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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
Kudo, Hisaaki; Sasuga, Tsuneo; Seguchi, Tadao; Katsumura, Yosuke*
Polymer, 37(21), p.4663 - 4665, 1996/10
Times Cited Count：21 Percentile：64.98(Polymer Science)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：80.24(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; Sasuga, Tsuneo; Seguchi, Tadao
DEI-91-134, p.41 - 47, 1991/12
no abstracts in English
Udagawa, Akira; Seguchi, Tadao
EIM-90-121, p.39 - 45, 1990/12
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
