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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 Nb3Sn and less sensitive against strains. JAERI has been developing Nb$$_{3}$$Al conductor since 80s. As the first step, mass production technique of Nb3Al 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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