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成果報告書詳細
管理番号20180000000228
タイトル*平成29年度中間年報 高温超電導実用化促進技術開発 高磁場マグネットシステム開発 高温超電導高安定磁場マグネットシステム技術開発(古河電気工業株式会社)
公開日2018/6/2
報告書年度2017 - 2017
委託先名古河電気工業株式会社
プロジェクト番号P16006
部署名省エネルギー部
和文要約
英文要約Title; Technology Development to Promote Commercialization of High-Temperature Superconductivity /Development of High-Field Magnet System /High-Temperature superconducting high-stable magnetic-field magnet system (FY2016-FY2018)  FY2017 Annual Report

(1) Improvement of performance, yield and reproductivity in superconducting joint.
Low resistivity of 10-15 ohm at 30K, 10-14 ohm at 30 K to 50 K were obtained by the measurement of one-turn loop consisted of a persistent superconducting joint. We found that the performance of the superconducting joint was influenced by a shape of the REBCO tape, critical current of the joint was achieved with 70 A class by new methods.
The equipment for measuring temperature and magnetic performance of a superconducting joint resistance was consisted of s 12-T magnet and probe of a GM refrigerator. Critical current of a test sample was measured by Furukawa and NIMS. The measurement in various temperature and magnetic field will be conducted in the next year.

(2) Structure of superconducting joint for MRI magnet
Since a superconducting coil received magnetic force in operation, a corresponding performance of the superconducting joint is needed to estimate against a magnetic force. NIMS made the equipment that consisted of a circular plate and electrodes, and will measure it in the next year.

(3) Technology development and implement of superconducting joint in a MRI magnet manufacture process.
A spray-coating method is applicable to coat a superconducting material on a REBCO tape. A good thin uniformity coated-film on the tape was plated by adjusting conditions of the splay. The Ic value was achieved with over 70 A in the optimum condition.
Current leads of the HTS coil were designed by using 6 mm width tape, and three types of the current lead were fabricated, measured, and evaluated. An elementary coil was fabricated by a manual work, but a tape of the coil was damaged from a cause of manual work. The automatic winding machine was introduced, and JASTEC fabricated a small-size coil by the machine to estimate the machine performance.
NIMS has designed a small-size coil system, which evaluates the superconducting joint simulated for a MRI magnet. The equipment was built by using a sample stage and GM refrigerator, and the coil stage was cooled at design temperature. Moreover, The PCS (Persistant Current Switch) was measured, and we evaluated the performance of the PCS ON/OFF and the temperatures around the PCS in the case of PCS heater operating.
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