PAC07 - List of Authors (Chung, C. C.)

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Chung, C. C.

Paper	Title	Page
FRPMS049	Resolution of a High Performance Cavity Beam Position Monitor System	4090
	S. Walston S. T. Boogert Royal Holloway, University of London, Surrey C. C. Chung, P. Fitsos, J. Gronberg LLNL, Livermore, California J. C. Frisch, S. Hinton, J. May, D. J. McCormick, S. Smith, T. J. Smith, G. R. White SLAC, Menlo Park, California H. Hayano, Y. Honda, N. Terunuma, J. Urakawa KEK, Ibaraki Yu. G. Kolomensky, T. Orimoto UCB, Berkeley, California P. Loscutoff LBNL, Berkeley, California A. Lyapin, S. Malton, D. J. Miller UCL, London R. Meller Cornell University, Department of Physics, Ithaca, New York M. C. Ross Fermilab, Batavia, Illinois M. Slater, M. Thomson, D. R. Ward University of Cambridge, Cambridge V. Vogel DESY, Hamburg
	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. A metrology system for the three BPMs was recently installed. This system employed optical encoders to measure each BPM's position and orientation relative to a zero-coefficient of thermal expansion carbon fiber frame and has demonstrated that the three BPMs behave as a rigid-body to less than 5 nm. To date, we have demonstrated a BPM resolution of less than 20 nm over a dynamic range of ± 20 microns.