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Title |
Page |
| MOPAN109 |
Turnaround Feed-Forward Correction at the ILC
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419 |
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- A. Kalinin
- P. Burrows
JAI, Oxford
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Funding: The Commission of European Communities under 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899, and by the UK Particle Physics & Astronomy Research Council.
The RTML turnaround feed-forward correction scheme, as proposed in the ILC Baseline Configuration Document, is considered. Instabilities in the challenging Damping Ring extraction kicker system may give rise to betatron bunch-by-bunch jitter and position drift across the bunch train. A system is outlined in which the bunch trajectory is measured with an upstream pair of BPMs and corrected with a pair of downstream fast kickers. The beam turnaround time allows signal processing and calculation of the correction. A feed-forward algorithm is formulated and expressions are derived for the main system parameters and procedures: dynamic range, maximal kicker voltage, gain compression error, BPM resolution, system zero offset stability, BPM-to-kicker matrix measurement, feed-forward gain adjustment. This analysis will enable further consideration of system tolerances, and provides a basis for an engineering design.
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| MOPAN108 |
The FONT4 ILC Intra-train Beam-based Digital Feedback System Prototype
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416 |
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- P. Burrows
- G. B. Christian, C. I. Clarke, B. Constance, A. F. Hartin, H. D. Khah, C. Perry, C. Swinson, G. R. White
JAI, Oxford
- A. Kalinin
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- S. Molloy
SLAC, Menlo Park, California
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We present the design of the FONT4 intra-train beam-based digital position feedback system prototype. The system incorporates a fast analogue beam position monitor front-end signal processor, a digital feedback board, and a fast kicker-driver amplifier. The system latency goal is less than 150ns. We report preliminary results of beam tests at the Accelerator Test Facility (ATF) at KEK using electron bunches separated by c. 150ns.
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| WEOBAB01 |
Electromagnetic Background Tests for the ILC Interaction Point Feedback System
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1970 |
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- P. Burrows
- R. Arnold, S. Molloy, S. Smith, G. R. White, M. Woods
SLAC, Menlo Park, California
- G. B. Christian, C. I. Clarke, B. Constance, A. F. Hartin, H. D. Khah, C. Perry, C. Swinson, G. R. White
JAI, Oxford
- A. Kalinin
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
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We present results obtained with the T-488 experiment at SLAC Endstation A (ESA). A material model of the ILC extraction-line design was assembled and installed in ESA. The module includes materials representing the mask, beamline calorimeter, and first extraction quadrupole, encompassing a stripline interaction-point feedback system beam position monitor (BPM). The SLAC high-energy electron beam was used to irradiate the module in order to mimic the electromagnetic (EM) backgrounds expected in the ILC interaction region. The impact upon the performance of the feedback BPM was measured, and compared with detailed simulations of its expected response.
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Slides
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| WEPMN080 |
Development of Circuits and System Models for the Synchronization of the ILC Crab Cavities
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2215 |
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- A. C. Dexter
- C. D. Beard, P. Goudket, A. Kalinin, L. Ma, P. A. McIntosh
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- G. Burt, R. G. Carter, R. O. Jenkins, M. I. Tahir
Cockcroft Institute, Lancaster University, Lancaster
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Funding: The Commission of the European Communities under the 6th Framework Programme (Structuring the European Research Area) The UK particle physics and astromony research council.
The ILC reference design report (RDR) recommends a 14 mrad crossing angle for the positron and electron beams at the IP. A matched pair of crab cavity systems are required in the beam delivery system to align both bunches at the IP. The use of a multi-cell, 3.9GHz dipole mode superconducting cavity, derived from the Fermilab CKM cavity. Dipole-mode cavities phased for crab rotation are shifted by 90 degrees with respect to similar cavities phased for deflection. Uncorrelated phase errors of 0.086 degrees (equivalent to 61fs) for the two cavity systems, gives an average of 180nm for the relative deflection of the bunch centers. For a horizontal bunch size of 655nm, a deflection of 180nm reduces the ILC luminosity by 2%. The crab cavity systems are to be placed ~28m apart and their synchronization to within 61fs is on the limit of what is presently achievable. This paper describes the design and testing of circuits and control algorithms under development at the Cockcroft Institute in the UK for proof of principle experiments planned on the ERLP at Daresbury and on the ILCTA test beamline at FNAL. Simulation results for measurement and control systems are also given.
