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Hajima, Ryoichi; Minehara, Eisuke; Nagai, Ryoji
Nuclear Instruments and Methods in Physics Research A, 528(1-2), p.340 - 344, 2004/08
Times Cited Count：1 Percentile：10.27(Instruments & Instrumentation)We propose a full-DC injector for an energy-recovery linac. The injector is based on a 2MeV DC accelerator commercially available (Dynamitron type) combined with a photo cathode. The bunched beam from the DC accelerator is merged into the ERL loop and injected to a superconducting buncher booster, which accelerates the beam up to 20MeV. The bunch booster is operated in "partial energy-recovery mode", in which we can reduce the capacity of RF main couplers down to 10kW level even for high-average current operation, 100mA. We present a result of beam dynamics simulation and RF system optimization.
Matsuda, Norihiro; Nakashima, Hiroshi; Kasugai, Yoshimi; Sasamoto, Nobuo*; Kinno, Masaharu*; Kitami, Takayuki; Ichimura, Takahito; Hori, Junichi*; Ochiai, Kentaro; Nishitani, Takeo
Journal of Nuclear Science and Technology, 41(Suppl.4), p.74 - 77, 2004/03
In high power proton accelerator facilities, concrete shield can be highly activated, which makes maintenance work quite difficult. So, a low-activationized concrete (limestone concrete) is to be partially adopted as a concrete shield for Japan Proton Accelerator Research Complex (J-PARC) aiming at reducing 
-ray exposure dose during maintenance period. A new quantity, 
Na-equivalent, was introduced as a criterion to assure effectiveness of the low-activationized concrete. In order of its verification, powdered low-activationized concrete and ordinary one were irradiated using FNS at JAERI. The measurements were analyzed by a shielding design code system being used for J-PARC, showing that the calculations reproduce the measured induced activity within a factor of 2. Furthermore, by using the same code system, -ray exposure dose was calculated for the configuration of J-PARC to find out that -ray exposure dose by the low-activationized concrete was about 10 times lower than that by the ordinary concrete in a period of less than a few days after operation.
Kai, Tetsuya; Maekawa, Fujio; Kosako, Kazuaki*; Kasugai, Yoshimi; Takada, Hiroshi; Ikeda, Yujiro
JAERI-Data/Code 2001-016, 82 Pages, 2001/03
JAERI-Data-Code-2001-016.pdf:4.22MB
no abstracts in English
Okumura, Yoshihiro; Matsuda, Shinzaburo; Mizutani, Yasuhiko*; Ohara, Yoshihiro; Oga, Tokumichi
Review of Scientific Instruments, 51(6), p.728 - 734, 1980/06
Times Cited Count：23 Percentile：90.66(Instruments & Instrumentation)no abstracts in English
