Paper |
Title |
Page |
MOPLS066 |
Direct Measurement of Geometric and Resistive Wakefields in Tapered Collimators for the International Linear Collider
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697 |
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- N.K. Watson, D. Adey, M.C. Stockton
Birmingham University, Birmingham
- D.A.-K. Angal-Kalinin, C.D. Beard, J.L. Fernandez-Hernando, F. Jackson
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- R. Arnold, R.A. Erickson, C. Hast, T.W. Markiewicz, S. Molloy, M.C. Ross, S. Seletskiy, A. Seryi, Z. Szalata, P. Tenenbaum, M. Woodley, M. Woods
SLAC, Menlo Park, California
- R.J. Barlow, A. Bungau, R.M. Jones, G.Yu. Kourevlev, A. Mercer
UMAN, Manchester
- D.A. Burton, J.D.A. Smith, A. Sopczak, R. Tucker
Lancaster University, Lancaster
- C. Densham, G. Ellwood, R.J.S. Greenhalgh, J. O'Dell
CCLRC/RAL, Chilton, Didcot, Oxon
- Y.K. Kolomensky
UCB, Berkeley, California
- M. Kärkkäinen, W.F.O. Müller, T. Weiland
TEMF, Darmstadt
- N. Shales
Microwave Research Group, Lancaster University, Lancaster
- M. Slater
University of Cambridge, Cambridge
- I. Zagorodnov
DESY, Hamburg
- F. Zimmermann
CERN, Geneva
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Precise collimation of the beam halo is required in the ILC to prevent beam losses near the interaction region that could cause unacceptable backgrounds for the physics detector. The necessarily small apertures of the collimators lead to transverse wakefields that may result in beam deflections and increased emittance. A set of collimator wakefield measurements has previously been performed in the ASSET region of the SLAC LINAC. We report on the next phase of this programme, which is carried out at the recently commissioned End Station A test facility at SLAC. Measurements of resistive and geometric wakefields using tapered collimators are compared with model predictions from MAFIA and GdfidL and with analytic calculations.
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MOPLS067 |
Test Beam Studies at SLAC's End Station A, for the International Linear Collider
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700 |
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- M. Woods, C. Adolphsen, R. Arnold, G.B. Bowden, G.R. Bower, R.A. Erickson, H. Fieguth, J.C. Frisch, C. Hast, R.H. Iverson, Z. Li, T.W. Markiewicz, D.J. McCormick, S. Molloy, J. Nelson, M.T.F. Pivi, M.C. Ross, S. Seletskiy, A. Seryi, S. Smith, Z. Szalata, P. Tenenbaum
SLAC, Menlo Park, California
- D. Adey, M.C. Stockton, N.K. Watson
Birmingham University, Birmingham
- M. Albrecht, M.H. Hildreth
Notre Dame University, Notre Dame, Iowa
- W.W.M. Allison, V. Blackmore, P. Burrows, G.B. Christian, C.C. Clarke, G. Doucas, A.F. Hartin, B. Ottewell, C. Perry, C. Swinson, G.R. White
OXFORDphysics, Oxford, Oxon
- D.A.-K. Angal-Kalinin, C.D. Beard, J.L. Fernandez-Hernando, F. Jackson, A. Kalinin
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- R.J. Barlow, A. Bungau, G.Yu. Kourevlev, A. Mercer
UMAN, Manchester
- S.T. Boogert
Royal Holloway, University of London, Surrey
- D.A. Burton, J.D.A. Smith, R. Tucker
Lancaster University, Lancaster
- W.E. Chickering, C.T. Hlaing, O.N. Khainovski, Y.K. Kolomensky, T. Orimoto
UCB, Berkeley, California
- C. Densham, R.J.S. Greenhalgh
CCLRC/DL, Daresbury, Warrington, Cheshire
- V. Duginov, S.A. Kostromin, N.A. Morozov
JINR, Dubna, Moscow Region
- G. Ellwood, P.G. Huggard, J. O'Dell
CCLRC/RAL, Chilton, Didcot, Oxon
- F. Gournaris, A. Lyapin, B. Maiheu, S. Malton, D.J. Miller, M.W. Wing
UCL, London
- M.B. Johnston
University of Oxford, Clarendon Laboratory, Oxford
- M.F. Kimmitt
University of Essex, Physics Centre, Colchester
- H.J. Schriber, M. Viti
DESY Zeuthen, Zeuthen
- N. Shales, A. Sopczak
Microwave Research Group, Lancaster University, Lancaster
- N. Sinev, E.T. Torrence
University of Oregon, Eugene, Oregon
- M. Slater, M.T. Thomson, D.R. Ward
University of Cambridge, Cambridge
- Y. Sugimoto
KEK, Ibaraki
- S. Walston
LLNL, Livermore, California
- T. Weiland
TEMF, Darmstadt
- M. Wendt
Fermilab, Batavia, Illinois
- I. Zagorodnov
DESY, Hamburg
- F. Zimmermann
CERN, Geneva
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The SLAC Linac can deliver to End Station A a high-energy test beam with similar beam parameters as for the International Linear Collider for bunch charge, bunch length and bunch energy spread. ESA beam tests run parasitically with PEP-II with single damped bunches at 10Hz, beam energy of 28.5 GeV and bunch charge of (1.5-2.0)·1010 electrons. A 5-day commissioning run was performed in January 2006, followed by a 2-week run in April. We describe the beamline configuration and beam setup for these runs, and give an overview of the tests being carried out. These tests include studies of collimator wakefields, prototype energy spectrometers, prototype beam position monitors for the ILC Linac, and characterization of beam-induced electro-magnetic interference along the ESA beamline.
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THPCH089 |
The Electromagnetic Background Environment for the Interaction-point Beam Feedback System at the International Linear Collider
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2997 |
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- G.B. Christian, P. Burrows, G.B. Christian, C.C. Clarke, A.F. Hartin, C. Swinson, G.R. White
OXFORDphysics, Oxford, Oxon
- R. Arnold, C. Hast, S. Smith, M. Woods
SLAC, Menlo Park, California
- A. Kalinin
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
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The Interaction Point (IP) feedback system is essential for maintaining the luminosity at the International Linear Collider (ILC). It is necessary to demonstrate the performance of the feedback beam position monitor (BPM) in an electron-positron pair background similar to that expected in the ILC interaction region (IR). We have simulated the ILC beam-beam interactions and used a GEANT model of the IR to evaluate the pair and photon flux incident on the BPM, for both the 2 mrad and 20 mrad crossing angle geometries. We present results as a function of the proposed machine parameter schemes, as well as for various system layouts within the IR. We plan to study the degradation of BPM resolution, and the long term survivability, in beam tests at End Station A at SLAC. To simulate the background environment of the ILC a 'spray beam' will be produced, which will scatter from a mechanical mock-up of the forward region of the IR, and irradiate the BPM with realistic flux of secondary pairs. We present the proposed experimental layout and planned beam tests.
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