Author: Okabe, K.
Paper Title Page
MOPAB174 Foil Hits Reduction by Minimizing Injection Beam Size at the Foil in J-PARC RCS 590
 
  • P.K. Saha, H. Harada, K. Okabe, F. Tamura, M. Yoshimoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • H. Hotchi
    KEK, Tokai, Ibaraki, Japan
  
  Funding: Pranab Kumar Saha
The un­con­trolled beam loss caused by the foil scat­ter­ing of the cir­cu­lat­ing beam dur­ing multi-turn charge-ex­change in­jec­tion is one of the main sources for high resid­ual ra­di­a­tion at the in­jec­tion area of J-PARC 3-GeV rapid cy­cling syn­chro­tron. We stud­ied to re­duce foil hits of the cir­cu­lat­ing beam by min­i­miz­ing the ver­ti­cal in­jec­tion beam size at the foil and using a smaller ver­ti­cal foil size. The ver­ti­cal foil size was re­duced ac­cord­ing to the in­jec­tion beam size by main­tain­ing the strip­ping ef­fi­ciency. As a re­sult, the num­ber of cir­cu­lat­ing beam pass­ing through foil was sig­nif­i­cantly re­duced due to smaller foil size. The sim­u­la­tion and mea­sure­ment re­sults of the foil hits re­duc­tion are pre­sented in this paper. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB174  
About • paper received ※ 20 May 2021       paper accepted ※ 31 May 2021       issue date ※ 28 August 2021  
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