Paper |
Title |
Page |
MOPLS080 |
A Laser-wire System at the ATF Extraction Line
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738 |
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- S.T. Boogert, G.A. Blair, G.E. Boorman, A. Bosco, L. Deacon, C. Driouichi
Royal Holloway, University of London, Surrey
- A. Aryshev, H. Hayano, V. Karataev, K. Kubo, N. Terunuma, J. Urakawa
KEK, Ibaraki
- A. Brachmann, J.C. Frisch, M.C. Ross
SLAC, Menlo Park, California
- N. Delerue
JAI, Oxford
- S. Dixit, F.B. Foster, G.F. Gannaway, D.F. Howell, Q.M. Qureshi, A. Reichold, R. Senanayake
OXFORDphysics, Oxford, Oxon
- L.J. Jenner
Cockcroft Institute, Warrington, Cheshire
- T. Kamps
BESSY GmbH, Berlin
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A new laser-wire system has been installed at the ATF extraction line at KEK, Tsukuba. The system aims at a micron-scale laser spot size and employs a mode-locked laser system. The purpose-built interaction chamber, light delivery optics, and lens systems are described, and the first results are presented.
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TUPCH105 |
Performance of a Nanometer Resolution BPM System
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1256 |
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- S. Walston, C.C. Chung, P. Fitsos, J.G. Gronberg
LLNL, Livermore, California
- S.T. Boogert
Royal Holloway, University of London, Surrey
- J.C. Frisch, J. May, D.J. McCormick, M.C. Ross, S. Smith, T.J. Smith
SLAC, Menlo Park, California
- H. Hayano, Y. Honda, N. Terunuma, J. Urakawa
KEK, Ibaraki
- Y.K. Kolomensky, T. Orimoto
UCB, Berkeley, California
- A. Lyapin, S. Malton, D.J. Miller
UCL, London
- R. Meller
Cornell University, Department of Physics, Ithaca, New York
- M. Slater, M.T. Thomson, D.R. Ward
University of Cambridge, Cambridge
- V.V. Vogel
DESY, Hamburg
- G.R. White
OXFORDphysics, Oxford, Oxon
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International Linear Collider (ILC) interaction region beam sizes and component position stability requirements will be as small as a few nanometers. It is important to the ILC design effort to demonstrate that these tolerances can be achieved ideally using beam-based stability measurements. It has been estimated that RF cavity beam position monitors (BPMs) could provide position measurement resolutions of less than one nanometer and could form the basis of the desired beam-based stability measurement. We have developed a high resolution RF cavity BPM system. A triplet of these BPMs has been installed in the extraction line of the KEK Accelerator Test Facility (ATF) for testing with its ultra-low emittance beam. The three BPMs are rigidly mounted inside an alignment frame on variable-length struts which allow movement in position and angle. We have developed novel methods for extracting the position and tilt information from the BPM signals including a calibration algorithm which is immune to beam jitter. To date, we have been able to demonstrate a resolution of approximately 20 nm over a dynamic range of ± 20 microns. We report on the progress of these ongoing tests.
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WEPLS060 |
CLIC Polarized Positron Source Based on Laser Compton Scattering
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2520 |
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- F. Zimmermann, H.-H. Braun, M. Korostelev, L. Rinolfi, D. Schulte
CERN, Geneva
- S. Araki, Y. Higashi, Y. Honda, Y. Kurihara, M. Kuriki, T. Okugi, T. Omori, T. Taniguchi, N. Terunuma, J. Urakawa
KEK, Ibaraki
- X. Artru, R. Chehab, M. Chevallier
IN2P3 IPNL, Villeurbanne
- E.V. Bulyak, P. Gladkikh
NSC/KIPT, Kharkov
- M.K. Fukuda, K. Hirano, M. Takano
NIRS, Chiba-shi
- J. Gao
IHEP Beijing, Beijing
- S. Guiducci, P. Raimondi
INFN/LNF, Frascati (Roma)
- T. Hirose, K. Sakaue, M. Washio
RISE, Tokyo
- K. Moenig
DESY Zeuthen, Zeuthen
- H.D. Sato
HU/AdSM, Higashi-Hiroshima
- V. Soskov
LPI, Moscow
- V.M. Strakhovenko
BINP SB RAS, Novosibirsk
- T. Takahashi
Hiroshima University, Higashi-Hiroshima
- A. Tsunemi
SHI, Tokyo
- V. Variola, Z.F. Zomer
LAL, Orsay
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We describe the possible layout and parameters of a polarized positron source for CLIC, where the positrons are produced from polarized gamma rays created by Compton scattering of a 1.3-GeV electron beam off a YAG laser. This scheme is very energy effective using high finesse laser cavities in conjunction with an electron storage ring. We point out the differences with respect to a similar system proposed for the ILC.
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