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Tahir, M. I.

Paper Title Page
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.