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超伝導材料と導体

Superconducting materials and conductors

竹内 孝夫*; 木須 隆暢*; 小泉 徳潔

Takeuchi, Takao*; Kisu, Takanobu*; Koizumi, Norikiyo

核融合炉では高磁場中で数万アンペアの大電流導体が大量に必要となり、臨界電流密度が高く、コストを低減するために長尺性や量産性にも優れた超伝導線が必要とされる。これら超伝導導体の開発、及び技術的課題について解説する。また、大電流超伝導導体で観測される特有の不安定現象についても解説し、これの解決のために実施された研究成果についても紹介する。

A large current, such as a few ten kA, superconducting conductor is required for a fusion magnet. Superconducting strand having high critical current density and good drawing ability is therefore necessary. The development and technical issues of these superconductors are explained. In addition, instability particularly observed in a large current superconductor is introduced and studies about such instability are also described.

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