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Swinson, C.

Paper Title Page
TUPC033 IP BPM Position Error at CLIC due to Secondary Emission from Beam-beam Backgrounds 1122
 
  • A. F. Hartin, R. Apsimon, P. Burrows, C. I. Clarke, C. Perry, C. Swinson
    OXFORDphysics, Oxford, Oxon
  • G. B. Christian
    ATOMKI, Debrecen
  • B. Constance, H. Dabiri Khah
    JAI, Oxford
  • A. Kalinin
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
 
  Beam-beam background impacts on the IP BPM are studied for the CLIC machine. The large number of coherent pairs ( 1.8×108 charges per BPM strip per bunch crossing) for the CLIC-G default parameter set, potentially leads to a large secondary emission in the BPM strips. Detailed GuineaPig++ and Geant studies reveal, however, that the coherent pairs travel down the extraction line without significant secondary showering. Geant studies of the CLIC incoherent pairs show a flux of secondary emission two orders of magnitude less than that expected for the ILC 1 TeV high luminosity scheme. Since previous studies showed that FONT IP BPM signal distortion for the ILC was of no concern, then it can also be neglected at CLIC.  
THPC114 Design and Performance of a Prototype Digital Feedback System for the International Linear Collider Interaction Point 3245
 
  • P. Burrows, B. Constance, H. Dabiri Khah, J. Resta-López
    JAI, Oxford
  • R. Apsimon, P. Burrows, C. I. Clarke, A. F. Hartin, C. Perry, C. Swinson
    OXFORDphysics, Oxford, Oxon
  • G. B. Christian
    ATOMKI, Debrecen
  • A. Kalinin
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
 
  We present the design and preliminary results of a prototype beam-based digital feedback system for the Interaction Point of the International Linear Collider. A custom analogue front-end processor, FPGA-based digital signal processing board, and kicker drive amplifier have been designed, built, and tested on the extraction line of the KEK Accelerator Test Facility (ATF). The system was measured to have a base latency of approximately 140 ns, increasing to approximately 148 ns with the inclusion of real-time charge normalisation.