Japanese contributions to the procurement of the ITER superconducting magnet

ITER超伝導マグネット調達における日本の役割

奥野 清; 中嶋 秀夫; 杉本 誠; 礒野 高明

Okuno, Kiyoshi; Nakajima, Hideo; Sugimoto, Makoto; Isono, Takaaki

ITER計画では、2005年6月にモスクワで開催された第2回6極閣僚級会合において、ITER本体施設のカダラシュへの設置が正式に決定された。このサイトの決定により、ITERはその実現に向けて大きな一歩を踏み出した。ITER計画には日本,中国,欧州連合,韓国,ロシア連邦,米国の6極が参加し、ITERトカマク本体のほとんどの構成機器を物納という形でこれら6極が調達する。このうち超伝導マグネットに関しては主要部分を日本及びEUが分担する。このため、日本原子力研究開発機構では、ITER工学設計活動で得られた成果をもとに、トロイダル磁場コイルを中心に、実規模での要素試作による製作プロセスや品質保証技術の確立、量産技術の実証、さらに設計の合理化など、実機製作のための技術基盤の確立を行っている。本件では、これら日本におけるITER建設準備のための技術活動の成果について発表する。

Japan is expected to make a major contribution to the procurement of the ITER superconducting magnet system. The ITER magnet system consists of 18 TF coils, one CS with six modules and six PF coils. The TF coils and CS have major features in unprecedented size of the magnets and structures and operations at 11 to 13 T high fields that require NbSn superconductor. Because of these features, significant efforts were made towards developing superconducting magnet technology to a level that will allow the ITER magnets to be built with confidence. The construction and testing of the CS and TF model coils have therefore been performed during the ITER Engineering Design Activity (EDA), and all ITER RD goals have been achieved. Based on these achievements, further development activities are now being performed at JAERI in tight collaboration with industry for the preparation of the ITER construction. The activities include analytic studies on design improvement and optimization, manufacturing studies to identify the detailed fabrication processes and tools, and manufacturing demonstrations on full-scale structural components (several tens of tons) such as made of new cryogenic materials, JJ1 and strengthened 316LN. Results from these activities will provide firm technical basis to achieve required performance of the magnets while maintaining both project schedule and cost and to reduce technical risks that may happen during the manufacturing phase.