of a single emittance compensation solenoidal magnet SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID ALAMOS AB A new iron dominated single emittance compensation solenoidal magnet was designed to be integrated with the BML/SLAC/UCLA 1.6 cell S-Band Photocathode rf Gun. This emittance compensated photoinjector is now in operation at the Brookhaven Accelerator Test Facility. It has produced a 0.329 +/- 0.012 pC, tau(95%) = 10.9 psec electron bunches with a normalized rms transverse emittance of epsilon(n,rms) = 1.17 +/- 0.16 pi mm mrad. POISSON field maps were used with PARMELA to optimize the emittance compensation solenoidal magnet design. Magnetic field measurements show that at the cathode plane B-z less than or equal to 10 G for a peak magnetic field of B-z,B-max = 3 kG. Which is in agreement with POISSON simulation. A single emittance compensation solenoidal magnet will produces a initial angular momentum of the electron bunch that manifests itself in a initial magnetic emittance term that cannot be eliminated. This magnetic emittance epsilon(n,rms)(mag) scales as 0.010 pi mm mrad/G at the cathode, which is in agreement with PARMELA simulations. Experimental beam dynamics results are presented that shows relative angular rotation and spot size as a function of cathode magnetic field. These results are compared to theory. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Palmer, DT (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 10 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2843 EP 2845 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800924 ER PT B AU Palmer, DT Wang, XJ Ben-Zvi, I Miller, RH AF Palmer, DT Wang, XJ Ben-Zvi, I Miller, RH BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam dynamics enhancement due to accelerating field symmetrization in the BNL/SLAC/UCLA 1.6 cell S-band photocathode RF gun SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID ALAMOS AB A 1.6 cell photocathode S-Band gun developed by the BNL/SLAC/UCLA collaboration is now in operation at the Brookhaven Accelerator Test Facility (ATF). One of the main features of this RF gun is the symmetrization of the RF coupling iris with a identical vacuum pumping port located in the full cell. The effects of the asymmetry caused by the RF coupling iris were experimentally investigated by positioning a metallic plunger at the back wall of the vacuum port iris. The higher order modes produced were studied using electron beamlets with g-fold symmetry. The 8-fold beamlets were produced by masking the laser beam. These experimental results indicate that the integrated electrical center and the geometrical center of the gun are within 175 mu m. Which is within the laser alignment tolerance of 250 mu m. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Palmer, DT (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2846 EP 2848 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800925 ER PT B AU Tang, H Alley, RK Clendenin, JE Fisher, AS Kotseroglou, T Miller, RH Mulhollan, GA Palmer, DT Yeremian, AD AF Tang, H Alley, RK Clendenin, JE Fisher, AS Kotseroglou, T Miller, RH Mulhollan, GA Palmer, DT Yeremian, AD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Polarized electron sources for future e(+)/e(-) linear colliders SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID CHARGE LIMIT; PHOTOCATHODES AB Polarized electron beams will play a crucial role in maximizing the physics potential for future e(+)/e(-) linear colliders. We will review the SLC polarized electron source (PES), present a design for a conventional PES for the Next Linear Collider (NLC), and discuss the physics issues of a polarized RF gun. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Tang, H (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 2849 EP 2851 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800926 ER PT B AU Yeremian, AD Adolphsen, C Miller, RH Nantista, CD Wang, JW AF Yeremian, AD Adolphsen, C Miller, RH Nantista, CD Wang, JW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI NLCTA injector experimental results SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The purpose of the Next Linear Collider Test Accelerator (NLCTA) at SLAG is to integrate the new technologies of X-band accelerator structures and RF systems for the Next Linear Collider (NLC), demonstrate multibunch beam-loading energy compensation and suppression of higher-order deflecting modes, measure the transverse components of the accelerating field, and measure the dark current generated by RF field emission in the accelerator [1]. For beam loading R&D, an avenge current of about 1 A in a 120 ns long bunch train is required. The initial commissioning of the NLCTA injector, as well as the rest of the accelerator have been progressing very well. The initial beam parameters are very close to the requirement and we expect that injector will meet the specified requirements by the end of this summer. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Yeremian, AD (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2852 EP 2854 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800927 ER PT B AU Yeremian, AD Bharadwaj, VK Emma, P Miller, RH Palmer, DT Woodley, MD AF Yeremian, AD Bharadwaj, VK Emma, P Miller, RH Palmer, DT Woodley, MD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A proposed injector for the LCLS linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Linac Coherent Light Source (LCLS) will use the last portion of the SLAG accelerator as a driver for a short wavelength FEL. The injector must produce 1-nC, 3-ps rms electron bunches at a repetition rate of up to 120 Hz with a normalized rms emittance of about 1 mm-mrad. The injector design takes advantage of the photocathode rf gun technology developed since its conception in the mid 1980's [I], in particular the S-band rf gun developed by the SLAC/BNL/UCLA collaboration [2], and emittance compensation techniques developed in the last decade [3,4]. The injector beamline has been designed using the SUPERFISH, POISSON, PARMELA, and TRANSPORT codes in a consistent way to simulate the beam from the gun up to the entrance of the main accelerator linac where the beam energy is 150 MeV. PARMELA simulations indicate that at 150 MeV, space charge effects are negligible. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Yeremian, AD (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 0-7803-4376-X PY 1998 BP 2855 EP 2857 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800928 ER PT B AU Sinclair, CK Poelker, BM Price, JS AF Sinclair, CK Poelker, BM Price, JS BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Atomic hydrogen cleaning of semiconductor photocathodes SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID MOLECULAR-BEAM EPITAXY AB Negative Electron Affinity (NEA) semiconductor photocathodes are widely used for the production of polarized electron beams, and are also useful for the production of high brightness electron beams which can be modulated at very high frequencies. Preparation of an atomically clean semiconductor surface is an essential step in the fabrication of a NEA photocathode. This cleaning step is difficult for certain semiconductors, such as the very thin materials which produce the highest beam polarization, and those which have tightly bound oxides and carbides. Using a small RF dissociation atomic hydrogen source, we have reproducibly cleaned GaAs wafers which have been only degreased Frier to installation in vacuum. We have consistently prepared very high quantum efficiency photocathodes following atomic hydrogen cleaning. Details of our apparatus and most recent results are presented. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Sinclair, CK (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2864 EP 2866 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800931 ER PT B AU Rees, D AF Rees, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design of 250-MW CW RF system for APT SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The design for the RF systems for the APT (Accelerator Production of Tritium) proton linac will be presented. The linac produces a continuous beam power of 130 MW at 1300 MeV with the installed capability to produce up to a 170 MW beam at 1700 MeV. The linac is comprised of a 350 MHz RFQ to 7 MeV followed in sequence by a 700 MHz coupled-cavity drift tube linac, coupled-cavity linac, and superconducting (SC) linac to 1700 MeV. At the 1700 MeV, 100 mA level the linac requires 213 MW of continuous-wave (CW) RF power. This power will be supplied by klystrons with a nominal output power of 1.0 MW. 237 klystrons are required with all but three of these klystrons operating at 700 MHz. The klystron count includes redundancy provisions that will be described which allow the RF systems to meet an operational availability in excess of 95 percent. The approach to achieve this redundancy will be presented for both the normal conducting (NC) and SC accelerators. Because of the large amount of CW RF power required for the APT linac, efficiency is very important to minimize operating cost. Operation and the RF system design, including in-progress advanced technology developments which improve efficiency, will be discussed. RF system performance will also be predicted. Because of the simultaneous pressures to increase RF system reliability, reduce tunnel envelope, and minimize RF system cost, the design of the RF vacuum windows has become an important issue. The power from a klystron will be divided into four equal parts to minimize the stress on the RF vacuum windows. Even with this reduction, the RF power level at the window is at the upper boundary of the power levels employed at other CW accelerator facilities. The design of a 350 MHz, coaxial vacuum window will be presented as well as test results and high power conditioning profiles. The transmission of 950 kW, CW, power through this window has been demonstrated with only minimal high power conditioning. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Rees, D (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2889 EP 2893 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800938 ER PT B AU Caryotakis, G AF Caryotakis, G BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Development of X-band klystron technology at SLAC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The SLAG design for a 1-TeV collider (NLC) requires klystrons with a performance which is well beyond the state-of-the-art for microwave tubes in the United States or abroad. The electrical specifications for the NLC klystrons are not fully established, but they are approximately as follows: [GRAPHICS] SLAC is in the seventh year of a program to develop these klystrons. The choice of X-band as the operating frequency, along with the sheer size of the NLC, have resulted in some new, most demanding standards for the klystrons which may power this future machine. These are related to the overall efficiency required, to the high rf gradients that must be supported at the output circuit without vacuum breakdown, and to the manufacturing cost of the 5,000-10,000 klystrons needed for the collider. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Caryotakis, G (reprint author), Stanford Linear Accelerator Ctr, POB 4349, Stanford, CA 94309 USA. 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 0-7803-4376-X PY 1998 BP 2894 EP 2898 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800939 ER PT B AU Shu, QS Neuffer, D Simrock, S AF Shu, QS Neuffer, D Simrock, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design of three recirculating-linac SRF systems for a 4-TeV mu(+)-mu(-) collider SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In a conceptual design of the accelerating systems for a 4TeV mu(+)-mu(-) collider, three recirculating superconducting linacs (with energies reaching 70 GeV (with 350 MHz SRF), 250 GeV (800 MHz) and 2000 GeV (1300 GHz), respectively) are used. We briefly describe design concepts for the acceleration features, superconducting RF cavities, input couplers, RF control and the RF power systems. C1 Northrop Grumman Co, Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Shu, QS (reprint author), Northrop Grumman Co, Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2905 EP 2907 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800942 ER PT B AU Krawczyk, FL Gentzlinger, RC Haynes, B AF Krawczyk, FL Gentzlinger, RC Haynes, B BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Superconducting cavities for the APT accelerator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The design of an Accelerator Production of Tritium (APT) facility being investigated at Los Alamos includes a linear accelerator using superconducting rf-cavities for the acceleration of a high-current cw proton beam. For electron accelerators with particles moving at the speed of light (beta approximate to 1.0), resonators with a rounded shape, consisting of ellipsoidal and cylindrical sections, are well established. They are referred to as "elliptical" cavities. For the APT-design, this shape has been adapted for much slower proton beams with beta ranging from 0.60 to 0.94. This is a new energy range, in which resonators of an elliptical type have never been used before. Simulations with the well-proven electromagnetic modeling tools MAFIA and SUPERFISH were performed. The structures have been optimized for their rf and mechanical properties as well as for beam dynamics requirements. The TRAK_RF simulation code is used to investigate potential multipacting in these structures. All the simulations will be put to a final test in experiments performed on single cell cavities that have started in our structures laboratory. C1 Univ Calif Los Alamos Natl Lab, Los Alamos Neutron Scattering Ctr 1, Los Alamos, NM 87545 USA. RP Krawczyk, FL (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos Neutron Scattering Ctr 1, MS H817, 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 0-7803-4376-X PY 1998 BP 2914 EP 2916 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800945 ER PT B AU Horan, D Lenkszus, F Laird, R AF Horan, D Lenkszus, F Laird, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A divide-down rf source generation system for the advanced photon source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A divide-down rf source system has been designed and built at Argonne National Laboratory to provide harmonically-related and phase-locked rf source signals between the APS 352-MHz storage ring and booster synchrotron rf systems and the 9.77-MHz and 117-MHz positron accumulator ring rf systems. The design provides rapid switching capability back to individual rf synthesizers for each one. The system also contains a digital bucket phase shifter for injection bucket selection. Input 352-MHz rf from a master synthesizer is supplied to a VXI-based ECL divider board which produces 117-MHz and 9.77-MHz square-wave outputs. These outputs are passed through low-pass filters to produce pure signals at the required fundamental frequencies. These signals, plus signals at the same frequencies from independent synthesizers, are fed to an interface chassis where source selection is made via local/remote control of coaxial relays. This chassis also produces buffered outputs at each frequency for monitoring and synchronization of ancillary equipment. 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. 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 0-7803-4376-X PY 1998 BP 2926 EP 2928 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800949 ER PT B AU Jones, J Bromberek, D Kang, Y Kustom, R Morrison, L Piech, R Rotela, E Sharma, S Sheng, IC AF Jones, J Bromberek, D Kang, Y Kustom, R Morrison, L Piech, R Rotela, E Sharma, S Sheng, IC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Mechanical design upgrade of the APS storage ring rf cavity tuner SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Advanced Photon Source (APS) storage ring (SR) rf system employs four banks of four spherical, single-cell resonant cavities. Each cavity is tuned by varying the cavity volume through insertion/retraction of a copper piston located at the circumference of the cavity and oriented perpendicular to the accelerator beam. During the commissioning of the APS SR, the tuners and cavity tuner ports were prone to extensive arcing and overheating. The existing tuners were modified to eliminate the problems, and two new, redesigned tuners were installed. In both cases marked improvements were obtained in the tuner mechanical performance. As measured by tuner piston and flange surface temperatures, tuner heating has been reduced by a factor of five in the new version. Redesign considerations discussed include tuner piston-to-housing alignment, tuner piston and housing materials and cooling configurations, and tuner piston sliding electrical contacts. The tuner redesign is also distinguished by a modular, more maintainable assembly. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Jones, J (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 2929 EP 2931 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800950 ER PT B AU Kang, YW Jiang, X AF Kang, YW Jiang, X BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Coaxial higher-order mode damper employing a high-pass filter SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Two different types of coaxial higher-order mode (HOM) dampers have been investigated for the Advanced photon Source (APS) storage ring cavities: e-probe dampers and h-loop dampers. Realization of the h-loop dampers has been difficult because the loop antenna couples not only to the HOMs but also to the accelerating mode and results in loss of Q at the fundamental frequency. Previously, a first-order fundamental rejection filter was tested with unsatisfactory rejection characteristics. This problem can be overcome by using a higher-order high-pass filter between the loop and the matched load. Prototype dampers have been fabricated and tested in a storage ring single-cerl cavity and the damping characteristic was analyzed. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Kang, YW (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 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2932 EP 2934 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800951 ER PT B AU Kang, YW Horan, D AF Kang, YW Horan, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Reconfigurable high-power rf system in the APS SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The 352-MHz high-power system for the Advanced Photon Source (APS) storage ring and booster synchrotron has been configured to allow two to four klystrons to power the storage ring and one klystron to power the booster. A quadrature hybrid combines two klystron outputs with two 45 degrees phase shifters at each output of the hybrid for proper phasing at the storage ring cavities for the selected mode. The phase shifters in the hybrid outputs and three waveguide switches are used to choose an operation mode in any one of twelve possible configurations using three to five klystrons to power the storage ring and booster. The system can be configured to use one klystron as the power source of a test station. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Kang, YW (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2935 EP 2937 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800952 ER PT B AU Kang, YW Jiang, X Mangra, D Smith, T AF Kang, YW Jiang, X Mangra, D Smith, T BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Upgraded cavities for the positron accumulator ring of the APS SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Upgraded versions of cavities for the APS positron accumulator ring (PAR) have been built and are being tested. Two cavities are in the PAR: a fundamental 9.8 MHz cavity and a twelfth harmonic 117.3-MHz cavity. Both cavities have been manufactured for higher voltage operation with improved Q-factors, reliability, and tuning capability. Both cavities employ current-controlled ferrite tuners for control of the resonant frequency. The harmonic cavity can be operated in either a pulsed mode or a CW mode. The rf properties of the cavities are presented. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Kang, YW (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 2938 EP 2940 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800953 ER PT B AU Nassiri, A Cours, A Grelick, A Horan, D Kang, YW Kustom, RL Smith, TL Song, J AF Nassiri, A Cours, A Grelick, A Horan, D Kang, YW Kustom, RL Smith, TL Song, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An overview of the APS 352-MHz RF systems SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Advanced Photon Source (APS) is a 7-GeV full energy positron storage ring for generating synchrotron radiation with an injector. The booster synchrotron rf system consists of a single 1-MW klystron which drives four five-cell cavities at 352 MHz. The storage ring cavities consist of four groups of four single cells powered by two 1-MW klystrons for 100-mA operation. An overview of the operation of the APS 352-MHz rf systems is presented. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Nassiri, A (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 2941 EP 2943 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800954 ER PT B AU Song, JJ Harkay, KC Kang, YW Kustom, RL Nassiri, A AF Song, JJ Harkay, KC Kang, YW Kustom, RL Nassiri, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Higher-order modes of storage ring RF cavities and their interaction with the beam at the advanced photon source (aps) SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The higher-order modes (HOMs) of APS storage ring (SR) rf cavities and waveguides were measured under various operating conditions. The HOMs of the 352-MHz rf cavity can be one of the major contributors to the coupled bunch (CB) instability. The distribution of HOMs under various conditions of beam current, cavity temperature, cavity tuning, single-bunch and multi-bunch operation, and fill patterns, are presented. The HOMs' shunt impedance of the loaded cavities were also measured. The effect of stagger tuning of the 16 cavities and their waveguide system is compared, and the HOM dampers are examined. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Song, JJ (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 2 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 2944 EP 2946 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800955 ER PT B AU Connolly, R Aspenleiter, J Kwiatkowski, S AF Connolly, R Aspenleiter, J Kwiatkowski, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Modifying CERN SPS cavities and amplifiers for use in RHIC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A system of ten rf cavities operating at 197 MHz will provide longitudinal focusing during beam storage in the Relativistic Heavy Ion Collider (RHIC). The cavities and tetrode amplifiers are from CERN where they had been used in the Super Proton Synchrotron to accelerate leptons for injection into LEP. The amplifier-cavity system had an impedance pole about 3 MHz below cavity resonance which was a possible source of oscillation with rf feedback. This was not a problem at CERN because the cavities were operated without feedback. The impedance pole was moved lower in frequency by extending the length of the drive line. When this was done it was no longer possible to tune the amplifier to give a good match to the drive loop resulting in about 50% anode efficiency. In the class of operation we are using, an efficiency of 65%-70% is expected. A good match was achieved by increasing the loop coupling from 16 Omega to 19 Omega. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Connolly, R (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 0-7803-4376-X PY 1998 BP 2947 EP 2949 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800956 ER PT B AU Goldberg, DA Rimmer, RA AF Goldberg, DA Rimmer, RA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Measurement and identification of HOM's in RF cavities SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB One of the major sources of beam impedance in accelerators is the higher-order modes (HOM's) of the RF cavities. We report here on a number of techniques for the identification of MOM's and measurement of their properties. Central to these techniques is the application of symmetry principles and the effects of symmetry-breaking perturbations (including mode-mixing) to the "standard" techniques of spectrum measurements and bead pulls. A fuller report is being prepared for publication[1]. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Goldberg, DA (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd, 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 0-7803-4376-X PY 1998 BP 3001 EP 3003 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800974 ER PT B AU Rimmer, RA Allen, MA Fant, K Hill, A Hoyt, M Judkins, J Neubauer, M Schwarz, HD AF Rimmer, RA Allen, MA Fant, K Hill, A Hoyt, M Judkins, J Neubauer, M Schwarz, HD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI High-power testing of RF cavities for the PEP-II B factory SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We describe the process of conditioning and high-power testing of RF cavities for PEP-II. Procedures for vacuum assembly, bakeout and automated processing are described. Interlocks and safety precautions for protection of equipment and personnel are discussed and performance data of tested cavity assemblies are reported. Performance of ancillary components such as windows, couplers and tuners is also discussed. Comments are included on handling, alignment, installation and commissioning issues where appropriate. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Rimmer, RA (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd, 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 0-7803-4376-X PY 1998 BP 3004 EP 3006 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800975 ER PT B AU Franks, RM Rimmer, RA Schwarz, H AF Franks, RM Rimmer, RA Schwarz, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Fabrication processes for the PEP-II RF cavities SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper presents the major steps used in the fabrication of the 26 RF Cavities required for the PEP-II. B-factory. Several unique applications of conventional processes have been developed and successfully implemented: electron beam welding (EBW), with minimal porosity, of .75 inch (19 mm) copper cross-sections; extensive 5-axis milling of water channels; electroplating of .37 inch (10 mm) thick OFE copper; tuning of the cavity by profiling beam noses prior to final joining with the cavity body; and machining of the cavity interior, are described here. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Franks, RM (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 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 0-7803-4376-X PY 1998 BP 3007 EP 3009 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800976 ER PT B AU Akre, R Decker, FJ Jobe, RK Koontz, R Mitchell, M Strozinsky, R AF Akre, R Decker, FJ Jobe, RK Koontz, R Mitchell, M Strozinsky, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI SLC interferometer system and phase distribution upgrades SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Many of the components used in the Stanford Linear Collider (SLC) phasing system date back 30 years to the construction of SLAG. At the start of SLC the phase reference system was upgraded with many of the original components remaining. The R.F. drive system phase stability requirements became tighter with operation and optimization of the SLC. This paper describes analysis done on the R.F. drive system and interferometer system during the 1996 run and down time, modifications to the systems during the 1996-97 down time, and the improvements in stability from the modifications. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94305 USA. RP Akre, R (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 0-7803-4376-X PY 1998 BP 3021 EP 3023 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800981 ER PT B AU Akre, R Barillas, G Mitchell, M AF Akre, R Barillas, G Mitchell, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Calibration system for SLC 476MHz to 2856MHz multipliers SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The two mile long Main Drive Line (MDL) distributes 476MHz at each of the 31 sectors along its length. Each of the 31 sectors has a six times multiplier which drives the 2856MHz phase reference system for that sector. This system is used to set and maintain phase of the accelerator structures over time. During previous runs significant down time resulted from sector phasing which was required after multiplier replacement. A system was designed to calibrate the phase of the 476MHz input to the phase of the 2856MHz output of the multiplier units. This enabled multipliers to be replaced without rephasing sectors. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Akre, R (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3024 EP 3026 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800982 ER PT B AU Holmes, S Ziomek, C Adolphsen, C Akre, R Allison, S Clark, S Dean, T Fuller, RW Gold, S Jobe, RK Koontz, R Lavine, TL Nantista, C Wilson, Z Young, A AF Holmes, S Ziomek, C Adolphsen, C Akre, R Allison, S Clark, S Dean, T Fuller, RW Gold, S Jobe, RK Koontz, R Lavine, TL Nantista, C Wilson, Z Young, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Low-level RF signal processing for the next linear collider test accelerator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In the X-band accelerator system for the Next Linear Collider Test Accelerator (NLCTA), the Low Level RF (LLRF) drive system must be very phase stable, but concurrently, be very phase agile. Phase agility is needed to make the Stanford Linear Energy Doubler (SLED) power multiplier systems work and to shape the RF waveforms to compensate beam loading in the accelerator sections. Similarly, precision fast phase and amplitude monitors are required to view, track, and feed back on RF signals at various locations throughout the system. The LLRF is composed of several subsystems: the RF Reference System generates and distributes a reference 11.424GHz signal to all of the RF stations, the Signal Processing Chassis creates the RF waveforms with the appropriate phase modulation, and the Phase Detector Assembly measures the amplitude and phase of monitored RF signals. The LLRF is run via VXI instrumentation. These instruments are controlled using HP VEE graphical programming software. Programs have been developed to shape the RF waveform, calibrate the phase modulators and demodulators, and display the measured waveforms. This paper describes these and other components of the LLRF system. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Holmes, S (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3027 EP 3029 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800983 ER PT B AU Krejcik, P AF Krejcik, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Waveguide stub-line tuning of RF cavities with heavy beam loading SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A method is proposed for using adjustable, waveguide stub-line tuners to match the load impedance of the cavity plus beam to the power source, without the need to detune the cavity. Adjustable stub-line tuners are shown to be able to completely match the resistive and reactive parts of the load impedance to a generator under all conditions of beam loading, ensuring optimum power transfer between generator and cavity. This technique may have advantages in high-current storage rings such as the SLC damping rings and the new PEP II storage rings. The coupled-bunch instability driven by the fundamental mode of the cavity is re-appraised in this coupling scheme in which the cavity is no longer detuned. The consequences of this matching scheme are also considered for the beam loading stability limit. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Krejcik, P (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3030 EP 3032 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800984 ER PT B AU Lin, XE Ng, CK Ko, K AF Lin, XE Ng, CK Ko, K BE Comyn, M Craddock, MK Reiser, M Thomson, J TI HOM power propagation and attenuation in PEP-II B-factory SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Most of the higher-order-mode (HOM) power that propagates in the PEP-II rings is generated in the RF cavities but its content in terms of TE and TM components has not been accurately determined. For purpose of shielding beamline components such as bellows and BPMs from TE power penetration and determining the heating on the cavity HOM absorber, this HOM power content and its distribution profile around the rings are needed. This paper calculates the TE and TM contributions of the RF cavities to the circulating HOM power and their transmission properties at another cavity downstream. By considering both the generation in, and scattering by the cavities, as well as the attenuation along the vacuum chamber, a complete distribution profile for the TE and TM HOM power can be obtained. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Lin, XE (reprint author), Stanford Univ, 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 0-7803-4376-X PY 1998 BP 3033 EP 3035 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800985 ER PT B AU Pritzkau, DP Menegat, A Siemann, RH Lee, TG Yu, DUL AF Pritzkau, DP Menegat, A Siemann, RH Lee, TG Yu, DUL BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Experimental study of pulsed heating of electromagnetic cavities SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An experiment to study the effects of pulsed heating in electromagnetic cavities will be performed. Pulsed heating is believed to be the limiting mechanism of high acceleration gradients at short wavelengths. A cylindrical cavity operated in the TE011 mode at a frequency of 11.424 GHz will be used. A klystron will he used to supply a peak input power of 20 MW with a pulse length of 1.5 mu s. The temperature response of the cavity will be measured by a second waveguide designed to excite a TE012 mode in the cavity with a low-power CW signal at a frequency of 17.8 GHz. The relevant theory of pulsed heating will be discussed and the results from cold-testing the structure will be presented. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Pritzkau, DP (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3036 EP 3038 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800986 ER PT B AU Schwarz, HD Fant, K Judkins, JG Neubauer, M Rimmer, RA AF Schwarz, HD Fant, K Judkins, JG Neubauer, M Rimmer, RA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Development of a movable plunger tuner for the high-power RF cavity for the PEP-II B factory SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A 10 cm diameter by 5 cm travel plunger tuner was developed for the PEP-II RF copper cavity system. The single cell cavity including the tuner is designed to operate up to 150 kW of dissipated RF power. Spring finger contacts to protect the bellows from RF power are specially placed 8.5 cm away from the inside wall of the cavity to avoid fundamental and higher order mode resonances. The spring fingers are made of dispersion-strengthened copper to accommodate relatively high heating. The design, alignment, testing and performance of the tuner is described. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Schwarz, HD (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3039 EP 3041 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800987 ER PT B AU Wang, JW Adolphsen, C Atkinson, R Baumgartner, W Eichner, J Fuller, RW Gold, SL Hanna, SM Holmes, SG Koontz, RF Lavine, TL Loewen, RJ Miller, RH Nantista, CD Pope, R Rifkin, J Ruth, RD Tantawi, SG Vlieks, AE Wilson, PB Wilson, Z Yeremian, A AF Wang, JW Adolphsen, C Atkinson, R Baumgartner, W Eichner, J Fuller, RW Gold, SL Hanna, SM Holmes, SG Koontz, RF Lavine, TL Loewen, RJ Miller, RH Nantista, CD Pope, R Rifkin, J Ruth, RD Tantawi, SG Vlieks, AE Wilson, PB Wilson, Z Yeremian, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI RF systems for the NLCTA SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper describes an X-Band RF system for the Next Linear Collider Test Accelerator.