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Takeda, Y.

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.  
MOPAN040 Comparative Study on Lifetime of Stripper Foil using 650keV H- Ion Beam 245
  • A. Takagi, I. Sugai, Y. Takeda
    KEK, Ibaraki
  • C. S. Feigerle
    University of Tennessee, Knoxville, Tennessee
  • Y. Irie
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • M. A. Plum, R. W. Shaw
    ORNL, Oak Ridge, Tennessee
  Funding: This work is supported by the Japan Society for the Promotion of Science, under contract No. 18540303.

Thick carbon stripper foils of >300 μg/cm2 will be used as a stripping of H-ion beam for 3GeV Rapid Cycling Synchrotron (3GeV-RCS) of the J-PARC. The carbon foils with long lifetime even at >1800 K are required. For this purpose, we have developed a new irradiation system for the lifetime measurement using high current pulsed and dc H- beams of the KEK Cockcroft-Walton accelerator. These high power 650keV H- Ion beams can simulate the high energy deposition in carbon stripper foils at the J-PARC RCS. An automatic data acquisition system is also developed for recording the data of foil temperature and irradiated beam current. The Hybrid Boron mixed Carbon (HBC) stripper foils, which are developed at KEK are irradiated by high current H- ion beam up to 2000 K. A few SNS-diamond and commercially available carbon (CM) foils are also tested for comparing with HBC-foils. The results of the lifetime measurement of HBC and SNS-diamond including CM stripper foils are reported.