Author: Asami, T.
Paper Title Page
THPAB245 A Simulation Study of Beam Pipe Eddy Current Effects on Beam Optics 4288
 
  • T. Asami, T. Koseki
    The University of Tokyo, Graduate School of Science, Tokyo, Japan
  • S. Igarashi, T. Koseki, Y. Kurimoto, Y. Sato
    KEK, Ibaraki, Japan
  
  In syn­chro­trons, fast changes of mag­netic field in­duce eddy cur­rents at the wall of beam pipes. The eddy cur­rents cause a phase delay be­tween ex­ci­ta­tion cur­rents of the mag­nets and the mag­netic field. The un­de­sired mag­netic field af­fected by eddy cur­rents might be a se­ri­ous ob­sta­cle in con­trol­ling beam op­tics pre­cisely. In fact, in the op­er­a­tion of a high-in­ten­sity pro­ton syn­chro­tron J-PARC MR, the largest beam loss is ob­served at the be­gin­ning of ac­cel­er­a­tion when the mag­netic field starts to vary in time. There­fore, it is im­por­tant to es­ti­mate and un­der­stand the ef­fects of eddy cur­rents on beam op­tics. In this study, we have cal­cu­lated the ef­fect of eddy cur­rents on mag­netic field for some mag­nets in J-PARC MR, using elec­tro­mag­netic sim­u­la­tion soft­ware. In this paper, we would like to re­port the de­tails and re­sults of the sim­u­la­tion.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB245  
About • paper received ※ 19 May 2021       paper accepted ※ 26 July 2021       issue date ※ 17 August 2021  
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