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耐放射線性PEEKケーブルの開発

Development of radiation resistant PEEK insulation cable

三尾 圭吾; 荻原 徳男; 古郡 永喜*; 荒井 秀幸*; 西澤 代治*; 西殿 敏朗*; 引地 裕輔

Mio, Keigo; Ogiwara, Norio; Furukori, Hisayoshi*; Arai, Hideyuki*; Nishizawa, Daiji*; Nishidono, Toshiro*; Hikichi, Yusuke

J-PARC 3GeV RCS真空システム機器に用いる、耐放射線性を有するPEEKケーブルの開発を行った。使用するケーブルは、ノンハロゲン性、10MGy以上の耐放射線性,高難燃性が要求される。ケーブルの開発では、絶縁材料の候補から、ノンハロゲン性、耐放射線性、及び高難燃性を満足し、かつ伸び率が比較的大きいPEEK樹脂を絶縁材料として選定した。PEEKケーブルの耐放射線性を実証するため、$$gamma$$線照射試験を行った。ここでは、樹脂の基本的な照射特性試験、実機相当ケーブルでの電気的特性試験、並びに、耐延焼性試験を実施した。それぞれの試験項目について、10MGyの耐放射線性を確認した。

Material characterization and development has been carried out for cable insulation suitable for use in the J-PARC 3-GeV RCS radiation environment. In spite of its high cost, PEEK (polyether-ether-ketone) has emerged as the leading candidate satisfying requirements of being non-halogen based, highly incombustible and with radiation resistant at least 10 MGy, along with the usual mechanical characteristics such as good elongation at break, which are needed in a cable insulation. $$gamma$$-ray irradiation tests have been done in order to study radiation resistance of PEEK cable. Further, mechanical, electrical and fire retardant characteristics of a complete cable such as would be used at the J-PARC RCS were investigated. As a result, PEEK cables were shown to be not degraded by radiation up to at least 10 MGy, and thus could be expected to operate stably under the 3-GeV RCS radiation environment.

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