Paper |
Title |
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MOPP056 |
Beam Coupling Impedance in the ILC Damping Rings
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670 |
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- M. Korostelev, O. B. Malyshev, A. Wolski
Cockcroft Institute, Warrington, Cheshire
- A. F. Grant, J. Lucas
STFC/DL, Daresbury, Warrington, Cheshire
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The ILC damping rings have stringent specifications for beam quality and stability. To avoid instabilities, the various components in the vacuum chamber will need to be carefully designed to minimize the longitudinal and transverse wake fields. We present the results of impedance calculations for various components that are expected to make a significant contribution to the overall machine impedance.
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MOPP057 |
ILC DR Vacuum Design and E-cloud
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673 |
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- O. B. Malyshev
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- W. Bruns
WBFB, Berlin
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An electron cloud parameters and vacuum design are tightly bounded to each other. Input parameters for the e-cloud depend on shape of vacuum chamber and surface property (material, roughthness, coatings, etc.), electron multipacting in the vacuum chamber causes the electron stimulated gas desorption and may require modification of vacuum system to deal with it. This paper describes the e-cloud modelling performed in a way to optimise ILC DR vacuum design in positron ring and to have clear understanding what modification in vacuum chamber are required. Three parameters of e-cloud were varied in turn: photo-electron emission, secondary electron yield and gas pressure. It was found all three parameter should not exceed certain value to keep the e-cloud density to an acceptable level. The energy and intensity of electron bombardment of the vacuum chamber walls and electron stimulated gas desorption were also calculated. It was found that electron stimulated gas desorption is comparable or larger than the photon stimulated desorption and should be considered in vacuum design.
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WEPP168 |
Mechanical Design of Collimators for the ILC
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2883 |
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- B. D. Fell, D. Angal-Kalinin, S. C. Appleton, J.-L. Fernandez-Hernando, F. Jackson, O. B. Malyshev
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- N. Bliss
STFC/DL, Daresbury, Warrington, Cheshire
- G. Ellwood, R. J.S. Greenhalgh
STFC/RAL, Chilton, Didcot, Oxon
- J. D.A. Smith
Cockcroft Institute, Warrington, Cheshire
- N. K. Watson
Birmingham University, Birmingham
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Much attention has been paid to the optimisation of the geometry and material of collimators in the ILC to mitigate the effects of both short-range transverse wakefields and errant beam impacts. We discuss the competing demands imposed by realistic engineering constraints and present a preliminary engineering design for adjustable jaw spoilers for the ILC.
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MOPP008 |
Design of the Photon Collimators for the ILC Positron Helical Undulator
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565 |
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- A. Bungau
UMAN, Manchester
- I. R. Bailey, J. B. Dainton, K. M. Hock, L. J. Jenner, L. I. Malysheva
Liverpool University, Science Faculty, Liverpool
- E. Baynham, T. W. Bradshaw, F. S. Carr, J. Rochford
STFC/RAL/ASTeC, Chilton, Didcot, Oxon
- A. J. Brummitt, A. J. Lintern
STFC/RAL, Chilton, Didcot, Oxon
- J. A. Clarke, O. B. Malyshev, N. C. Ryder, D. J. Scott
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- N. A. Collomb
STFC/DL, Daresbury, Warrington, Cheshire
- A. F. Hartin
OXFORDphysics, Oxford, Oxon
- S. Hesselbach, G. A. Moortgat-Pick
Durham University, Durham
- L. Zang
Cockcroft Institute, Warrington, Cheshire
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A number of photon collimators are placed inside the helical undulator to protect the cold surfaces of the vacuum vessel from being hit by the photons and thus achieving the baseline pressure requirement. Computer simulations were run in order to determine the energy deposition and instantaneous temperature rise in these collimators and various material candidates were studied. This paper presents the status of the simulation.
