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THXFI — Beam Dynamics and Electromagnetic Fields29-Jun-06 09:00 - 09:30 THXFI — Beam Dynamics and Electromagnetic Fields State of the Art in EM Field Computation This presentation will provide an up-to-date survey of the methods and tools for the computation of electromagnetic fields in accelerator systems and components. C.-K. Ng (SLAC) Chair: T. Weiland (TEMF, Darmstadt) 381 THXFI01
THOAFI01 THOAFI02 THOAFI03 29-Jun-06 09:30 - 10:30 THOAFI — Beam Dynamics and Electromagnetic . . . THOAFI — Beam Dynamics and Electromagnetic Fields The Development of Computational Tools for Halo Analysis and Study of Halo Growth in the Spallation Neutron Source Linear Accelerator D.A. Bartkoski, A.V. Aleksandrov, S.M. Cousineau, S. Henderson, J.A. Holmes (ORNL) Computational tools have been developed to quantify the halo in a beam by analyzing beam profiles and identifying the halo particles using the Gaussian area ratio and kurto- sis methods. Simulations of various injection quadrupole magnet configurations using three types of initial simulated distributions, along with an analysis of their phase space and rms properties, provides insight into the development of halo in the Spallation Neurton Source linear accelerator. Finally, comparisons with machine beam profile data, taken at the same conditions as that of the simulated data, show how accurately the simulations model the beam and its halo development and provide a better understanding of the best machine configuration with which to minimize beam halo and losses. Ion Instability Observed in PLS Revolver In-vacuum Undulator Revolver In-Vacuum X-ray Undulator which H.-S. Kang, J. Choi, M. Kim, T.-Y. Koo, T.-Y. Lee, P.C.D. Park (PAL) was designed and fabricated at Spring-8 is under commissioning at PLS. This planar undulator whose permanent magnet array structure is a revolving type with 90-degree step provides 4 different undulator wavelengths of 10, 15, 20, and 24 mm. The minimum gap of the undulator is as small as 5 mm. It was observed that the trailing part of a long bunch train was scraped due to ion instability when the undulator gap was closed below 6 mm. At that time the vacuum pressure in the undulator, which is estimated to be about one order of magnitude lower than that of the undulator gap, increased from 1.4 x 10 -10 (gap 20 mm) to 7.9 x 10 -10 Torr (gap 6 mm) at the stored beam current of 100 mA. This high vacuum pressure causes fast beam-ion instability: trailing part of a long bunch train oscillates vertically. It was also confirmed that adjusting the orbit along the undulator has improved the situation to some extent. The ion instability measured with a pico-second streak camera and a one-turn BPM as well as the result of orbit adjustment and chromaticity control will be described in this paper. Global and Local Coupling Compensation Experiments in RHIC using AC Dipoles Compensation of transverse coupling during R. Calaga (BNL) F. Franchi (GSI) R. Tomas (<strong>CERN</strong>) the RHIC energy ramp has been proven to be non-trivial and tedious. The lack of accurate knowledge of the coupling sources has initiated several efforts to develop fast techique using turn-by-turn BPM data to identify and compensate these sources. This paper aims to summarize the beam experiments performed to measure the coupling matrix and resonance driving terms with the aid of RHIC ac dipoles. 382 Chair: T. Weiland (TEMF, Darmstadt)
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Contents MOXPA — Linear Colliders
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Contents MOPCH056 Development of Hi
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Contents MOPCH140 Compensation of L
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Contents MOPLS020 Rad-hard Luminosi
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Contents MOPLS102 Beam Dynamic Stud
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TUOCFI — Accelerator Technology C
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Contents TUPCH074 Fast and Precise
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Contents TUPCH159 High Power Wavegu
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Contents TUPLS039 Proposal of a Nor
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Contents TUPLS127 Permanent Deforma
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Contents WEPCH020 Extending the Lin
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Contents WEPCH108 FFAG Computation
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Contents WEPCH192 Compact Electron
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Contents WEPLS078 Design Study of t
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THOPA — Synchrotron Light Sources
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Contents THPCH042 Numerical Estimat
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Contents THPCH124 Visual Programmin
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Contents THPLS008 Commissioning of
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Contents THPLS099 Fast Kicker Syste
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MOXPA — Linear Colliders, Lepton
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MOYBPA — Circular Colliders 26-Ju
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MOZBPA — Synchrotron Light Source
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MOPCH — Poster Session 26-Jun-06
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WEYPA — Linear Colliders, Lepton
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WEOAPA — Linear Colliders, Lepton
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WEXFI — Beam Dynamics and Electro
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WEOFI — Beam Dynamics and Electro
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WEPCH — Poster Session 28-Jun-06
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Amro, A. THPLS043 An, D.H. TUPCH070
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Bates, D.A. WEPCH150 Battaglia, D.
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Bondarenko, A.V. MOPCH057, MOPCH073
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Campmany, J. THPLS053, THPLS134, TH
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Chung, C.C. TUPCH105 Chung, C.W. TU
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Della Mea, G. TUPLS016 Della Penna,
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Frisch, J.C. MOPLS081, TUYPA02, TUP
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WEPCH095 Hershcovitch, A. TUPLS103
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Ischebeck, R. WEOAPA01 Ishi, Y. WEP
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Klein, R. THPLS013, THPLS014, THPLS
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Kurdi, G. WEPLS059 Kurennoy, S.S. T
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Lin, F. MOPCH100 Lin, F.-Y. THPCH18
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Mariette, C. THPLS102 Marinkovic, G
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Neuenschwander, R.T. WEPCH005, THPC
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Plate, D.W. THPLS114 Plesko, M. WEI
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Reiche, S. MOPCH028, WEPCH150 Reich
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Saewert, G.W. TUPLS069 Safranek, J.
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Simos, N. MOPCH138, TUPLS133, WEPCH
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Sun, Y. MOPLS089 Surrow, B. MOPLS05
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TUPCH083 Welton, R.F. MOPCH129, TUP
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Yurkov, M.V. TUPCH081, THPLS133 Yus
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