Author: Yamazaki, Y.
Paper Title Page
MOPF15 Advanced uses of a Current Transformer and a Multi-Wire Profile Monitor for Online Monitoring of the Stripper Foil Degradation in the 3-GeV RCS of J-PARC 239
 
  • P.K. Saha, H. Harada, S. Hatakeyama, N. Hayashi, H. Hotchi, M. Kinsho, K. Okabe, R. Saeki, K. Yamamoto, Y. Yamazaki, M. Yoshimoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  
  We have es­tab­lished ad­vanced and so­phis­ti­cated uses of a Cur­rent Trans­former (CT) and a Multi-Wire Pro­file Mon­i­tor (MWPM) for mea­sur­ing as well as on­line mon­i­tor­ing of the strip­per foil degra­da­tion dur­ing user op­er­a­tion of the 3-GeV Rapid Cy­cling Syn­chro­tron (RCS) in Japan Pro­ton Ac­cel­er­a­tor Re­search Com­plex (J-PARC). An in­com­ing neg­a­tive hy­dro­gen beam from the Linac is stripped to a pro­ton beam by using a strip­per foil placed in the RCS in­jec­tion area. Foil degra­da­tion such as, foil thin­ning and pin­hole for­ma­tion are be­lieved to be signs of a foil break­ing. A sud­den foil break­ing is not only a load on the ac­cel­er­a­tor down­time but also raises main­te­nance is­sues. In a high in­ten­sity ac­cel­er­a­tor like RCS, a proper mon­i­tor­ing sys­tem of the foil is thus im­por­tant in order to avoid such above is­sues by re­plac­ing the foil with a new one in the sched­uled main­te­nance day. The thick­ness of the stip­per foil used for the pre­sent 181 MeV in­jec­tion en­ergy is 200 ug/cm2, where a change of foil thick­ness as low as 1% or even less has al­ready been suc­cess­fully mon­i­tored by uti­liz­ing the pre­sented method. Mea­sured data for the last 6 months op­er­a­tion of the RCS will be pre­sented.  
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