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超伝導磁石用高分子材料の低温耐放射線性; 機械特性

$$gamma$$-ray irradiation effects on polymeric materials in superconducting magnets; Mechanical properties

中本 建志*; 大畠 洋克*; 荻津 透*; 木村 誠宏*; 槙田 康博*; 山本 明*; 出崎 亮; 後閑 麻代*; 森下 憲雄; 伊藤 久義

Nakamoto, Tatsushi*; Ohata, Hirokatsu*; Ogitsu, Toru*; Kimura, Nobuhiro*; Makida, Yasuhiro*; Yamamoto, Akira*; Idesaki, Akira; Gokan, Mayo*; Morishita, Norio; Ito, Hisayoshi

大強度陽子加速器施設(J-PARC)のニュートリノビームラインに設置される超伝導磁石システムにおいて電気絶縁材や構造材として使用される高分子材料について、曲げ強度や引き裂き強度等の機械特性に及ぼす低温(77K)における放射線照射の影響を調べ、耐放射線性を評価した。その結果、これらの高分子材料が低温で10MGy照射後も特性を維持しており、十分な耐放射線性を有することを実験的に確認することができた。

A Superconducting magnet system will be adopted for the J-PARC neutrino beam line. GFRPs whose matrices are phenol resin and epoxy resin, and polyimides are used as structural materials and electrical insulation. Radiation resistance of these polymeric materials is very important, because they are exposed to high radiation field. In this work, specimens were irradiated by $$gamma$$ rays with the maximum dose beyond 10 MGy at liquid nitrogen temperature (77K), and the mechanical properties were investigated. It was verified experimentally that the polymeric materials have sufficient radiation resistance for the using in the J-PARC neutrino beam line.

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