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MOPP024 |
Depolarization and Beam-beam Effects at the Linear Collider
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598 |
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- G. A. Moortgat-Pick, S. Hesselbach
Durham University, Durham
- I. R. Bailey, G. A. Moortgat-Pick, B. J.A. Shepherd
Cockcroft Institute, Warrington, Cheshire
- D. P. Barber
DESY, Hamburg
- E. Baynham, T. W. Bradshaw, F. S. Carr, J. Rochford
STFC/RAL/ASTeC, Chilton, Didcot, Oxon
- A. J. Brummitt, A. J. Lintern
STFC/RAL, Chilton, Didcot, Oxon
- A. Bungau
UMAN, Manchester
- J. A. Clarke, O. B. Malyshev, N. C. Ryder, D. J. Scott
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- J. B. Dainton, K. M. Hock, L. J. Jenner, L. I. Malysheva, L. Zang
Liverpool University, Science Faculty, Liverpool
- A. F. Hartin
OXFORDphysics, Oxford, Oxon
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The clean environment at the interaction point of a lepton linear collider allows high-precision measurements for physics analyses. In order to exploit this potential, precise knowledge about the polarization state of the beams is also required. In this paper we concentrate on depolarization effects caused by the intense beam-beam interaction, which is expected to be the dominant source of depolarization. Higher-order effects, as well as critical analyses of the theoretical assumptions used in the past and theoretical improvements in the derivation of suitable equations, are given. Updates on existing simulation programs are reported. Numerical results for the design of the International Linear Collider (ILC) are discussed.
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MOPP070 |
Construction of a Full Scale Superconducting Undulator Module for the International Linear Collider Positron Source
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709 |
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- J. A. Clarke, O. B. Malyshev, D. J. Scott, B. J.A. Shepherd
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- I. R. Bailey, J. B. Dainton, K. M. Hock, L. J. Jenner, L. I. Malysheva, L. Zang
Liverpool University, Science Faculty, Liverpool
- E. Baynham, T. W. Bradshaw, A. J. Brummitt, F. S. Carr, A. J. Lintern, J. Rochford
STFC/RAL, Chilton, Didcot, Oxon
- A. Bungau
UMAN, Manchester
- N. A. Collomb
STFC/DL, Daresbury, Warrington, Cheshire
- A. F. Hartin
OXFORDphysics, Oxford, Oxon
- S. Hesselbach, G. A. Moortgat-Pick
Durham University, Durham
- Y. Ivanyushenkov
ANL, Argonne, Illinois
- N. C. Ryder
University of Bristol, Bristol
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The positron source for the ILC is dependent upon a >200m long undulator to generate a high flux of multi-MeV photons. The undulator system is broken down into a series of 4m cryomodules, which each contain two superconducting helical undulators. Following a dedicated R&D phase and the construction and measurement of a number of short prototypes a full scale cryomodule has now been completed for the first time. This paper reports on the design, manufacture, and test results of this cryomodule.
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WEOBG03 |
The Design of the Positron Source for the International Linear Collider
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1915 |
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- J. A. Clarke, O. B. Malyshev, D. J. Scott
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- I. R. Bailey, J. B. Dainton, K. M. Hock, L. J. Jenner, L. I. Malysheva, L. Zang
Liverpool University, Science Faculty, Liverpool
- E. Baynham, T. W. Bradshaw, A. J. Brummitt, F. S. Carr, A. J. Lintern, J. Rochford
STFC/RAL, Chilton, Didcot, Oxon
- V. Bharadwaj, J. Sheppard
SLAC, Menlo Park, California
- A. Bungau
UMAN, Manchester
- N. A. Collomb
STFC/DL, Daresbury, Warrington, Cheshire
- R. Dollan
Humboldt Universität zu Berlin, Berlin
- W. Gai, Y. Ivanyushenkov, W. Liu
ANL, Argonne, Illinois
- J. Gronberg, W. T. Piggott
LLNL, Livermore, California
- A. F. Hartin
OXFORDphysics, Oxford, Oxon
- S. Hesselbach, G. A. Moortgat-Pick
Durham University, Durham
- K. Laihem, S. Riemann, A. Schaelicke, A. Ushakov
DESY Zeuthen, Zeuthen
- T. Lohse
Humboldt University Berlin, Institut für Physik, Berlin
- A. A. Mikhailichenko
Cornell University, Department of Physics, Ithaca, New York
- N. C. Ryder
University of Bristol, Bristol
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The high luminosity requirements and the option of a polarized positron beam present a great challenge for the positron source of a future linear collider. This paper provides a comprehensive overview of the latest proposed design for the baseline positron source of the International Linear Collider. We report on recent progress and results concerning the main components of the source: including the undulator, collimators, capture optics, and target.
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Slides
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