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Watson, N. K.

Paper Title Page
WEPP162 Beam Impact Studies on ILC Collimators 2865
 
  • G. Ellwood
    STFC/RAL, Chilton, Didcot, Oxon
  • J.-L. Fernandez-Hernando, J. K. Jones
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • M. Slater, N. K. Watson
    Birmingham University, Birmingham
  
  Spoilers in the ILC Beam Delivery System are required to survive without failure a minimum of 1-2 direct impacts of 250 GeV-500 GeV bunch of electrons or positrons, in addition to maintaining low geometric and resistive wall wake fields. Simulations were completed to determine the energy deposition of an ILC bunch to a set of different spoiler designs. These shower simulations were used as inputs to thermal and mechanical studies using ANSYS. This paper presents the results of testing carried out at the Accelerator Test Facility at KEK used to validate the simulations. Results from the first phase of testing, in which electron bunches of varying charge were incident on TI-6Al-4V foils, are presented and compared with simulations.  
WEPP163 Measurements of Collimator Wakefields at End Station A 2868
 
  • J.-L. Fernandez-Hernando
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • S. Molloy
    SLAC, Menlo Park, California
  • J. D.A. Smith
    Cockcroft Institute, Warrington, Cheshire
  • N. K. Watson
    Birmingham University, Birmingham
  
  The angular kicks imparted to an electron beam with energy of 28.5 GeV when it passes through a collimator jaw with a certain offset, generating a wakefield, were measured in End Station A (ESA) in SLAC for fifteen different collimator configurations of geometry and material. Some configurations were chosen in order to compare with previous measurements while others served to study the effect of geometry and taper angles (geometrical contribution to the wakefield) and the effect of the material resistivity (resistive contribution) to the kick. This paper summarises the final experimental results. The reconstructed kick factor is compared to analytical calculations and simulations.  
WEPP168 Mechanical Design of Collimators for the ILC 2883
 
  • B. D. Fell, D. Angal-Kalinin, S. C. Appleton, J.-L. Fernandez-Hernando, F. Jackson, O. B. Malyshev
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • N. Bliss
    STFC/DL, Daresbury, Warrington, Cheshire
  • G. Ellwood, R. J.S. Greenhalgh
    STFC/RAL, Chilton, Didcot, Oxon
  • J. D.A. Smith
    Cockcroft Institute, Warrington, Cheshire
  • N. K. Watson
    Birmingham University, Birmingham
  
  Much attention has been paid to the optimisation of the geometry and material of collimators in the ILC to mitigate the effects of both short-range transverse wakefields and errant beam impacts. We discuss the competing demands imposed by realistic engineering constraints and present a preliminary engineering design for adjustable jaw spoilers for the ILC.