Author: Araoka, O.
Paper Title Page
THOBB02 High Gradient Magnetic Alloy Cavities for J-PARC Upgrade 2885
 
  • C. Ohmori, O. Araoka, E. Ezura, K. Hara, K. Hasegawa, A. Koda, Y. Makida, Y. Miyake, R. Muto, K. Nishiyama, T. Ogitsu, H. Ohhata, K. Shimomura, A. Takagi, K. Takata, K.H. Tanaka, M. Toda, M. Yoshii
    KEK, Tokai, Ibaraki, Japan
  • T. Minamikawa
    University of Fukui, Fukui, Japan
  • M. Nomura, A. Schnase, T. Shimada, F. Tamura, M. Yamamoto
    JAEA/J-PARC, Tokai-mura, Japan
  
  Mag­net­ic alloy cav­i­ties are used for both MR and RCS syn­chrotrons. Both cav­i­ty sys­tems op­er­ate suc­cess­ful­ly and they gen­er­ate a high­er volt­age than could be achieved by an or­di­nary fer­rite cav­i­ty sys­tem. For the fu­ture up­grade of J-PARC, a high­er RF volt­age is need­ed. A new RF cav­i­ty sys­tem using the ma­te­ri­al, FT3L, is de­signed to achieve this high­er field gra­di­ent. A large pro­duc­tion sys­tem using an old cy­clotron mag­net was con­struct­ed to an­neal 85-cm size FT3L cores in the J-PARC Hadron Ex­per­i­ment Hall. The muSR (Muon Spin Ro­ta­tion/Re­lax­ation/Res­o­nance) Ex­per­i­ments were also car­ried out to study the mag­net­ic alloy. The sta­tus of de­vel­op­ment on the J-PARC site and a new RF sys­tem de­sign will be re­port­ed.  
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