| Paper |
Title |
Page |
| FRPMS049 |
Resolution of a High Performance Cavity Beam Position Monitor System
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4090 |
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- 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
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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. 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.
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| FRPMN090 |
A Prototype Energy Spectrometer for the ILC at End Station A in SLAC
|
4285 |
| |
- A. Lyapin
- C. Adolphsen, R. Arnold, C. Hast, D. J. McCormick, Z. Szalata, M. Woods
SLAC, Menlo Park, California
- S. T. Boogert, G. E. Boorman
Royal Holloway, University of London, Surrey
- M. V. Chistiakova, Yu. G. Kolomensky, E. Petigura, M. Sadre-Bazzaz
UCB, Berkeley, California
- V. N. Duginov, S. A. Kostromin, N. A. Morozov
JINR, Dubna, Moscow Region
- F. Gournaris, B. Maiheu, D. J. Miller, M. Wing
UCL, London
- M. Hildreth
Notre Dame University, Notre Dame, Iowa
- H. J. Schreiber, M. Viti
DESY Zeuthen, Zeuthen
- M. Slater, M. Thomson, D. R. Ward
University of Cambridge, Cambridge
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The main physics programme of the international linear collider requires a measurement of the beam energy with a relative precision on the order of 10-4 or better. To achieve this goal a magnetic spectrometer using high resolution beam position monitors (BPM) has been proposed. A prototype spectrometer chicane using 4 dipole magnets is currently under development at the End Station A in SLAC, intending to demonstrate the required stability of this method and investigate possible systematic effects and operational issues. This contribution reports on the successful commissioning of the beam position monitor system and the resolution and stability achieved. Also, the initial results from a run with a full spectrometer chicane are presented.
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