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| THPMN079 |
Simulation of ILC Feedback BPM Signals in an Intense Background Environment
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2889 |
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- A. F. Hartin
- R. Arnold, S. Molloy, S. Smith, M. Woods
SLAC, Menlo Park, California
- P. Burrows, G. B. Christian, C. I. Clarke, B. Constance, H. D. Khah, C. Perry, C. Swinson, G. R. White
JAI, Oxford
- A. Kalinin
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
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Funding: This work is supported in part by the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899.
Experiment T-488 at SLAC, End Station A recorded distorted BPM voltage signals and an accurate simulation of these signals was performed. Geant simulations provided the energy and momentum spectrum of the incident spray and secondary emissions, and a method via image charges was used to convert particle momenta and number density into BPM stripline currents. Good agreement was achieved between simulated and measured signals. Further simulation of experiment T-488 with incident beam on axis and impinging on a thin radiator predicted minimal impact due to secondary emission. By extension to worst case conditions expected at the ILC, simulations showed that background hits on BPM striplines would have a negligible impact on the accuracy of beam position measurements and hence the operation of the FONT feedback system
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| WEOCAB01 |
Design of the Beam Delivery System for the International Linear Collider
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1985 |
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- A. Seryi
- I. V. Agapov, G. A. Blair, S. T. Boogert, J. Carter
Royal Holloway, University of London, Surrey
- M. Alabau, P. Bambade, J. Brossard, O. Dadoun
LAL, Orsay
- J. A. Amann, R. Arnold, F. Asiri, K. L.F. Bane, P. Bellomo, E. Doyle, A. F. Fasso, L. Keller, J. Kim, K. Ko, Z. Li, T. W. Markiewicz, T. V.M. Maruyama, K. C. Moffeit, S. Molloy, Y. Nosochkov, N. Phinney, T. O. Raubenheimer, S. Seletskiy, S. Smith, C. M. Spencer, P. Tenenbaum, D. R. Walz, G. R. White, M. Woodley, M. Woods, L. Xiao
SLAC, Menlo Park, California
- M. Anerella, A. K. Jain, A. Marone, B. Parker
BNL, Upton, Long Island, New York
- D. A.-K. Angal-Kalinin, C. D. Beard, J.-L. Fernandez-Hernando, P. Goudket, F. Jackson, J. K. Jones, A. Kalinin, P. A. McIntosh
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- R. Appleby
UMAN, Manchester
- J. L. Baldy, D. Schulte
CERN, Geneva
- L. Bellantoni, A. I. Drozhdin, V. S. Kashikhin, V. Kuchler, T. Lackowski, N. V. Mokhov, N. Nakao, T. Peterson, M. C. Ross, S. I. Striganov, J. C. Tompkins, M. Wendt, X. Yang
Fermilab, Batavia, Illinois
- K. Buesser
DESY, Hamburg
- P. Burrows, G. B. Christian, C. I. Clarke, A. F. Hartin
OXFORDphysics, Oxford, Oxon
- G. Burt, A. C. Dexter
Cockcroft Institute, Warrington, Cheshire
- J. Carwardine, C. W. Saunders
ANL, Argonne, Illinois
- B. Constance, H. Dabiri Khah, C. Perry, C. Swinson
JAI, Oxford
- O. Delferriere, O. Napoly, J. Payet, D. Uriot
CEA, Gif-sur-Yvette
- C. J. Densham, R. J.S. Greenhalgh
STFC/RAL, Chilton, Didcot, Oxon
- A. Enomoto, S. Kuroda, T. Okugi, T. Sanami, Y. Suetsugu, T. Tauchi
KEK, Ibaraki
- A. Ferrari
UU/ISV, Uppsala
- J. Gronberg
LLNL, Livermore, California
- Y. Iwashita
Kyoto ICR, Uji, Kyoto
- W. Lohmann
DESY Zeuthen, Zeuthen
- L. Ma
STFC/DL, Daresbury, Warrington, Cheshire
- T. M. Mattison
UBC, Vancouver, B. C.
- T. S. Sanuki
University of Tokyo, Tokyo
- V. I. Telnov
BINP SB RAS, Novosibirsk
- E. T. Torrence
University of Oregon, Eugene, Oregon
- D. Warner
Colorado University at Boulder, Boulder, Colorado
- N. K. Watson
Birmingham University, Birmingham
- H. Y. Yamamoto
Tohoku University, Sendai
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The beam delivery system for the linear collider focuses beams to nanometer sizes at the interaction point, collimates the beam halo to provide acceptable background in the detector and has a provision for state-of-the art beam instrumentation in order to reach the physics goals. The beam delivery system of the International Linear Collider has undergone several configuration changes recently. This paper describes the design details and status of the baseline configuration considered for the reference design.
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Slides
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