Paper |
Title |
Page |
MOPLS060 |
Design of an Interaction Region with Head-on Collisions for the ILC
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682 |
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- J. Payet, O. Napoly, C. Rippon, D. Uriot
CEA, Gif-sur-Yvette
- M. Alabau Pons, P. Bambade, J. Brossard, O. Dadoun, C. Rimbault
LAL, Orsay
- D.A.-K. Angal-Kalinin, F. Jackson
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- R. Appleby
UMAN, Manchester
- L. Keller, Y. Nosochkov, A. Seryi
SLAC, Menlo Park, California
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An interaction region with head-on collisions is considered an alternative to the baseline configuration of the International Linear Collider, including two interaction regions with finite crossing-angles (2 and 20 mrad). Although more challenging from the point of view of the beam extraction, the head-on scheme is favoured by the experiments because it allows a more convenient detector configuration, particularly in the forward region. The optics of the head-on extraction is revisited by separating the e+ and e- beams horizontally, first by electrostatic separators operated at their LEP nominal field and then using a defocusing quadrupole of the final focus beam line. In this way the septum magnet is protected from the beamstrahlung power. Newly optimized final focus and extraction optics are presented, including a first look at post-collision diagnostics. The influence of parasitic collisions is shown to lead to a region of stable collision parameters. Beam and beamstrahlung photon losses are calculated along the extraction elements. Issues concerning the design of the large bore superconducting final focus magnets, common to both incoming and outgoing beams, are considered.
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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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MOPLS077 |
The 2mrad Crossing Angle Interaction Region and Extraction Line
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730 |
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- R. Appleby
UMAN, Manchester
- D.A.-K. Angal-Kalinin
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- P. Bambade, O. Dadoun
LAL, Orsay
- J. Carter
Royal Holloway, University of London, Surrey
- L. Keller, K. C. Moffeit, Y. Nosochkov, A. Seryi, C.M. Spencer
SLAC, Menlo Park, California
- O. Napoly
CEA, Gif-sur-Yvette
- B. Parker
BNL, Upton, Long Island, New York
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A complete optics design for the 2mrad crossing angle interaction region and extraction line was presented at Snowmass 2005. Since this time, the design task force has been working on developing and improving the performance of the extraction line. The work has focused on optimising the final doublet parameters and on reducing the power losses resulting from the disrupted beam transport. In this paper, the most recent status of the 2mrad layout and the corresponding performance are presented.
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TUPCH048 |
A Study of Emittance Measurement at the ILC
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1115 |
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- G.A. Blair, I.V. Agapov, J. Carter, L. Deacon
Royal Holloway, University of London, Surrey
- D.A.-K. Angal-Kalinin
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- L.J. Jenner
Cockcroft Institute, Warrington, Cheshire
- M.C. Ross, A. Seryi, M. Woodley
SLAC, Menlo Park, California
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The measurement of the ILC emittance in the ILC beam delivery system and the linac is simulated. Estimates of statistical and machine-related errors are discussed and implications for related diagnostics R&D are inferred.
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