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Ellwood, G.

Paper Title Page
THPMN068 Beam Impact Studies on ILC Collimators 2859
 
  • G. Ellwood, R. J.S. Greenhalgh
    STFC/RAL, Chilton, Didcot, Oxon
  
  Funding: CCLRC The Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899.

Spoilers in the ILC Beam Delivery System are required to survive without failure a minimum of 1-2 direct impacts from each energetic electron or positron bunch of charged particles, in addition to maintaining low geometric and resistive wall wake fields. The transient shock wave resulting from rapid localised beam heating and its implications for spoiler design are studied using ANSYS. Shockwave propagation is modelled in 2 dimensions showing the effect of dilatational shockwaves striking free surfaces, producing reflected dilatational and distortional waves. The implication of these relflected waves on the damage of the collimators is also discussed.

 
THPMN072 Material Damage Test for ILC Collimators 2868
 
  • J.-L. Fernandez-Hernando
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • G. A. Blair, S. T. Boogert
    Royal Holloway, University of London, Surrey
  • G. Ellwood, R. J.S. Greenhalgh
    STFC/RAL, Chilton, Didcot, Oxon
  • L. Keller
    SLAC, Menlo Park, California
  • N. K. Watson
    Birmingham University, Birmingham
  
  Simulations were completed to determine the energy deposition of an ILC bunch using FLUKA , Geant4 and EGS4 to a set of different spoiler designs. These shower simulations were used as inputs to thermal and mechanical studies using ANSYS. This paper presents different proposals to carry out a material damage test beam that would benchmark the energy deposition simulations and the ANSYS studies and give the researchers valuable data which will help achieve a definitive ILC spoiler design.