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Ma, L.

Paper Title Page
MOZBKI02 The BEPC II: Status and Early Commissioning 53
  • J. Q. Wang, L. Ma, C. Zhang
    IHEP Beijing, Beijing
  BEPCII is the upgrade project of Beijing Electron Positron Collider (BEPC). The installation of its storage ring components except the superconducting (SC) insertion magnets was completed in early November, 2006. While the improvement of the cryogenic system for SC magnets is in progress, the commissioning of the synchrotron radiation (SR) mode for the so called back-up scheme with conventional magnets adopted in the interaction region (IR), started on Nov. 13, 2006. The first electron beam was stored on Nov. 18 and later beam was provided to SR users for about 1 month starting from Dec. 25, 2006. The commissioning of the collision mode including the electron and positrion rings started in Feb. 2007. The first beam collision was realized on Mar. 25. Then optimization of the beam parameters was done. On May 14, a 100mA to 100mA beam collision was achieved with 20 bunches for each beam. The luminosity estimated from the measured beam-beam parameters has reached that of BEPC. From May 25 the machine turns to the second run of the SR mode. This paper provides an overview of the construction and introduce the commissioning results of the backup scheme of BEPCII.  
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MOPAN053 Development of Transverse Feedback System and Instabilities Suppress at HLS 269
  • J. H. Wang, Y. B. Chen, L. J. Huang, W. Li, L. Liu, B. Sun, L. Wang, Y. L. Yang, K. Zheng, Z. R. Zhou
    USTC/NSRL, Hefei, Anhui
  • J. Cao, L. Ma, J. Yue
    IHEP Beijing, Beijing
  • D. K. Liu, K. R. Ye
    SINAP, Shanghai
  In order to cure and damp coupled bunch (CB) instabilities, a transverse bunch-by-bunch feedback system is under commission at Hefei Light Source (HLS). In this paper, we introduce the HLS Bunch-by-Bunch measurement system and transverse feedback system. The experiment result in HLS ring is also presented in this paper.  
WEOCAB01 Design of the Beam Delivery System for the International Linear Collider 1985
  • A. Seryi, 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
  • 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
  • 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
  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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WEPMN080 Development of Circuits and System Models for the Synchronization of the ILC Crab Cavities 2215
  • A. C. Dexter, G. Burt, R. G. Carter, R. O. Jenkins, M. I. Tahir
    Cockcroft Institute, Lancaster University, Lancaster
  • C. D. Beard, P. Goudket, A. Kalinin, L. Ma, P. A. McIntosh
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  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.