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成果報告書詳細
管理番号20180000000224
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(国立研究開発法人産業技術総合研究所)
公開日2018/6/2
報告書年度2017 - 2017
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) FY2017 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, a cryostat with two refrigerators to maintain temperatures of HTS coils and joints were fabricated for demonstration of our superconducting joint technology.

b. Joint Technology using Metallic Paste
Concerning the development of jointing technique using the paste including nano-sized metal particles, the influence of the components in the jointing have been investigated.
Concerning the development of paste with superconducting particles, we examined the selection of resin, hardener and solvent for Nb particles and found them which do not affect superconducting properties.

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 Nb thin film on SrTiO3 (001) single crystal substrate at room temperature.

d. Connecting conductors between HTS coils
We are investigating various superconducting wires for connection wires of coil system and Persistent Current Switch (PCS). In this fiscal year, we fabricated iron-based superconducting tape wires whose thickness is 0.2mm and length is 1m and achieved 70,000A/mm2 at 0.5T, 4.2K.

2. Joint Resistance Evaluation Technology
Our target in this development of a joint resistance evaluation system is to build up a system with which one can measure ultra-low resistance ranging pico-ohmーnano-ohm at variable temperatures in direction controllable magnetic fields. In this fiscal year, we developed cancellation coils to reduce stray fields at sample space. Fabrication and preparation of components of the joint resistance evaluation system are in progress.

4) Protection of HTS magnets
b. Protection for persistent current mode
Numerical simulation analyses were conducted for a model magnet composed with multiple sub-pancake coils to study on parameters of quench protection methods for the safe protection of the magnet from quench damage. It was shown that the safe limits of the parameters of our new quench protection method with the resistive-short circuit are remarkably enlarged compared with those of the conventional method.
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