Reel-to-reel fast scanning magnetic microscopy of long length HTS tapes to resolve local inhomogeneity of critical currents

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360122
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Electronic materials/Electric materials
• Research Institution: Kyushu University
• Principal Investigator: KISS Takanobu 九州大学, システム情報科学研究科(研究院, 教授 (00221911)
• Co-Investigator(Kenkyū-buntansha): INOUE Masayoshi 九州大学, システム情報科学研究院, 准教授 (80346824) ; HIGASHIKAWA Kohei 九州大学, システム情報科学研究院, 准教授 (40599651)
• Research Collaborator: IZUMI Teruo ; IBI Akira ; MACHI Takato
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 高温超伝導線材 / 臨界電流 / 均一性 / 欠陥検出 / マルチスケール / 磁気顕微鏡 / ハイブリッド顕微鏡 / 非破壊・非接触

Outline of Final Research Achievements

We have developed a non-destructive and fast characterization method of spatially resolved critical current (Ic) distribution in superconducting tapes and wires based on the scanning Hall-probe microscopy. It has been demonstrated that this method is very powerful (1) to find a bottleneck which limits global performance of an industrial scale long length tapes in hundreds of meters, (2) to investigate the origin of local inhomogeneity based on a hybrid microscopy correlating local Ic variation and microstructural disorder in multi-scale analysis covering 7 decades of length scale from hundreds of meters down to tens of micro-meters, (3) to establish the processes for narrow and/or multifilamentary HTS conductors for the reduction of magnetization in magnet applications and of AC losses in power applications. We have also established a physical model to describe in-field current transport properties in HTS tapes based on the statistical analysis of Ic variation in long length tapes.

Free Research Field

超伝導工学、計測工学