Design, Fabrication, and Persistent Current Operation of the REBCO Floating Coil for the Plasma Experimental Device Mini-RT

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概要

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• High-temperature superconductor technology has become remarkably advanced, and components such as current leads and magnets have been explored for their applicability to fusion. Especially, REBa2Cu3O7-δ (RE = rare-earth: REBCO) tape has been developed in research fields other than fusion, because of superior performance of REBCO in high magnetic fields. Here, we fabricated a REBCO coil with a radius of 150 mm and a total coil current of 55.2 kA, to be applied as an internal floating coil in Mini-RT, a plasma experimental device. This newly fabricated REBCO coil has replaced the Bi2Sr2Ca2Cu3O10 (BSCCO) coil developed in 2003, and has improved coil performance and plasma operation. A REBCO tape of width 4.3 mm was employed, and a 0.1 mm-thick copper laminate was attached for the countermeasure at the quench. In addition, the REBCO tape was wrapped in a polyimide sheet for electric insulation, increasing the total thickness of the REBCO tape to 0.27-0.28 mm. A persistent current switch was constructed from a small-turn REBCO winding with a heater formed from a stainless steel sheet. Solder joint of two REBCO tapes over a 30 mm length were employed, by overlapping their copper laminates. Persistent current, with a decay time ∼320 h, has been successfully achieved at 25 K operation temperature. This decay time corresponds to a resistance of ∼125 nΩ, roughly consistent with the total resistance of the seven joint sections in the persistent current circuit.

• 社団法人 プラズマ・核融合学会の論文

著者

• MITO Toshiyuki

  National Institute for Fusion Science

• YANAGI Nagato

  National Institute for Fusion Science

• Morikawa Junji

  Graduate School Of Engineering The University Of Tokyo

• Ogawa Yuichi

  Graduate School of Agriculture, Kyoto University

• NOSE Shinichi

  Fuji Electric Co.

• TERAZAKI Yoshiro

  Graduate University for Advanced Studies

• UCHIJIMA Kenichiro

  Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8568, Japan

• TOMIOKA Akira

  Fuji Electric Co., Ltd.

• IWAKUMA Masataka

  Graduate School of Information Science and Electrical Engineering, Kyushu University

• HOSAKA Yuichiro

  Graduate School of Frontier Sciences, University of Tokyo

• KAWAI Chika

  Graduate School of Frontier Sciences, University of Tokyo

• IBANO Kenzo

  Graduate School of Frontier Sciences, University of Tokyo

• NATSUME Kyohhei

  National Institute for Fusion Science

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