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Hendrickson, L.

Paper Title Page
MOPLT107 Nanosecond-timescale Intra-bunch-train Feedback for the Linear Collider: Results of the FONT2 Run 785
 
  • P. Burrows, T. Hartin, S.M. Hussain, S. Molloy, G.R. White
    Queen Mary University of London, London
  • C. Adolphsen, J.C. Frisch, L. Hendrickson, R.K. Jobe, T. Markiewicz, D.J. McCormick, J. Nelson, M.C. Ross, S. Smith, T.J. Smith
    SLAC, Menlo Park, California
  • R. Barlow, M. Dufau, A. Kalinin
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • G. Myatt, C. Perry
    OXFORDphysics, Oxford, Oxon
  
  We report on experimental results from the December 2003/January 2004 data run of the Feedback On Nanosecond Timescales (FONT) experiment at the Next Linear Collider Test Accelerator at SLAC. We built a second-generation prototype intra-train beam-based feedback system incorporating beam position monitors, fast analogue signal processors, a feedback circuit, fast-risetime amplifiers and stripline kickers. We applied a novel real-time charge-normalisation scheme to account for beam current variations along the train. We used the system to correct the position of the 170 nanosecond-long bunchtrain at NLCTA, in both 'feed forward' and 'feedback' modes. We achieved a latency of 53 nanoseconds, representing a significant improvement on FONT1 (2002), and providing a demonstration of intra-train feedback for the Linear Collider.  
THPLT156 Simulations of IP Feedback and Stabilization in the NLC 2822
 
  • L. Hendrickson, J.C. Frisch, T.M. Himel, T.O. Raubenheimer, A. Seryi, M. Woodley
    SLAC, Menlo Park, California
  • G.R. White
    Queen Mary University of London, London
  
  Keeping nanometer-sized beams in collision is an essential component in achieving design luminosity in a linear collider. The NLC stabilization strategy is conservative by including enough redundancy so that if some piece doesn't work to specification or the incoming beam motion is worse than expected, the beams will still be kept in collision. We show simulation results with both realistic and pessimistic assumptions about the response of the ground motion, inertial stabilization, interbunch and intertrain feedback systems. By providing backup systems, and by assuming that some systems may perform more poorly than expected, we can achieve a high level of confidence in our ability to successfully stabilize the beams.  
THPLT157 Beam-based Feedback for the NLC Linac 2825
 
  • L. Hendrickson, N. Phinney, A. Seryi, P. Tenenbaum, M. Woodley
    SLAC, Menlo Park, California
  
  The NLC linac train-by-train feedback system is designed to stabilize the beam trajectory, but is also a valuable element in the strategy for emittance preservation. New simulations employ improved strategies [*], allowing beam steering to be performed significantly less often than without the feedback system. Additional simulations indicate that the linac feedback can contribute towards successful operation at noisier sites.

* Beam-based Feedback Simulations for the NLC Linac, L. Hendrickson et al., LINAC, Monterey, California (2000)