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成果報告書詳細
管理番号20190000000244
タイトル*平成30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(国立研究開発法人産業技術総合研究所)
公開日2019/5/14
報告書年度2018 - 2018
委託先名国立研究開発法人産業技術総合研究所
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: Project for the Promotion to the Commercialization of High-Temperature Superconductivity Technology. Development of High Magnetic Field Magnet System. Development of HTS High Stable Magnet System Technology. (FY2016-FY2018) FY2018 Annual Report

3) Development of Superconducting Joint Technology for High-Tc Superconductors
1. Superconducting Joint Technology
a. Low magnetic field / low temperature stage for superconducting joints
We have been developing "Low magnetic field / low temperature assisting technology" for superconducting joints to open the choices of superconducting joint processes and materials. This fiscal year, we demonstrated that temperature of tens of joints of conduction-cooled magnets could be maintained at around 4K with a commercial GM refrigerator.

b. Joint Technology using Metallic Paste
We successfully developed paste with superconducting particles and demonstrated making joints using the superconducting paste.

c. Joint Technology by dissimilar superconductors
We are developing connection technology (Indirect connection) for REBCO tape conductors using heterogeneous superconducting materials specifically LTS materials such as Nb. In this year, we have succeeded in depositing high quality Nb thin film on REBCO films and estimated joint resistivity.

d. Connecting conductors between HTS coils
We are investigating various superconducting wires for connection wires of coil system and/or Persistent Current Switch (PCS). In this fiscal year, we evaluated thermal and electrical properties of various superconducting wires. We found that iron-based superconducting wires have almost the same heat capacity and electrical resistivity as MgB2 wires and they are feasible for PCSs.

2. Joint Resistance Evaluation Technology
We have been successfully developed a joint resistance evaluation system which can measure ultra-low resistance ranging pico-ohm - nano-ohm at variable temperatures in direction controllable magnetic fields.

4) Protection of HTS magnets
b. Protection for persistent current mode
We experimentally verified the “Co-wound method” that is to detect normal zone in HTS coils and the “Resistive-short method” that is to transfer current from quenched coil to the other coils. Current was quickly transferred by electromagnetic relay even in cryogenic temperature. We also numerically evaluated hot spot temperature of HTS coils varying thickness of HTS coated conductors and revealed presence of optimum thickness of copper stabilizer.
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