Design, Fabrication, and Persistent Current Operation of the REBCO Floating Coil for the Plasma Experimental Device Mini-RT
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- OGAWA Yuichi
- Graduate School of Frontier Sciences, University of Tokyo
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- MORIKAWA Junji
- Graduate School of Frontier Sciences, University of Tokyo
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- UCHIJIMA Kenichiro
- Graduate School of Frontier Sciences, University of Tokyo
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- HOSAKA Yuichiro
- Graduate School of Frontier Sciences, University of Tokyo
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- KAWAI Chika
- Graduate School of Frontier Sciences, University of Tokyo
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- IBANO Kenzo
- Graduate School of Frontier Sciences, University of Tokyo
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- MITO Toshiyuki
- National Institute for Fusion Science
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- YANAGI Nagato
- National Institute for Fusion Science
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- NATSUME Kyohhei
- National Institute for Fusion Science
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- TERAZAKI Yoshiro
- Graduate University for Advanced Studies
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- IWAKUMA Masataka
- Graduate School of Information Science and Electrical Engineering, Kyushu University
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- TOMIOKA Akira
- Fuji Electric Co., Ltd.
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- NOSE Shinichi
- Fuji Electric Co., Ltd.
抄録
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.
収録刊行物
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- Plasma and Fusion Research
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Plasma and Fusion Research 9 (0), 1405014-1405014, 2014
一般社団法人 プラズマ・核融合学会
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詳細情報 詳細情報について
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- CRID
- 1390001205253135360
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- NII論文ID
- 130004678548
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- ISSN
- 18806821
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可