| Paper |
Title |
Page |
| 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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| WEPLS048 |
Development of a Positron Production Target for the ILC Positron Source
|
2484 |
| |
- I.R. Bailey, I.R. Bailey, J.B. Dainton, D.J. Scott
Cockcroft Institute, Warrington, Cheshire
- V. Bharadwaj, J. Sheppard
SLAC, Menlo Park, California
- P. Cooke, P. Sutcliffe
Liverpool University, Science Faculty, Liverpool
- J.G. Gronberg, D.J. Mayhall, W.T. Piggott, W. Stein
LLNL, Livermore, California
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The future International Linear Collider (ILC) will require of order 1014 positrons per second to fulfil its luminosity requirements. The current baseline design produces this unprecedented flux of positrons using an undulator-based source. In this concept, a collimated beam of 10MeV photons produced from the action of an undulator on the main electron beam of the ILC is incident on a conversion target. Positrons produced in the resulting electromagnetic shower can then be captured, accelerated and injected into a damping ring. The international community is pursuing several alternative technologies to develop a target capable of long-term operation in the intense photon beam. In the design being developed jointly by the Cockcroft Institute, LLNL and SLAC, a thin (0.4 radiation length) water-cooled Titanium alloy target wheel of diameter 4m is rotated at approximately 1000rpm to spread the incident power of each pulse over a wide area. We present the latest target design, report on the status of the target prototypes and computer models, and review the interplay between the target technology, capture optics, photon collimator and remote-handling systems.
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