[1] The RF system consists of a 90 MeV injector and a 540 MeV linac. The main components of the injector are two low-Q single-cavity prebunchers and two 0.9-m-long detuned accelerator sections. The linac system consists of six 1.8-m-long detuned and damped detuned accelerator sections powered in pairs. The rf power generation, compression, delivery, distribution and measurement systems consist of klystrons, SLED-II energy compression systems, rectangular waveguides, magic-T's, and directional couplers. The phase and amplitude for each prebuncher is adjusted via a magic-T type phase shifter/attenuator. Correct phasing between the two 0.9 m accelerator sections is obtained by properly aligning the sections and adjusting two squeeze type phase shifters. Bunch phase and bunch length can be monitored with special microwave cavities and measurement systems. The design, fabrication, microwave measurement, calibration, and operation of the sub-systems and their components are briefly presented. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Wang, JW (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 3042 EP 3044 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800988 ER PT B AU Xu, X Callin, RS Fowkes, WR Menegat, A Scheitrum, GP Whittum, DH AF Xu, X Callin, RS Fowkes, WR Menegat, A Scheitrum, GP Whittum, DH BE Comyn, M Craddock, MK Reiser, M Thomson, J TI RF breakdown studies in X-Band klystron cavities SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB RF breakdown studies are presently being carried out at SLAG with klystron cavities in a traveling wave resonator (TWR). Different kinds of fabrication methods and several kinds of semiconducting and insulating coatings have been applied to X-Band TM010 cavities. RF breakdown thresholds up to 250 MV/m have been obtained. Dark current levels were found to be depressed in TiN-coated and single-point diamond turned cavities. A new TM020 cavity with demountable electrodes has been designed and will be used to test a variety of materials, coatings, and processes. Recent tests of klystron output windows at 119 MW are also presented in this paper. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Xu, X (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 3045 EP 3047 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800989 ER PT B AU Shepard, KW Roy, A Potukuchi, PN AF Shepard, KW Roy, A Potukuchi, PN BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Niobium quarter-wave cavity for the New Delhi booster linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper reports the completion of development of a 97 MHz niobium coaxial quarter-wave cavity to be used in a booster linac for the New Delhi 16UD pellatron electrostatic accelerator. A prototype cavity, which incorporates a niobium-bellows tuning device, has been completed and operated at 4.2 K at accelerating gradients above 3 MV/m for extended periods of time. 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 0-7803-4376-X PY 1998 BP 3072 EP 3074 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800998 ER PT B AU Krawczyk, FL AF Krawczyk, FL BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Higher order mode analysis of the APT superconducting cavities SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In another contribution to this conference [1] the design of superconducting cavities for low velocity proton beams will be reported. Besides an optimization of the rf properties of the accelerating pi-mode, other modes, possibly excited by the traversing proton beam, need to be regarded. The full spectrum of modes in beta = 0.64 and beta = 0.82 5- cell cavities, as proposed for the Accelerator Production of Tritium (APT) facility [4], has been calculated up to frequencies higher than 2.0 GHz. These have been evaluated for their potential to affect the beam. The presence of "trapped" modes has also been investigated. In addition to the specific mode spectrum, the total power deposited into the cavities by the beam has been determined from the induced wake-fields. Due to the operation with beams below the velocity of light, extreme care was required to prevent incorrect results by wave reflections from the boundaries of the calculation volume. The simulations indicate that a power deposition of up to 17 W per cavity can be expected in the worst case. This power might have to be removed by higher order mode couplers, which is a technically feasible task. Transporting this power out to a room temperature dump does not even noticeably increase the requirements to the cryogenic system. Also for the prevention of beam break-up effects and for suppression of resonant excitation of specific higher order modes (HOMs) it is of interest to investigate the removal of this MOM-power. Different approaches to implement this removal technically are entertained. C1 Univ Calif Los Alamos Natl Lab, LANSCE, Los Alamos, NM 87545 USA. RP Krawczyk, FL (reprint author), Univ Calif Los Alamos Natl Lab, LANSCE, MS H817, Los Alamos, NM 87545 USA. NR 4 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3093 EP 3095 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801005 ER PT B AU Rusnak, B Haynes, WB Chan, KCD Gentzlinger, RB Kidman, R King, NSP Lujan, RE Maloney, M Ney, S Shapiro, AH Ullmann, J AF Rusnak, B Haynes, WB Chan, KCD Gentzlinger, RB Kidman, R King, NSP Lujan, RE Maloney, M Ney, S Shapiro, AH Ullmann, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI In-situ proton irradiation and measurement of superconducting RF cavities under cryogenic conditions SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Accelerator Production of Tritium (APT) Project is investigating using a superconducting linac for the high-energy portion of the accelerator. As this accelerator would be used to accelerate a high-current (100-mA) CW proton beam up to 1700 MeV, it is important to determine the effects of stray-beam impingement on the superconducting properties of 700-MHz niobium cavities. To accomplish this, two 3000-MHz elliptical niobium cavities were placed in a cryostat, cooled to nominally 2 K in sub-atmospheric liquid helium, and irradiated with 798-MeV protons at up to 490-nA average current. The elliptically shaped beam passed through the equatorial regions of both cavities in order to maximize sensitivity to any changes in the superconducting surface resistance. Over the course of the experiment, 6x10(16) protons were passed through the cavities. After irradiation, the cavities were warmed to 250 K, then recooled to investigate the effects of a room-temperature annealing cycle on the superconducting properties of the irradiated cavities. A detailed description of the experiment and the results shall be presented. These results are important to employing superconducting RF technology to future high-intensity proton accelerators for use in research and transmutation technologies. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Rusnak, B (reprint author), Univ Calif Los Alamos Natl Lab, MS H817, Los Alamos, NM 87545 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3096 EP 3098 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801006 ER PT B AU Phillips, L Mammosser, J Nguyen, V AF Phillips, L Mammosser, J Nguyen, V BE Comyn, M Craddock, MK Reiser, M Thomson, J TI New window design options for CEBAF energy upgrade SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB As the Jefferson Laboratory upgrades the existing CEBAF electron accelerator to operate at higher energies, the fundamental power coupler windows will be required to operate with lower RF dissipation and increased immunity to radiation from cavity field emission. New designs and modifications to existing designs which can achieve these goals are described. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Phillips, L (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 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 0-7803-4376-X PY 1998 BP 3102 EP 3104 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801008 ER PT B AU Reece, CE Drury, M Rao, MG Nguyen-Tuong, V AF Reece, CE Drury, M Rao, MG Nguyen-Tuong, V BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Improvement of the operational performance of SRF cavities via in situ helium processing and waveguide vacuum processing SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The useful performance range of the superconducting rf (SRF) cavities in the CEBAF accelerator at Jefferson Lab is frequently limited by electron field emission and derived phenomena. Improvements are required to support future operation of the accelerator at higher than 5 GeV. Twelve operational cryomodules have been successfully processed to higher useful operating gradients via rf-helium processing. Progress against field emission was evidenced by improved high-held Q, reduced x-ray production and greatly reduced incidence of arcing at the cold ceramic window. There was no difficulty reestablishing beamline vacuum following the processing. Cavities previously limited to 4-6 MV/m are now operating stably at 6-9 MV/m. By applying a pulsed-rf processing technique, we have also improved the pressure stability of the thermal transition region of the input waveguide for several cavities. [1]. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23602 USA. RP Reece, CE (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23602 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 0-7803-4376-X PY 1998 BP 3105 EP 3107 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801009 ER PT B AU Wiseman, M Benesch, J Drury, M Fisher, J Machie, D Mammosser, J Phillips, L Preble, J AF Wiseman, M Benesch, J Drury, M Fisher, J Machie, D Mammosser, J Phillips, L Preble, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Jefferson Lab IR FEL cryomodule modifications and test results SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Infrared Free Electron Laser being constructed at the Thomas Jefferson National Accelerator Facility will require a 42 MeV, 5 mA electron accelerator. The accelerator design requires a 10 MeV injector and a two pass 32 MeV linac, one pass for acceleration and one pass for energy recovery. In order to minimize the cost of the linac, standard CEBAF 1497 MHz Superconducting Radio Frequency cavities and cryomodules are being used with minimal changes. Two SRF cavities, housed in a quarter cryomodule, operate at a nominal 10 MV/m to provide the injector energy. The linac is composed of one cryomodule, housing eight SRF cavities operating at an average gradient of 8 MV/m. The modifications to the cryomodule are being made to handle the higher beam current, to improve RF control, and to increase machine reliability. The modifications to the higher order mode (HOM) loads, cavity tuners, cavity beam line, warm and cold RF windows, and cryogenic shield are described. Test results from the injector quarter cryomodule are also presented. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Wiseman, M (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 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 0-7803-4376-X PY 1998 BP 3108 EP 3110 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801010 ER PT B AU Horan, D Nassiri, A Schwartz, C AF Horan, D Nassiri, A Schwartz, C BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Phase loop bandwidth measurements on the Advanced Photon Source 352-MHz rf systems SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Phase loop bandwidth tests were performed on the Advanced Photon Source storage ring 352-MHz rf systems. These measurements were made using the HP3563A Control Systems Analyzer, with the rf systems running at 30 kilowatts into each of the storage ring cavities, without stored beam. An electronic phase shifter was used to inject approximately 14 degrees of stimulated phase shift into the low-level rf system, which produced measurable response voltage in the feedback loops without upsetting normal rf system operation. With the PID (proportional-integral-differential) amplifier settings at the values used during accelerator operation, the measurement data revealed that the 3-dB response for the cavity sum and klystron power-phase loops is approximately 7 kHz and 45 kHz, respectively, with the cavities the primary bandwidth-limiting factor in the cavity-sum loop. Data were taken at various PID settings until the loops became unstable. Crosstalk between the two phase loops was measured. 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. 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 0-7803-4376-X PY 1998 BP 3111 EP 3113 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801011 ER PT B AU Carlsten, BE Ferguson, P AF Carlsten, BE Ferguson, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Large-signal klystron simulations using KLSC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We describe large-signal klystron simulations using the particle-in-cell code KLSC. This code uses the induced-current model to describe the steady-state cavity modulations and resulting rf fields, and advances the space-charge fields through Maxwell's equations. In this paper, an eight-cavity, high-power S-band klystron simulation is used to highlight various aspects of this simulation technique. In particular, there are specific issues associated with modeling the input cavity, the gain circuit, and the large-signal circuit (including the output cavities), that have to be treated carefully. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Carlsten, BE (reprint author), Univ Calif Los Alamos Natl Lab, MS H851,L-9,POB 1663, Los Alamos, NM 87545 USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3129 EP 3131 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801017 ER PT B AU Carlsten, BE AF Carlsten, BE BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Rippled-beam free-electron laser SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We describe a new microwave generation mechanism involving a scalloping annular electron beam. The beam interacts with the axial electric field of a TM02 mode in a smooth circular waveguide through the axial free-electron laser interaction, in which the beam ripple period is synchronous with the phase slippage of the rf mode relative to the electron beam. Due to nonlinearities in the orbit equation, the interaction can be made autoresonant, where the phase and amplitude of the gain is independent of the beam energy. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Carlsten, BE (reprint author), Univ Calif Los Alamos Natl Lab, MS H851,L-9,POB 1663, Los Alamos, NM 87545 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3132 EP 3134 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801018 ER PT B AU Earley, LM Carlsten, BE Fazio, MV Fortgang, CM Haddock, PC Haynes, WB AF Earley, LM Carlsten, BE Fazio, MV Fortgang, CM Haddock, PC Haynes, WB BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Annular-beam, 17GHz free-electron maser experiment SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID WAVE-GUIDES; LASER AB Experiments have been conducted on a 15-17 GHz free electron maser (FEM) for producing a 500 MW output pulse with a phase stability appropriate for linear collider applications. The electron beam source is a 1 mu s, 800 kV, 5 kA, 6-cm-dia annular electron beam machine called BANSHEE. The beam interactes with the TM02 and TM03 mode Raman FEM amplifier in a corrugated cylindrical waveguide where the beam runs close to the interaction device walls to reduce the power density in the fields. This greatly reduces the kinetic energy loss caused by the beam potential depression associated with the space charge which is a significant advantage in comparison with conventional solid beam microwave tubes at the same beam current. The experiment operates in a single shot mode with a large number of diagnostics to measure power, frequency and energy. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM earley-lawrence-m@lanl.gov; bcarlsten@lanl.gov; mfazio@lanl.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 0-7803-4376-X PY 1998 BP 3135 EP 3137 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801019 ER PT B AU Tallerico, P Billen, J Jason, A Lynch, M Wangler, T Young, L AF Tallerico, P Billen, J Jason, A Lynch, M Wangler, T Young, L BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The RF system for the National Spallation Neutron Source linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The National Spallation Neutron Source (NSNS) system has been proposed to dramatically improve the neutron capabilities for science applications in the US. The NSNS is a fast pulse neutron source that would consist of a 1000 MeV H- linac, an accumulator ring, a neutron target, and an experimental area. Although the NSNS is to be built at Oak Ridge, the design responsibility is delegated to five US national laboratories, and the Los Alamos National Laboratory is responsible for the linac portion of this machine, from the output of the radio frequency quadrupole (RFQ) accelerator, to the entrance to the accumulator ring. In the baseline design, a total of fifty-nine klystrons are used to provide the rf power for a 1-MW average power beam in the accumulator ring, and a 1.04 ms pulse length, 6.24% duty factor beam in the linac. The frequencies chosen are 402.5 MHz for the RFQ and drift tube linac (DTL) portions of the machine, and 805 MHz for the coupled-cavity DTL (CCDTL) and coupled cavity (CCL) portions of the linac. The baseline 805 MHz klystron is capable of 2.5-MW peak power into a flat load, and it contains a modulating anode. The backup 805 MHz klystron is cathode pulsed, and has a 5-MW peak output power. The modulators for these two klystrons are vastly different. The challenges and compromises for the two klystrons and their associated modulators and RF systems are discussed. The baseline design RF system is presented in detail. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Tallerico, P (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3138 EP 3140 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801020 ER PT B AU Nelson, R Holben, S AF Nelson, R Holben, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Operating experience and reliability improvements on the 5 kW CW klystron at Jefferson Lab SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB With substantial operating hours on the RF system, considerable information on reliability of the 5 kW CW klystrons has been obtained. High early failure rates led to examination of the operating conditions and failure modes. Internal ceramic contamination caused premature failure of gun potting material and ultimate tube demise through arcing or ceramic fracture. A planned course of repotting and reconditioning of approximately 300 klystrons, plus careful attention to operating conditions and periodic analysis of operational data, has substantially reduced the failure rate. It is anticipated that implementation of planned supplemental monitoring systems for the klystrons will allow most catastrophic failures to be avoided. By predicting end of life, tubes can be changed out before they fail, thus minimizing unplanned downtime. Initial tests have also been conducted on this same klystron operated at higher voltages with resultant higher output power. The outcome of these tests will provide information to be considered for future upgrades to the accelerator. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Nelson, R (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, 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 0-7803-4376-X PY 1998 BP 3165 EP 3167 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801029 ER PT B AU Nassiri, A Grelick, A Kustom, RL White, M AF Nassiri, A Grelick, A Kustom, RL White, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI High peak power test of S-band waveguide switches SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The injector and source of particles for the Advanced Photon Source (APS) is a 2856-MHz S-band electron-positron linear accelerator (linac) which produces electrons with energies up to 650 MeV or positrons with energies up to 450 MeV. To improve the linac rf system availability, an additional modulator-klystron subsystem is being constructed to provide a switchable hot spare unit for each of the five existing S-band transmitters. The switching of the transmitters will require the use of SF6-pressurized waveguide switches at a peak operating power of 35 MW. A test stand was set up at the Stanford Linear Accelerator Center (SLAC) Klystron-Microwave laboratory to conduct tests characterizing the power handling capability of these waveguide switches. Test results are presented. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM mwhite@aps.anl.gov NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3174 EP 3176 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801032 ER PT B AU Cummings, K Rees, D Roybal, W Lenci, S Risbud, S Shang, C Wilcox, D AF Cummings, K Rees, D Roybal, W Lenci, S Risbud, S Shang, C Wilcox, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Experimental evaluation of 350 MHz RF accelerator windows for the low energy demonstration accelerator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Radio frequency (RF) windows are historically a point where failure occurs in input power couplers for accelerators. To obtain a reliable, high-power, 350 MHz RF window for the Low Energy Demonstration Accelerator (LEDA) project of the Accelerator Production of Tritium program, RF window prototypes from different vendors were tested. Experiments were performed to evaluate the RF windows by the vendors to select a window for the LEDA project. The Communications and Power Industies, Inc. (CPI) windows were conditioned to 445 kW in roughly 15 hours. At 445 kW a window failed, and the cause of the failure will be presented. The EEV windows were conditioned to 944 kW in 26 hours and then tested at 944 kW for 4 hours with no indication of problems. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Cummings, K (reprint author), Univ Calif 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 0-7803-4376-X PY 1998 BP 3183 EP 3185 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801035 ER PT B AU Fowkes, WR Jongewaard, EN Loewen, RJ Tantawi, SG Vlieks, AE AF Fowkes, WR Jongewaard, EN Loewen, RJ Tantawi, SG Vlieks, AE BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An all-metal high power circularly polarized X-band RF load SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A compact rf load has been designed using a cascaded array of lossy radial rf chokes to dissipate 100 MW peak and 8 kW average power uniformly along the length of the load. Operation in the circularly polarized TE11 mode assures uniform dissipation azimuthally as well. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Fowkes, WR (reprint author), Stanford Univ, 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 0-7803-4376-X PY 1998 BP 3189 EP 3191 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801037 ER PT B AU Tantawi, SG Adolphsen, C Holmes, S Lavine, T Loewen, RJ Nantista, C Pearson, C Pope, R Rifkin, J Ruth, RD Vlieks, AE AF Tantawi, SG Adolphsen, C Holmes, S Lavine, T Loewen, RJ Nantista, C Pearson, C Pope, R Rifkin, J Ruth, RD Vlieks, AE BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The next linear collider test accelerator's rf pulse compression and transmission systems SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The overmoded rf transmission and pulsed power compression system for SLAC's Next Linear Collider (NLC) program requires a high degree of transmission efficiency and mode purity to he economically feasible. To this end, a number of new, high power components and systems have been developed at X-band, which transmit rf power in the low loss, circular TE01 mode with negligible mode conversion. In addition, a highly efficient SLED-II* pulse compressor has been developed and successfully tested at high power. The system produced a 200 MW, 250 ns wide pulse with a near-perfect flat-top. In this paper we describe the design and test results of the high power pulse compression system using SLED-II. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Tantawi, SG (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 3192 EP 3194 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801038 ER PT B AU Vlieks, AE Fowkes, WR Loewen, RJ Tantawi, SG AF Vlieks, AE Fowkes, WR Loewen, RJ Tantawi, SG BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Upgrade of the SLAC SLED-II pulse compression system based on recent high power tests SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In the Next Linear Collider(NLC) it is expected that the high power rf components be able to handle peak power levels in excess of 400 MW. We present recent results of high power tests designed to investigate the RF breakdown limits of the X-band pulse compression system used at SLAG. (SLED-II). Results of these tests show that both the TE01-TE10 mode converter and the 4-port hybrid have a maximum useful power limit of 220-250 MW. Based on these tests, modifications of these components have been undertaken to improve their peak field handling capability. Results of these modifications will be presented. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Vlieks, AE (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 3195 EP 3197 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801039 ER PT B AU McInturff, AD Benjegerdes, R Bish, P Caspi, S Chow, K Dell'Orco, D Dietderich, D Hannaford, R Harnden, W Higley, H Lietzke, A Morrison, L Morrison, M Scanlan, R Smithwick, J Taylor, C van Oort, J AF McInturff, AD Benjegerdes, R Bish, P Caspi, S Chow, K Dell'Orco, D Dietderich, D Hannaford, R Harnden, W Higley, H Lietzke, A Morrison, L Morrison, M Scanlan, R Smithwick, J Taylor, C van Oort, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Test results for a high field (13T) Nb3Sn dipole SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A Nb3Sn dipole magnet (D20) has been designed, constructed, and tested at LBNL. previously, we had reported III test results from a hybrid design dipole which contained a similar inner Nb3Sn and outer NbTi winding. This paper presents the final assembly characteristics and parameters which will be compared with those of the original magnet design [2]. The actual winding size was determined and a secondary calibration of the assembly pre-load was done by pressure sensitive film. The actual azimuthal and radial D20 pre-loading was accomplished by a very controllable novel stretched wire technique. D20 reached 12.8T(4.4K) and 13.5T(1.8K) the highest dipole magnetic fields obtained to date in the world. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP McInturff, AD (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 6 TC 8 Z9 8 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3212 EP 3214 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801044 ER PT B AU Marks, S Cortopassi, C DeVries, J Hoyer, E Leinbach, R Minamihara, Y Padmore, H Pipersky, P Plate, D Schlueter, R Young, A AF Marks, S Cortopassi, C DeVries, J Hoyer, E Leinbach, R Minamihara, Y Padmore, H Pipersky, P Plate, D Schlueter, R Young, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The advanced light source elliptically polarizing undulator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An elliptically polarizing undulator (EPU) for the Advanced Light Source (ALS) has been designed and is curently under construction. The magnetic design is a moveable quadrant pure permanent magnet structure featuring adjustable magnets to correct phase errors and on-axis field integrals. The device is designed with a 5.0 cm period and will produce variably polarized light of any ellipticity, including pure circular and linear. The spectral range at 1.9 GeV for typical elliptical polarization with a degree of circular polarization greater than 0.8 will be from 100 eV to 1500 eV, using the first, third, and fifth harmonics. The device will be switchable between left and right circular modes at a frequency of up to 0.1 Hz. The 1.95 m long overall length will allow two such devices in a single ALS straight sector. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Marks, S (reprint author), Lawrence Berkeley Lab, 46-161,1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 3 TC 2 Z9 2 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3221 EP 3223 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801047 ER PT B AU Moog, ER Vasserman, I Borland, M Dejus, R Den Hartog, PK Gluskin, E Maines, J Trakhtenberg, E AF Moog, ER Vasserman, I Borland, M Dejus, R Den Hartog, PK Gluskin, E Maines, J Trakhtenberg, E BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Magnetic performance of insertion devices at the advanced photon source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The insertion devices (IDs) at the Advanced Photon Source have been magnetically tuned to minimize the integrals of the field through the devices and to minimize the variation of those integrals with gap, with a goal of not perturbing the stored particle beam. Measurements of the particle beam motion as the ID gap was changed found that the closed-orbit distortion was better than the requirement and agreed well with predictions based on magnetic measurement results. Another goal of the magnetic tuning is to ensure high brilliance in the low-order harmonics by keeping the rms phase error small. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Moog, ER (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 3224 EP 3226 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801048 ER PT B AU Kim, SH Doose, C AF Kim, SH Doose, C BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Temperature compensation of NdFeB permanent magnets SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Permanent magnet blocks of NdFeB have a relatively high maximum energy product. Because of its relatively low Curie temperature, however, NdFeB has a large temperature coefficient for its residual induction. The temperature coefficients of the relative magnetic fields (Delta B/B)/Delta T in the air gap of NdFeB dipole magnets were reduced from -1.1 x 10(-3)/degrees C to less than 2 x 10(-5)/degrees C under operating temperatures of +/- 6 degrees C. This was achieved passively by using 1.25-mm-thick strips of 30%-Ni-Fe alloy as flux shunts for the NdFeB blocks. The magnets with soft-steel poles and flux-return yokes were assembled and measured in a temperature-controlled environment. 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. NR 2 TC 0 Z9 0 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3227 EP 3229 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801049 ER PT B AU Brown, RL Etkin, A Foley, KJ Leonhardt, WJ Mills, JA Polk, I Rodger, ES Scheblein, JA Schlueter, RD AF Brown, RL Etkin, A Foley, KJ Leonhardt, WJ Mills, JA Polk, I Rodger, ES Scheblein, JA Schlueter, RD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The star detector magnet subsystem SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The RHIC (Relativistic Heavy Ion Collider) Accelerator currently under construction at Brookhaven National Laboratory will have large detectors at two of its six intersection regions. One of these detectors, known as STAR (Solenoidal Tracker At RHIC), weighs 1100 tons and is being built around a large solenoid magnet. The magnet is 7.32 m in diameter, 7.25 m long and utilizes three different sizes of room temperature aluminum coils. The magnet will operate with a field set from 0.25 T to 0.5 T and have a field uniformity of better than 1000 ppm over a portion of its interior region. This paper describes the magnet design, fabrication and assembly requirements and presents the current construction status. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Brown, RL (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3230 EP 3232 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801050 ER PT B AU Tuozzolo, J Brodowski, J Danby, G Jackson, J Meng, W AF Tuozzolo, J Brodowski, J Danby, G Jackson, J Meng, W BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Magnets for the national spallation neutron source accumulator ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The National Spallation Neutron Source Accumulator Ring(1) will require large aperture dipole magnets, strong focusing quadrupole magnets, and smaller low field dipole, quadrupole, and sextupole correcting magnets. Ail of the magnets will provide a fixed magnetic field throughout the accumulator's fill/storage/extraction cycle. Similar fixed field magnets will also be provided for the beam transport systems. Because of the high intensity in the accumulator, the magnets must be designed with high tolerances for optimum field quality and for the high radiation environment which may be present at the injection/extraction areas, near the collimators, and near the target area. Field specifications and field plots are presented as well as planned fabrication methods and procedures, cooling system design, support, and installation. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Tuozzolo, J (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 0-7803-4376-X PY 1998 BP 3233 EP 3235 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801051 ER PT B AU Bhat, CM Brown, BC Harding, DJ Fang, SJ Martin, PS Glass, HD Sim, JW Walbridge, DGC AF Bhat, CM Brown, BC Harding, DJ Fang, SJ Martin, PS Glass, HD Sim, JW Walbridge, DGC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Magnetic field measurements of the main injector sextupole magnets SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Fermilab Main Injector (MI) will accelerate (decelerate) protons and anti-protons from 8.9 GeV/c to 150 GeV/c (150 GeV/c to 8.9 GeV/c). To achieve high intensity stable beam in the MI throughout the acceleration or deceleration mode, two families of chromaticity compensation sextupole magnets are planned. The operating schemes for the chromaticity compensation systems will be different for the two modes because of the hysteresis of the sextupole magnets and the changed sign of the sextupole held component from beam tube eddy currents in the dipoles. Hence we have carried out detailed magnetic held measurements on some sextupole magnets. Here we present the results of the measurements and their implications on the acceleration and the deceleration cycles of the MI. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Bhat, CM (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3242 EP 3244 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801054 ER PT B AU Brown, BC Bhat, CM Harding, DJ Martin, PS Wu, G AF Brown, BC Bhat, CM Harding, DJ Martin, PS Wu, G BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design for Fermilab main injector magnet ramps which account for hysteresis SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Although the dominant fields in accelerator electromagnets are proportional to the excitation current, precise control of accelerator parameters requires a detailed understanding of the fields in Main Injector[1] [2]magnets including contribution from eddy currents, magnet saturation, and hysteresis. Operation for decelerating beam makes such considerations particularly significant. Analysis of magnet measurements and design of control system software is presented. Field saturation and its effects on low field hysteresis are accounted for in specifying the field ramps for dipole, quadrupole and sextupole magnets. Some simplifying assumptions are made which are accepted as limitations on the required ramp sequences. Specifications are provided for relating desired field ramps to required current ramps for the momentum, tune, and chromaticity control. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Brown, BC (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 11 TC 1 Z9 1 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3245 EP 3247 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801055 ER PT B AU Chester, N Makarov, A Schlabach, P Terechkine, I Walbridge, D Wokas, T Yarba, V Larson, DJ AF Chester, N Makarov, A Schlabach, P Terechkine, I Walbridge, D Wokas, T Yarba, V Larson, DJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Magnet development for the BRF positron emission tomography accelerator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A collaboration involving the Biomedical Research Foundation, Science Applications International Corporation, Fermi National Accelerator Laboratory, and the University of Washington is developing an accelerator for producing isotopes for Positron Emission Tomography (PET) scans. The Medium Energy Beam Transport (MEBT) section of this accelerator takes a small beam from a first RFQ acceleration device and matches it into a small 3D-acceptance at a second RFQ section. The beam transport system was designed to prevent beam losses due to emittance growth. The system includes two bending dipoles and seven quadrupoles of three different types. This report contains a brief description of the MEET magnets and their electric, magnetic and thermal properties. The magnet measurements show that each of the magnets meets the system requirements. