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Saitoh, Y.

Paper Title Page
THPEA081 Vacuum Surface Scrubbing by Proton Beam in J-PARC Main Ring 3858
 
  • M. Uota, Y. Hashimoto, Y. Hori, H. Matsumoto, Y. Saitoh, M. Shimamoto, M. Tomizawa, T. Toyama
    KEK, Ibaraki
  
 

In J-PARC 50GeV syn­chrotron ring, large vac­u­um pres­sure rises above 10-3 Pa are found at 30GeV ac­cel­er­a­tion final stage of in­ten­si­ty over 1013 pro­tons per pulse in the cham­bers of the in-vac­u­um elec­tro­stat­ic sep­tum mag­net for the slow-ex­trac­tion(SX), mag­net­ic sep­tum for SX, and the kick­er mag­net for the fast-ex­trac­tion. This pres­sure rise de­pends on beam in­ten­si­ty and peak-cur­rent, and can be re­duced by con­tin­u­ous beam op­er­a­tions, such as scrub­bing with pro­ton beam, sec­ondary emis­sion elec­trons and other cations of re­main­ing gasses or des­orp­tions.