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Chung, C.C.

Paper Title Page
TUPCH105 Performance of a Nanometer Resolution BPM System 1256
 
  • 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
  
  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.