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Development of a Nb$$_{3}$$Al conductor for toroidal field coils

核融合炉用トロイダル磁場コイル用ニオブ・アルミ導体の開発

小泉 徳潔; 安藤 俊就*; 中嶋 秀夫; 松井 邦浩; 杉本 誠; 高橋 良和; 奥野 清; 木津 要; 三浦 友史; 土屋 勝彦; 逆井 章; 石田 真一

Koizumi, Norikiyo; Ando, Toshinari*; Nakajima, Hideo; Matsui, Kunihiro; Sugimoto, Makoto; Takahashi, Yoshikazu; Okuno, Kiyoshi; Kizu, Kaname; Miura, Yushi; Tsuchiya, Katsuhiko; Sakasai, Akira; Ishida, Shinichi

13T以下の磁場で運転されるTFコイル用導体として、Nb$$_{3}$$Sn導体が開発された。しかし、Nb$$_{3}$$Snは歪に弱く、磁場が高くなると性能低下が大きい。このため、13Tを超える磁場での使用は困難である。他方、Nb$$_{3}$$Alは歪に強く、潜在的にはNb$$_{3}$$Snより高い臨界電流値を有するため、次世代の超電導導体として考えられている。そこで、原研では80年代より、Nb$$_{3}$$Al導体の開発を行ってきた。第一段階では、素線の大量生産技術を開発した。第二段階で、大型コイルの開発を行い、定格点の134T-46kAまでの励磁に成功した。これらの成果から、JT-60SCのTFコイル導体として、Nb$$_{3}$$Al導体の開発も進めている。D型のコイルを製作し、成功裏に試験することができた。以上の結果は、16T級TFコイルNb$$_{3}$$Al導体の開発に多大な貢献をし、本開発は着実に進んでいる。

Nb$$_{3}$$Sn cConductors have already been developed for the TF coils operating at 13 T. However, the critical current of Nb$$_{3}$$Sn degrades due to a strain, and the amount of degradation becomes larger when the magnetic field increases, which set a limit of the Nb$$_{3}$$Sn application to a large coil at around 13 T. Nb$$_{3}$$Al is considered, therefore, to be a next generation superconductor, since the critical current of Nb$$_{3}$$Al is superior to that of Nb$$_{3}$$Sn and less sensitive against strains. JAERI has been developing Nb$$_{3}$$Al conductor since 80s. As the first step, mass production technique of Nb$$_{3}$$Al strands was established. In the second step, coil fabrication technique was developed and could successfully be charged to the nominal point of 13 T and 46 kA. From these advantages, JAERI is also promoting R&D activities to develop Nb$$_{3}$$Al TF coils for JT-60SC. The prototype Nb$$_{3}$$Al conductor has already been made. A D-shaped coil was fabricated and successfully tested. These activities constitute the basic approaches to develop TF coils whose operating field is expected to be around 16 T.

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