2018 Fiscal Year Final Research Report

Development of a pulse current induced fusion splicing method for superconducting joints and their characterization techniques

Research Project

PDF

Project/Area Number	17K18885
Research Category	Grant-in-Aid for Challenging Research (Exploratory)
Allocation Type	Multi-year Fund
Research Field	Electrical and electronic engineering and related fields
Research Institution	Kyushu University
Principal Investigator	Kiss Takanobu 九州大学, システム情報科学研究院, 教授 (00221911)
Co-Investigator(Kenkyū-buntansha)	井上昌睦福岡工業大学, 工学部, 教授 (80346824) 東川甲平九州大学, システム情報科学研究院, 准教授 (40599651) 鈴木匠九州大学, システム情報科学研究院, 助教 (70756238)
Project Period (FY)	2017-06-30 – 2019-03-31
Keywords	超伝導接続 / 高温超電導線材 / 永久電流 / 超伝導マグネット / 磁気顕微鏡 / 電流計測
Outline of Final Research Achievements	This study clarifies the possibility of superconducting joint technology applicable to the coil winding using high-temperature superconducting wires, and intends to establish a basic technology for the persistent current operation of the high-temperature superconducting magnet which enables the generation of steady strong magnetic field. This study examines the possibility of pulse current fusing method, and establishes a method for measuring the ultra low resistance characteristic of the joint locally and with high accuracy. Using this technique, we carried out measurements under cryogenic temperature and magnetic field for superconducting joint using PbSnBi solder connection, and showed that the distribution of local superconducting current density Jc and the distribution of critical temperature Tc inside the joint can be evaluated.
Free Research Field	超伝導工学、計測工学
Academic Significance and Societal Importance of the Research Achievements	本研究によって、液体ヘリウムを用いない高温超伝導線材を用いた高磁界NMRや医療用MRIシステムの実現において不可欠な技術である永久電流スイッチの実現を加速する事が可能となる。これらの装置の実現は、先進医療や先端バイオセンシング技術として大きな波及効果が期待できる。また、磁気浮上鉄道やエネルギー貯蔵など、超伝導マグネットの産業応用という観点からも、運輸やエネルギーの分野において重要な貢献が期待できる。