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Chester, N (reprint author), Fermi Natl Accelerator Lab, 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 0-7803-4376-X PY 1998 BP 3248 EP 3250 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801056 ER PT B AU Fang, S Chou, W AF Fang, S Chou, W BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Analysis and measurements of eddy current effects of a beam tube in a pulsed magnet SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The power supply design of the gamma(t) - jump system in FNAL Main Injector uses a resonant circuit[1]. A critical design parameter is the ac losses of the beam tube in a pulsed quadrupole. This paper gives an analysis to this problem. An equivalent circuit model based on the impedance measurement was established. The measured and calculated losses are in agreement. Another effect of the eddy current is the distortion of the magnetic field inside the beam tube. A Morgan coil was used for field measurements up to 10 KHz. These results are presented in this paper. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Fang, S (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. 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 0-7803-4376-X PY 1998 BP 3251 EP 3253 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801057 ER PT B AU Fowler, WB Brown, B Volk, J AF Fowler, WB Brown, B Volk, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Experience with the procurement of ferrite and temperature compensator for permanent magnets for accelerators SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The use of permanent magnets for transporting the 8 GeV proton beam from the Fermilab Booster to the new Fermilab Main Injector accelerator has been implemented and the magnets for a new 8 GeV ring to be installed in the Main Injector tunnel for increasing the luminosity of pbar/p collisions in the Tevatron are about to start being produced. Strontium oxide ferrite was selected for the magnets due to it's low cost and satisfactory magnetic properties for the 1.5 kilogauss fields required in the 2-inch gap magnets. Fermilab has received 96,000 pounds of ferrite and by working with the Vendor (HITACHI, Edmore, MI) improved uniformity of Residual Induction (Br) has reached 3905 gauss +/-0.65%. Further details are given in the paper. Overcoming the magnetic field variation when the temperature of the magnets changes is accomplished by incorporation of approximately 30% nickel steel alloy. The ferrite changes approximately o.2% per degree C, which is compensated for by the 13% by volume of compensator alloy incorporated in the magnet. Fourteen thousand (14,000) pounds of this material has been received and in order to obtain sufficient uniformity we mixed equal amounts from each batch into each magnet. Results of this process are given in the paper. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Fowler, WB (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3254 EP 3256 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801058 ER PT B AU Glass, HD Brown, BC Foster, GW Fowler, WB Haggard, JE Harding, DJ Jackson, GP May, MP Nicol, TH Ostiguy, JF Schlabach, P Smith, GA Volk, JT AF Glass, HD Brown, BC Foster, GW Fowler, WB Haggard, JE Harding, DJ Jackson, GP May, MP Nicol, TH Ostiguy, JF Schlabach, P Smith, GA Volk, JT BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Permanent dipole magnets for the 8 GeV transfer line at FNAL SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The transfer line that will serve to transport 8 GeV protons from the Booster to the new Fermilab Main Injector has been built using permanent magnets. A total of 46 horizontal bend dipoles and 5 vertical bend dipoles were built for this beamline; 67 gradient magnets [1] were also built. The magnets were built using magnetized strontium ferrite bricks. Thermal compensation of these bricks was effected by use of a nickel-iron alloy. The dipole magnets were built with a mean integrated strength of 0.56954 T-m, and an rms spread of 0.06%. The magnets were thermally cycled from 20 degrees C to 0 degrees C to condition the ferrite against irreversible thermal losses, and the compensation was measured with a flipcoil. The magnet strength was adjusted by varying the number of bricks installed at the magnet ends. Details of the assembly process and a summary of magnetic measurements are presented here. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Glass, HD (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3257 EP 3259 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801059 ER PT B AU Glass, HD Brown, BC Foster, GW Fowler, WB Gustafson, R Jackson, GP Ostiguy, JF Volk, JT AF Glass, HD Brown, BC Foster, GW Fowler, WB Gustafson, R Jackson, GP Ostiguy, JF Volk, JT BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Stability tests of permanent magnets built with strontium ferrite SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Permanent magnets built using strontium ferrite bricks have been tested for stability against demagnetization. Ten test dipoles were built to monitor ferrite behavior under a variety of stressing conditions, including irradiation, mechanical shock, extreme thermal excursions, and long term magnetization stability. The test magnets were geometrically similar to, but much shorter than, the magnets built for the 8 GeV transfer line at FNAL. No loss of magnetization was observed for bricks exposed to a proton beam, and a magnet exposed to several Gigarads of Co-60 gamma radiation suffered no measurable demagnetization. The magnet strength was observed to decrease logarithmically with time, consistent with the expected effect of thermal fluctuations. Irreversible demagnetization of similar to 0.1% was seen in cooling magnets to 0 degrees C, and the loss was similar to 0.2% for magnets cooled to -20 degrees C. No additional demagnetization was seen on subsequent cycling to 0 degrees C. Finally, one of the long dipoles built for the 8 GeV line was periodically tested over the course of 3 months, and showed no measurable demagnetization. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Glass, HD (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3260 EP 3262 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801060 ER PT B AU Glass, HD Bertsche, KJ Brown, BC Foster, GW Fowler, WB Haggard, JE Harding, DJ Jackson, GP May, MP Nicol, TH Ostiguy, JF Schlabach, P Smith, GA Volk, JT AF Glass, HD Bertsche, KJ Brown, BC Foster, GW Fowler, WB Haggard, JE Harding, DJ Jackson, GP May, MP Nicol, TH Ostiguy, JF Schlabach, P Smith, GA Volk, JT BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Permanent gradient magnets for the 8 GeV transfer line at FNAL SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The 8 GeV transfer line feeding protons into the new Fermilab Main Injector has been built using strontium ferrite permanent magnets. This article addresses the design and manufacture of the 67 combined function magnets; permanent horizontal and vertical bend dipoles [1] and quadrupoles were also built. The combined function magnets were built with a mean integrated strength at midaperture of 0.56953 T-m (central field nominally 0.15 T), and a gradient of 3.23% per cm relative to the dipole strength (nominal gradient = 0.48 T/m). Thermal compensation of these bricks was effected by use of a nickel-iron alloy. The magnets were thermally cycled from 20 degrees C to 0 degrees C to condition the ferrite against irreversible thermal losses; the compensation was measured with a flipcoil and verified with a rotating harmonics coil. We present details of the magnet assembly process and also summarize the magnetic measurements. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Glass, HD (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3263 EP 3265 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801061 ER PT B AU Haggard, E AF Haggard, E BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Automated permanent magnet magnetization system for 8 GeV transfer line and recycler ring production at Fermilab SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Recycler antiproton storage ring and the 8 GeV beam transfer line between the Fermilab Booster and the Main Injector are constructed using permanent magnet ferrite bricks surrounding a steel pole and housed inside a steel flux return shell. The transfer line consists of 51 dipoles, 67 gradient magnets, and 8 quadrupoles. The Recycler ring consists of approximately 350 gradient magnets and 60 quadrupoles. These magnet assemblies are being produced at Fermilab currently and as a part of the tooling required to produce these assemblies we have designed, built and put into production an automated permanent magnet magnetization system. The system includes a conventional B-2 type dipole, a Programmable Logic Controller (PLC) controlled brick mover, a half-probe measurement station and an TBM Compatible P.C. for data acquisition. The system has been used in the production of the 8 GeV beam transfer line magnet assemblies each requiring several hundred individual permanent magnets. This paper describes and illustrates the design of the automated system, the data acquisition, use of FEA analysis in the design, and the experience we have had using this production system. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Haggard, E (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3266 EP 3268 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801062 ER PT B AU Harding, DJ Brown, BC DiMarco, J Glass, HD Kroc, TK Martin, PS Mishra, CS Walbridge, DGC Pewitt, EG AF Harding, DJ Brown, BC DiMarco, J Glass, HD Kroc, TK Martin, PS Mishra, CS Walbridge, DGC Pewitt, EG BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Magnetic field strength and shape measurements of the Fermilab Main Injector quadrupoles SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB All of the new quadrupoles for the Fermilab Main Injector ring have been built and measured. The magnets are 2.95 m and 2.54 m in length with a 41.7 mm bore. In operation, the magnets run from 1.61 T/m at 8.9 GeV/c to 15.7 T/m at 120 GeV/c and 19.6 T/m at 150 GeV/c. These points correspond to injection, Main Injector fixed target physics and antiproton production, and extraction for transfer to the Tevatron. Good field uniformity is required to ensure a stable beam over the whole acceleration cycle. A significant octupole is included to assist in resonant extraction. The performance of these quadrupoles, in both integrated strength and field uniformity, is presented. All magnets produced meet the accelerator requirements. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Harding, DJ (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3269 EP 3271 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801063 ER PT B AU Johnson, DE DiMarco, JE Harding, DJ Martin, PS Ostiguy, JF Walbridge, DGC Baiod, R AF Johnson, DE DiMarco, JE Harding, DJ Martin, PS Ostiguy, JF Walbridge, DGC Baiod, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design and magnetic measurements of the Fermilab Main Injector Lambertson SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A new 1.1 Tesla Lambertson for Main Injector injection/extraction and Tevatron injection has been designed and the magnetic properties of the first production magnet have been measured. The Main Injector Lambertsons will be used for injection of 8.9 GeV/c antiprotons from the Antiproton Source and 150 GeV/c antiprotons recycled from the Tevatron, and the extraction of 120 GeV/c protons for antiproton production, 150 GeV/c protons for Tevatron Injection, 120 GeV/c resonant extraction, and the Main Injector abort. This magnet must accommodate Main Injector and Tevatron circulating beam in its field free region while the held region is at all excitation levels with minimal impact on the circulating beam. The design specifications and results of magnetic measurements in both the held region and field free region for the first production magnet are discussed. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Johnson, DE (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3272 EP 3274 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801064 ER PT B AU Martin, PS Harding, DJ Pewitt, EG Russell, AD AF Martin, PS Harding, DJ Pewitt, EG Russell, AD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Variations in the steel properties and the excitation characteristics of Fermilab Main Injector dipoles SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Fermilab Main Injector project is building 344 dipoles, for which over 7000 tons of steel are required. Budgetary and logistic constraints prevented purchasing all of the steel required prior to production. Run to run variations in the magnetic properties of the steel have produced variations in the excitation curves of the dipoles. The variations in the B(H) curves for the steel as a function of run number, and the excitation characterisitics of the dipoles, are discussed. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Martin, PS (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3275 EP 3277 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801065 ER PT B AU Martin, PS Baiod, R Harding, DJ Ostiguy, JF Russell, AD AF Martin, PS Baiod, R Harding, DJ Ostiguy, JF Russell, AD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Modifications to the excitation characteristics of Fermilab Main Injector dipoles by machining SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Twelve dipole magnets were built under the R&D phase of the Fermilab Main Injector project using steel from a different vendor than the production vendor. These dipoles exhibited an excitation-dependent difference in strength relative to the production magnets, with a maximum difference of about 1% observed at high field. This difference was too large to allow them to be used in the project. From calculations based on the differences in the B(H) curves of the two types of steel, the high-field strength of the twelve R&D dipoles was reduced by machining the back-legs of the cores. The machining technique will be described, and excitation curves before and after machining will be compared. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Martin, PS (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3278 EP 3279 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801066 ER PT B AU May, MP Foster, GW Jackson, GP Volk, JT AF May, MP Foster, GW Jackson, GP Volk, JT BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The design and construction of the permanent magnet Lambertson for the recycler ring at Fermilab SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper will show and discuss the simple design of a permanent magnet Lambertson used to extract and inject 8 GeV. beam from the Fermilab Main Injector Ring to the Recycler Ring, and from the Recycler Ring to the Main Injector. Pictures will show how four different magnets used to form the injection and extraction double dog legs are made from one universal design. Detailed assembly drawings will illustrate the construction techniques using solid pieces of steel instead of laminations. The field strength in both the bending region and the field free region will be discussed along with temperature compensation of the strontium ferrite magnetic bricks. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP May, MP (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3280 EP 3282 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801067 ER PT B AU McGee, MW Hurh, PG Bertsche, KJ AF McGee, MW Hurh, PG Bertsche, KJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design and fabrication of an achromatic bend for medium energy electron cooling at Fermilab SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The use of an achromatic bend for a medium energy electron cooling beamline in the new Recycler Ring at Fermilab is required to ensure a stable beam position. This first order 180 degrees achromat consists of two 90 degrees dipoles with a 61 cm bend radius and a central dispersion-suppressing quadrupole flanked symmetrically by a weak solenoid and an air-core cos(2 theta) quadrupole. The mechanical design and technique of fabrication for each bend component is discussed. Each of the air cooled mechanical designs are simple yet precise in terms of construction technique. The results of magnetic field measurements are also presented. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP McGee, MW (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3283 EP 3285 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801068 ER PT B AU Pruss, SM Brown, BC Foster, GW Glass, HD Harding, DJ Jackson, GP May, MP Ostiguy, JF Volk, JT AF Pruss, SM Brown, BC Foster, GW Glass, HD Harding, DJ Jackson, GP May, MP Ostiguy, JF Volk, JT BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Hybrid permanent quadrupoles for the 8 GeV transfer line at Fermilab SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Hybrid Permanent Magnet Quadrupoles for specialized portions of the 8 GeV transfer line from the Fermilab Booster to the new Main Injector have been built, tested and installed. These magnets use a 0.635 m long iron shell and provide an integrated gradient of 1.48 T-m/m with an iron pole tip radius of 0.0416 m. and pore length of 0.508 m. Bricks of 0.0254 m thick strontium ferrite supply the flux to the back of the pole to produce the desired 2.91 T/m gradient. For temperature compensation, Ni-Fe alloy strips are interspersed between ferrite bricks to subtract flux in a temperature dependent fashion. Adjustments of the permeance of each pole using iron between the pole and the flux return shell permits the matching of pole potentials. Magnetic potentials of the poles are measured with a Rogowski coil and adjusted to the desired value to achieve the prescribed strength and field uniformity. After these adjustments, the magnets are measured using a rotating coil to determine the integral gradient and the harmonics. These measurements are used to calibrate the production Rogowski coil measurements. Similar quadrupoles are included in the design of the Fermilab Recycler. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Pruss, SM (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3286 EP 3287 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801069 ER PT B AU Russell, AD Baiod, R Brown, BC Harding, DJ Martin, PS AF Russell, AD Baiod, R Brown, BC Harding, DJ Martin, PS BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Selecting magnet laminations recipes using the method of simulated annealing SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Fermilab Main Injector project is building 344 dipoles using more than 7000 tons of steel. There were significant run-to-run variations in the magnetic properties of the steel. Differences in stress relief in the steel after stamping resulted in variations of gap height. To minimize magnet-to-magnet strength and field shape variations the laminations were shuffled based on the available magnetic and mechanical data and assigned to magnets using a computer program based on the method of simulated annealing, The lamination sets selected by the program have produced magnets which easily satisfy the design requirements. This paper discusses observed gap variations, the program structure and the strength uniformity results for the magnets produced. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Russell, AD (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3288 EP 3290 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801070 ER PT B AU Harding, DJ Carson, JA Chester, NS Garvey, JD Krafczyk, GE Makarov, A Terechkine, I Yarba, VA AF Harding, DJ Carson, JA Chester, NS Garvey, JD Krafczyk, GE Makarov, A Terechkine, I Yarba, VA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Air-cooled trim dipoles for the Fermilab Main Injector SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB New horizontal and vertical trim dipoles have been designed for the Fermilab Main Injector (FMI) and are being assembled in the Fermilab Technical Division. Magnets are 42.6 cm in length (30.5 cm steel length) and have similar cross-section dimensions. The horizontal (vertical) magnet gap is 50.8 mm (127 mm) and the target integrated strength is 0.072 T*m (0.029 T*m). The major design effort lay in making air cooling possible for these magnets. This report presents the magnets' thermal and magnetic properties and discusses the limitation on excitation current. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Harding, DJ (reprint author), Fermi Natl Accelerator Lab, POB 500,MS 232, 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 0-7803-4376-X PY 1998 BP 3291 EP 3293 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801071 ER PT B AU Barlow, D Shafer, R Martinez, R Walstrom, P Kahn, S Jain, A Wanderer, P AF Barlow, D Shafer, R Martinez, R Walstrom, P Kahn, S Jain, A Wanderer, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Magnetic design and measurement of nonlinear multipole magnets for the APT beam expander system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Two prototype nonlinear multipole magnets have been designed for use in the 800-MeV beam test of the APT beam-expansion concept at LANSCE. The iron-dominated magnets each consist of three independent coils, two for producing a predominately octupole field with a tunable duodecapole component, and one for canceling the residual quadrupole field. Two such magnets, one for shaping each transverse plane, are required to produce a rectangular, uniform beam current density distribution with sharp edges on the APT target. This report will describe the magnetic design of these magnets, along with field measurements, and a comparison to the magnetic design. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Barlow, D (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 3 TC 1 Z9 1 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3309 EP 3311 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801077 ER PT B AU Barale, P Li, N Osborn, J Tanabe, J Yourd, RB Zisman, MS Sun, Y Xu, X AF Barale, P Li, N Osborn, J Tanabe, J Yourd, RB Zisman, MS Sun, Y Xu, X BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Optimization of the PEP-II low-energy ring dipoles SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The PEP-II Project [1], a collaboration of SLAG, LBNL, and LLNL, began construction in January 1994. Dipoles for the PEP-II Low-Energy Ring (LER) are being fabricated in China in collaboration with the Institute of High Energy Physics (MEP) in Beijing. The LER design calls for short dipoles (l(eff) = 450 mm) with a 63.5 mm gap. As a result, magnetic properties are dominated by end effects and a proper end chamfer must be developed. Magnetic measurements using both integral coil and rotating coil techniques were carried out at LBNL on an early dipole prototype to determine the sensitivity of various allowed multipoles to the end chamfer shape. Dynamic aperture studies were carried out in parallel to explore the sensitivity of the lattice to these multipoles. By interpreting the measurement results in terms of differences from the baseline chamfer, a prescription was developed to "transfer" the results to another prototype dipole more representative of the production magnets. The optimized end chamfer shape was validated with a preproduction dipole and full production is under way. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Barale, P (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3312 EP 3314 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801078 ER PT B AU Humphries, D Schlueter, R AF Humphries, D Schlueter, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Harmonic correction rings for the PEP-II i.r. quadrupole magnets SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Two harmonic corrector ring magnet designs have been developed to correct field error harmonics generated by quadrupole magnets in the interaction region of PEP-II [1]. They consist of circular arrays of cylindrical permanent magnet pairs which can be both arbitrarily oriented and counter-rotated for strength. This arrangement allows the correctors to be tuned to generate a correction field with arbitrarily selected combinations of harmonics. These correctors are designed such that they can be pre-fabricated and then tuned after the quadrupole magnets have been built and their residual harmonic error content ascertained. The correctors can thus be used to cancel any residual combination of error harmonics in the completed quadrupoles. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Humphries, D (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3315 EP 3317 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801079 ER PT B AU Li, N Osborn, J Tanabe, J Yee, D Yourd, R Zisman, MS Cao, Z Hou, R Sun, Y AF Li, N Osborn, J Tanabe, J Yee, D Yourd, R Zisman, MS Cao, Z Hou, R Sun, Y BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Performance of the PEP-II low-energy ring quadrupoles SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Production quantities of quadrupoles for the PEP-II Low-Energy Ring (LER) have been fabricated and measured in China in collaboration with MEP (Beijing). The LER design specification calls for short quadrupoles (L-eff = 430 mm) with a bore radius of 50 mm. End effect corrections, using a chamfer geometry originally developed for the ALS quadrupoles at LBNL, were verified in a prototype magnet prior to release of the design for production of the 320 quadrupoles (including spares) required for the LER. Rotating coil measurements were carried out at IHEP yielding multipole error spectra, magnetic center distribution and transfer function behavior for the full production quantity of magnets. Separate measurements were made to determine the reproducibility of magnets connected together in a series string by measuring the individual magnets against a reference magnet using a bucking magnet. Measurement results of all the magnets indicate that the error multipole spectra satisfy the field quality requirements, reproducibility requirements for magnets in a power supply string are satisfied and the spatial distribution of the magnetic center with respect to the mechanical magnet center falls within a radius which is substantially smaller than the transverse alignment tolerance specified for the quadrupoles. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Li, N (reprint author), Lawrence Berkeley 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 0-7803-4376-X PY 1998 BP 3318 EP 3320 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801080 ER PT B AU Osborn, J Tanabe, J Yee, D Younger, F AF Osborn, J Tanabe, J Yee, D Younger, F BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design of the PEP-II interaction region septum quadrupole SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The PEP-II QF2 magnet is one of the final focus quadrupoles for the Low-Energy Ring (LER) and utilizes a septum aperture to accommodate the adjacent High-Energy Ring (HER) beamline. The LER lattice design specification calls for an extremely high field quality for this magnet. A conventional water-cooled copper coil and laminated steel core design was selected to allow adjustment in the excitation. The close proximity between the LER and HER beamlines and the required integrated quadrupole strength result in a moderately high current density septum design. The QF2 magnets are imbedded in a confined region at each end of the BaBar detector, thus requiring a small magnet core cross section. Pole face windings are included in the QF2 design to buck the skew octupole term induced by the solenoidal fringe field that leaks out of the detector. Back-leg windings are included to buck a small dipole component induced by the lack of perfect quadrupole symmetry in this septum design. 2D pole contour optimization and 3D end chamfers are used to minimize harmonic errors; a separate permanent-magnet Harmonic Corrector Ring compensates for remaining field errors. The design methods and approach, 2D and 3D analyses, and the resulting expected magnet performance are described in this paper. C1 Lawrence Berkeley Lab, Berkeley, CA 94710 USA. RP Osborn, J (reprint author), Lawrence Berkeley Lab, MS 71J,1 Cyclotron Rd, Berkeley, CA 94710 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 0-7803-4376-X PY 1998 BP 3321 EP 3323 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801081 ER PT B AU Sullivan, M Bowden, G Ecklund, S Jensen, D Norby, M Ringwall, A Wolf, Z AF Sullivan, M Bowden, G Ecklund, S Jensen, D Norby, M Ringwall, A Wolf, Z BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Results from a prototype permanent magnet dipole-quadrupole hybrid for the PEP-II B-factory SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We describe the construction of a prototype hybrid permanent magnet dipole and quadrupole. The magnet consists of two concentric rings of Sm2Co17 magnetic material 5 cm in length. The outer ring is made of 16 uniformly magnetized blocks assembled as a Halbach dipole anti the inner ring has 32 blocks oriented in a similar fashion so as to generate a quadrupole field. The resultant superimposed field is an offset quadrupole field which allows us to center the field on the high-energy beam in the interaction region of the PEP-II B-factory. The dipole blocks are glued to the inside surface of an outer support collar and the quadrupole blocks are held in a fixture that allows radial adjustment of the blocks prior to petting the entire assembly with epoxy. An extensive computer model of the magnet has been made and from this model we developed a tuning algorithm that allowed us to greatly reduce the n=3-17 harmonics of the magnet. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94039 USA. RP Sullivan, M (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94039 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 0-7803-4376-X PY 1998 BP 3330 EP 3332 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801084 ER PT B AU Karn, J Biallas, G Guerra, A Harwood, L AF Karn, J Biallas, G Guerra, A Harwood, L BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Magnetic measurements of the prototype dipole for the IR-FEL at the Thomas Jefferson National Accelerator Facility SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Magnetic measurements have been performed on the prototype dipole for the high power IR-FEL presently under construction at the Thomas Jefferson National Accelerator Facility. The optics-driven requirements for these magnets include low fields, large horizontal apertures, tight field homogeneity, absolute setability of core field & integrated field, and control of the horizontal & vertical focusing terms designed into the magnets. A prototype dipole was fabricated and underwent several iterations of mechanical adjustment and magnetic measurement. Measurements were made to quantify the effects of field clamps on vertical focusing terms and effective length. Additional tests were made using various applications of Purcell gaps and high permeability materials in order to achieve the required homogeneity. Results from the prototype have been integrated into the design of the seven families of dipoles needed for the FEL. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Karn, J (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, 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 0-7803-4376-X PY 1998 BP 3333 EP 3335 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801085 ER PT B AU Cozzolino, J Anerella, M Jain, A Louie, W Muratore, J Wanderer, P AF Cozzolino, J Anerella, M Jain, A Louie, W Muratore, J Wanderer, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Removal of axial twist in RHIC insertion quadrupole magnets SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The focusing triplets located on either side of the six interaction points of RHIC each consist of three 13cm aperture quadrupoles with magnetic lengths of 1.44m (Q1), 3.40m (Q2), and 2.10m (Q3). The field quality and alignment of these magnets are critical to the performance of the accelerator. The maximum allowable axial twist of the cold mass, defined as the standard deviation in the quadrupole roll angle, is 0.5 mrad. This requirement has occasionally exceeded the capabilities of the assembly fixturing and the procedures used to complete the axial welding of the shell halves around the cold mass yoke. A corrective shell welding technique has been successfully employed to remove excessive axial twist of the 13cm quadrupoles. This "custom straightening" method is described along with the mechanical inspection data before and after straightening. The magnetic results which confirm the untwisting procedure are also discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Cozzolino, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 1 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3338 EP 3340 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801087 ER PT B AU Fischer, W Okamura, M AF Fischer, W Okamura, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Parameterization and measurements of helical magnetic fields SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Magnetic fields with helical symmetry can be parameterized using multipole coefficients ((a) over tilde(n), (b) over tilde(n)). We present a parameterization that gives the familiar multipole coefficients (a(n), b(n)) for straight magnets when the helical wavelength tends to infinity. To measure helical fields all methods used for straight magnets can be employed. We show how to convert the results of those measurements to obtain the desired helical multipole coefficients ((a) over tilde(n), (b) over tilde(n)). C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fischer, W (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 0-7803-4376-X PY 1998 BP 3341 EP 3343 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801088 ER PT B AU Gupta, R AF Gupta, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A common coil design for high field 2-in-1 accelerator magnets SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A common coil design concept for 2-in-1 superconducting accelerator magnets is presented. It practically eliminates the major problems in the ends of high field magnets built with either high temperature superconductors (HTS) or conventional superconductors. Racetrack coils, consisting of rectangular blocks built with either superconducting tapes or cables, are common to both apertures with each aperture containing one half of each coil. The ends are easy to wind with the conductors experiencing little strain. The overall magnet design, construction and tooling are also expected to be simpler than in the conventional cosine theta magnets. The concept is also suitable for superferric and combined function magnet designs. A modular design for an HTS based R&D magnet is also presented. C1 Brookhaven Natl Lab, RHIC, Upton, NY 11973 USA. RP Gupta, R (reprint author), Brookhaven Natl Lab, RHIC, Upton, NY 11973 USA. NR 2 TC 5 Z9 5 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3344 EP 3346 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801089 ER PT B AU Gupta, R Jain, A Muratore, J Wanderer, P Willen, E Wyss, C AF Gupta, R Jain, A Muratore, J Wanderer, P Willen, E Wyss, C BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Change in field harmonics after quench and thermal cycles in superconducting magnets SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A change in field harmonics after quench and thermal cycles has been observed in superconducting magnets for the Relativistic Heavy Ion Collider (RHIC). This paper presents the results of a systematic investigation of this effect in a number of RHIC dipole and quadrupole magnets. These changes in field harmonics may limit the ultimate field quality and its reproducibility in superconducting magnets. A change in pre-stress has also been observed after quench and thermal cycles. A possible link between these two changes is explored. