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成果報告書詳細
管理番号20170000000385
タイトル*平成28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2017/7/7
報告書年度2016 - 2016
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) FY2016 Annual Report

(1) Improvement of performance, yield and reliability in superconducting joint.
The process conditions of the persistent superconducting joint (PS joint) have been examined to obtain the high performance joint with low resistivity and high current. Additionally we developed a test device to measure low resistance by measuring magnetic field decay in a one-turn-loop that consisted of a REBCO wire and a PS joint. In one-turn-loop test, the resistivity of 9.7×10-13 Ω at 30 K was achieved on the PS joint.
Yield of resistivity in a PS joint depended on surface pressure between tapes. The surface pressure was measured by a pressure sensitive paper; consequently, pressure along wide direction of the tape was not uniform. We are developing a tool that suppresses variation of the pressure.
(2) Development of structure of superconducting joint for MRI magnet
The environmental conditions of a PS joint in MRI magnet was examined and simulated, for example temperature and magnetic field. Test equipment that examines superconducting performance and mechanical performance in simulated MRI’s condition has been designed. The equipment that used a 12-T superconducting magnet of NIMS and a modified probe cooled with a cryo-cooler measured the critical current of the wire at various temperatures. To examine the mechanical performance of the wire, the wire that wind on a disk is measured in magnetic field during current loading. However, when the joint bends along a curve, the PS joint is possibility deteriorated by mechanical stress. Now we are examining the sample shape not to deteriorate the performance of the PS joint.
(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. The spray coating machine of Apeiros was provided. A good thin coated-film on slide-plate was achieved by adjusting volume and pressure of the splay.
An small-size coil system to simulate the operating condition of the joint in a MRI magnet was designed. Evaluation of the persistent current will be conducted by a NMR Teslameter of METROLAB. Some coil specifications were designed concerning to intrinsic resistance, length and number of the joint with 4-mm width tape. We will also re-design them with 6-mm width tape.
The validity of a low-tension winding method that avoids degrading the REBCO HTS tapes was investigated by fabricating two short length coils with many layers and two long length coils with few layers. Each coil was measured in gas-cooled environment with external magnetic field. The critical currents of the coils corresponded with those of the wire in the temperature region where the wire critical current anisotropy is low, hence, no degradations of the coils due to winding were observed. Regarding the coil performance margin, the short length coils burned at over 300 A, while the long length coils deteriorated by mechanical stress at 10 T. The subject of cooling and mechanical support in the coil will need to be addressed.
A cryostat owned by NIMS was selected for the low resistance measurement, and necessary components were purchased after the design of the measurement equipment.
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