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Short sample tests of aluminum-stabilized superconductors for Large Helical Device

T. Mito, K. Takahata, N. Yanagi, S. Yamada, O. Motojima1993年Fusion Engineering and DesignIF 1.7出版社

AbstractWe have been developing aluminum-stabilized superconductors for the helical coils of the Large Helical Device (LHD). Two types of conductors, Design-M and KISO-4B, were selected to proceed to the full-scale short sample tests. The test facility for full-scale conductors consists of 100 kA vapor-cooled current leads, 9 T background field split coils, a cryostat and a 75 kA dc power supply. Since both conductors have multi-layered strand cables without transposition, it is feared that an uneven current distribution between strands may cause degradation of the critical current. To measure the current distribution inside the conductor, a new method using a pick up coil was introduced. Using this experimental setup, we have measured the critical current, the current distribution inside the conductor and the stability of both full-scale conductors.

日本語訳

我々は、大型ヘリカル装置(LHD)のヘリカルコイル用にアルミニウム安定化超伝導体を開発してきた。2種類の導体、Design-MおよびKISO-4Bが、本格的な短尺試料試験に進むために選定された。本格的な導体用試験設備は、100 kAの蒸気冷却電流リード、9 Tのバックグラウンド磁場分割コイル、クライオスタット、および75 kAの直流電源から構成される。両導体は、転位のない多層ストランドケーブルを有するため、ストランド間の電流分布の不均一が臨界電流の劣化を引き起こす可能性が懸念される。導体内部の電流分布を測定するために、ピックアップコイルを用いた新しい方法が導入された。この実験設備を用いて、我々は両方の本格的な導体の臨界電流、導体内部の電流分布、および安定性を測定した。

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