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Gupta, R (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 3 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3347 EP 3349 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801090 ER PT B AU Kahn, S Wanderer, P AF Kahn, S Wanderer, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Magnetic design of superconducting quadrupoles for a SC linac for APT SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper describes the magnetic design for superconducting quadrupoles to be used in the superconducting option of the proton linac for the Accelerator Production of Tritium (APT) project. The quadrupole magnets provide the focusing for a singlet FODO lattice used in the linac. The magnets have a 16 cm (13 cm) aperture in the hi-beta (medium-beta) section of the linac. The proposed design is a coil dominated magnet with an iron yoke at a larger radius to shield the magnetic field from other parts of the accelerator. The field performance, field quality, peak field and forces on the conductor are discussed. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kahn, S (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 2 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3350 EP 3352 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801091 ER PT B AU Muratore, J Jain, A Ganetis, G Ghosh, A Marone, A Morgillo, A Sampson, W Thompson, P Wanderer, P AF Muratore, J Jain, A Ganetis, G Ghosh, A Marone, A Morgillo, A Sampson, W Thompson, P Wanderer, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Test results from the completed production run of superconducting corrector magnets for RHIC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The production run of all 432 superconducting 8 cm corrector magnets required for the Relativistic Heavy Ion Collider (RHIC) has been completed at Brookhaven National Laboratory (BNL). All have been tested at 4.35 K for quench performance and at room temperature for magnetic field quality. In addition, magnetic field measurements at 4.35 K have been done for a 20% sample of these. Summaries of the harmonic and quench test results are presented. A comparison of the quench performance for magnets made with different coil preload tensions is also shown. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Muratore, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 2 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3353 EP 3355 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801092 ER PT B AU Schmalzle, J Anerella, M Ganetis, G Ghosh, A Gupta, R Jain, A Kahn, S Morgan, G Muratore, J Sampson, W Wanderer, P Willen, E AF Schmalzle, J Anerella, M Ganetis, G Ghosh, A Gupta, R Jain, A Kahn, S Morgan, G Muratore, J Sampson, W Wanderer, P Willen, E BE Comyn, M Craddock, MK Reiser, M Thomson, J TI RHIC D0 insertion dipole design iterations during productions SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Iterations to the cross section of the Relativistic Heavy Ion Collider (RHIC) DO Insertion Dipole magnets were made during the production. This was included as part of the production plan because no R&D or pre-production magnets were built prior to the start of production. The first magnet produced had the desired coil pre-stress and low field harmonics in the body of the magnet and is therefore being used in the RHIC Machine. On the first eight magnets, iterations were carried out to minimize the iron saturation and to compensate for the end harmonics. This paper will discuss the details of the iterations made, the obstacles encountered, and the results obtained. Also included will be a brief summary of the magnet design and performance. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Schmalzle, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3356 EP 3358 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801093 ER PT B AU Syphers, M Courant, E Fischer, W Luccio, A Mariam, F Peggs, S Pilat, F Roser, T Tepikian, S Tsoupas, N Willen, E Katayama, T Hatanaka, K Kawaguchi, T Okamura, M Tominaka, T Wu, H Ptitsin, V Shatunov, Y AF Syphers, M Courant, E Fischer, W Luccio, A Mariam, F Peggs, S Pilat, F Roser, T Tepikian, S Tsoupas, N Willen, E Katayama, T Hatanaka, K Kawaguchi, T Okamura, M Tominaka, T Wu, H Ptitsin, V Shatunov, Y BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Helical dipole magnets for polarized protons in RHIC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Superconducting helical dipole magnets will be used in the Brookhaven Relativistic Heavy Ion Collider (RHIC) to maintain polarization of proton beams and to perform localized spin rotations at the two major experimental detector regions. Requirements for the helical dipole system are discussed, and magnet prototype work is reported. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Syphers, M (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 0-7803-4376-X PY 1998 BP 3359 EP 3361 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801094 ER PT B AU Willen, E Gupta, R Jain, A Kelly, E Morgan, G Muratore, J Thomas, R AF Willen, E Gupta, R Jain, A Kelly, E Morgan, G Muratore, J Thomas, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A helical magnet design for RHIC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Helical dipole magnets are required in a project for the Relativistic Heavy Ion Collider (RHIC) to control and preserve the beam polarization in order to allow the collision of polarized proton beams. Specifications are for low current superconducting magnets with a 100 mm coil aperture and a 4 Tesla field in which the field rotates 360 degrees over a distance of 2.4 meters. A magnet meeting the requirements has been developed that uses a small diameter cable wound into helical grooves machined into a thick-walled aluminum cylinder. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Willen, E (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3362 EP 3364 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801095 ER PT B AU Feher, S Bossert, R DiMarco, J Mitchell, D Lamm, MJ Limon, PJ Mazur, P Nobrega, F Orris, D Ozelis, JP Strait, JB Tompkins, JC Zlobin, AV AF Feher, S Bossert, R DiMarco, J Mitchell, D Lamm, MJ Limon, PJ Mazur, P Nobrega, F Orris, D Ozelis, JP Strait, JB Tompkins, JC Zlobin, AV BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Quench protection of SC quadrupole magnets SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The high gradient quadrupole (HGQ) being developed for the LHC interaction regions by the collaboration of FNAL/LBNL/BNL[1], relies on the use of quench protection heaters. As part of the HGQ R&D program at Fermilab, Tevatron low-beta quadrupoles installed with quench protection heaters were tested in normal and superfluid helium. This paper focuses on heater operation time delay and quench propagation velocity measurements since these are important input parameters for designing the quench protection system of the HGQ. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Feher, S (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3389 EP 3391 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801104 ER PT B AU Foster, GW Mazur, PO Peterson, T Sylvester, CD Schlabach, P AF Foster, GW Mazur, PO Peterson, T Sylvester, CD Schlabach, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design and operation of an experimental "Double-C" transmission line magnet SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The "Double-C" transmission line magnet is a warm-iron warm-bore single turn 2-in-1 superferric magnet designed to provide a significant reduction in magnet costs for future hadron colliders. Construction and first operational tests of a prototype magnet system are described. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Foster, GW (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3392 EP 3394 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801105 ER PT B AU Lamm, MJ DiMarco, J Desavouret, E Feher, S Garvey, JD Hess, C Limon, PJ Nogiec, JM Orris, DF Pachnik, J Peterson, T Sharonov, S Strait, JB Sylvester, C Sim, JW Tartaglia, M Tompkins, JC Zlobin, AV AF Lamm, MJ DiMarco, J Desavouret, E Feher, S Garvey, JD Hess, C Limon, PJ Nogiec, JM Orris, DF Pachnik, J Peterson, T Sharonov, S Strait, JB Sylvester, C Sim, JW Tartaglia, M Tompkins, JC Zlobin, AV BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A new facility to test superconducting accelerator magnets SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Future high energy accelerators such as the Large Hadron Collider require accelerator magnets with the highest possible fields. For NbTi conductor magnets, this means operating at superfluid helium temperatures in the range of 1.8-1.9K. As part of Fermilab's superconducting magnet R&D program, we have built a facility to test magnets in a vertical dewar of superfluid liquid helium. The dewar is designed for magnets up to 4 m length and 620 mm diameter, with a temperature range of 1.8 K to 4.4 K and 1 atmosphere helium. The power system consists of 10 kA and 8.8 kA power supplies operating in parallel, with bus work and an extraction circuit that can accommodate up a 18kA excitation current. A description of the facility as well as operational experience from the first magnet tests are presented. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Lamm, MJ (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3395 EP 3397 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801106 ER PT B AU Sabbi, G Gourlay, SA Kerby, J Lamm, MJ Limon, PJ Nobrega, F Novitski, I Strait, JB Zlobin, AV Caspi, S Scanlan, R Ghosh, A Gupta, R AF Sabbi, G Gourlay, SA Kerby, J Lamm, MJ Limon, PJ Nobrega, F Novitski, I Strait, JB Zlobin, AV Caspi, S Scanlan, R Ghosh, A Gupta, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Magnetic design of a high gradient quadrupole for the LHc low-beta insertions SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Fermilab, Lawrence Berkeley National Laboratory and Brookhaven National Laboratory have formed a consortium to provide components for the Large Hadron Collider (LHC) to be built at CERN. The U.S. contribution includes half of the high gradient quadrupoles (HGQ) for the inner focusing triplets. In this paper a description of the HGQ magnetic design is given, including short sample limit for field gradient, sources and expected values of systematic and random field errors, and possible strategies for held quality correction. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Sabbi, G (reprint author), Fermi Natl Accelerator Lab, POB 500,MS 316, 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 0-7803-4376-X PY 1998 BP 3398 EP 3400 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801107 ER PT B AU Green, MA Palmer, RB AF Green, MA Palmer, RB BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A mu mu collider capture solenoid system for pions from a tilted target SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In order to generate muon beams for a muon Collider, pions produced in a target must be captured before they can go through phase rotation and decay into muons. A 20 T solenoid with a clear bore of 150 mm can capture particles with a transverse momentum of 225 MeV/c or less. As captured particles leave the capture solenoid, the induction is decreased to 5 T while the beam pipe diameter increases to 300 mm. Phase rotation and decay of the pions will occur at 5 T. The capture solenoid and the solenoids just downstream from the capture solenoid are subject to high heat loads (up to 2.4 MW). The conventional inner solenoid of the 20 T hybrid magnet system and the water cooled absorber will absorb most of the beam power from the protons thus protecting the superconducting solenoid system from heating. Tilting the target and the incoming beam about 150 milliradians with respect to the solenoid axis appears to increase the net pion capture by about sixty percent. This paper describes approaches for capturing muons from a tilted target while getting rid of the spent proton beam. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Green, MA (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3401 EP 3403 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801108 ER PT B AU Bruno, D Soukas, A Toldo, F Lambiase, RF AF Bruno, D Soukas, A Toldo, F Lambiase, RF BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Overview of the ATR power supplies SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The AGS to RHIC transfer Line (ATR) transports a variety of beams from the Alternating Gradient Synchrotron (AGS) which gets its input from the Booster Synchrotron. In turn, the Booster receives input beams from either a Tandem Van de Graaff (heavy ions) or a Linac (protons). The AGS extracts beam bunches, up to a rate of 30 Hertz, to the ATR which feeds the Relativistic Heavy Ion Collider (RHIC) starting with the sextant test in January of 1997. The ATR is made up of the upgraded U line and the new W, X and Y lines. A test in 1995 transported beam to the end of the W line. During normal operation, a pursed switching magnet at the end of the W line will bend the beam into the X line or the Y line so that the two storage rings in RHIC are filled with counter rotating beams. The ATR line is comprised of 80 power supplies (PS's), 17 of which are upgraded AGS PS's. The remaining 63 PS's were newly purchased. These PS's range from bipolar 600 watt linear type trim magnet PS's to 1 Megawatt, thyristor, dipole PS's. Results of the commissioning runs will be presented, as well as descriptions of regulation, filtering, and analog and digital controls. C1 Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA. RP Bruno, D (reprint author), Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA. RI Lambiase, Robert/E-1934-2013 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 0-7803-4376-X PY 1998 BP 3449 EP 3451 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801124 ER PT B AU Schultheiss, C Bruno, D Feng, PK Haque, T Lambiase, RF AF Schultheiss, C Bruno, D Feng, PK Haque, T Lambiase, RF BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Power systems for the RHIC first sextant test SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The first sextant test of the RHIC project is an opportunity to evaluate the many systems that must work together for the accelerator to operate. For the main dipole string, the actual main quadrupole power supply with its DSP regulator and output circuit compartment will be used. Temporary supplies will be used for the main quadrupole string, quadrupole offset, and quadrupole shunt supplies. This will let us both measure the performance of the main supply as well as determine the interaction among other power elements in the circuit. Correction elements will also be powered. The actual gamma-T power supplies will be used, as well as temporary supplies for the dipole correctors and sextupole supplies. Some of these units are required for beam to be transported, others are to be operated without beam to measure their performance, and how they interact with their superconducting loads. The power supply equipment, and that of other systems, required an infrastucture of AC power and output cable distribution in the RHIC tunnel, outlying service buildings, and interconnecting the tunnel to the service buildings. This note will describe the performance of the RHIC power supply systems during the sextant test, and the experience gained from this exercise. C1 Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA. RP Schultheiss, C (reprint author), Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA. RI Lambiase, Robert/E-1934-2013 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 0-7803-4376-X PY 1998 BP 3452 EP 3454 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801125 ER PT B AU Bartelson, L Krafczyk, G Pfeffer, H Wolff, D AF Bartelson, L Krafczyk, G Pfeffer, H Wolff, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Four quadrant DC to DC switching supply for the Fermilab Main Injector SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Fermilab Main Injector (FMI) will require 248 ramped corrector power supplies for the operation of the accelerator. The design and prototype test results will be described in this paper. The 3 main design goals for these supplies are: 1) eliminate failure due to thermal fatigue that has plagued similar systems at FNAL, 2) utilize PWM technology to attain good efficiency and small size, and 3) minimize conducted and radiated noise typically generated by PWM systems. The power supplies operate at 30kHz switching frequency and are rated for +/-150 Volts and +/-15 Amps at 95 percent switching duty cycle and 95 percent efficiency into a 1 Henry magnet load. The FMI requirements call for a ramp cycle of I - 2 seconds. During the cycle, the maximum temperature swing, junction to heat sink, of the power components is less than 30 degrees centigrade. The output voltage ripple is less than 1 Volt RMS. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Bartelson, L (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3461 EP 3463 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801128 ER PT B AU Sharonov, S Nogiec, JM AF Sharonov, S Nogiec, JM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An embedded power supply controller SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Several different models of high current power supplies are used to test accelerator magnets at the Fermilab's Development and Test Department (D&TD). Department-wide standardization of current control and monitoring has been achieved by embedding a proprietary intelligent device into each of these power supplies. The device is based on a highly integrated Intel 87C196 microcontroller that is used to control and monitor current, collect status information, issue control signals and communicate with a host computer. The controller interfaces with a power supply via onboard high precision ADC and DAC converters, and digital I/O registers. Some of the advanced features of the system include: downloading and interpreting of complex ramp profiles, built-in parabolic waveform approximation, external triggering, and fiber-optic communication media Network access is enabled by an extensive set of UNIX tools such as GUI, ramp profile simulator, API library, and shell programming tools. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Sharonov, S (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3464 EP 3466 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801129 ER PT B AU Friedrichs, C Lyles, J Doub, JM AF Friedrichs, C Lyles, J Doub, JM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Development of a high speed crowbar for LANSCE SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Each of the four 200 MHz Final Power Amplifiers (FPAs) in the LANSCE proton linac has its own capacitor bank and crowbar. The dissipation in the 10 Omega crowbar limiting resistor is as high as 67 kW, and oil cooling is used. Our stated upgrade goal was to substantially reduce the limiting resistor dissipation and eliminate the oil cooling. Early tests showed that the fault energy quickly rose to unacceptable levels as the current limiting resistance was reduced. FPA arcs are normally quenched by interrupting the FPA modulator current, and the crowbar waits 10 mu s for this to occur. The successful upgrade strategy was to replace the 10 Omega resistor with a 3 Omega air cooled resistor and to add a high speed crowbar circuit which operates only if there are simultaneous arcs in the FPA and its modulator. This paper describes the high speed circuit and its interface with the existing crowbar. Test results are also given. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Friedrichs, C (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3473 EP 3475 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801132 ER PT B AU Cassel, R Nguyen, MN AF Cassel, R Nguyen, MN BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A unique power supply for the PEPII klystron at SLAC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Each of the eight 1.2 MW RF klystrons for the PEP-II storage rings require a 2.5 MVA DC power supply of 83 Ky at 23 amps. The design for the supply was base on three factors low cost, small size to fit existing substation pads, and good protection against damage to the klystron including klystron gun arcs. The supply uses a 12 pulse 12.5 KV primary thyristor "star point controller" with primary filter inductor to provide rapid voltage control, good voltage regulation, and fast turn off during klystron tube faults. The supply also uses a unique secondary rectifier, filter capacitor configuration to minimize the energy available under a klystron fault. The voltage control is from 0-90 KV with a regulation of <0.1% and voltage ripple of < 1% P-P, (< 0.2% RMS.) above 60 KV. The supply utilizes a thyristor crowbar, which under a klystron tube are limits the energy in the klystron are to < 5 joules. If the thyristor crowbar is disabled the energy supplied is < 40 joules into the are. The size of the supply was reduced small enough to fit the existing PEP transformer yard pads. The cost of the power supply was < $140 per KVA. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94305 USA. RP Cassel, R (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94305 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 0-7803-4376-X PY 1998 BP 3482 EP 3484 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801135 ER PT B AU Olsen, R AF Olsen, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI PEP II 16-channel corrector controller using BITBUS SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A 16-channel controller has been implemented to control the PEP II corrector switching power converters. The design and performance are discussed. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Olsen, R (reprint author), Stanford Linear Accelerator Ctr, POB 4349, Stanford, CA 94309 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3485 EP 3487 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801136 ER PT B AU Nassiri, A Turner, LR AF Nassiri, A Turner, LR BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An electromagnetic micro-undulator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Microfabrication technology using the LIGA (a German acronym for Lithography, Electroforming, and Molding) process offers an attractive alternative for fabricating precision devices with micron-sized features. One such device is a mm-sized micro-undulator with potential applications in a table-top synchrotron light source for medical and other industrial uses. The undulator consists of a silver conductor embedded in poles and substrate of nickel-iron. Electromagnetic modeling of the undulator is done using the eddy-current computer code ELEKTRA. Computations predict a field pattern of appropriate strength and quality if the current can be prevented from being shunted from silver by the nickel-iron poles either through insulation or through slotted poles. The design of the undulator along with the computational results are discussed. C1 Adv Photon Source, Argonne, IL 60439 USA. RP Nassiri, A (reprint author), Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 3491 EP 3493 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801138 ER PT B AU Blum, EB Lynch, DR Mortazavi, P Singh, OV Thomlinson, W Woodle, MH Broadbent, AJ Coates, MC Milward, SR Moore, EJF Smith, KD AF Blum, EB Lynch, DR Mortazavi, P Singh, OV Thomlinson, W Woodle, MH Broadbent, AJ Coates, MC Milward, SR Moore, EJF Smith, KD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A superconducting wiggler magnet for the NSLS X-ray ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID SYNCHROTRON AB The superconducting 5 pole, 5 Tesla wiggler which has been operating in the X-17 straight section of the x-ray storage ring at the National Synchrotron Light Source (NSLS) since 1989 will soon be replaced by a new wiggler being built by Oxford Instruments with lower operating costs, higher reliability, and greater performance. The new wiggler has three modes of operation: the full wiggler with Il poles producing 3.0 T, the partial wiggler with 5 poles at 4.7 T, and the wavelength shifter with a single pole producing 5.5 T. The full wiggler, optimized for the digital subtraction radiography program, will produce the same x-ray flux at the 33 KeV iodine K-edge as the existing wiggler operating at 4.7 T but will reduce the higher energy harmonics delivered to the target. The partial wiggler will deliver the same flux for solid state physics experiments as the existing wiggler, and the wavelength shifter will provide an elliptically polarized x-ray beam that is not now available. C1 Brookhaven Natl Lab, Upton, NY 11764 USA. RP Blum, EB (reprint author), Brookhaven Natl Lab, Upton, NY 11764 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 0-7803-4376-X PY 1998 BP 3494 EP 3496 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801139 ER PT B AU Rakowsky, G Aspenleiter, JJ Graves, WS Solomon, L Stefan, PM AF Rakowsky, G Aspenleiter, JJ Graves, WS Solomon, L Stefan, PM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Magnetic measurements on an in-vacuum undulator for the NSLS X-ray Ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID WIGGLERS AB Magnetic measurements have been performed on the In-Vacuum Undulator (IVUN), built jointly by BNL and SPring-8 for the NSLS X-Ray Ring. The IVUN magnet has a Halbach-type, pure-permanent magnet structure with a period of 11 mm and a minimum gap of 2 mm. Results of magnetic measurements utilizing Hall probe, moving wire and pulsed wire techniques will be presented and compared. C1 NSLS, Brookhaven Natl Lab, Upton, NY 11973 USA. RP Rakowsky, G (reprint author), NSLS, Brookhaven Natl Lab, POB 5000, 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 0-7803-4376-X PY 1998 BP 3497 EP 3499 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801140 ER PT B AU Tatchyn, R AF Tatchyn, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design features of a planar hybrid/permanent magnet strong-focusing undulator for Free Electron Laser (FEL) and synchrotron radiation (SR) applications SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Insertion devices for Angstrom-wavelength Free Electron Laser (FEL) amplifiers driven by multi-GeV electron beams generally require distributed focusing substantially stronger than their own natural focusing fields. Over the last several years a wide variety of focusing schemes and configurations have been proposed for undulators of this class, ranging from conventional current-driven quadrupoles external to the undulator magnets to permanent magnet (PM) lattices inserted into the insertion device gap. In this paper we present design studies of a flexible high-field hybrid/PM undulator with strong superimposed planar PM focusing proposed for a 1.5 Angstrom Linac Coherent Light Source (LCLS) driven by an electron beam with a I mm-mr normalized emittance. Attainable field parameters, tuning modes, and potential applications of the proposed structure are discussed. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 USA. RP Tatchyn, R (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford Synchrotron Radiat Lab, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 3530 EP 3532 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801151 ER PT B AU Noonan, JR Gagliano, J Goeppner, GA Rosenberg, RA Walters, DR AF Noonan, JR Gagliano, J Goeppner, GA Rosenberg, RA Walters, DR BE Comyn, M Craddock, MK Reiser, M Thomson, J TI APS storage ring vacuum system performance SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Advanced Photon Source (APS) storage ring was designed to operated with 7-GeV, 100-mA positron beam with lifetimes > 20 hours. The lifetime is limited by residual gas scattering and Touschek scattering at this time. Photon-stimulated desorption and microwave power in the rf cavities are the main gas loads. Comparison of actual system gas loads and design calculations will be given. In addition, several special features of the storage ring vacuum system will be presented. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Noonan, JR (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 3552 EP 3555 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801157 ER PT B AU Den Hartog, PK Grimmer, J Trakhtenberg, E Wiemerslage, G Xu, S AF Den Hartog, PK Grimmer, J Trakhtenberg, E Wiemerslage, G Xu, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Advanced Photon Source experience with vacuum chambers for insertion devices SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB During the last five years, a new approach to the design and fabrication of extruded aluminum vacuum chambers for insertion devices was developed at the Advanced Photon Source (APS). With this approach, three different versions of the vacuum chamber, with vertical apertures of 12 mm, 8 mm, and 5 mm, were manufactured and tested. Twenty chambers were installed in the storage ring and successfully integrated into the APS vacuum system. All have operated with beam, and 16 have been coupled with insertion devices. Two different vacuum chambers with vertical apertures of 16 mm and 11 mm were developed for the BESSY-II storage ring and 3 of the 16 mm chambers were manufactured. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Den Hartog, PK (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 0-7803-4376-X PY 1998 BP 3556 EP 3558 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801158 ER PT B AU Bertolini, L Alford, O Duffy, P Holmes, R Mullins, L Ng, C Sullivan, M AF Bertolini, L Alford, O Duffy, P Holmes, R Mullins, L Ng, C Sullivan, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Interaction region vacuum system design at the PEP-II B factory SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Interaction Region Vacuum System in the PEP-II B-Factory at SLAG must produce average pressures in the 10(-10) Torr range. Low beamline pressures will minimize the background radiation encountered by the BaBar Detector. A combination of copper and stainless steel vacuum chambers with continuous antechambers are used to make up the beam tubes. Linear Non-Evaporable Getter (NEG) pumps are used to produce distributed pumping along the length of these beam tubes. High conductance "microwave" type screens provide RF shields between the beam aperture and the NEG pumps. In this paper the design features of the beam tubes, NEG pumps, and RF pump screens are described and the vacuum and impedance analyses conducted in support of the design are discussed. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Bertolini, L (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3562 EP 3564 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801160 ER PT B AU Mahoney, K AF Mahoney, K BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Survey of electronic safety systems in accelerator applications SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper presents the preliminary results and analysis of a comprehensive survey of the implementation of accelerator safety interlock systems from over 30 international labs. At the present time there is not a self consistent means to evaluate both the experiences and level of protection provided by electronic safety interlock systems. This research is intended to analyze the strength and weaknesses of several different types of interlock system implementation methodologies. Research, medical, and industrial accelerators are compared. Thomas Jefferson National Accelerator Facility (TJNAF) was one of the first large particle accelerators to implement a safety interlock system using programmable logic controllers. Since that time all of the major new U.S. accelerator construction projects plan to use some form of programmable electronics as part of a safety interlock system in some capacity. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Mahoney, K (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3565 EP 3567 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801161 ER PT B AU Kennedy, K Harteneck, B Millos, G Benapfl, M King, F Kirby, R AF Kennedy, K Harteneck, B Millos, G Benapfl, M King, F Kirby, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI TiN coating of the PEP-II Low-Energy Ring aluminum arc vacuum chambers SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The PEP-II Low-Energy Ring will operate at a nominal energy of 3.1 GeV with a positron beam current of 2.1 A. Design parameters for vacuum components are 3.5 GeV at 3 A. The are vacuum system is based on an aluminum antechamber concept. It consists of 192 pairs of 2 m long magnet chambers and 5.5 m long pumping chambers. Titanium nitride coating of the entire positron duct is needed in order to suppress beam instabilities caused by multipactoring and the "electron-cloud" effect. An extensive R&D program has been conducted to develop coating parameters that give proper stoichiometry and a suitable thickness of TiN. The total secondary emission yield of TiN-coated aluminum coupons has been measured after the samples were exposed to air and again after electron-beam bombardment. A coating facility has been built to cope with the large quantity of production chambers and the very tight schedule requirements. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Kennedy, K (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 4 TC 2 Z9 2 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3568 EP 3570 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801162 ER PT B AU Sheng, IC Yang, BX Sharma, S AF Sheng, IC Yang, BX Sharma, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design and analysis of a Be window for the APS diagnostics undulator beamline SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The design of a beryllium (Be) window for use under the extremely high heat load of an undulator beam is one of the challenges for third-generation synchrotron radiation beamlines. A novel design of a Be window is presented for the Advanced Photon Source (APS) diagnostics undulator beamline, whose beam has a peak power density of 150 W/mm(2) (7 GeV/100 mA stored beam). The window has a double concave profile with a thickness of 0.5 mm at the center and is brazed to a water-cooled oxygen-free, high-conductivity (OFHC) copper manifold. Finite-element thermal analysis of the Be window is also presented. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Sheng, IC (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 0-7803-4376-X PY 1998 BP 3574 EP 3576 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801164 ER PT B AU Doose, C Harkay, K Kim, S Milton, S AF Doose, C Harkay, K Kim, S Milton, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI In situ measurement of ceramic vacuum chamber conductive coating quality SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A method for measuring the relative surface resistivity and quality of conductive coatings on ceramic vacuum chambers was developed. This method is unique in that it allows one to test the coating even after the ceramic chamber is installed in the accelerator and under vacuum; furthermore, the measurement provides a localized surface reading of the coating conductance. The method uses a magnetic probe of wire wound on a ferrite and an LCR meter. The probe is calibrated using the measured DC end-to-end resistance of the tube under test and by comparison to a high quality test surface. The measurement method has also been verified by comparison to high frequency impedance measurements. A detailed description, results, and sensitivity of the technique are given here. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Doose, C (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3577 EP 3579 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801165 ER PT B AU Walters, D Noonan, J Gagliano, J Harris, G Svirtun, V AF Walters, D Noonan, J Gagliano, J Harris, G Svirtun, V BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An ancillary pumping system for the APS vacuum system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An ancillary pumping system has been designed and installed in the Advanced Photon Source (APS) storage ring. This vacuum system has the ability to pump sectors of the storage ring down from room pressure to ultra-high vacuum (UHV). The ancillary system is a "dry" system that uses a combination of turbomolecular pumps and oil-free roughing pumps. The benefits of this system are the reduction of equipment needed for in-tunnel maintenance, essential for the operation of a UHV storage ring; rapid response to vacuum emergencies; and a guard to accidental exposures to hydrocarbon contamination. The operational logic and the pump interlock and controls are described. