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Hattori, T.

Paper Title Page
MOPAN039 Development of Hybrid Type Carbon Stripper Foils with High Durability at >1800K for RCS of J-PARC 242
  • I. Sugai, H. Kawakami, M. Oyaizu, A. Takagi, Y. Takeda
    KEK, Ibaraki
  • T. Hattori, K. K. Kawasaki
    RLNR, Tokyo
  • Y. Irie
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  The Japan Proton Accelerator Research Complex (J-PARC) requires thick carbon stripper foils (250-500 ug/cm2) to strip electrons from the H- beam supplied by the linac before injection into the RCS of J-PARC. For this high-intensity H- beam and circulating bunch beam, which gives much damage to conventional carbon stripper foils. Thus carbon stripper foils with high durability at 1800K produced by energy deposition in the foil are indispensable for this accelerator. Recently, we have successfully developed hybrid type thick boron mixed carbon stripper foils (HBC-foil). Namely, the lifetime measurement of the foils was tested by using a 3.2 MeV, Ne+ DC beams of 2.5 uA, in which a significant amount of energy was deposited in the foils. The maximum lifetime was found to be extremely long, 30-and 250-times longer than those of Diamond and commercially available best carbon foils, respectively. The foils were also found to be free from any shrinkage, and to show an extremely low thickness reduction rate even at a high temperature of 1800K during long beam irradiation. In this conference the foil preparation procedures and lifetime measurements with a 3.2 MeV, Ne+ is presented.