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Eddy current studies from the undulator-based positron source target wheel prototype

Research output: Contribution to conference - Without ISBN/ISSN Conference paper

  • I. R. Bailey
  • J. A. Clarke
  • D. J. Scott
  • C. G. Brown
  • J. Gronberg
  • L. B. Hagler
  • W. T. Piggott
  • L. J. Jenner
  • L. Zang
Publication date19/05/2010
Number of pages3
<mark>Original language</mark>English
EventThe 1st International Particle Accelerator Conference - Kyoto, Japan
Duration: 23/05/201028/05/2010


ConferenceThe 1st International Particle Accelerator Conference
CityKyoto, Japan


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.