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Walters, D (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 3580 EP 3582 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801166 ER PT B AU Leonhardt, WJ Cullen, JR Gill, PF AF Leonhardt, WJ Cullen, JR Gill, PF BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Stress rupture considerations in the design of large aperture, low mass composite vacuum windows SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Large vacuum vessels are often employed in High Energy and Nuclear Physics experiments to provide a volume for particle traverse in the absence of air molecules. The ends of these vessels generally have a large aperture which is closed with a thin membrane known as a vacuum window. To minimize the vacuum window mass, composites of Kevlar and Mylar have been used in window construction. Historically, these windows have been designed based on the ultimate tensile strength of the materials, however, following the costly failure of a 193 cm x 86 cm window, other design methods emerged. This paper reviews the history of window design and describes the window failure and possible causes. It further presents the phenomenon of stress rupture and describes the analytical and experimental work carried out to improve composite window design methods. C1 Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA. RP Leonhardt, WJ (reprint author), Assoc Univ Inc, 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 0-7803-4376-X PY 1998 BP 3583 EP 3585 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801167 ER PT B AU Leibfritz, JR AF Leibfritz, JR BE Comyn, M Craddock, MK Reiser, M Thomson, J TI FNAL main injector gamma(t)-jump system beamtube design SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The design of the FNAL Main Injector yt-jump system calls for a special beamtube that is to be placed inside the pulsed magnets. The requirements for this beamtube include: an elliptical shaped tube that mates with the existing vacuum system, high electrical resistivity for reducing the eddy current effects, high strength for withstanding the vacuum load, and a design that facilitates simple fabrication and installation. Inconel 718 was selected to meet these criteria. Results obtained from analytical calculations, 2-D and 3-D finite element modeling, and testing of prototypes were in general agreement. The design process, analysis results, and final specifications are discussed. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Leibfritz, JR (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3601 EP 3603 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801173 ER PT B AU Cheng, D Hunt, D Hsieh, H Meneghetti, J Kennedy, K Stevens, T Jones, G Miller, T Colomb, D Bertolini, L Belser, C Kerns, J AF Cheng, D Hunt, D Hsieh, H Meneghetti, J Kennedy, K Stevens, T Jones, G Miller, T Colomb, D Bertolini, L Belser, C Kerns, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Status of the PEP-II low-energy ring vacuum system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The PEP-II B Factory* Low-Energy Ring (LER) will operate at 3.1 GeV with 2.1 A; design specifications are based on 3.5 GeV at 3 A. The vacuum system, 2200 m long, consists of 6 arcs and 6 straights. The are vacuum system is based on an aluminum antechamber pumped by titanium sublimators located directly under discrete photon stops, supplemented by IIO l/s ion pumps near the end of each dipole. The straight sections serve various utility functions, including emittance control with a wiggler, injection, and an interaction region (IR). Vacuum chambers in most of the straight sections are circular stainless steel pipe with external copper plating to facilitate heat transfer to cooling tubes brazed to the outside wall. The wiggler chicane vacuum system uses both aluminum and stainless steel technology, along with a 24 m long distributed copper photon dump. The IR vacuum system is mainly based on copper extrusions. LER vacuum system components are either in the late stage of prototyping or already in full production. C1 Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Cheng, D (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 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 0-7803-4376-X PY 1998 BP 3619 EP 3621 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801179 ER PT B AU Bertolini, L Behne, D Bowman, J Hathaway, D Kishiyama, K Mugge, M Swan, T AF Bertolini, L Behne, D Bowman, J Hathaway, D Kishiyama, K Mugge, M Swan, T BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design of the linear non-evaporable getter pump for the PEP-II B factory SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB There are several regions in the PEP-II B Factory at SLAG that require distributed pumping to deal with large photo-desorbed gas loads or to produce very low pressures(<10(-9) Torr). These regions include the Low Energy Ring Wiggler dump chambers, the transitions between the High Energy Ring arcs and straight sections, and most importantly the Interaction Region, We have designed a compact Non-Evaporable Getter pump using commercial getters that combines high pumping speed and high sorption capacity. We describe the design features of the NEG pumps, and our test results from prototype pumps. In addition, we discuss future variations of this style of NEG pump. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Bertolini, L (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 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 0-7803-4376-X PY 1998 BP 3622 EP 3624 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801180 ER PT B AU Shen, S Kishiyama, K Parker, JM Wilson, NG Schrage, D AF Shen, S Kishiyama, K Parker, JM Wilson, NG Schrage, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI APT/LEDA RFQ vacuum pumping system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper describes the design and fabrication of a vacuum pumping system for the APT/LEDA (Low Energy Demonstration Accelerator) RFQ (Radio Frequency Quadrupole) linac [1]. Resulted from the lost proton beam, gas streaming from the LEBT (Low Energy Beam Transport) and out-gassing from the surfaces of the RFQ cavity and vacuum plumbing, the total gas load will be on the order of 7.2 x 10(-4) Torr-liters/sec, consisting mainly of hydrogen. The system is designed to pump on a continual basis with redundancy to ensure that the minimal "operating vacuum level" of 1 x 10(-6) Torr is maintained even under abnormal conditions. Details of the design, performance analysis and the preliminary test results of the cryogenic pumps are presented. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Shen, S (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 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 0-7803-4376-X PY 1998 BP 3625 EP 3627 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801181 ER PT B AU Kurita, NR Kulikov, A Nordby, M Corlett, J AF Kurita, NR Kulikov, A Nordby, M Corlett, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Final design and manufacturing of the PEP-II High Energy Ring arc bellows module SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An update on the Are bellows module for the PEP-II High Energy Ring is presented. Final design, manufacturing issues, material and coating selection, and tribological and RF testing are discussed Performance and operational requirements are also reviewed. The RF shield design has been proven during assembly to allow for large manufacturing tolerances without reducing the mechanical spring force below required values. In addition, the RF shield maintains electrical contact even with large misalignments across the module. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Kurita, NR (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3639 EP 3641 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801186 ER PT B AU Trbojevic, D Jain, A Tepikian, S Grandinetti, R Ganetis, G Wei, J Karl, F AF Trbojevic, D Jain, A Tepikian, S Grandinetti, R Ganetis, G Wei, J Karl, F BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Alignment of the high beta magnets in the RHIC interaction regions SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The betatron functions inside the triplet quadrupoles in the Relativistic Heavy Ion Collider-RHIC are of the order of 1500 m, necessitating additional attention in the alignment procedure. On each side of the interaction regions eight cryogenic elements (six quadrupoles and two horizontal bending dipoles) are placed inside large cryostats. The quadrupole magnetic centers are obtained by "antenna" measurements with an accuracy of +/- 60 mu m. The signals from the "antenna" were cross calibrated with the colloidal cell measurements of the same magnet. The positions of the fiducials are related to the magnet centers during the "antenna" measurements. Elements are positioned warm inside the cryostats, with offsets to account for shrinkage during the cool down. The supports at the middle of the two central quadrupoles are fixed, while every other element slides longitudinally inside the cryostat during cool down or warm up. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Trbojevic, D (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3651 EP 3653 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801190 ER PT B AU Pietryka, M Gaydosh, M AF Pietryka, M Gaydosh, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Survey and alignment of SLAC's B-factory SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The survey and alignment of SLAC's B-factory injector and high energy ring will be complete in March 1997. Modern digital electronic surveying tools are contributing to new, efficient alignment procedures. A laser tracker was used to fiducialize almost 300 quadrupole magnets. Digital levels were used to pre-set base plate elevations. Theodolites with very accurate co-axial distance meters were used for everything from layout to 3D magnet positioning to network surveys, all in free stationing made. A number of procedures and measurement results are outlined. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Pietryka, M (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3666 EP 3668 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801195 ER PT B AU Forrestal, J Hogrefe, R Knott, M McDowell, W Reigle, D Solita, L Koldenhoven, R Haid, D AF Forrestal, J Hogrefe, R Knott, M McDowell, W Reigle, D Solita, L Koldenhoven, R Haid, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Access Control and Interlock System at the Advanced Photon Source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Advanced Photon Source (APS) consists of a linac, position accumulator ring (PAR), booster synchrotron, storage ring, and up to 70 experimental beamlines. The Access Control and Interlock System (ACIS) utilizes redundant programmable logic controllers (PLCs) and a third hard-wired chain to protect personnel from prompt radiation generated by the linac, PAR, synchrotron, and storage ring. This paper describes the ACIS's design philosophy, configuration, hardware, functionality, validation requirements, and operational experience. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Forrestal, J (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 3669 EP 3671 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801196 ER PT B AU Bhat, CM Mokhov, NV AF Bhat, CM Mokhov, NV BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Radiation levels around the Fermilab Main Injector extraction septa SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Fermilab Main Injector extraction system will be capable of delivering a uniform 120 GeV beam of similar to 3 x 10(13) protons per spill to the fixed target experiments ( with spill time of 1 sec). Up to 2% of the beam is expected to be lost at the extraction septum and the Lambertson magnet. As a result, one expects increased radiation levels around the septa compared to other parts of the Main Injector. Realistic Monte-Carlo simulations have been performed to estimate the instantaneous and residual radiation levels in the beam extraction region. The results of these studies are presented and implications are discussed. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Bhat, CM (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3672 EP 3674 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801197 ER PT B AU Lavine, TL Vylet, V AF Lavine, TL Vylet, V BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Radiation protection in the NLC Test Accelerator at SLAC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This report describes the ionizing radiation protection and safety issues in the design of the Next Linear Collider Test Accelerator (NLCTA), a high-gradient, 1-GeV, X-band linac at SLAG. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Lavine, TL (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3675 EP 3677 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801198 ER PT B AU Cinnamon, J Mahoney, K AF Cinnamon, J Mahoney, K BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Modular reliability modeling of the TJNAF Personnel Safety System SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A reliability model for the Thomas Jefferson National Accelerator Facility (formerly CEBAF) personnel safety system has been developed. The model, which was implemented using an Excel spreadsheet, allows simulation of all or parts of the system. Modularity of the model's implementation allows rapid "what if" case studies to simulate change in safety system parameters such as redundancy, diversity, and failure rates, particular emphasis is given to the prediction of failure modes which would result in the failure of both of the redundant safety interlock systems. In addition to the calculation of the predicted reliability of the safety system, the model also calculates availability of the same system. Such calculations allow the user to make tradeoff studies between reliability and availability, and to target resources to improving those parts of the system which would most benefit from redesign or upgrade. The model includes calculated, manufacturer's data, and Jefferson Lab field data. This paper describes the model, methods used, and comparison of calculated to actual data for the Jefferson Lab personnel safety system. Examples are given to illustrate the model's utility and ease of use. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Cinnamon, J (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 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 0-7803-4376-X PY 1998 BP 3678 EP 3680 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801199 ER PT B AU Mahoney, K Garza, O Stitts, E Areti, H O'Sullivan, M AF Mahoney, K Garza, O Stitts, E Areti, H O'Sullivan, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Jefferson Lab personnel safety fast beam kicker system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The CEBAF accelerator at Thomas Jefferson National Accelerator Facility (Jefferson Lab) uses a continuous electron beam with up to 800 kilowatts of average beam power. The laboratory beam containment policy requires that in the event of an errant beam striking a beam blocking device, the beam must be shut off by three methods in less than 1 millisecond. One method implemented is to shut off the beam at the gun. Two additional methods have been developed which use fast beam kickers to deflect the injector beam on to a water cooled aperture. The kickers designed and implemented at Jefferson Lab are able to deflect the injector beam in less than 200 microseconds. The kicker system includes self-test and monitoring capabilities that enable the system to be used for personnel safety. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Mahoney, K (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3681 EP 3683 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801200 ER PT B AU Mahoney, KL Robertson, HP AF Mahoney, KL Robertson, HP BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Emerging standards with application to accelerator safety systems SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper addresses international standards which can be applied to the requirements for accelerator personnel safety systems. Particular emphasis is given to standards which specify requirements for safety interlock systems which employ programmable electronic subsystems. The work draws on methodologies currently under development for the medical, process control, and nuclear industries. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Mahoney, KL (reprint author), Thomas Jefferson Natl Accelerator Facil, 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 0-7803-4376-X PY 1998 BP 3684 EP 3686 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801201 ER PT B AU Horan, D Kang, Y AF Horan, D Kang, Y BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design and construction of a 1-MW, 352-MHz rf test load SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A 1-MW, 352-MHz rf load was built at Argonne National Laboratory for performance testing the klystrons used as final amplifiers at the Advanced Photon Source (APS). The load utilizes four CERN-type 300-kilowatt coaxial water loads which sue fed from a single WR2300 waveguide using a four-way power splitter consisting of a WR2300 hybrid-T junction and two WR2300 waveguide-to-dual-6-1/8" coaxial transitions. The load system is cooled using deionized water at a nominal flow rate of 160 GPM. The entire load system is mounted on a wheeled carriage which allows for rapid relocation to specific areas of the APS klystron gallery. The metering and interlock system will be described. The load has logged approximately 250 hours of use and has demonstrated accuracy in flow and temperature measurement sufficient to allow calorimetric rf power measurement. 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. 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 0-7803-4376-X PY 1998 BP 3687 EP 3689 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801202 ER PT B AU Horan, D Solita, L Reigle, D Dimonte, N AF Horan, D Solita, L Reigle, D Dimonte, N BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design and construction of the advanced photon source 352-MHz rf system switching control SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A switching control system has been designed and built to provide the capability of rapidly switching the waveguide and low-level cabling between different klystrons to operate the Advanced Photon Source storage ring in the event of a failure of a klystron system or to perform necessary repairs and preventative maintenance. The twelve possible modes of operation allow for complete redundancy of the booster synchrotron rf system and either a maximum of two storage ring rf systems to be completely off-line or one system to be used as a power source for an rf test stand. A programmable controller is used to send commands to intermediate control panels which interface to WR2300 waveguide switches and phase shifters, rf cavity interlock and low-level rf distribution systems, and klystron power supply controls for rapid reconfiguration of the rf systems in response to a mode-selection command. Mode selection is a local manual operation using a keyswitch arrangement which prevents more than one mode from being selected at a time. The programmable controller also monitors for hardware malfunction and guards against "hot-switching" of the rf systems. The rf switching control system is monitored via the Experimental Physics and Industrial Control System (EPICS) [1] for remote system status check. 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. 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 0-7803-4376-X PY 1998 BP 3690 EP 3692 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801203 ER PT B AU Alforque, R Cammarata, J DeVito, B Karl, F Muller, T Kane, S McIntyre, G Savino, R Sondericker, J AF Alforque, R Cammarata, J DeVito, B Karl, F Muller, T Kane, S McIntyre, G Savino, R Sondericker, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Supports and installation system of the RHIC superconducting magnets SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Relativistic Heavy-Ion Collider that is currently under construction at Brookhaven National Laboratory is composed of hundreds of superconducting magnets. A careful study was done in order to support and install these magnets inside the RHIC tunnel systematically and efficiently. A basic systems-approach was pursued and primary consideration was given to develop a system that would not be only both economical and efficient but also well-suited to a fast-paced production environment. This report will present a description of the design of the magnet stands and the magnet transport and installation system, the procurement and fabrication phase, and then finally, the experience gained in implementing the system. In summary, the system turned out to be very efficient and cost-effective far beyond our expectations. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Alforque, R (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 0-7803-4376-X PY 1998 BP 3693 EP 3695 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801204 ER PT B AU Nicol, TH Knauf, AB AF Nicol, TH Knauf, AB BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Permanent magnet assembly tooling for the 8 GeV transfer line and recycler ring at Fermilab SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Magnets for the beam transfer line between the Fermilab Booster and Main Injector and the Recycler antiproton storage ring are constructed using permanent magnet ferrite bricks surrounding a steel pole and housed inside a steel flux return shell. The transfer line consists of 51 dipoles, 67 gradient magnets, and 8 quadrupoles. The Recycler ring consists of approximately 350 gradient magnets and 60 quadrupoles. positioning and handling large steel plates lined with magnetized ferrite bricks pose several challenges to the design of assembly tooling. Large attractive forces between mating magnet subassemblies must be controlled in order to minimize personnel hazards. positioning of subassemblies must be precise to allow insertion of mechanical fasteners and to maintain consistent magnetic performance in all similar magnets and provisions must be made for magnet disassembly in the event that repairs or adjustments are indicated by magnetic measurements. This paper describes and illustrates the assembly tooling designed and fabricated to facilitate construction of all of the nearly 500 dipole and gradient magnet assemblies in the 8 GeV beam transfer line and Recycler ring. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Nicol, TH (reprint author), Fermi Natl Accelerator Lab, POB 500,MS 316, Batavia, IL 60510 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3710 EP 3712 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801210 ER PT B AU Nogiec, JM Desavouret, E Orris, D Pachnik, J Sharonov, S Sim, J Tompkins, JC Trombly-Freytag, K AF Nogiec, JM Desavouret, E Orris, D Pachnik, J Sharonov, S Sim, J Tompkins, JC Trombly-Freytag, K BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A distributed monitoring and control system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A monitoring and control system designed and implemented by Fermilab's Development and Test Department is presented. The system consists of a set of configurable communicating distributed objects. It includes graphical user interfaces, archivers, a data acquisition subsystem, and direct control components. The system is open and its functionality can be altered by: a) selecting modules that plug into an event-based software bus, b) developing new modules with help of the existing APIs to access system resources, and c) modifying system configuration data. This paper presents the system architecture, discusses its unique features, and describes applications of the system to control tests of superconducting accelerator magnets. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Nogiec, JM (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3713 EP 3715 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801211 ER PT B AU Pellico, W Colestock, P AF Pellico, W Colestock, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Pulsed magnetic field measurement using a ferrite waveguide in a phase bridge circuit SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB There are several standard methods used for measuring pulsed magnetic fields. However the induction or Hall probe methods have limited bandwidth and experience reflection problems. The integrated magnetic field can only be found by measuring along the entire length of the magnet. Problems with reflections, noise and bandwidth will limit the accuracy of measurement. Presented in the following paper is a method for measuring pulsed fields without the typical noise errors and bandwidth limitations. This paper will describe a phase bridge network that relies upon the permeability of a ferrite waveguide to accurately measure the integrated field of a Main Injector kicker magnet. We present some data taken with the system, a first pass at the analysis of this data, and discuss some possible design variations. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Pellico, W (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3716 EP 3718 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801212 ER PT B AU Houck, TL Westenskow, GA Kim, JS Eylon, S Henestroza, E Yu, SS Vanecek, D AF Houck, TL Westenskow, GA Kim, JS Eylon, S Henestroza, E Yu, SS Vanecek, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Stacked insulator induction accelerator gaps SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Stacked insulators, with alternating layers of insulating material and conducting film, have been shown to support high surface electrical field stresses. We have investigated the application of the stacked insulator technology to the design of induction accelerator modules for the Relativistic-Klystron Two-Beam Accelerator program. The rf properties of the accelerating gaps using stacked insulators, particularly the impedance at frequencies above the beam pipe cutoff frequency, are investigated. Low impedance is critical for Relativistic Klystron Two-Beam Accelerator applications where a high current, bunched beam is transported through many accelerating gaps. An induction accelerator module designs using st stacked insulator is presented. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Houck, TL (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 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 0-7803-4376-X PY 1998 BP 3722 EP 3724 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801214 ER PT B AU Gerken, E Gahl, JM Rees, D Roybal, W Cummings, K AF Gerken, E Gahl, JM Rees, D Roybal, W Cummings, K BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Resonant ring for testing of accelerator rf windows SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A klystron-driven resonant ring has been designed and assembled at the Los Alamos National Laboratory for use in the Accelerator Production of Tritium Project (APT). The ring was built to test rf windows for the 700 MHz section of the APT accelerator. The ring has been designed to apply an effective power of approximately 1 MW on test windows. Details of ring design, operation and performance will be presented. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Gerken, E (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. NR 3 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3725 EP 3727 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801215 ER PT B AU Jason, AJ Blind, B Halbach, K AF Jason, AJ Blind, B Halbach, K BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam expansion with specified final distributions SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The formation of nearly uniformly distributed beams has been accomplished by the use of multipole magnets. Multipole fields, however, are an inappropriate basis for creating precise distributions, particularly since substantial departures from uniformity are produced with a finite number of multipole elements. A more appropriate formalism that allows precise formation of a desired distribution is presented. Design of nonlinear magnets for uniform-beam production and the optics of an accompanying expansion system are presented. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Jason, AJ (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663,MS 808, Los Alamos, NM 87545 USA. NR 5 TC 0 Z9 0 U1 1 U2 6 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3728 EP 3730 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801216 ER PT B AU Kurennoy, SS Jason, AJ Krawczyk, FL Power, J AF Kurennoy, SS Jason, AJ Krawczyk, FL Power, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Development of a fast traveling-wave beam chopper for the National Spallation Neutron Source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB High current and severe restrictions on beam losses, below 1 nA/m, in the designed linac for the National Spallation Neutron Source (NSNS) require clean and fast - with the rise time from 2% to 98% less than 2.5 ns to accommodate a 402.5-MHz beam structure - beam chopping in its front end, at the beam energy 2.5 MeV. The R&D program includes both modification of the existing LANSCE coax-plate chopper to reduce parasitic coupling between adjacent plates, and development of new traveling-wave deflecting structures, in particular, based on a meander line. Using analytical methods and three-dimensional time-domain computer simulations we study transient effects in such structures to choose an optimal chopper design. C1 Univ Calif Los Alamos Natl Lab, LANSCE 1, Los Alamos, NM 87545 USA. RP Kurennoy, SS (reprint author), Univ Calif Los Alamos Natl Lab, LANSCE 1, Los Alamos, NM 87545 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3731 EP 3733 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801217 ER PT B AU Anderson, DE Stover, G AF Anderson, DE Stover, G BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design of Quasi-Traveling Wave finger magnet for beam diagnostics on the Advanced Light Source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A beam diagnostic tool to modify single bunch orbits in all four quadrants is proposed for measuring various machine physics parameters at the Advanced Light Source (ALS). Quasi-Traveling Wave pinger magnets were chosen to provide programmable bipolar horizontal and vertical kicks of sufficient duration while providing negligible deflection on subsequent beam revolutions in the storage ring. This magnet technology, originally investigated at the SSC[1], provides a cost-effective method of achieving the moderately fast pulse requirements of the pinger application. The design of the pinger magnet and associated pulsed power drive unit will be presented. Electrical response results of initial pinger magnet prototypes and ceramic beampipe coatings will be given. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Anderson, DE (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd, 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 0-7803-4376-X PY 1998 BP 3734 EP 3736 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801218 ER PT B AU Leung, KN Lee, Y Mashaw, A Wutte, D Gough, RA AF Leung, KN Lee, Y Mashaw, A Wutte, D Gough, RA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI TiN coating of accelerator beamline chambers SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A titanium nitride (TiN) coating can reduce multipactoring problems in vacuum cavities and also reduce photoemission electrons from beam-pipe surfaces. A new technique is being explored at LBNL that will allow an efficient way to coat differently-shaped surfaces with TiN. In this technique, an rf-induction discharge with an exposed Ti induction antenna is employed. Tests are being performed using argon, nitrogen, and a mixture of argon and nitrogen gases. It is found that the characteristics of the TiN coating depends on the processing time and the gas that forms the discharge plasma. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Leung, KN (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 2 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3737 EP 3739 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801219 ER PT B AU Corvin, C AF Corvin, C BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Harmonic resonance analysis for PEP-II power factor correction upgrades SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Recent upgrades to the high voltage utility distribution network at the Stanford Linear Accelerator Center have been accompanied by the installation of a large number of power supplies associated with the PEP-II B Factory project. These power supplies include a diverse assortment of single and three phase units, in two, six and twelve pulse configurations with chopped, pulsed and continuous loading. Viewed as harmonic power sources in a range from a hundred to several kilohertz, they have the potential to be in resonance with the utility system network, a condition to be avoided. This paper analyzes and evaluates these resonance conditions with a view toward adding electric power factor correction upgrades to achieve substantial cost savings associated with power factor penalty avoidance. Similar studies and upgrades at SLAG in the past have reduced electric power costs over time by several hundred thousand dollars thus providing the incentive to evaluate the recent upgrades to the PEP-II network. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Corvin, C (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3746 EP 3748 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801222 ER PT B AU Liu, F Brown, I Phillips, L Biallas, G Siggins, T AF Liu, F Brown, I Phillips, L Biallas, G Siggins, T BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A method of producing very high resistivity surface conduction on ceramic accelerator components using metal ion implantation SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID VACUUM AB An important technique used for the suppression of surface flashover on high voltage DC ceramic insulators as well as for RF windows is that of providing some surface conduction to bleed off accumulated surface charge. We have used metal ion implantation to modify the surface of high voltage ceramic vacuum insulators to provide a uniform surface resistivity of approximately 5 x 10(10) Omega/square. A vacuum are ion source based implanter was used to implant Pt at an energy of about 135 keV to 16 ions/cm(2) into small doses of up to more than 5 x 10 ceramic test coupons and also into the inside surface of several ceramic accelerator columns 25 cm I. D. by 28 cm long. Here we describe the experimental set-up used to do the ion implantation and summarize the results of our exploratory work on implantation into test coupons as well as the implantations of the actual ceramic columns. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Liu, F (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 11 TC 1 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3752 EP 3754 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801224 ER PT B AU Legg, R Dunham, B Higgins, S Kazimi, R Kehne, D Oren, T AF Legg, R Dunham, B Higgins, S Kazimi, R Kehne, D Oren, T BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Interactive troubleshooting guide for accelerators SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Modern accelerators face the challenge of supporting increased machine complexity and higher levels of utilization while relying on downsized maintenance and support groups. To improve system availability, reduce reliance on system experts and provide a systematic approach to problem solving, an interactive troubleshooting guide has been implemented for the CEBAF injector at Jefferson Lab. This guide, which uses a tree structure with appropriate hypertext links, traces problems from a set of "symptoms," through a series of diagnostic tests, to a specific corrective action. This guide is used in conjunction with an active parameter monitoring system that is part of the EPICS control system tool kit. The monitoring system generates operator alarms when injector RF or magnet parameters fall outside pre-set windows. Operators receive immediate feedback when injector components vary from their standard values and the troubleshooting guide provides a systematic means to identify and ultimately correct the problem. