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MOPLS122 |
Design of the ILC Prototype FONT4 Digital Intra-train Beam-based Feedback System
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849 |
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- P. Burrows
Queen Mary University of London, London
- G.B. Christian, H. Dabiri Khah, A.F. Hartin, G.R. White
JAI, Oxford
- C.C. Clarke, C. Perry
OXFORDphysics, Oxford, Oxon
- A. Kalinin
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- D.J. McCormick, S. Molloy, M.C. Ross
SLAC, Menlo Park, California
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We report on the design and initial testing of the 4th generation Feedback on Nanosecond Timescales (FONT) prototype intra-train beam-based feedback system for beam control and luminosity optimisation at the International Linear Collider (ILC). FONT4 comprises a fast-analogue front-end BPM signal processor, with an FPGA-based digital feedback processor and a fast-risetime kicker-driver amplifier. The system is being designed with a total latency budget (including signal propagation delays) of about 140ns. FONT4 will be deployed at the Accelerator Test Facility (ATF) at KEK, where it will be tested with the electron bunchtrain extracted from the ATF damping ring. The bunches will have a spacing of c. 150ns, chosen to match the ILC design. We report the results of initial beam tests of the system components. We aim to demonstrate feedback, with delay-loop operation, on this ILC-like bunchtrain.
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MOPLS123 |
Performance of the FONT3 Fast Analogue Intra-train Beam-based Feedback System at ATF
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852 |
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- P. Burrows
Queen Mary University of London, London
- G.B. Christian, A.F. Hartin, H.D. Khah, G.R. White
JAI, Oxford
- C.C. Clarke, C. Perry
OXFORDphysics, Oxford, Oxon
- A. Kalinin
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- D.J. McCormick, S. Molloy, M.C. Ross
SLAC, Menlo Park, California
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We report on the design and testing of the 3rd generation Feedback On Nanosecond Timescales (FONT) prototype intra-train beam-based feedback system for beam control and luminosity optimisation at the International Linear Collider (ILC). The all-analogue FONT3 electronics was designed to have an ultra-short latency of c. 10ns. We describe the design of the BPM signal processor, feedback circuit and kicker-driver amplifier. We report on deployment of FONT3 at the Accelerator Test Facility (ATF) at KEK, where it was tested with the 56ns-long electron bunchtrain extracted from the ATF damping ring. Feedback, with delay-loop operation, on the beam was demonstrated with a latency close to design. We comment on the applicability of this technology to ILC, as well as future warm-RF based linear colliders, such as CLIC.
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TUYPA02 |
High Precision SC Cavity Alignment Diagnostics with HOM Measurements
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920 |
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- J.C. Frisch, L. Hendrickson, J. May, D.J. McCormick, S. Molloy, M.C. Ross, T.J. Smith
SLAC, Menlo Park, California
- N. Baboi, O. Hensler, L.M. Petrosyan
DESY, Hamburg
- N.E. Eddy, S. Nagaitsev
Fermilab, Batavia, Illinois
- O. Napoly, R. Paparella, C. Simon
CEA, Gif-sur-Yvette
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Experiments at the TTF at DESY have demonstrated that the Higher Order Modes induced in Superconducting Cavities can be used to provide a variety of beam and cavity diagnostics. The centers of the cavities can be determined from the beam orbit which produces minimum power in the dipole HOM modes. The phase and amplitude of the dipole modes can be used as a high resolution beam position monitor, and the phase of the monopole modes to measure the beam phase relative to the accelerator RF. Beam orbit feedback which minimizes the dipole HOM power in a set of structures has been demonstrated. For most SC accelerators, the existing HOM couplers provide the necessary signals, and the downmix and digitizing electronics are straightforward, similar to those for a conventional BPM.
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Transparencies
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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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