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Piggott, W.T.

Paper Title Page
THPEC033 Eddy Current Studies From the Undulator-based Positron Source Target Wheel Prototype 4125
 
  • I.R. Bailey, J.A. Clarke, D.J. Scott
    Cockcroft Institute, Warrington, Cheshire
  • I.R. Bailey
    Lancaster University, Lancaster
  • C.G. Brown, J. Gronberg, L.B. Hagler, W.T. Piggott
    LLNL, Livermore, California
  • L.J. Jenner
    Imperial College of Science and Technology, Department of Physics, London
  • L. Zang
    The University of Liverpool, Liverpool
  
 

The ef­fi­cien­cy of fu­ture positron sources for the next gen­er­a­tion of high-en­er­gy par­ti­cle col­lid­ers (e.g. ILC, CLIC, LHeC) can be im­proved if the positron-pro­duc­tion tar­get is im­mersed in the mag­net­ic field of ad­ja­cent cap­ture op­tics. If the tar­get is also ro­tat­ing due to heat de­po­si­tion con­sid­er­a­tions then eddy cur­rents may be in­duced and lead to ad­di­tion­al heat­ing and stress­es. In this paper we pre­sent data from a ro­tat­ing tar­get wheel pro­to­type for the base­line ILC positron source. The wheel has been op­er­at­ed at rev­o­lu­tion rates up to 1800rpm in fields of the order of 1 Tesla. Com­par­isons are made be­tween torque data ob­tained from a trans­duc­er on the tar­get drive shaft and the re­sults of fi­nite-el­e­ment sim­u­la­tions. Ro­tor­dy­nam­ics is­sues are pre­sent­ed and fu­ture ex­per­i­ments on other as­pects of the positron source tar­get sta­tion are con­sid­ered.

  
THPEC037 Design of a Pulsed Flux Concentrator for the ILC Positron Source 4137
 
  • J. Gronberg, A. Abbott, C.G. Brown, J.B. Javedani, W.T. Piggott
    LLNL, Livermore, California
  • J.A. Clarke
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  
 

The positron source at a fu­ture TeV scale elec­tron lin­ear col­lid­er will need to gen­er­ate positrons at a rate two or­ders of mag­ni­tude larg­er than have been pre­vi­ous­ly achieved. We re­port on a de­sign of a 3.5 Tesla pulsed flux con­cen­tra­tor mag­net which uses liq­uid ni­tro­gen cool­ing of the flux con­cen­tra­tor plates to re­duce the elec­tri­cal re­sis­tance lead­ing to re­duced en­er­gy de­po­si­tion and the abil­i­ty to gen­er­ate the re­quired 1 ms pulse du­ra­tion. This mag­net can dou­ble the col­lec­tion ef­fi­cien­cy of positrons emit­ted from the tar­get.