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23066 USA. RP Legg, R (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23066 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 0-7803-4376-X PY 1998 BP 3755 EP 3757 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801225 ER PT B AU Tiefenback, MG Doolittle, L Benesch, JF AF Tiefenback, MG Doolittle, L Benesch, JF BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Runtime accelerator configuration tools at Jefferson Laboratory SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB RF and magnet system configuration and monitoring tools are being implemented at Jefferson Lab to improve system reliability and reduce operating costs. They are prototype components of the Momentum Management System [1] being developed. The RF is of special interest because it affects the momentum and momentum spread of the beam, and because of the immediate financial benefit of managing the klystron DC supply power. We describe present and planned monitoring of accelerating system parameters, use of these data, RF system performance calculations, and procedures for magnet configuration for handling beam of any of five beam energies to any of three targets. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Tiefenback, MG (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 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 0-7803-4376-X PY 1998 BP 3758 EP 3760 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801226 ER PT B AU Wiseman, M Sinclair, CK Whitney, R Zarecky, M Vetterlein, R AF Wiseman, M Sinclair, CK Whitney, R Zarecky, M Vetterlein, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI High power electron beam dumps at CEBAF SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The CEBAF accelerator produces a very small emittance CW electron beam of up to 200 mu A average current. The resulting beam power, up to 1 MW at 5 GeV, and the very high beam power density, pose challenging problems for beam dump design. Two styles of high power dumps have been developed. The first, rated for 100+ kW, is used for beam tune-up and accelerator commissioning. The beam power is entirely contained in metal in this dump, minimizing the problems associated with radioactive water handling. Full power 1 MW dumps are used with the experimental halls. In these dumps, one-third of the beam power is directly absorbed in water. Both dump designs require the beam to be rastered when the smallest beam sizes are used. Design details for each of these dumps will be presented. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Wiseman, M (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, 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 0-7803-4376-X PY 1998 BP 3761 EP 3763 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801227 ER PT B AU Lisowski, PW AF Lisowski, PW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The accelerator production of tritium project SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Tritium is essential for U.S, nuclear weapons to function, but because it is radioactive with a half-life of 12.3 years, the supply must be periodically replenished. Since the last production reactor stopped operating in 1988, tritium has been recovered from dismantled nuclear weapons. This process is possible only as long as many weapons are being retired and will not work indefinitely, thus requiring the United States to bring a new tritium production capability on line. To make the required amount of tritium using an accelerator system (APT), neutrons will be generated by high-energy proton reactions with tungsten and lead. Those neutrons will be moderated, and captured to make tritium. The APT plant design is based on a 1700 MeV linear accelerator operated at 100 mA CW. In preparation for engineering design, scheduled to start in October 1997, and subsequent construction, a program of engineering development and demonstration is underway. That work includes assembly of a 20 MeV, 100 mA low-energy linac plant prototype, high-energy linac accelerating structure protoyping, radio-frequency system improvements, neutronic efficiency measurements, and materials qualifications. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Lisowski, PW (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 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 0-7803-4376-X PY 1998 BP 3780 EP 3784 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801232 ER PT B AU Neri, F Thiessen, HA Walstrom, PL AF Neri, F Thiessen, HA Walstrom, PL BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Synchrotrons and beamlines for proton radiography SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A 50 GeV accelerator complex for dynamic proton radiography, including a linac, synchrotron, and multiple isochronous beamlines is described, and critical technology development is outlined. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Neri, F (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3788 EP 3790 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801234 ER PT B AU Ludewigt, BA AF Ludewigt, BA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Clinical requirements and accelerator concepts for BNCT SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID NEUTRON-CAPTURE THERAPY; THICK; DEUTERONS AB Accelerator-based neutron sources are an attractive alternative to nuclear reactors for providing epithermal neutron beams for Boron Neutron Capture Therapy. Based on clinical requirements and neutronics modeling the use of proton and deuteron induced reactions in Li-7 and Be-9 targets has been compared. Excellent epithermal neutron beams can be produced via the Li-7(p,n)Be-7 reaction at proton energies of similar to 2.5 MeV. An electrostatic quadrupole accelerator and a lithium target, which can deliver and handle 2.5 MeV protons at beam currents up to 50 mA, are under development for an accelerator-based BNCT facility at the Lawrence Berkeley National Laboratory. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Ludewigt, BA (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 20 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3791 EP 3795 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801235 ER PT B AU Pasquinelli, RJ AF Pasquinelli, RJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A 3He++ RFQ accelerator for the production of PET isotopes SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Project status of the 3He(++) 10.5 MeV RFQ Linear Accelerator for the production of PET isotopes will be presented. The accelerator design was begun in September of 1995 with a goal of completion and delivery of the accelerator to BRF in Shreveport, Louisiana by the summer of 1997. The design effort and construction is concentrated in Lab G on the Fermilab campus. Some of the high lights include a 25 mA peak current 3He(+) ion source, four RFQ accelerating stages that ate powered by surplus Fermilab linac RF stations, a gas jet charge doubler, and a novel 540 degree bending Medium Energy Beam Transport (MEBT). The machine is designed to operate at 360 Hz repetition rate with a 2.5% duty cycle. The average beam current is expected to be 150-300 micro amperes electrical, 75-150 micro amperes particle current. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Pasquinelli, RJ (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 3804 EP 3806 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801238 ER PT B AU Celata, CM Amman, M Donahue, R Leung, KN Luke, PN Perkins, LT Zawislanski, PT Hua, D AF Celata, CM Amman, M Donahue, R Leung, KN Luke, PN Perkins, LT Zawislanski, PT Hua, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A new intense neutron tool for radiography and detection of water and ground contaminants SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID COPLANAR AB Advances in ion sources and gamma ray detection at LBNL are being applied to enhance neutron logging tools. A rf-driven plasma ion source has been miniaturized to the 2 inch diameter necessary for most underground uses. The ion current produced is >80% monatomic, and is projected to produce a neutron flux of 10(9) - 10(10) neutrons/sec, an enhancement of 1-2 orders of magnitude over the state-of-the-art. A 1.5 x 1.5 x I cm(3) CdZnTe gamma detector is also being developed for the tool. This detector has relatively high efficiency, good energy resolution, and room temperature operation. Results of 3-D Monte Carlo calculations are presented which show the enhancements in sensitivity and range possible with the new technology. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Celata, CM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 47-112,1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 8 TC 0 Z9 0 U1 0 U2 4 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3807 EP 3809 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801239 ER PT B AU Bieniosek, FM Anderson, K Pasquinelli, RJ Popovic, M Schmidt, CW Webber, R Larson, DJ Young, P AF Bieniosek, FM Anderson, K Pasquinelli, RJ Popovic, M Schmidt, CW Webber, R Larson, DJ Young, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Charge stripper and meet for the He-3 RFQ accelerator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The He-3 RFQ linac for production of positron-emitting radioactive isotopes accelerates singly-ionized He-3(+) ions to an energy of 1 MeV in a 212.5-MHz RFQ. The ions are then stripped to form doubly-ionized He-3(++) in a gas-jet stripping cell, and transported by the MEET to the 425-MHz RFQ string for acceleration to 10.5 MeV. The stripper cell utilizes a mechanical injector to provide gas pulses to a nozzle. The directed gas jet passes across the beam into a scavenge section which pumps away the gas. The MEET is an achromatic, isochronous transport section based on two 270-degree bend magnets. It . provides bunched and focused beam to the 425-MHz RFQ string. C1 Fermilab Astrophys Ctr, Batavia, IL 60510 USA. RP Bieniosek, FM (reprint author), Fermilab Astrophys Ctr, Batavia, IL 60510 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 3837 EP 3839 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801249 ER PT B AU Galambos, JD Olsen, DK AF Galambos, JD Olsen, DK BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Parameter and cost model for Spallation Neutron Source studies SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A Spallation Neutron Source Systems Model has been developed to facilitate parameter and cost studies of accelerator-based spallation neutron source (SNS) systems. This model includes modules for all pertinent components and processes, such as accelerators and rings, target (neutron source), experimental facilities, conventional facilities, construction costs, preoperational costs, etc. Present accelerator modules include room temperature linacs, accumulator rings (AR) and rapid cycling synchrotrons (RCS). All the modules in the model are linked together via an optimizer to facilitate overall trade studies. The model has been developed for and used by the National Spallation Neutron Source (NSNS) project to be built in Oak Ridge. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Galambos, JD (reprint author), Oak Ridge Natl Lab, 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 0-7803-4376-X PY 1998 BP 3851 EP 3853 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582801254 ER PT S AU Driessen, BJ Feddema, JT Kwok, KS AF Driessen, BJ Feddema, JT Kwok, KS GP AMER AUTOMAT CONTROL COUNCIL TI Decentralized fuzzy control of multiple nonholonomic vehicles SO PROCEEDINGS OF THE 1998 AMERICAN CONTROL CONFERENCE, VOLS 1-6 SE PROCEEDINGS OF THE AMERICAN CONTROL CONFERENCE LA English DT Proceedings Paper CT American Control Conference CY JUN 24-26, 1998 CL PHILADELPHIA, PA SP Amer Automat Control Council, AIAA, AIChE, ASCE, IEEE, ISA, SCS AB This work considers the problem of controlling multiple nonholonomic vehicles so that they converge to a scent source without colliding with each other. Since the control is to be implemented on a simple 8-bit microcontroller, fuzzy control rules are used to simplify a linear quadratic regulator control design. The inputs to the fuzzy controllers for each vehicle are the noisy direction to the source, the distance to the closest neighbor vehicle, and the direction to the closest vehicle. These directions are discretized into four values: Forward, Behind, Left, and Right; and the distance into three values: Near, Far, and Gone. The values of the control at these discrete values are obtained based on the collision-avoidance repulsive forces and an attractive force towards the goal. A fuzzy inference system is used to obtain control values for inputs between the small number of discrete input values. Simulation results are provided which demonstrate that the fuzzy control law performs well compared to the exact controller. In fact, the fuzzy controller demonstrates improved robustness to noise. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Driessen, BJ (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 0-7803-4530-4 J9 P AMER CONTR CONF PY 1998 BP 404 EP 410 PG 7 WC Automation & Control Systems; Computer Science, Interdisciplinary Applications SC Automation & Control Systems; Computer Science GA BL45T UT WOS:000075568200087 ER PT S AU Bialasiewicz, JT Muljadi, E Drouilhet, S Nix, G AF Bialasiewicz, JT Muljadi, E Drouilhet, S Nix, G GP AMER AUTOMAT CONTROL COUNCIL TI Hybrid power systems with diesel and wind turbine generation SO PROCEEDINGS OF THE 1998 AMERICAN CONTROL CONFERENCE, VOLS 1-6 SE PROCEEDINGS OF THE AMERICAN CONTROL CONFERENCE LA English DT Proceedings Paper CT American Control Conference CY JUN 24-26, 1998 CL PHILADELPHIA, PA SP Amer Automat Control Council, AIAA, AIChE, ASCE, IEEE, ISA, SCS AB In this paper, we present a modular simulation system developed to study the dynamics and to aid in the design of hybrid power systems with diesel and wind turbine generation. The emphasis is placed on the representation of the dynamics of the elements of a real system and on the control aspects of the modules. Each module represents a component of the hybrid power system such as the diesel generator, wind turbine generator, village load etc. Various system configurations with different load and wind resource profiles can be simulated. This tool can be used to study the transient and the steady-state interaction of the various components of a hybrid system. It is especially useful when a new configuration of a power system is to be analyzed, a new load or wind speed profile has to be included, additional modules have been installed in an existing power system, or an old control strategy is to be replaced by a new one. C1 Natl Wind Technol Ctr, Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Bialasiewicz, JT (reprint author), Natl Wind Technol Ctr, Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 0 TC 2 Z9 4 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 0-7803-4530-4 J9 P AMER CONTR CONF PY 1998 BP 1705 EP 1709 PG 5 WC Automation & Control Systems; Computer Science, Interdisciplinary Applications SC Automation & Control Systems; Computer Science GA BL45T UT WOS:000075568200361 ER PT S AU Muljadi, E Pierce, K Migliore, P AF Muljadi, E Pierce, K Migliore, P GP AMER AUTOMAT CONTROL COUNCIL TI Control strategy for variable-speed, stall-regulated wind turbines SO PROCEEDINGS OF THE 1998 AMERICAN CONTROL CONFERENCE, VOLS 1-6 SE PROCEEDINGS OF THE AMERICAN CONTROL CONFERENCE LA English DT Proceedings Paper CT American Control Conference CY JUN 24-26, 1998 CL PHILADELPHIA, PA SP Amer Automat Control Council, AIAA, AIChE, ASCE, IEEE, ISA, SCS AB A variable-speed, constant-pitch wind turbine was investigated to evaluate the feasibility of constraining its rotor speed and power output without the benefit of active aerodynamic control devices. A strategy was postulated to control rotational speed by specifying the demanded generator torque. By controlling rotor speed in relation to wind speed the aerodynamic power extracted by the blades from the wind was manipulated. Specifically, the blades were caused to stall in high winds. In low and moderate winds, the demanded generator torque and the resulting rotor speed were controled to cause the wind turbine to operate near maximum efficiency. A computational model was developed, and simulations were conducted of operation in high turbulent winds. Results indicated that rotor speed and power output were well regulated. C1 Natl Wind Technol Ctr, Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Muljadi, E (reprint author), Natl Wind Technol Ctr, Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 0 TC 10 Z9 11 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 0-7803-4530-4 J9 P AMER CONTR CONF PY 1998 BP 1710 EP 1714 PG 5 WC Automation & Control Systems; Computer Science, Interdisciplinary Applications SC Automation & Control Systems; Computer Science GA BL45T UT WOS:000075568200362 ER PT S AU Field, RV Bergman, LA AF Field, RV Bergman, LA GP AMER AUTOMAT CONTROL COUNCIL TI Investigating a reliable covariance control scheme for MDOF systems SO PROCEEDINGS OF THE 1998 AMERICAN CONTROL CONFERENCE, VOLS 1-6 SE PROCEEDINGS OF THE AMERICAN CONTROL CONFERENCE LA English DT Proceedings Paper CT American Control Conference CY JUN 24-26, 1998 CL PHILADELPHIA, PA SP Amer Automat Control Council, AIAA, AIChE, ASCE, IEEE, ISA, SCS AB The authors attempt to extend their previous efforts towards a reliable control scheme that guarantees a specified degree of reliability for civil engineering structures. Herein, a two degree-of-freedom system is examined. Covariance control techniques are explored to design a compensator that will provide optimal closed-loop performance, while satisfying a constraint on system reliability. It was found for the system under examination that a stable control does not exist that also meets the target reliability level. Alternate formulations continue to be investigated. C1 Sandia Natl Labs, Struct Dynam & Vibrat Control Dept, Albuquerque, NM 87185 USA. RP Field, RV (reprint author), Sandia Natl Labs, Struct Dynam & Vibrat Control Dept, POB 5800, Albuquerque, NM 87185 USA. OI Field, Richard/0000-0002-2765-7032 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 0743-1619 BN 0-7803-4530-4 J9 P AMER CONTR CONF PY 1998 BP 2564 EP 2568 PG 5 WC Automation & Control Systems; Computer Science, Interdisciplinary Applications SC Automation & Control Systems; Computer Science GA BL45T UT WOS:000075568200548 ER PT S AU Hauer, JF Taylor, CW AF Hauer, JF Taylor, CW GP AMER AUTOMAT CONTROL COUNCIL TI Information, reliability, and control in the new power system SO PROCEEDINGS OF THE 1998 AMERICAN CONTROL CONFERENCE, VOLS 1-6 SE PROCEEDINGS OF THE AMERICAN CONTROL CONFERENCE LA English DT Proceedings Paper CT American Control Conference CY JUN 24-26, 1998 CL PHILADELPHIA, PA SP Amer Automat Control Council, AIAA, AIChE, ASCE, IEEE, ISA, SCS AB Deregulation of North American markets in electrical power promises serious new challenges to automatic control and to the information infrastructure in which automatic control is imbedded. What kind of control is viable under deregulation? The economic consequences of controller performance promise to be very high. Will infrastructure costs and liability issues discourage use of wide area controls? Can controller performance be assured to the extent that controller services can be marketed in the same sense as other commodities? In the quest for power system reliability, what new balance is evolving between automatic control and less technical methods? The intent of this paper is to further the dialog between the power system and the automatic control communities on such issues. Examples taken from the Western System breakups of 1996 argue that full use of automatic control as a means for power system reinforcement is strongly contingent upon new infrastructure for planning and operation. C1 Battelle Mem Inst, Pacific NW Labs, Richland, WA 99352 USA. RP Hauer, JF (reprint author), Battelle Mem Inst, Pacific NW Labs, POB 999, Richland, WA 99352 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 0-7803-4530-4 J9 P AMER CONTR CONF PY 1998 BP 2986 EP 2991 PG 6 WC Automation & Control Systems; Computer Science, Interdisciplinary Applications SC Automation & Control Systems; Computer Science GA BL45T UT WOS:000075568200640 ER PT S AU Driessen, BJ Kwok, KS AF Driessen, BJ Kwok, KS GP AMER AUTOMAT CONTROL COUNCIL TI A multi-objective dynamic programming approach to constrained discrete-time optimal control SO PROCEEDINGS OF THE 1998 AMERICAN CONTROL CONFERENCE, VOLS 1-6 SE PROCEEDINGS OF THE AMERICAN CONTROL CONFERENCE LA English DT Proceedings Paper CT American Control Conference CY JUN 24-26, 1998 CL PHILADELPHIA, PA SP Amer Automat Control Council, AIAA, AIChE, ASCE, IEEE, ISA, SCS AB This work presents a multi-objective differential dynamic programming approach to constrained discrete-time optimal control. In the backward sweep of the dynamic programming in the quadratic sub problem, the sub problem input at a stage or time step is solved for in terms of the sub problem state entering that stage so as to minimize the summed immediate and future cost subject to minimizing the summed immediate and future constraint violations, for all such entering states. The method differs from previous dynamic programming methods, which used penalty methods, in that the constraints of the sub problem, which may include terminal constraints and path constraints, are solved exactly if they are solvable; otherwise, their total violation is minimized. Again, the resulting solution of the sub problem is an input history that minimizes the quadratic cost function subject to being a minimizer of the total constraint violation. The expected quadratic convergence of the proposed algorithm is demonstrated on a numerical example. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Driessen, BJ (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 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 0743-1619 BN 0-7803-4530-4 J9 P AMER CONTR CONF PY 1998 BP 3077 EP 3083 PG 7 WC Automation & Control Systems; Computer Science, Interdisciplinary Applications SC Automation & Control Systems; Computer Science GA BL45T UT WOS:000075568200659 ER PT S AU Driessen, BJ Sadegh, N Parker, GG AF Driessen, BJ Sadegh, N Parker, GG GP AMER AUTOMAT CONTROL COUNCIL TI Toward linear complexity optimal control for sparsely interconnected dynamic systems SO PROCEEDINGS OF THE 1998 AMERICAN CONTROL CONFERENCE, VOLS 1-6 SE PROCEEDINGS OF THE AMERICAN CONTROL CONFERENCE LA English DT Proceedings Paper CT American Control Conference CY JUN 24-26, 1998 CL PHILADELPHIA, PA SP Amer Automat Control Council, AIAA, AIChE, ASCE, IEEE, ISA, SCS AB This work presents approaches aimed at achieving Order((number of states)(number of time steps)) complexity for optimal control synthesis for sparsely interconnected dynamic systems. The methods are then applied to a concrete example of a mechanical rod discretized into a discrete number of masses connected with springs. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Driessen, BJ (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 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 0743-1619 BN 0-7803-4530-4 J9 P AMER CONTR CONF PY 1998 BP 3118 EP 3120 PG 3 WC Automation & Control Systems; Computer Science, Interdisciplinary Applications SC Automation & Control Systems; Computer Science GA BL45T UT WOS:000075568200669 ER PT B AU Sezgen, O Marnay, C Bretz, S Markel, R Wiser, R AF Sezgen, O Marnay, C Bretz, S Markel, R Wiser, R BE CampbellHowe, R Cortez, T WilkinsCrowder, B TI Opportunities for wind resources in the future competitive California power market SO PROCEEDINGS OF THE 1998 AMERICAN SOLAR ENERGY SOCIETY ANNUAL CONFERENCE LA English DT Proceedings Paper CT Annual Conference of the American-Solar-Energy-Society CY JUN 14-17, 1998 CL ALBUQUERQUE, NM SP Amer Solar Energy Soc, US DOE, Org Amer States, Sandi Natl Labs, Univ New Mexico, NationsBank, New Mexico Land Off, US DOE, Albuquerque Operat Off, Public Serv Co New Mexico, New Mexico Energy Off AB The goal of this work is to evaluate the profitability of wind development in the future competitive California power market. The viability of possible wind sites is assessed using a geographic information system (GIS) to determine the cost of development and Elfin, an electric utility production costing and capacity expansion model, to estimate the possible revenues and profits of wind farms at the sites. This approach improves on a simple profitability calculation by using site specific development cost calculations and by taking the effect of time varying market prices on revenues into account. The first component of the work is the characterization of wind resources suitable for use in production costing :md capacity expansion models such as Elfin that are capable of simulating competitive electricity markets. An improved representation of California wind resources is built, using information collected by the California Energy Commission in previous site evaluations, and by using a GIS approach to estimating development costs at 36 specific sites. These sites, which have been identified as favorable for wind development, are placed on Digital Elevation Models and development costs are calculated based on distances to roads and transmission lines. GIS is also used to develop the potential capacity at each site by making use of the physical characteristics of the terrain, such as ridge lengths. Tn the second part of the effort, using a previously developed algorithm for simulating competitive entry to the California electricity market, Elfin is used to gauge the viability of wind farms at the 36 sites. The results of this exercise are ft,recasts of profitable development levels at each site and the effects of these developments on the electricity system as a whole. Results suggest that by the year 2030, about 7.5 GW of potential wind capacity can be profitably developed assuming rising natural gas prices. This example demonstrates that an analysis based on a simple levelized profitability calculation approach does not completely capture the implications of time varying prices in a competitive market. C1 Ernest Orlando Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Energy Anal Dept, Berkeley, CA 94720 USA. RP Sezgen, O (reprint author), Ernest Orlando Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Energy Anal Dept, MS 90-4000, Berkeley, CA 94720 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN SOLAR ENERGY SOCIETY INC PI BOULDER PA 2400 CENTRAL AVE, SUITE G-1, BOULDER, CO 80301 USA BN 0-89553-170-4 PY 1998 BP 151 EP 157 PG 7 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA BP59C UT WOS:000085592900023 ER PT B AU Lilienthal, P Campbell, K AF Lilienthal, P Campbell, K BE CampbellHowe, R Cortez, T WilkinsCrowder, B TI International off-grid market assessment for dish/Stirling systems SO PROCEEDINGS OF THE 1998 AMERICAN SOLAR ENERGY SOCIETY ANNUAL CONFERENCE LA English DT Proceedings Paper CT Annual Conference of the American-Solar-Energy-Society CY JUN 14-17, 1998 CL ALBUQUERQUE, NM SP Amer Solar Energy Soc, US DOE, Org Amer States, Sandi Natl Labs, Univ New Mexico, NationsBank, New Mexico Land Off, US DOE, Albuquerque Operat Off, Public Serv Co New Mexico, New Mexico Energy Off AB Several features of dish/Stirling technology offer potential advantages for off-grid power generation Dish/Stirling technology's size, modularity, the ease with which it might be hybridized with a storable fuel, the elimination of batteries and inverters, and the production of pure sine-wave AC power without a diesel all indicate that a reliable dish/Stirling module could fit well into an off-grid electrification scheme. At the same time, a combination of factors makes success in off-grid applications difficult, regardless of the technology under consideration. Obstacles include consumer expectations (formed by a long history of subsidies) that electricity should be cheap, existing support infrastructure, and the economic resources of rural communities. Cost is always a factor, but reliability and access to parts and service have been more significant barriers so far in the establishment of renewables. This paper summarizes a much more extensive market assessment.(1) Initial research indicates that a reliable 25 kW dish/Stirling system with reasonable servicing requirements could compete well with other off-grid power systems at a cost considered achievable at early production levels ($3,500 per kW). However, by itself the off-grid power market in regions with adequate solar insolation and inviting political regimes does not justify an adequate scale of production. It is estimated that the aggregate market in five of the largest and most promising countries for which adequate information was available could be 23,000 to 38,000 units of 25 kW dish/Stirling systems. Including the rest of the developing world could more than double this number. However, at a reasonable initial market penetration rate of 1% per year this market is not sufficient, by itself, for the mass production rates required to achieve the necessary economies of scale. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Lilienthal, P (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 8 TC 0 Z9 0 U1 0 U2 3 PU AMERICAN SOLAR ENERGY SOCIETY INC PI BOULDER PA 2400 CENTRAL AVE, SUITE G-1, BOULDER, CO 80301 USA BN 0-89553-170-4 PY 1998 BP 283 EP 288 PG 6 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA BP59C UT WOS:000085592900043 ER PT B AU Christensen, C Barker, G AF Christensen, C Barker, G BE CampbellHowe, R Cortez, T WilkinsCrowder, B TI Annual system efficiencies for solar water heating SO PROCEEDINGS OF THE 1998 AMERICAN SOLAR ENERGY SOCIETY ANNUAL CONFERENCE LA English DT Proceedings Paper CT Annual Conference of the American-Solar-Energy-Society CY JUN 14-17, 1998 CL ALBUQUERQUE, NM SP Amer Solar Energy Soc, US DOE, Org Amer States, Sandi Natl Labs, Univ New Mexico, NationsBank, New Mexico Land Off, US DOE, Albuquerque Operat Off, Public Serv Co New Mexico, New Mexico Energy Off AB In this paper, we investigate annual system efficiencies for solar water heating as a basis for extrapolating performance across a range of climates. Annual system efficiency is found to be remarkably insensitive to climate, based on TRNSYS simulations for 167 cities in the continental United States. If a single efficiency value from a representative climate (such as Topeka, Kansas) is used for ail 167 cities, the root-mean-square (rms) error is about 0.5 percentage points of efficiency. Efficiencies increase slightly with decreasing ambient temperature; in the coldest climates efficiencies are approximately 1.2 percentage points higher than the 167-city mean, and in the hottest climates efficiencies are approximately 0.7 percentage points lower than the mean. Efficiencies increase with increasing hot water loads; for the specified solar water heating system, the 167-city mean efficiencies are 33.4, 39.4, and 42.9% for hot water loads of 150, 225, and 300 liters/day, respectively. Thus, if an annual system efficiency is known for a particular system, load, and location, it is a simple matter to extrapolate performance to any (or all) other locations in the continental United States. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Christensen, C (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 4 TC 2 Z9 2 U1 0 U2 1 PU AMERICAN SOLAR ENERGY SOCIETY INC PI BOULDER PA 2400 CENTRAL AVE, SUITE G-1, BOULDER, CO 80301 USA BN 0-89553-170-4 PY 1998 BP 291 EP 296 PG 6 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA BP59C UT WOS:000085592900044 ER PT B AU Burch, JD Thomas, KE AF Burch, JD Thomas, KE BE CampbellHowe, R Cortez, T WilkinsCrowder, B TI Solar thermal water pasteurization SO PROCEEDINGS OF THE 1998 AMERICAN SOLAR ENERGY SOCIETY ANNUAL CONFERENCE LA English DT Proceedings Paper CT Annual Conference of the American-Solar-Energy-Society CY JUN 14-17, 1998 CL ALBUQUERQUE, NM SP Amer Solar Energy Soc, US DOE, Org Amer States, Sandi Natl Labs, Univ New Mexico, NationsBank, New Mexico Land Off, US DOE, Albuquerque Operat Off, Public Serv Co New Mexico, New Mexico Energy Off AB Methods for treatment of supply water which are appropriate for developing countries include chlorination, filtration, ultraviolet irradiance, and pasteurization. This study discusses the fundamentals of flow-through solar thermal water pasteurization and illustrates system optimization. We derive an analytical expression for the flow rate using a linear collector model and assuming pure conduction heat transfer in the heat exchanger. Flow initiates near that irradiance in which the corresponding stagnation temperature equals the pasteurization temperature. Flow increases monotonically with increasing irradiance, decreasing pasteurization temperature, and increasing heat exchanger area. Predicted clear-day production is 900, 1210, 2700 liters/day/m(col)(2) (238, 320, and 712 gal/day/m(col)(2)) for non-selective, selective and evacuated tube systems, respectively, assuming optimally-sized heat exchangers. Optimum heat exchanger size minimizes water treatment cost, and depends upon the ratio of heat exchanger cost to collector cost. It is observed that the optimum heat exchanger size corresponds to roughly equal investments in the heat exchanger and the collector, independent of the relative costs. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Burch, JD (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 4 TC 0 Z9 0 U1 0 U2 2 PU AMERICAN SOLAR ENERGY SOCIETY INC PI BOULDER PA 2400 CENTRAL AVE, SUITE G-1, BOULDER, CO 80301 USA BN 0-89553-170-4 PY 1998 BP 389 EP 393 PG 5 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA BP59C UT WOS:000085592900060 ER PT B AU Maxwell, EL George, RL Wilcox, SM AF Maxwell, EL George, RL Wilcox, SM BE CampbellHowe, R Cortez, T WilkinsCrowder, B TI A climatological solar radiation model SO PROCEEDINGS OF THE 1998 AMERICAN SOLAR ENERGY SOCIETY ANNUAL CONFERENCE LA English DT Proceedings Paper CT Annual Conference of the American-Solar-Energy-Society CY JUN 14-17, 1998 CL ALBUQUERQUE, NM SP Amer Solar Energy Soc, US DOE, Org Amer States, Sandi Natl Labs, Univ New Mexico, NationsBank, New Mexico Land Off, US DOE, Albuquerque Operat Off, Public Serv Co New Mexico, New Mexico Energy Off AB In 1995 the National Renewable Energy Laboratory (NREL) initiated the Data Grid Task under the U.S. Department of Energy Resource Assessment Program. The primary objective of the Data Grid Task is to estimate climatological averages of daily-total solar radiation at each point (cell) on a high-resolution (e.g., 40-km) uniform grid, using climatological parameters as input to a solar radiation model. This paper describes the model, sources of input data, model products, and the initial evaluations of the model performance. The initial evaluations included comparisons of model output with 30-year averages derived from the U.S. National Solar Radiation Data Base and measured data for India, Saudi Arabia, Egypt, and Sudan. These comparisons indicate that the model is capable of estimating monthly averages of daily-total solar radiation with an uncertainty of +/-5%, when accurate input data are available. The results also indicate that available input data will yield results with an uncertainty of about +/-10% for most locations around the world. