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Akita, Koichi; Nakatani, Hayato*; Ogihara, Shinji*; Shobu, Takahisa; Shiro, Ayumi*; Igawa, Naoki; Shimojo, Yutaka
SPring-8/SACLA Riyo Kenkyu Seikashu (Internet), 6(1), p.105 - 108, 2018/01
no abstracts in English
Nakatani, Hayato*; Kajiwara, Kentaro*; Akita, Koichi; Ogihara, Shinji*
Proceedings of 14th Japan International SAMPE Symposium & Exhibition (JISSE-14) (USB Flash Drive), 6 Pages, 2015/12
Inoue, Takashi
Kyoka Purasuchikkusu, 60(7), p.269 - 270, 2014/07
In ITER as a thermonuclear fusion experimental reactor being conducted by an international project, a large bore insulator ring of about 1.8 m in diameter is required for generation of 1 MeV, 40 A ion beam for plasma heating by Neutral Beam Injector. At JAEA, R&D has been carried out for development of such large bore insulator ring made of ceramics, and in parallel, ion beam experiments have been carried out with insulator rings made of FRP. The experiments have troubled with frequent high voltage breakdowns after outgas from FRP. Finding melt epoxy traces at triple junction (interface of vacuum, metal and FRP as dielectric material), local stress at the triple junction has been mitigated by mounting a large metal structure, so called stress ring. As a result, acceleration of 0.98 MeV, 185 A/m
hydrogen negative ion beam has successfully achieved in short pulses, where the requirement by ITER is 1 MeV and 200 A/m.
Idesaki, Akira; Morishita, Norio; Ito, Hisayoshi; Kamiya, Tomihiro; Nakamoto, Tatsushi*; Kimura, Nobuhiro*; Makida, Yasuhiro*; Ogitsu, Toru*; Ohata, Hirokatsu*; Yamamoto, Akira*
AIP Conference Proceedings 824, p.330 - 334, 2006/03
Polyimide films and glass fiber reinforced plastics (GFRPs) are used as insulating or structural materials for superconducting magnets in a neutrino beam line of the Japan Proton Accelerator Research Complex (J-PARC). It is indispensable to evaluate radiation resistance of these materials, because they are required to keep their electrical and mechanical properties in a high radiation field of 30 kGy/year at low temperature of 4 K. In this work, the gas evolution resulting from chemical reactions induced in the polyimide films and GFRPs by 
ray irradiation at 77 K was investigated. It was found that the main component of the evolved gas is hydrogen. The amount of hydrogen evolved from the superconducting magnet system used in the neutrino beam line was estimated to be 0.37 mol/year (0.01 L/year as the volume of liquid hydrogen). It indicates that the hydrogen evolved from the organic materials does not influence on the operation of the helium purifying system.
S.M.Spiessberger*; K.Humer*; H.W.Weber*; E.K.Tschegg*; H.Gerstenberg*; Udagawa, Akira
Advances in Cryogenic Engineering Materials, Vol.44, p.191 - 195, 1998/00
no abstracts in English
; Kusaka, Makoto*
JAERI-Tech 97-025, 20 Pages, 1997/07
no abstracts in English
; *
Gijutsu Kenkyukai Hokoku (Mombusho Kokuritsu Temmondai, Denki Tsushin Daigaku), p.111 - 114, 1997/03
no abstracts in English
Udagawa, Akira
Isotope News, (513), p.10 - 11, 1997/02
no abstracts in English
Kudo, Hisaaki; Sasuga, Tsuneo; Seguchi, Tadao; Katsumura, Yosuke*
Polymer, 37(21), p.4663 - 4665, 1996/10
Times Cited Count：21 Percentile：64.93(Polymer Science)no abstracts in English
*; *; Okawa, Yoshinao
Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.1051 - 1052, 1996/00
no abstracts in English
Kudo, Hisaaki; Kasai, Noboru; Sasuga, Tsuneo; Seguchi, Tadao
Radiation Physics and Chemistry, 48(1), p.95 - 100, 1996/00
Times Cited Count：18 Percentile：80.23(Chemistry, Physical)no abstracts in English
Kudo, Hisaaki; Kasai, Noboru; Sasuga, Tsuneo; Seguchi, Tadao
Radiation Physics and Chemistry, 48(3), p.695 - 696, 1996/00
Times Cited Count：2 Percentile：24.71(Chemistry, Physical)no abstracts in English
Udagawa, Akira; Yudate, Kozo*; Kudo, Hisaaki; Sasuga, Tsuneo; Morino, Yoshiki*; Seguchi, Tadao
JAERI-Tech 95-007, 25 Pages, 1995/02
no abstracts in English
Udagawa, Akira; Sasuga, Tsuneo; Seguchi, Tadao
DEI-91-134, p.41 - 47, 1991/12
no abstracts in English
*; *; Udagawa, Akira; Sasuga, Tsuneo; Seguchi, Tadao; Hama, Yoshimasa*
Advanced Composite Materials, 1(4), p.321 - 331, 1991/00
no abstracts in English
Udagawa, Akira; Seguchi, Tadao
EIM-90-121, p.39 - 45, 1990/12
no abstracts in English
Udagawa, Akira; Sasuga, Tsuneo; Seguchi, Tadao; *; *; *; *; *; Sonoda, Katsumi*; *
JAERI-M 89-203, 20 Pages, 1989/12
no abstracts in English
*; *; Udagawa, Akira; Sasuga, Tsuneo; Seguchi, Tadao; Hama, Yoshimasa*
EIM-89-120, p.61 - 69, 1989/12
no abstracts in English
Sasuga, Tsuneo; Egusa, Shigenori; Udagawa, Akira; Seguchi, Tadao; Tamura, Naoyuki; *; *; *; *; *; et al.
JAERI-M 88-238, 28 Pages, 1988/11
no abstracts in English
Udagawa, Akira; Egusa, Shigenori; Sasuga, Tsuneo; Seguchi, Tadao; Ono, Toshio*; *; *; *; Hashimoto, Osamu*; Sonoda, Katsumi*; et al.
JAERI-M 88-047, 27 Pages, 1988/03
no abstracts in English
