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Kawakami, H.

Paper Title Page
MOPEA056 Lifetime Measurement of HBC Stripper Foil using 3.2 MeV Ne+ for RCS of J-PARC 202
 
  • Y. Takeda, Y. Irie, H. Kawakami, M. Oyaizu, I. Sugai, A. Takagi
    KEK, Ibaraki
  • T. Hattori, K.K. Kawasaki
    TIT, Tokyo
  
 

Japan Proton Accelerator Research Complex (J-PARC) requires thick carbon stripper foils (200-500 ug/cm2) to strip electrons from the H- beam supplied by the linac before injection into the Rapid Cyclic Synchrotron. A H- beam of 181MeV energy is injected into the 3 GeV Rapid Cycling Synchrotron (RCS) with a pulse length of 0.5 ms, a repetition rate of 25 Hz, and an average beam current of 200 μA. The H- ions are stripped into protons by a charge stripper foil in the injection section. For this high-energy and high-intensity beam, the conventional carbon stripper foils will be ruptured in a very short time. Thus, long-lived thick carbon stripper foils are needed to this high-power accelerator. For this purpose, we are described R and D of long-lived Hybrid Boron-mixed Carbon foils (HBC-foils) of 100 - 500 μg/cm2 by arc discharge method. The preparation procedure is described and lifetime measurement by using a 3.2MeV Ne+ DC beam of 2-3 μA are reported.