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Maxwell, EL (reprint author), 5520 Fossil Creek Dr, Ft Collins, CO 80526 USA. NR 12 TC 10 Z9 10 U1 0 U2 2 PU AMERICAN SOLAR ENERGY SOCIETY INC PI BOULDER PA 2400 CENTRAL AVE, SUITE G-1, BOULDER, CO 80301 USA BN 0-89553-170-4 PY 1998 BP 505 EP 510 PG 6 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA BP59C UT WOS:000085592900078 ER PT B AU Marion, B AF Marion, B BE CampbellHowe, R Cortez, T WilkinsCrowder, B TI Multi-pyranometer array design and performance summary SO PROCEEDINGS OF THE 1998 AMERICAN SOLAR ENERGY SOCIETY ANNUAL CONFERENCE LA English DT Proceedings Paper CT Annual Conference of the American-Solar-Energy-Society CY JUN 14-17, 1998 CL ALBUQUERQUE, NM SP Amer Solar Energy Soc, US DOE, Org Amer States, Sandi Natl Labs, Univ New Mexico, NationsBank, New Mexico Land Off, US DOE, Albuquerque Operat Off, Public Serv Co New Mexico, New Mexico Energy Off AB The use of a multi-pyranometer array (MPA) for measuring the solar resource is an alternative to using thermopile instruments and their associated trackers and shading disks or shadowbands. The MPA consists of three or four pyranometers with fixed orientations and with different views of the sun and sky. By measuring the solar radiation received by each pyranometer and the use of an iterative model, direct normal and diffuse horizontal radiation can be determined. Although not as accurate as measuring these quantities directly, the MPA provides a lower-cost approach to measuring solar radiation, and it has excellent reliability due to its simplicity and minimal maintenance requirements. The MPA has no moving parts and does not require periodic adjustments. MPA developmental work by Faiman et al. (1) obtained monthly direct normal estimates for Sede Boqer, Israel within 4% of measurements and with a root-mean-square-error (RMSE) of about 50 W/m(2) for 10-minute averages. We evaluated MPAs at NREL's location in Golden, CO and at the Solar Village near Riyadh, Saudi Arabia. Our results are in agreement with Faiman's except for the overall RMSE for the Solar Village, which was 76 W/m(2) for 5-minute averages. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Marion, B (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 5 TC 2 Z9 2 U1 0 U2 2 PU AMERICAN SOLAR ENERGY SOCIETY INC PI BOULDER PA 2400 CENTRAL AVE, SUITE G-1, BOULDER, CO 80301 USA BN 0-89553-170-4 PY 1998 BP 523 EP 528 PG 6 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA BP59C UT WOS:000085592900081 ER PT B AU Wiser, RH Pickle, SJ AF Wiser, RH Pickle, SJ BE CampbellHowe, R Cortez, T WilkinsCrowder, B TI Selling green power in California: Product, industry, and market trends SO PROCEEDINGS OF THE 1998 AMERICAN SOLAR ENERGY SOCIETY ANNUAL CONFERENCE LA English DT Proceedings Paper CT Annual Conference of the American-Solar-Energy-Society CY JUN 14-17, 1998 CL ALBUQUERQUE, NM SP Amer Solar Energy Soc, US DOE, Org Amer States, Sandi Natl Labs, Univ New Mexico, NationsBank, New Mexico Land Off, US DOE, Albuquerque Operat Off, Public Serv Co New Mexico, New Mexico Energy Off AB As one of the first states to open its doors to retail electric competition, California offers an important opportunity to assess the effectiveness of green power marketing as a mechanism for supporting renewable energy. This study is an interim report on key green power product, industry, and market trends in California. The paper concludes with a discussion of initial lessons from the California experience. C1 Ernest Orlando Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. RP Wiser, RH (reprint author), Ernest Orlando Lawrence Berkeley Natl Lab, Environm Energy Technol Div, 1 Cyclotron Rd,MS 90-4000, Berkeley, CA 94720 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN SOLAR ENERGY SOCIETY INC PI BOULDER PA 2400 CENTRAL AVE, SUITE G-1, BOULDER, CO 80301 USA BN 0-89553-170-4 PY 1998 BP 531 EP 538 PG 8 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA BP59C UT WOS:000085592900082 ER PT B AU Gordon, SP Lehrer, DG AF Gordon, SP Lehrer, DG BE Stone, D Haluza, D TI Coordinated train control and energy management control strategies SO PROCEEDINGS OF THE 1998 ASME/IEEE JOINT RAILROAD CONFERENCE LA English DT Proceedings Paper CT 1998 ASME/IEEE Joint Railroad Conference CY APR 15-16, 1998 CL PHILADELPHIA, PA SP Amer Soc Mech Engineers, Rail Transportat Div, IEEE, Land Transportat Div, Vehicular Technol Sect AB The Bay Area Rapid Transit (BART) system, in collaboration with Hughes Aircraft Company and Harmon Industries, is in the process of developing an Advanced Automatic Train Control (AATC) system to replace the current fixed-block automatic system. In the long run, the AATC system is expected to not only allow for safe short headway operation, but also to facilitate coordinated train control and energy management. This new system will employ spread spectrum radios, installed onboard trains, at wayside locations, and at control stations, to determine train locations and reliably transfer control information. Sandia National Laboratories has worked cooperatively with BART to develop a simulator of the train control and power consumption of the AATC system. We are now in the process of developing enhanced train control algorithms to supplement the safety critical controller in order to smooth out train trajectories through coordinated control of multiple trains, and to reduce energy consumption and power infrastructure requirements. The control algorithms so far considered include (1) reducing peak power consumption to avoid voltage sags, especially during an outage or while clearing a backup, (2) rapid and smooth recovery from a backup, (3) avoiding oscillations due to train interference, (4) limiting needle peaks in power demand at substations to some specified level, (5) coasting, and (6) coordinating train movement, e.g. starts/stops and hills. C1 Sandia Natl Labs, Livermore, CA 94551 USA. RP Gordon, SP (reprint author), Sandia Natl Labs, MS 9201,POB 969, Livermore, CA 94551 USA. NR 0 TC 20 Z9 20 U1 1 U2 1 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 0-7803-4853-2 PY 1998 BP 165 EP 176 DI 10.1109/RRCON.1998.668103 PG 12 WC Engineering, Electrical & Electronic; Engineering, Mechanical; Transportation SC Engineering; Transportation GA BK89Y UT WOS:000073834700020 ER PT S AU Wessendorf, KO AF Wessendorf, KO GP IEEE IEEE TI The active bridge oscillator SO PROCEEDINGS OF THE 1998 IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM SE PROCEEDINGS OF THE IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM LA English DT Proceedings Paper CT IEEE International Frequency Control Symposium CY MAY 27-29, 1998 CL PASADENA, CA SP IEEE, Ultrasonics Ferroelectr & Frequency Control Soc C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Wessendorf, KO (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1075-6787 BN 0-7803-4373-5 J9 P IEEE INT FREQ CONT PY 1998 BP 361 EP 369 DI 10.1109/FREQ.1998.717929 PG 9 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA BL72D UT WOS:000076440400062 ER PT S AU Ives, RW Eichel, P Magotra, N AF Ives, RW Eichel, P Magotra, N GP IEEE TI Intelligent low rate compression of speckled SAR imagery SO PROCEEDINGS OF THE 1998 IEEE RADAR CONFERENCE: RADARCON 98 SE Radar Conference LA English DT Proceedings Paper CT IEEE Radar Conference on Challenges in Radar Systems and Solutions CY MAY 11-14, 1998 CL DALLAS, TX SP IEEE, Aerosp & Electr Syst, IEEE, AESS, Dallas Sect AB This paper describes a compression technique under development at Sandia National Laboratories for the compression of complex synthetic aperture radar (SAR) imagery at very low overall bit rates. The methods involved combine several elements of existing and new lossy and lossless compression schemes in order to achieve an overall compression ratio of large SAR scenes of at least 50:1, while maintaining reasonable image quality. It is assumed that the end user will be primarily interested in specific regions of interest within the image (called "chips"), but that the context in which these chips appear within the entire scene is also of importance to an image analyst. The: term "intelligent" is used to signify an external cuer which locates the chips of interest. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Ives, RW (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1097-5764 BN 0-7803-4492-8 J9 RADAR CONF PY 1998 BP 239 EP 244 DI 10.1109/NRC.1998.678007 PG 6 WC Engineering, Aerospace; Engineering, Electrical & Electronic SC Engineering GA BL12P UT WOS:000074378700040 ER PT S AU Hummel, JR Russell, L AF Hummel, JR Russell, L BE Obaidat, MS Davoli, F DeMarinis, D TI An evaluation of smalltalk, C++, and Ada95 for use in a major DoD application SO PROCEEDINGS OF THE 1998 SUMMER COMPUTER SIMULATION CONFERENCE: SIMULATION AND MODELING TECHNOLOGY FOR THE TWENTY-FIRST CENTURY SE PROCEEDINGS OF THE SUMMER COMPUTER SIMULATION CONFERENCE LA English DT Proceedings Paper CT 1998 Summer Computer Simulation Conference on Simulation and Modeling Technology for the 21st-Century CY JUL 19-22, 1998 CL RENO, NV SP Soc Comp Simulat Int DE smalltalk; C++; Ada95; programming languages; object-oriented AB The choice of a programming language can have a significant impact on the development of effective software. Numerous programming languages are available in the computer science community and supporters of specific languages often defend their choices with a religious zeal. Argonne National Laboratory (ANL) was recently tasked to assist in the selection of a programming language and development environment for a major DoD software development effort. Three candidate programming languages were identified by the sponsor for evaluation: Smalltalk, C++, and Ada95. (At the time the evaluation was performed, Java was regarded as being too immature.) Smalltalk is a pure object-oriented language that was originally developed by Xerox. C++ originated at AT&T and is not a pure object-oriented language. Ada95 is an object-oriented version of Ada, a language that was developed to support the defense community. The purpose of this paper is to describe the process that was used to evaluate the three languages and to describe the results of the evaluation. C1 Argonne Natl Lab, Decis & Informat Sci Div, Argonne, IL 60439 USA. RP Hummel, JR (reprint author), Argonne Natl Lab, Decis & Informat Sci Div, 9700 S Cass Ave,Bldg 900, Argonne, IL 60439 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU SOC COMPUTER SIMULATION PI SAN DIEGO PA PO BOX 17900, SAN DIEGO, CA 92177 USA SN 0094-7474 BN 1-56555-149-4 J9 P SUMM COMP PY 1998 BP 542 EP 547 PG 6 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods; Engineering, Multidisciplinary SC Computer Science; Engineering GA BM99N UT WOS:000080377000087 ER PT S AU Anderson, LE AF Anderson, LE BE Chang, HK Zhang, YT TI Biological effects of magnetic fields: Laboratory studies SO PROCEEDINGS OF THE 20TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOL 20, PTS 1-6: BIOMEDICAL ENGINEERING TOWARDS THE YEAR 2000 AND BEYOND SE PROCEEDINGS OF ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY LA English DT Proceedings Paper CT 10th Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society CY OCT 29-NOV 01, 1998 CL HONG KONG, PEOPLES R CHINA SP IEEE Engn Med & Biol Soc ID 60-HZ ELECTRIC-FIELDS; FREQUENCY ELECTROMAGNETIC-FIELDS; RAT-LIVER FOCI; DEVELOPMENTAL TOXICITY; TUMOR-DEVELOPMENT; CHRONIC EXPOSURE; PINEAL FUNCTION; BREAST-CANCER; MOUSE-SKIN; WEAK AB There is now a reasonable battery of evidence from a large number of laboratories, that exposure to extremely low frequency magnetic and electric fields (EMF) produces biological responses in animals. Many of the observed effects appear to be directly or indirectly associated with the neural or neuroendocrine systems. Such effects include increased neuronal excitability, chemical and hormonal changes in the nervous system, altered behavioral responses, some of which are related to sensing the presence of the field, and changes in endogenous biological rhythms. Bone growth and fracture repair clearly show evidence of effects by exposure to magnetic fields of sufficient intensity. Additional indices of general physiological status appear relatively unaffected by exposure, although effects have occasionally been described in reproduction and development and immune system function A major focus of ongoing research in the laboratory is to determine whether the epidemiological-based suggested association between magnetic field exposure and risk of cancer can be supported in studies using animal models. Three major challenges exist for ongoing laboratory research: 1) knowledge about the mechanisms underlying observed bioeffects is incomplete, 2) understanding of the physical aspects of exposure and the dose that produce biological responses is not currently available, and 3) health consequences resulting from EMF exposure are primarily speculative. There is presently no clear and convincing evidence from animal or cellular studies that demonstrates deleterious effects of EMF. There are, however, some studies, though largely unreplicated, that are suggestive of potential health impacts. From the perspective of laboratory studies, this presentation will discuss biological responses to extremely low frequency magnetic field exposures. C1 Battelle Mem Inst, Pacific NW Labs, Bioelectromagnet Environm & Hlth Sci Div, Richland, WA 99352 USA. RP Anderson, LE (reprint author), Battelle Mem Inst, Pacific NW Labs, Bioelectromagnet Environm & Hlth Sci Div, POB 999, Richland, WA 99352 USA. EM larry.anderson@pnl.gov NR 53 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1094-687X BN 0-7803-5164-9 J9 P ANN INT IEEE EMBS PY 1998 VL 20 BP 2791 EP 2797 PN 1-6 PG 7 WC Cardiac & Cardiovascular Systems; Engineering, Biomedical; Medical Informatics; Medical Laboratory Technology; Clinical Neurology; Radiology, Nuclear Medicine & Medical Imaging SC Cardiovascular System & Cardiology; Engineering; Medical Informatics; Medical Laboratory Technology; Neurosciences & Neurology; Radiology, Nuclear Medicine & Medical Imaging GA BM59Y UT WOS:000079210400763 ER PT B AU Torcellini, PA Hayter, SJ Ketcham, MS Judkoff, R AF Torcellini, PA Hayter, SJ Ketcham, MS Judkoff, R BE CampbellHowe, R Cortez, T WilkinsCrowder, B TI Performance of a low-energy commercial building designed using a whole-building approach SO PROCEEDINGS OF THE 23RD NATIONAL PASSIVE SOLAR CONFERENCE SE PROCEEDINGS OF THE NATIONAL PASSIVE SOLAR CONFERENCE LA English DT Proceedings Paper CT 23rd National Passive Solar Conference CY JUN 14-17, 1998 CL ALBUQUERQUE, NM SP Amer Solar Energy Soc, US DOE, Org Amer States, Sandia Natl Labs, Univ New Mexico, NationsBank, New Mexico Land Off, DOE, Albuquerque Operat Off, Public Serv Co New Mexico, New Mexico Energy Off AB The Thermal Test Facility (TTF) at the National Renewable Energy Laboratory (NREL) in Golden, Colorado, demonstrates that using a whole-building design approach successfully produces an extremely low-energy building. A whole-building approach treats a building as a single unit not a shell containing many separate systems. By using this approach for the TTF, the team of NREL researchers and designers produced a building that costs 63% less to operate than a code-compliant basecase building. These savings were achieved by implementing an approach that optimized passive solar technologies and integrated energy-efficient building systems. Passive solar technologies included daylighting, high-efficiency lighting systems, engineered overhangs, direct solar gains for heating, thermal mass building materials, managed glazing, and a good thermal envelope. The energy-efficient HVAC system, designed to work with the building's passive solar technologies, includes ventilation air preheat, ceiling fans, indirect/direct evaporative cooling, and an automatic control system. This paper presents results of tests conducted since the building's completion in 1996 that demonstrate the success of the TTF's design. Modeling building energy performance, calibrating those models, and monitoring building performance will be discussed. C1 Ctr Bldg & Thermal Syst, Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Torcellini, PA (reprint author), Ctr Bldg & Thermal Syst, Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 6 TC 0 Z9 0 U1 0 U2 3 PU AMERICAN SOLAR ENERGY SOCIETY INC PI BOULDER PA 2400 CENTRAL AVE, SUITE G-1, BOULDER, CO 80301 USA BN 0-89553-213-1 J9 P NATL SOL PY 1998 VL 23 BP 33 EP 38 PG 4 WC Construction & Building Technology; Energy & Fuels SC Construction & Building Technology; Energy & Fuels GA BQ56E UT WOS:000088763600006 ER PT B AU Crawley, DB Pedersen, CO Winkelmann, FC Lawrie, LK AF Crawley, DB Pedersen, CO Winkelmann, FC Lawrie, LK BE CampbellHowe, R Cortez, T WilkinsCrowder, B TI Energyplus: The new generation energy simulation program beyond blast and DOE-2 SO PROCEEDINGS OF THE 23RD NATIONAL PASSIVE SOLAR CONFERENCE SE PROCEEDINGS OF THE NATIONAL PASSIVE SOLAR CONFERENCE LA English DT Proceedings Paper CT 23rd National Passive Solar Conference CY JUN 14-17, 1998 CL ALBUQUERQUE, NM SP Amer Solar Energy Soc, US DOE, Org Amer States, Sandia Natl Labs, Univ New Mexico, NationsBank, New Mexico Land Off, DOE, Albuquerque Operat Off, Public Serv Co New Mexico, New Mexico Energy Off AB Many existing building energy simulation programs around the world are reaching maturity. They use simulation methods land even code) that originated in the 1960s. For more than two decades, the US government has developed two hourly building energy simulation programs, DOE-2 and BLAST. Without substantial redesign and recoding, expanding their capabilities has become difficult, time-consuming, and expensive. During the same time, recent advances in analysis and computational methods and power have increased the opportunity for significant improvements in these tools. In early 1996, a federal agency began developing a new building energy simulation tool, EnergyPlus, building on development experience with two existing programs: DOE-2 and BLAST. Beta testing of EnergyPlus begins in 1998. EnergyPlus will include innovative simulation features including variable time steps, built-in template and external modular systems that are integrated with a heat balance-based zone simulation, and input and output data structures tailored to facilitate third party interface development. Other simulation capabilities planned for the first release include multizone airflow, and electric power and solar thermal and photovoltaic simulation. C1 US Dept Energy, Washington, DC 20585 USA. RP Crawley, DB (reprint author), US Dept Energy, 1000 Independence Ave SW, Washington, DC 20585 USA. NR 4 TC 0 Z9 0 U1 1 U2 1 PU AMERICAN SOLAR ENERGY SOCIETY INC PI BOULDER PA 2400 CENTRAL AVE, SUITE G-1, BOULDER, CO 80301 USA BN 0-89553-213-1 J9 P NATL SOL PY 1998 VL 23 BP 243 EP 248 PG 4 WC Construction & Building Technology; Energy & Fuels SC Construction & Building Technology; Energy & Fuels GA BQ56E UT WOS:000088763600039 ER PT B AU Balcomb, JD Beeler, G AF Balcomb, JD Beeler, G BE CampbellHowe, R Cortez, T WilkinsCrowder, B TI Designing low-energy buildings with ENERGY-10 SO PROCEEDINGS OF THE 23RD NATIONAL PASSIVE SOLAR CONFERENCE SE PROCEEDINGS OF THE NATIONAL PASSIVE SOLAR CONFERENCE LA English DT Proceedings Paper CT 23rd National Passive Solar Conference CY JUN 14-17, 1998 CL ALBUQUERQUE, NM SP Amer Solar Energy Soc, US DOE, Org Amer States, Sandia Natl Labs, Univ New Mexico, NationsBank, New Mexico Land Off, DOE, Albuquerque Operat Off, Public Serv Co New Mexico, New Mexico Energy Off AB Low-energy building design works best through a process that starts with energy calculations in predesign that identify the best energy-saving opportunities and continues with follow-up calculations as the design proceeds. An example of this process was the design of the Environmental Technology Center for the Sonoma State University in California. The ENERGY-10 design-tool computer program proved to be ideally suited for the purpose, providing critical information quickly and at an early stage. Starting with a goal to reduce energy consumption by 80% below the regulated maximum, ENERGY-10 identified strategies that approached the goal even before design was initiated. The paper tracks the use of ENERGY-10 through the design process. At the end of schematic design, ENERGY-10 calculations confirmed that the goal of 16800 Btu/ft(2) had been attained-an extremely low-energy building. Design drawings and simulation results are presented. Construction will start in 1998. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Balcomb, JD (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN SOLAR ENERGY SOCIETY INC PI BOULDER PA 2400 CENTRAL AVE, SUITE G-1, BOULDER, CO 80301 USA BN 0-89553-213-1 J9 P NATL SOL PY 1998 VL 23 BP 277 EP 282 PG 4 WC Construction & Building Technology; Energy & Fuels SC Construction & Building Technology; Energy & Fuels GA BQ56E UT WOS:000088763600045 ER PT S AU Driessen, BJ Sadegh, N Kwok, KS AF Driessen, BJ Sadegh, N Kwok, KS GP IEEE IEEE TI A robust line search for learning control SO PROCEEDINGS OF THE 37TH IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-4 SE IEEE CONFERENCE ON DECISION AND CONTROL - PROCEEDINGS LA English DT Proceedings Paper CT 37th IEEE Conference on Decision and Control CY DEC 16-18, 1998 CL TAMPA, FL SP IEEE Control Syst Soc, Soc Ind & Appl Math, Inst Operat Res & Management Sci ID ROBOTS AB In this paper a new line search for a Newton Rhapson learning control algorithm is presented. Theorems and rigorous proofs of its increased robustness over existing line searches are provided, and numerical examples are used to further validate the theorems. Also, the previously posed open question of whether robust optimal trajectory learning is possible is also addressed. It is shown that the answer is generally no, at least for gradient-based learning control algorithms. C1 Sandia Natl Labs, Struct Dynam Dept, Albuquerque, NM 87185 USA. RP Driessen, BJ (reprint author), Sandia Natl Labs, Struct Dynam Dept, POB 5800, Albuquerque, NM 87185 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0191-2216 BN 0-7803-4394-8 J9 IEEE DECIS CONTR P PY 1998 BP 3888 EP 3892 PG 5 WC Automation & Control Systems; Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic; Operations Research & Management Science; Mathematics, Applied SC Automation & Control Systems; Computer Science; Engineering; Operations Research & Management Science; Mathematics GA BM76E UT WOS:000079708900753 ER PT B AU Zhang, Y Sperber, KR Boyle, JS AF Zhang, Y Sperber, KR Boyle, JS BE Chang, CP Chan, JCL Wang, JT TI Interannual variation of East Asian winter monsoon and ENSO SO PROCEEDINGS OF THE 3RD INTERNATIONAL CONFERENCE ON EAST ASIA AND WESTERN PACIFIC METEOROLOGY AND CLIMATE LA English DT Proceedings Paper CT 3rd International Conference on East Asia and Western Pacific Meteorology and Climate CY MAY 16-18, 1996 CL CHUNGLI, TAIWAN AB This paper examines the interannual variation of the East Asian winter monsoon and its relationship with ENSO based on the 1979-1995 NCEP/NCAR reanalysis. Two stratifications of cold surges are used. The first one, described as the conventional cold surges, indicates that the surge frequency reaches a minimum one year after EI Ni (n) over tilde o events. The second one, originated from the same region as the first, is defined as the maximum wind events near the South China Sea. The variation of this stratification of surges is found to be in good agreement with the Southern Oscillation Index (SOI). Low SOI (high SOI) events coincide with years of low (high) surge frequency. The interannual variation of averaged meridional wind near the South China Sea and western pacific is dominated by the South China Sea cold surges, and is also well correlated (R = 0.82) with the SOI. Strong wind seasons are associated with La Nina and high SOI events; likewise, weak wind years are linked with El Nino and low SOI cases. This pattern is restricted north of the equator within the region of (0 degrees N-20 degrees N, 110 degrees E-130 degrees E), and is confined to the near surface layer. The surface Siberian high, 500 hPa trough and 200 hPa jetstream, all representing the large-scale monsoon flow, are found to be weaker than normal during El Nine years. In particular, the interannual variation of the Siberian high is in general agreement with the SOI. C1 Univ Calif Lawrence Livermore Natl Lab, Program Climate Model Diag & Intercomparison, Livermore, CA 94550 USA. RP Zhang, Y (reprint author), Univ Calif Lawrence Livermore Natl Lab, Program Climate Model Diag & Intercomparison, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3047-8 PY 1998 BP 496 EP 505 PG 10 WC Meteorology & Atmospheric Sciences; Oceanography SC Meteorology & Atmospheric Sciences; Oceanography GA BM06A UT WOS:000077489700068 ER PT B AU Jody, BJ Daniels, EJ Wolsky, AM AF Jody, BJ Daniels, EJ Wolsky, AM BE McBride, AE TI Methods to reduce Co-2 release to the atmosphere SO PROCEEDINGS OF THE AMERICAN POWER CONFERENCE, VOL. 60, PTS I & II LA English DT Proceedings Paper CT 60th Annual Meeting of the American-Power-Conference CY 1998 CL CHICAGO, IL SP Illinois Inst Technol C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Jody, BJ (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER POWER CONFERENCE ILLINOIS INST TECHNOLOGY PI CHICAGO PA CHICAGO, IL 60616 USA PY 1998 BP 27 EP 32 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BL05Q UT WOS:000074129000007 ER PT B AU Kavicky, JA Shahidehpour, SM AF Kavicky, JA Shahidehpour, SM BE McBride, AE TI Characterizing and modeling subarea-level energy transactions SO PROCEEDINGS OF THE AMERICAN POWER CONFERENCE, VOL. 60, PTS I & II LA English DT Proceedings Paper CT 60th Annual Meeting of the American-Power-Conference CY 1998 CL CHICAGO, IL SP Illinois Inst Technol AB This paper describes the application of an electrical network characterization method to an optimization model that is designed to simulate subarea-level energy transactions. The network characterization method determines subarea clusters of sq stem busts that electrically respond to perturbations in a very similar manner. The method produces a reduced number of transmission constraints and preserves parallel path representations. The least-cost, linear programming (LP) formulation takes advantage of data reduction techniques to simplify model transmission constraints, while supporting parallel path system characteristics and energy tagging of subarea transactions. An overview of the proposed method describes :he problem domain and key model features. The paper then presents two model applications that illustrate generator siting and line overload screening analyses. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Kavicky, JA (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER POWER CONFERENCE ILLINOIS INST TECHNOLOGY PI CHICAGO PA CHICAGO, IL 60616 USA PY 1998 BP 441 EP 445 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BL05Q UT WOS:000074129000081 ER PT B AU Layne, AW Hoffman, PA AF Layne, AW Hoffman, PA BE McBride, AE TI The US department of energy's advanced turbine systems program SO PROCEEDINGS OF THE AMERICAN POWER CONFERENCE, VOL. 60, PTS I & II LA English DT Proceedings Paper CT 60th Annual Meeting of the American-Power-Conference CY 1998 CL CHICAGO, IL SP Illinois Inst Technol AB Advanced Turbine Systems (ATS) technology can capture the majority of the new electric power generation market well into the next century. U.S. Department of Energy (DOE) programs supporting the development of ATS technology will enable gas turbine manufacturers to provide ATS systems to the commercial marketplace by the year 2000. We present a progress report on the DOE ATS Program. We discuss the technical challenges facing the Program and the advanced critical technology requirements and system configurations needed to meet the goals of the Program. Progress has been made in the areas of materials, heat transfer, aerodynamics, and combustion. Applied research conducted by university, industry, and Government organizations has resulted in advanced designs and power cycle configurations for ATS that operate on natural gas, coal, and biomass fuels. We present details on ATS Program research and development (R&D), technology validation and readiness activities. We conclude by discussing the future direction of the Program and its relationship to other Government programs. C1 US DOE, Fed Energy Technol Ctr, Morgantown, WV 26507 USA. RP Layne, AW (reprint author), US DOE, Fed Energy Technol Ctr, POB 880, Morgantown, WV 26507 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER POWER CONFERENCE ILLINOIS INST TECHNOLOGY PI CHICAGO PA CHICAGO, IL 60616 USA PY 1998 BP 596 EP 601 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BL05Q UT WOS:000074129000111 ER PT B AU Freier, MD Goldstein, HN Swensen, EC AF Freier, MD Goldstein, HN Swensen, EC BE McBride, AE TI Repowering with an integrated gasification-cascaded humidified advanced turbine (IG-CHAT) cycle SO PROCEEDINGS OF THE AMERICAN POWER CONFERENCE, VOL. 60, PTS I & II LA English DT Proceedings Paper CT 60th Annual Meeting of the American-Power-Conference CY 1998 CL CHICAGO, IL SP Illinois Inst Technol C1 US DOE, Morgantown, WV USA. RP Freier, MD (reprint author), US DOE, Morgantown, WV USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER POWER CONFERENCE ILLINOIS INST TECHNOLOGY PI CHICAGO PA CHICAGO, IL 60616 USA PY 1998 BP 602 EP 607 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BL05Q UT WOS:000074129000112 ER PT B AU Nusbaum, AW AF Nusbaum, AW GP ARMA ARMA TI Developing your line of sight: Formulating mission, goals, and plans that work for you SO PROCEEDINGS OF THE ARMA INTERNATIONAL 43RD ANNUAL CONFERENCE LA English DT Proceedings Paper CT 43rd Annual Conference of ARMA International CY OCT 04-07, 1998 CL HOUSTON, TX SP ARMA Int C1 Sandia Natl Labs, CRM, Livermore, CA 94550 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU ASSOC RECORDS MANAGERS & ADMINISTRATORS PI PRAIRIE VILLAGE PA 4200 SOMERSET DRIVE, SUITE 215, PRAIRIE VILLAGE, KS 66208 USA BN 0-933887-82-5 PY 1998 BP 323 EP 335 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA BQ47F UT WOS:000088436800044 ER PT S AU McKoon, RH AF McKoon, RH BE Bakish, R TI Decarburization of uranium via electron beam processing SO PROCEEDINGS OF THE CONFERENCE ON ELECTRON BEAM MELTING AND REFINING - STATE OF THE ART 1998 SE PROCEEDINGS OF THE CONFERENCE ON ELECTRON BEAM MELTING AND REFINING - STATE OF THE ART LA English DT Proceedings Paper CT 15th Electron Beam Melting and Refining - State of the Art 1998 Conference CY OCT, 1998 CL RENO, NV AB For many commercial and military applications, the successive Vacuum Induction Melting of uranium metal in graphite crucibles results in a product which is out of specification in carbon. The current recovery method involves dissolution of the metal in acid and chemical purification. This is both expensive and generates mixed waste. A study was undertaken at Lawrence Livermore national Laboratory to investigate the feasibility of reducing the carbon content of uranium metal using electron beam techniques. Results will be presented on the rate and extent of carbon removal as a function of various operating parameters. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP McKoon, RH (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BAKISH MATERIALS CORP PI ENGLEWOOD PA PO BOX 148, ENGLEWOOD, NJ 07631 USA SN 0740-8706 J9 P C ELECT B PY 1998 BP 170 EP 176 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Condensed Matter; Physics, Particles & Fields SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA BN49Q UT WOS:000082034200017 ER PT S AU Braun, DG Anklam, TM Berzins, LV Blackfield, DT McClelland, MA Meier, TC Westerberg, KW Boyd, I Balakrishnan, J AF Braun, DG Anklam, TM Berzins, LV Blackfield, DT McClelland, MA Meier, TC Westerberg, KW Boyd, I Balakrishnan, J BE Bakish, R TI Simulation of an EBPVD titanium vapor plume and comparison to experiment SO PROCEEDINGS OF THE CONFERENCE ON ELECTRON BEAM MELTING AND REFINING - STATE OF THE ART 1998 SE PROCEEDINGS OF THE CONFERENCE ON ELECTRON BEAM MELTING AND REFINING - STATE OF THE ART LA English DT Proceedings Paper CT 15th Electron Beam Melting and Refining - State of the Art 1998 Conference CY OCT, 1998 CL RENO, NV ID GUN AB A 2 dimensional vapor code has been used to simulate the electron-beam vaporization of Titanium and its subsequent deposition on a horizontal substrate in experiments performed at Lawrence Livermore National Laboratory (LLNL). Previous work has modeled the Titanium melt. Using those results, the present work models the expansion of the atomic vapor from the melt surface to the substrate. The flow speed of the vapor expansion and its kinetic and internal temperatures were measured in the LLNL experiment as a function of the vaporization rate and the electron-beam footprint. The deposition profile on the substrate was also measured post-run. This work describes the experimental configuration and compares the measured quantities to those of the computer simulation. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Braun, DG (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94550 USA. NR 12 TC 0 Z9 0 U1 1 U2 1 PU BAKISH MATERIALS CORP PI ENGLEWOOD PA PO BOX 148, ENGLEWOOD, NJ 07631 USA SN 0740-8706 J9 P C ELECT B PY 1998 BP 177 EP 194 PG 18 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Condensed Matter; Physics, Particles & Fields SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA BN49Q UT WOS:000082034200018 ER PT B AU Dai, S Toth, LM AF Dai, S Toth, LM BE Trulove, PC DeLong, HC Stafford, GR Deki, S TI Photochemistry of uranium(V) hexachloride complex in acidic room temperature molten salts SO PROCEEDINGS OF THE ELEVENTH INTERNATIONAL SYMPOSIUM ON MOLTEN SALTS XI SE ELECTROCHEMICAL SOCIETY SERIES LA English DT Proceedings Paper CT 11th International Symposium on Molten Salts at the 193rd Meeting of the Electrochemical-Society CY MAY 03-09, 1998 CL SAN DIEGO, CA SP Electrochem Soc, Phys Electrochem Div, Electrochem Soc, High Temp Mat Div, Electrochem Soc, Electrodeposit Div, USAF, Off Sci Res AB Photochemistry of uranium(V) was investigated for the first time. This investigation indicated that U(V) chloride complex can be facilely photoreduced to the the corresponding U(IV) complex in an acidic room-temperature melt under photolysis. C1 Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. RP Dai, S (reprint author), Oak Ridge Natl Lab, Div Chem Technol, POB 2008, Oak Ridge, TN 37831 USA. RI Dai, Sheng/K-8411-2015 OI Dai, Sheng/0000-0002-8046-3931 NR 0 TC 3 Z9 3 U1 0 U2 4 PU ELECTROCHEMICAL SOCIETY INC PI PENNINGTON PA 65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA BN 1-56677-205-2 J9 ELEC SOC S PY 1998 VL 98 IS 11 BP 261 EP 265 PG 5 WC Chemistry, Multidisciplinary; Electrochemistry; Engineering, Chemical; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Engineering; Materials Science GA BL94E UT WOS:000077242400025 ER PT B AU Costa, DA Smith, WH AF Costa, DA Smith, WH BE Trulove, PC DeLong, HC Stafford, GR Deki, S TI The chemical and electrochemical behavior of uranyl chloride in RTMS melts SO PROCEEDINGS OF THE ELEVENTH INTERNATIONAL SYMPOSIUM ON MOLTEN SALTS XI SE ELECTROCHEMICAL SOCIETY SERIES LA English DT Proceedings Paper CT 11th International Symposium on Molten Salts at the 193rd Meeting of the Electrochemical-Society CY MAY 03-09, 1998 CL SAN DIEGO, CA SP Electrochem Soc, Phys Electrochem Div, Electrochem Soc, High Temp Mat Div, Electrochem Soc, Electrodeposit Div, USAF, Off Sci Res AB The chemistry of uranyl chloride in acidic room temperature molten salt (RTMS) systems has been studied by electrochemistry and by UV-Vis absorption spectroscopy. Over the course of several hours the uranium (VI) uranyl species (UO22+) is transformed into a uranium (V) chloride. A mechanism for this process based on an initial acid-base reaction between the Lewis acidic Al2Cl7- and the Lewis basic uranyl oxygens, followed by reduction of the free U (VI) to U (V) by the solvent is proposed. Initial results indicating a photosensitivity of the uranyl species in both basic and acidic EMIC/AlCl3 melts are also presented. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Costa, DA (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. NR 0 TC 2 Z9 2 U1 1 U2 4 PU ELECTROCHEMICAL SOCIETY INC PI PENNINGTON PA 65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA BN 1-56677-205-2 J9 ELEC SOC S PY 1998 VL 98 IS 11 BP 266 EP 277 PG 12 WC Chemistry, Multidisciplinary; Electrochemistry; Engineering, Chemical; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Engineering; Materials Science GA BL94E UT WOS:000077242400026 ER PT B AU Henriksen, G Kaun, T Jansen, A Prakash, J Vissers, D AF Henriksen, G Kaun, T Jansen, A Prakash, J Vissers, D BE Trulove, PC DeLong, HC Stafford, GR Deki, S TI Advanced cell technology for high performance Li-Al/Fes(2) secondary batteries SO PROCEEDINGS OF THE ELEVENTH INTERNATIONAL SYMPOSIUM ON MOLTEN SALTS XI SE ELECTROCHEMICAL SOCIETY SERIES LA English DT Proceedings Paper CT 11th International Symposium on Molten Salts at the 193rd Meeting of the Electrochemical-Society CY MAY 03-09, 1998 CL SAN DIEGO, CA SP Electrochem Soc, Phys Electrochem Div, Electrochem Soc, High Temp Mat Div, Electrochem Soc, Electrodeposit Div, USAF, Off Sci Res AB In early 1993, Argonne National Laboratory (ANL) initiated a major R&D effort to develop bipolar Li-Al/LiCl-LiBr-KBr/FeS2 batteries for electric vehicles, targeting the USABC Long-Term Goals. Significant advancements were achieved in the areas of (i) chemical purity, (ii) electrode and electrolyte additives, and (iii) peripheral seals. It was determined that key chemical constituents contained undesirable impurities. ANL developed new chemical processes for preparing Li2S, FeS, and CoS2 that were >98.5% pure. We evaluated a large variety of electrode and electrolyte additives for reducing cell area specific impedance (ASI). Candidate positive electrode additives offered increased electronic conductivity, enhanced reaction kinetics, and/or improved porous electrode morphology. CoS2, CuFeS2, MgO, and graphite (fibers) were identified as the most beneficial impedance-reducing positive electrode additives. Although electronically conductive carbon and graphite additives produced measurable ASI reductions in the negative electrode, they degraded its structural integrity and were deemed impractical. Lil and LIF were identified as beneficial electrolyte additives, that enhance positive electrode kinetics. ANL refined its baseline metal/ceramic peripheral seal and increased its strength by a factor of three (achieving a safety factor >10). In parallel, ANL developed a high-strength advanced metal/ceramic seal that offers appreciable cost reductions. C1 Argonne Natl Lab, Electrochem Technol Program, Argonne, IL 60439 USA. RP Henriksen, G (reprint author), Argonne Natl Lab, Electrochem Technol Program, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 1 Z9 1 U1 1 U2 6 PU ELECTROCHEMICAL SOCIETY INC PI PENNINGTON PA 65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA BN 1-56677-205-2 J9 ELEC SOC S PY 1998 VL 98 IS 11 BP 302 EP 315 PG 14 WC Chemistry, Multidisciplinary; Electrochemistry; Engineering, Chemical; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Engineering; Materials Science GA BL94E UT WOS:000077242400029 ER PT B AU Guidotti, RA Reinhardt, FW AF Guidotti, RA Reinhardt, FW BE Trulove, PC DeLong, HC Stafford, GR Deki, S TI Characterization of low-melting electrolytes for potential geothermal borehole power supplies: The LiBr-KBr-LiF EUTECTIC SO PROCEEDINGS OF THE ELEVENTH INTERNATIONAL SYMPOSIUM ON MOLTEN SALTS XI SE ELECTROCHEMICAL SOCIETY SERIES LA English DT Proceedings Paper CT 11th International Symposium on Molten Salts at the 193rd Meeting of the Electrochemical-Society CY MAY 03-09, 1998 CL SAN DIEGO, CA SP Electrochem Soc, Phys Electrochem Div, Electrochem Soc, High Temp Mat Div, Electrochem Soc, Electrodeposit Div, USAF, Off Sci Res AB The suitability of modified thermal-battery technology for use as a potential power source for geothermal borehole applications is under investigation. As a first step, the discharge processes that take place in LiSi/LiBr-KBr-LiF/FeS2 thermal cells were studied at temperatures of 350 degrees C and 400 degrees C using pelletized cells with immobilized electrolyte. Incorporation of a reference electrode allowed the relative contribution of each electrode to the overall cell polarization to be determined. The results of single-cell tests are presented, along with preliminary data for cells based on a lower-melting CsBr-LiBr-KBr eutectic salt. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Guidotti, RA (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 3 Z9 3 U1 1 U2 2 PU ELECTROCHEMICAL SOCIETY INC PI PENNINGTON PA 65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA BN 1-56677-205-2 J9 ELEC SOC S PY 1998 VL 98 IS 11 BP 316 EP 324 PG 9 WC Chemistry, Multidisciplinary; Electrochemistry; Engineering, Chemical; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Engineering; Materials Science GA BL94E UT WOS:000077242400030 ER PT B AU Baboul, AG Curtiss, LA Saboungi, ML Ansell, S Mao, G Price, DL AF Baboul, AG Curtiss, LA Saboungi, ML Ansell, S Mao, G Price, DL BE Trulove, PC DeLong, HC Stafford, GR Deki, S TI Density functional and neutron studies of lithium polymer electrolytes SO PROCEEDINGS OF THE ELEVENTH INTERNATIONAL SYMPOSIUM ON MOLTEN SALTS XI SE ELECTROCHEMICAL SOCIETY SERIES LA English DT Proceedings Paper CT 11th International Symposium on Molten Salts at the 193rd Meeting of the Electrochemical-Society CY MAY 03-09, 1998 CL SAN DIEGO, CA SP Electrochem Soc, Phys Electrochem Div, Electrochem Soc, High Temp Mat Div, Electrochem Soc, Electrodeposit Div, USAF, Off Sci Res AB The structure of PEO doped with lithium perchlorate has been determined using neutron diffraction on protonated and deuterated samples. The experiments were done in the liquid state. Preliminary analysis indicates the Li-O distance is about 2.0 Angstrom. The geometries of a series of gas phase lithium salts [LiCF3SO3, Li(CF3SO2)(2)N, Li(CF3SO2)(2)CH, LiClO4, LiPF6, LiAsF6] used in polymer electrolytes have been optimized at B3LYP/6-31G(d) density functional level of theory. All local minima have been identified. For the triflate, imide, methanide, and perchlorate anions, the lithium cation is coordinated to two oxygens and have binding energies of ca. 141 kcal/mol at the B3LYP/6-311+G(3df,2p)//B3LYP/6-31G* level of theory. For the hexafluoroarsenate and hexafluorophosphate the lithium cation is coordinated to three oxygens and have binding energies of ca. 136 kcal/mol. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Baboul, AG (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 1 Z9 1 U1 1 U2 3 PU ELECTROCHEMICAL SOCIETY INC PI PENNINGTON PA 65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA BN 1-56677-205-2 J9 ELEC SOC S PY 1998 VL 98 IS 11 BP 341 EP 350 PG 10 WC Chemistry, Multidisciplinary; Electrochemistry; Engineering, Chemical; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Engineering; Materials Science GA BL94E UT WOS:000077242400033 ER PT B AU Sofu, T Li, SX Wigeland, RA AF Sofu, T Li, SX Wigeland, RA BE Trulove, PC DeLong, HC Stafford, GR Deki, S TI Electric potential field calculations for the FCF Mark-IV electrorefiner SO PROCEEDINGS OF THE ELEVENTH INTERNATIONAL SYMPOSIUM ON MOLTEN SALTS XI SE ELECTROCHEMICAL SOCIETY SERIES LA English DT Proceedings Paper CT 11th International Symposium on Molten Salts at the 193rd Meeting of the Electrochemical-Society CY MAY 03-09, 1998 CL SAN DIEGO, CA SP Electrochem Soc, Phys Electrochem Div, Electrochem Soc, High Temp Mat Div, Electrochem Soc, Electrodeposit Div, USAF, Off Sci Res AB The electric potential field and resulting current densities are studied for the FCF Mark-IV electrorefiner during the direct transport mode of operation. The results are used in estimating primary current distributions and ohmic resistances between components of the electrorefiner for various cell configurations. Each configuration is analyzed for operation with a single power supply, dual anodes and serial cathodes, and dual power supplies. The effect of cathode deposit growth from a bare mandrel to a 10 " diameter cylinder is also studied. A comparison of the calculated results with data from initial electrorefiner experiments in direct transport mode indicates a good agreement for cell resistance and reference electrode readings at the beginning of an experiment. The difference between the calculated results and experimental data provides information regarding overpotentials that form on the surfaces of the electrorefiner components. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Sofu, T (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ELECTROCHEMICAL SOCIETY INC PI PENNINGTON PA 65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA BN 1-56677-205-2 J9 ELEC SOC S PY 1998 VL 98 IS 11 BP 385 EP 397 PG 13 WC Chemistry, Multidisciplinary; Electrochemistry; Engineering, Chemical; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Engineering; Materials Science GA BL94E UT WOS:000077242400038 ER PT B AU Dai, S Xiao, HM Young, JP AF Dai, S Xiao, HM Young, JP BE Trulove, PC DeLong, HC Stafford, GR Deki, S TI A confocal fiberoptic approach for windowless Raman spectral measurements of corrosive molten salts SO PROCEEDINGS OF THE ELEVENTH INTERNATIONAL SYMPOSIUM ON MOLTEN SALTS XI SE ELECTROCHEMICAL SOCIETY SERIES LA English DT Proceedings Paper CT 11th International Symposium on Molten Salts at the 193rd Meeting of the Electrochemical-Society CY MAY 03-09, 1998 CL SAN DIEGO, CA SP Electrochem Soc, Phys Electrochem Div, Electrochem Soc, High Temp Mat Div, Electrochem Soc, Electrodeposit Div, USAF, Off Sci Res AB Confocal fiberoptic techniques have been extended to measure Raman spectra of corrosive molten salts. Both molten carbonate and fluoride melts have been investigated via this technique. The unique confocal design also helps to eliminate the blackbody interference from the furnace. C1 Oak Ridge Natl Lab, Div Chem Technol, Oak Ridge, TN 37831 USA. RP Dai, S (reprint author), Oak Ridge Natl Lab, Div Chem Technol, POB 2008, Oak Ridge, TN 37831 USA. RI Dai, Sheng/K-8411-2015 OI Dai, Sheng/0000-0002-8046-3931 NR 0 TC 0 Z9 0 U1 2 U2 5 PU ELECTROCHEMICAL SOCIETY INC PI PENNINGTON PA 65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA BN 1-56677-205-2 J9 ELEC SOC S PY 1998 VL 98 IS 11 BP 592 EP 596 PG 5 WC Chemistry, Multidisciplinary; Electrochemistry; Engineering, Chemical; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Engineering; Materials Science GA BL94E UT WOS:000077242400058 ER PT B AU Wells, RF AF Wells, RF BE Tentner, A TI Implications of HPC and intelligent technology for global modeling and simulation SO PROCEEDINGS OF THE HIGH-PERFORMANCE COMPUTING (HPC'98) LA English DT Meeting Abstract CT 6th High Performance Computing Symposium on Grand Challenges in Computer Simulation at the 1998 Advanced Simulation Technologies Conference CY APR 05-09, 1998 CL BOSTON, MA SP Soc Comp Simulat Int C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Wells, RF (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC COMPUTER SIMULATION PI SAN DIEGO PA PO BOX 17900, SAN DIEGO, CA 92177 USA BN 1-56555-145-1 PY 1998 BP 3 EP 3 PG 1 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods; Engineering, Multidisciplinary SC Computer Science; Engineering GA BM99U UT WOS:000080386700001 ER PT B AU Hanebutte, UR Vitela, JE Gordillo, JL AF Hanebutte, UR Vitela, JE Gordillo, JL BE Tentner, A TI A parallel neural network training algorithm for control of discrete dynamical systems SO PROCEEDINGS OF THE HIGH-PERFORMANCE COMPUTING (HPC'98) LA English DT Proceedings Paper CT 6th High Performance Computing Symposium on Grand Challenges in Computer Simulation at the 1998 Advanced Simulation Technologies Conference CY APR 05-09, 1998 CL BOSTON, MA SP Soc Comp Simulat Int DE artificial Neural Network; training code; parallel computing; load balance; MPI; IBM SP; SGI Cray Origin 2000 AB In this work we present a parallel neural network controller training code, that uses MPI, a portable message passing environment. A comprehensive performance analysis is reported which compares results of a performance model with actual measurements. The analysis is made for three different load assignment schemes: block distribution, strip mining and a sliding average bin packing (best-fit) algorithm. Such analysis is crucial since optimal load balance can not be achieved because the work load information is not available a priori. The speedup results obtained with the above schemes are compared with those corresponding to the bin packing load balance scheme with perfect load prediction based on a priori knowledge of the computing effort. Two multiprocessor platforms: a SGI/Cray Origin 2000 and a IBM SP have been utilized for this study. It is shown that for the best load balance scheme a parallel efficiency of over 50% for the entire computation is achieved by 17 processors of either parallel computers. C1 Argonne Natl Lab, Reactor Anal Div, Argonne, IL 60439 USA. RP Hanebutte, UR (reprint author), Argonne Natl Lab, Reactor Anal Div, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 12 TC 0 Z9 0 U1 2 U2 2 PU SOC COMPUTER SIMULATION PI SAN DIEGO PA PO BOX 17900, SAN DIEGO, CA 92177 USA BN 1-56555-145-1 PY 1998 BP 81 EP 87 PG 7 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods; Engineering, Multidisciplinary SC Computer Science; Engineering GA BM99U UT WOS:000080386700014 ER PT B AU Nagel, K Rickert, M Frye, R Stretz, P Simon, P Jacob, R Barrett, CL AF Nagel, K Rickert, M Frye, R Stretz, P Simon, P Jacob, R Barrett, CL BE Tentner, A TI Regional transportation simulations SO PROCEEDINGS OF THE HIGH-PERFORMANCE COMPUTING (HPC'98) LA English DT Proceedings Paper CT 6th High Performance Computing Symposium on Grand Challenges in Computer Simulation at the 1998 Advanced Simulation Technologies Conference CY APR 05-09, 1998 CL BOSTON, MA SP Soc Comp Simulat Int DE transportation simulation; TRANSIMS; simulation of socio-economic systems ID MICROSIMULATION AB For transportation planning applications, it is useful to not only model each individual traveler, but also the decisionmaking process leading to her travel demand. Simulation-based modeling of this process means iterations between the actual transportation micro-simulation and the modules simulating the process making the plans. This means that for understanding a single day of travel, it may be necessary to simulate that day hundreds of times for the iteration process, leading to a considerable strain on computational resources. C1 Univ Calif Los Alamos Natl Lab, SA, DO, TSA, Los Alamos, NM 87545 USA. RP Nagel, K (reprint author), Univ Calif Los Alamos Natl Lab, SA, DO, TSA, Mail Stop M997, Los Alamos, NM 87545 USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU SOC COMPUTER SIMULATION PI SAN DIEGO PA PO BOX 17900, SAN DIEGO, CA 92177 USA BN 1-56555-145-1 PY 1998 BP 104 EP 109 PG 6 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods; Engineering, Multidisciplinary SC Computer Science; Engineering GA BM99U UT WOS:000080386700018 ER PT S AU Reece, WJ Blackman, HS AF Reece, WJ Blackman, HS GP HFES HFES HFES TI Cross-industry performance modeling: Toward cooperative analysis SO PROCEEDINGS OF THE HUMAN FACTORS AND ERGONOMICS SOCIETY 42ND ANNUAL MEETING, VOLS 1 AND 2 SE HUMAN FACTORS AND ERGONOMICS SOCIETY ANNUAL MEETING PROCEEDINGS LA English DT Proceedings Paper CT 42nd Annual Meeting of the Human-Factors-and-Ergonomics-Society CY OCT 05-09, 1998 CL CHICAGO, IL SP Human Factors & Ergon Soc AB One of the current unsolved problems in human factors is the difficulty in acquiring information from lessons learned and data collected among human performance analysts in different domains. There are several common concerns and generally accepted issues of importance for human factors, psychology and industry analysts of performance and safety. Among these are the need to incorporate lessons learned in design, to carefully consider implementation of new designs and automation, and the need to reduce human performance-based contributions to risk. In spite of shared concerns, there are several roadblocks to widespread sharing of data and lessons learned from operating experience and simulation, including the fact that very few publicly accessible data bases exist (Gertman & Blackman, 1994, and Kirwan, 1997). There is a need to draw together analysts and analytic methodologies to comprise a centralized source of data with sufficient detail to be meaningful while ensuring source anonymity. We propose that a generic source of performance data and a multi-domain data store may provide the first steps toward cooperative performance modeling and analysis across industries. C1 Lockheed Martin Idaho Technol Co, Idaho Falls, ID USA. RP Reece, WJ (reprint author), Lockheed Martin Idaho Technol Co, Idaho Falls, ID USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU HUMAN FACTORS AND ERGONOMICS SOC PI SANTA MONICA PA PO BOX 1369, SANTA MONICA, CA 90406-1369 USA SN 1071-1813 BN 0-945289-11-1 J9 HUM FAC ERG SOC P PY 1998 BP 697 EP 701 PG 5 WC Engineering, Aerospace; Computer Science, Cybernetics; Engineering, Multidisciplinary; Engineering, Industrial SC Engineering; Computer Science GA BM69U UT WOS:000079494900147 ER PT S AU Blackman, HS Byers, JC AF Blackman, HS Byers, JC GP HFES HFES HFES TI Unsolved problem: Acceptance of human reliability analysis SO PROCEEDINGS OF THE HUMAN FACTORS AND ERGONOMICS SOCIETY 42ND ANNUAL MEETING, VOLS 1 AND 2 SE HUMAN FACTORS AND ERGONOMICS SOCIETY ANNUAL MEETING PROCEEDINGS LA English DT Proceedings Paper CT 42nd Annual Meeting of the Human-Factors-and-Ergonomics-Society CY OCT 05-09, 1998 CL CHICAGO, IL SP Human Factors & Ergon Soc AB The practice and application of human reliability analysis (HRA) have long been controversial among human factors' professionals. The controversy has centered on quantification, lack of data, and the proper view of the human in the system. Benefits of structured HRA techniques, such as increased understanding of tasks, and of the conditions that produce errors, have often been ignored. With the increased emphasis on risk-based management and regulation we see this as a problem that must be solved to further our discipline's contribution to society. The problem can be attacked by: establishing what can make HRA legitimate in the eyes of HFES members, reviewing HRA methodologies for appropriateness and developing new methods with current concerns in mind, and developing good HRA data to support HRA judgments. The problem is not only tractable, but easily solved with cooperation, understanding, learning, and resources. C1 Lockheed Martin Idaho Technol Co, Idaho Natl Engn & Environm Lab, Idaho Falls, ID USA. RP Blackman, HS (reprint author), Lockheed Martin Idaho Technol Co, Idaho Natl Engn & Environm Lab, Idaho Falls, ID USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU HUMAN FACTORS AND ERGONOMICS SOC PI SANTA MONICA PA PO BOX 1369, SANTA MONICA, CA 90406-1369 USA SN 1071-1813 BN 0-945289-11-1 J9 HUM FAC ERG SOC P PY 1998 BP 702 EP 704 PG 3 WC Engineering, Aerospace; Computer Science, Cybernetics; Engineering, Multidisciplinary; Engineering, Industrial SC Engineering; Computer Science GA BM69U UT WOS:000079494900148 ER PT S AU Bittner, AC AF Bittner, AC GP HFES HFES HFES TI Applications of individual-differences: Assessment of environmental influences SO PROCEEDINGS OF THE HUMAN FACTORS AND ERGONOMICS SOCIETY 42ND ANNUAL MEETING, VOLS 1 AND 2 SE HUMAN FACTORS AND ERGONOMICS SOCIETY ANNUAL MEETING PROCEEDINGS LA English DT Proceedings Paper CT 42nd Annual Meeting of the Human-Factors-and-Ergonomics-Society CY OCT 05-09, 1998 CL CHICAGO, IL SP Human Factors & Ergon Soc AB Enhancing assessments of environmental-effects, particularly through the capturing and use of individual-differences information, has been of continuing interest over the last two decades. Applications of individual-differences information during the phases of environmental research are reviewed with illustrations from recent research studies (re: workplace exposures to Styrene, Perchloroethylene, and Hg-0). Utility of individual-differences information is illustrated during: (1) early phases of research when concern is on understanding past research, (2) middle phases when focus is on selecting research methodology, and (3) the final phases when attention is turned to understanding and generalization of findings. It is concluded that: Assessments of environmental influences can be made more powerful, cost-efficient and meaningful by taking advantage of individual-differences information throughout the environmental research process. C1 Battelle Seattle Res Ctr, Seattle, WA USA. RP Bittner, AC (reprint author), Battelle Seattle Res Ctr, Seattle, WA USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU HUMAN FACTORS AND ERGONOMICS SOC PI SANTA MONICA PA PO BOX 1369, SANTA MONICA, CA 90406-1369 USA SN 1071-1813 BN 0-945289-11-1 J9 HUM FAC ERG SOC P PY 1998 BP 779 EP 783 PG 5 WC Engineering, Aerospace; Computer Science, Cybernetics; Engineering, Multidisciplinary; Engineering, Industrial SC Engineering; Computer Science GA BM69U UT WOS:000079494900167 ER PT S AU Stubler, WF O'Hara, JM AF Stubler, WF O'Hara, JM GP HFES HFES HFES TI When soft controls get slippery: User interfaces and human error SO PROCEEDINGS OF THE HUMAN FACTORS AND ERGONOMICS SOCIETY 42ND ANNUAL MEETING, VOLS 1 AND 2 SE HUMAN FACTORS AND ERGONOMICS SOCIETY ANNUAL MEETING PROCEEDINGS LA English DT Proceedings Paper CT 42nd Annual Meeting of the Human-Factors-and-Ergonomics-Society CY OCT 05-09, 1998 CL CHICAGO, IL SP Human Factors & Ergon Soc AB Many types of products and systems that have traditionally featured physical control devices are now being designed with soft controls - input formats appearing on computer-based display devices and operated by a variety of input devices. A review of complex human-machine systems found that soft controls are particularly prone to some types of errors and may affect overall system performance and safety. This paper discusses the application of design approaches for reducing the likelihood of these errors and for enhancing usability, user satisfaction, and system performance and safety. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Stubler, WF (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 11 TC 0 Z9 0 U1 0 U2 1 PU HUMAN FACTORS AND ERGONOMICS SOC PI SANTA MONICA PA PO BOX 1369, SANTA MONICA, CA 90406-1369 USA SN 1071-1813 BN 0-945289-11-1 J9 HUM FAC ERG SOC P PY 1998 BP 1281 EP 1285 PG 5 WC Engineering, Aerospace; Computer Science, Cybernetics; Engineering, Multidisciplinary; Engineering, Industrial SC Engineering; Computer Science GA BM69U UT WOS:000079494900266 ER PT B AU Berger, EL AF Berger, EL BE Kodaira, J Onogi, T Sasaki, K TI Threshold resummation of soft gluons in hadronic reactions - An introduction SO PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON QCD CORRECTIONS AND NEW PHYSICS LA English DT Proceedings Paper CT International Symposium on QCD Corrections and New Physics CY OCT 27-29, 1997 CL HIROSHIMA, JAPAN AB I discuss the motivation for resummation of the effects of initial-state soft gluon radiation, to all orders in the strong coupling strength. for processes in which the near-threshold region in the partonic subenergy is important. I summarize the method of "perturbative resummation" and its application to the calculation of the total cross section for top quark production at hadron colliders. Comments are included on the differences between the treatment of subleading logarithmic terms in this method and in other approaches. C1 Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. RP Berger, EL (reprint author), Argonne Natl Lab, Div High Energy Phys, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3466-X PY 1998 BP 1 EP 15 PG 15 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BM22A UT WOS:000078048700001 ER PT B AU Parke, S AF Parke, S BE Kodaira, J Onogi, T Sasaki, K TI Top quark physics: Overview SO PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON QCD CORRECTIONS AND NEW PHYSICS LA English DT Proceedings Paper CT International Symposium on QCD Corrections and New Physics CY OCT 27-29, 1997 CL HIROSHIMA, JAPAN AB In this presentation I will primarily focus on top quark physics but I will include a discussion of the W-boson mass and the possibility of discovering a light Higgs boson via associated production at the Tevatron. C1 Fermi Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA. RP Parke, S (reprint author), Fermi Natl Accelerator Lab, Dept Theoret Phys, POB 500, Batavia, IL 60510 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3466-X PY 1998 BP 31 EP 45 PG 15 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BM22A UT WOS:000078048700003 ER PT B AU Kluth, S AF Kluth, S BE Kodaira, J Onogi, T Sasaki, K TI QCD results from LEP1 and 2 SO PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON QCD CORRECTIONS AND NEW PHYSICS LA English DT Proceedings Paper CT International Symposium on QCD Corrections and New Physics CY OCT 27-29, 1997 CL HIROSHIMA, JAPAN AB Recent results from QCD analyses at LEP1 and LEP2 are presented. High statistics LEP1 analyses make use of the very large data samples recorded at root s similar or equal to M-Z0 and provide detailed tests of perturbative QCD, the QCD based Monte Carlo models and also of the differences between quark and gluon jets. The LEP2 analyses are based on very small data sets at high energy and provide general tests of QCD. Combined data on measurements of the strong coupling alpha(s) from LEP1 and LEP2 give good evidence that in QCD a running coupling is preferred over a constant coupling. C1 CERN, PPE, CH-1211 Geneva 23, Switzerland. RP Kluth, S (reprint author), LBNL, Div Phys, 1 Cyclotron Rd, Berkeley, CA 94702 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3466-X PY 1998 BP 149 EP 169 PG 21 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BM22A UT WOS:000078048700012 ER PT B AU Gomberg, M Evard, R Stacey, C AF Gomberg, M Evard, R Stacey, C GP USENIX TI A comparison of large-scale software installation methods on NT and UNIX SO PROCEEDINGS OF THE LARGE INSTALLATION SYSTEM ADMINISTRATION OF WINDOWS NT CONFERENCE LA English DT Proceedings Paper CT Large Installation System Administration of Windows NT Conference CY AUG 05-08, 1998 CL SEATTLE, WA SP USENIX Assoc, SAGE, Syst Adm Guild AB Our computing environment consists of hundreds of UNIX and NT-based computers. We have a coherent UNIX software installation model that scales comfortably to hundreds of machines. We have spent a great deal of time in the last year learning to understand the software installation and support mechanisms for a similarly large NT infrastructure. In this paper, we examine the underlying requirements for large-scale software installation support, and compare and contrast the NT and UNIX environments, identifying strong points, weak points, and issues. C1 Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. RP Gomberg, M (reprint author), Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU USENIX ASSOC PI BERKELEY PA SUITE 215, 2560 NINTH ST, BERKELEY, CA 94710 USA BN 1-880446-96-0 PY 1998 BP 37 EP 47 PG 11 WC Computer Science, Software Engineering SC Computer Science GA BL60K UT WOS:000075983200005 ER PT B AU Jackson, JD AF Jackson, JD BE Cheu, E Embry, T Rutherfoord, J Wigmans, R TI Rainbows, plain and fancy SO PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON CALORIMETRY IN HIGH ENERGY PHYSICS LA English DT Proceedings Paper CT 7th International Conference on Calorimetry in High Energy Physics CY NOV 09-14, 1997 CL TUCSON, AZ C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Jackson, JD (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3400-7 PY 1998 BP 1 EP 11 PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA BM22H UT WOS:000078176500001 ER PT B AU David, G Goto, Y Kistenev, E Stoll, S White, S Woody, C Bazilevsky, A Belikov, S Chernichenkov, S Denisov, A Kochetkov, V Melnikov, Y Onuchin, V Semenov, V Shelikhov, V Soldatov, A Usachev, A AF David, G Goto, Y Kistenev, E Stoll, S White, S Woody, C Bazilevsky, A Belikov, S Chernichenkov, S Denisov, A Kochetkov, V Melnikov, Y Onuchin, V Semenov, V Shelikhov, V Soldatov, A Usachev, A BE Cheu, E Embry, T Rutherfoord, J Wigmans, R TI The PHENIX PbSc calorimeter and its performance SO PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON CALORIMETRY IN HIGH ENERGY PHYSICS LA English DT Proceedings Paper CT 7th International Conference on Calorimetry in High Energy Physics CY NOV 09-14, 1997 CL TUCSON, AZ AB We have recently completed the production of the 15552 channel PbSc Electromagnetic calorimeter for the PHENIX experiment at RHIC. Our design features a single 4 tower module which is repeated throughout and which was produced with a number of QC steps designed to achieve consistent, large light yield in all channels. We present results on uniformity of the calorimeter, accuracy of a cosmic muon based precalibration scheme and test beam performance. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP David, G (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3400-7 PY 1998 BP 286 EP 294 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA BM22H UT WOS:000078176500032 ER PT B AU Schoessow, P Ambats, I Ayres, DS Dawson, JW Haberichter, WN Hill, N Talaga, RL Thron, JL Gornushkin, Y Sadovski, A Miller, JL Schwienhorst, R Gallagher, H Arroyo, C Mann, WA Barrett, WL AF Schoessow, P Ambats, I Ayres, DS Dawson, JW Haberichter, WN Hill, N Talaga, RL Thron, JL Gornushkin, Y Sadovski, A Miller, JL Schwienhorst, R Gallagher, H Arroyo, C Mann, WA Barrett, WL BE Cheu, E Embry, T Rutherfoord, J Wigmans, R TI Results from an iron-proportional tube calorimeter prototype SO PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON CALORIMETRY IN HIGH ENERGY PHYSICS LA English DT Proceedings Paper CT 7th International Conference on Calorimetry in High Energy Physics CY NOV 09-14, 1997 CL TUCSON, AZ AB We have studied the energy resolution of a prototype gas tracking calorimeter in a test beam at Fermilab as part of the detector development program for the MINOS long baseline neutrino oscillation experiment. The calorimeter consisted of 25 layers of 1.5 inch thick steel plates interleaved with planes of aluminum proportional tubes. The tube cells are square, with 0.9 cm edges and open tops. Cathode strips were used for read out transverse to the wire cells. The tubes operated with a nonflammable gas mixture of 88% CO2, 9.5% isobutane and 2.5% argon which gave an operating range of > 500 V (limited by the electronics). We read out the wire signals on the tubes and in some configurations the cathode strips as well. We studied positrons, pions and muons over a momentum range of 2.5 - 30 GeV/c and achieved energy resolutions of about 40%/root E for EM and 71%/root E for hadronic showers. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Schoessow, P (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3400-7 PY 1998 BP 319 EP 326 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA BM22H UT WOS:000078176500036 ER PT B AU Nguyen, H AF Nguyen, H BE Cheu, E Embry, T Rutherfoord, J Wigmans, R TI The performance of a high speed pipelined photomultiplier readout system in the Fermilab KTeV experiment SO PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON CALORIMETRY IN HIGH ENERGY PHYSICS LA English DT Proceedings Paper CT 7th International Conference on Calorimetry in High Energy Physics CY NOV 09-14, 1997 CL TUCSON, AZ AB The KTeV fixed target experiment at Fermilab is using an innovative scheme for reading out its 3100 channel CsI electromagnetic calorimeter. This pipelined readout system digitizes photomultiplier tube (PMT) signals over a 16-bit dynamic range with 8-bits of resolution at 53 MHz. The crucial element of the system is a custom Bi-CMOS integrated circuit which, in conjunction with an g-bit Flash ADC, integrates and digitizes the PMT signal charge over each 18.9 nsec clock cycle (53 MHz) in a deadtimeless fashion. The digitizer circuit is local to the PMT base, and has an in-situ charge integration noise figure of 3 fC/sample. In this article, the readout system will be described and its performance including noise, cross-talk, linearity, stability and reliability will be discussed. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Nguyen, H (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3400-7 PY 1998 BP 413 EP 419 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA BM22H UT WOS:000078176500048 ER PT B AU Rescia, S AF Rescia, S CA Atlas Larg Collaboration BE Cheu, E Embry, T Rutherfoord, J Wigmans, R TI Overview of the front end electronics for the ATLAS LAR calorimeter SO PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON CALORIMETRY IN HIGH ENERGY PHYSICS LA English DT Proceedings Paper CT 7th International Conference on Calorimetry in High Energy Physics CY NOV 09-14, 1997 CL TUCSON, AZ AB Proposed experiments for the Large Hadron Collider (LHC) set new demands on calorimeter readout electronics. The very high energy and large luminosity of the collider call for a large number of high speed, large dynamic range readout channels which have to be carefully synchronized. The ATLAS liquid argon collaboration, after more than 5 years of R&D developments has now finalized the architecture of its front-end and read-out electronics, which have been written down in its Technical Design Report (TDR) [1]. An overview is presented below. More details, schematics and measurement results are shown in Ref. [1]. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Rescia, S (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3400-7 PY 1998 BP 451 EP 459 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA BM22H UT WOS:000078176500052 ER PT B AU Groom, DE AF Groom, DE BE Cheu, E Embry, T Rutherfoord, J Wigmans, R TI Energy flow in a hadronic cascade: Application to hadron calorimetry SO PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON CALORIMETRY IN HIGH ENERGY PHYSICS LA English DT Proceedings Paper CT 7th International Conference on Calorimetry in High Energy Physics CY NOV 09-14, 1997 CL TUCSON, AZ AB We extend the hadronic cascade description developed in an earlier paper to the behavior of an ideal fine-sampling hadron calorimeter. Calorimeter response is largely determined by the transfer of energy E-e from the hadronic to electromagnetic sectors via pi(0) production. Fluctuations in this quantity produce the "constant term" in hadron calorimeter resolution. The increase of its mean, F(pi)0 = [E-e]/E, with increasing incident energy E results in the energy dependence of the "e/pi" ratio in a noncompensating calorimeter. The mean hadronic energy fraction, F-h = 1 - F(pi)0, has been shown to scale very nearly as a power law in E: F-h = (E/E-0)(m-1), where E-0 approximate to I GeV for pions, and m approximate to 0.83. It follows that "pi/e"=1 - (1 - h/e)(E/E-0)(m-1), where electromagnetic and hadronic energy deposits are detected with efficiencies e and h, respectively. Fluctuations in these quantities, along with "photoelectron statistics" are incorporated to give an overall understanding of resolution. The conceptual framework is also extended to the difference between pi and p response. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Groom, DE (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3400-7 PY 1998 BP 507 EP 521 PG 15 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA BM22H UT WOS:000078176500058 ER PT B AU Paxson, V AF Paxson, V GP USENIX TI Bro: A system for detecting network intruders in real-time SO PROCEEDINGS OF THE SEVENTH USENIX SECURITY SYMPOSIUM LA English DT Proceedings Paper CT 7th USENIX Security Symposium CY JAN 26-29, 1998 CL SAN ANTONIO, TX SP USENIX Assoc, Comp Emergency Response Team AB We describe Bro, a stand-alone system for detecting network intruders in real-time by passively monitoring a network link over which the intruder's traffic transits. We give an overview of the system's design, which emphasizes high-speed (FDDI-rate) monitoring, real-time notification, clear separation between mechanism and policy, and extensibility. To achieve these ends, Bro is divided into an "event engine" that reduces a kernel-filtered network traffic stream into a series of higher-level events, and a "policy script interpreter" that interprets event handlers written in a specialized language used to express a site's security policy. Event handlers can update state information, synthesize new events, record information to disk, and generate real-time notifications via syslog. We also discuss a number of attacks that attempt to subvert passive monitoring systems and defenses against these, and give particulars of how Bro analyzes the four applications integrated into it so far: Finger, FTP, Portmapper and Telnet. The system is publicly available in source code form. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Network Res Grp, Berkeley, CA 94720 USA. RP Paxson, V (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Network Res Grp, Berkeley, CA 94720 USA. NR 0 TC 7 Z9 8 U1 0 U2 1 PU USENIX ASSOC PI BERKELEY PA SUITE 215, 2560 NINTH ST, BERKELEY, CA 94710 USA BN 1-880446-92-8 PY 1998 BP 31 EP 51 PG 21 WC Computer Science, Theory & Methods SC Computer Science GA BK54E UT WOS:000072521000003 ER EF