Operando measurement and modeling of current transport properties for high-temperature superconducting tapes with a wide-range of electric-field window

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K20430
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0302:Electrical and electronic engineering and related fields
• Research Institution: Kyushu University
• Principal Investigator: Wu Zeyu 九州大学, システム情報科学研究院, 助教 (40962147)
• Project Period (FY): 2022-08-31 – 2024-03-31
• Keywords: 電流輸送特性 / 磁気顕微法 / 超低電界領域

Outline of Final Research Achievements

High-temperature superconducting tapes are potential for AC and DC applications, which correspond to a wide-range of electric-field window from 10-2 ~ 10-11 V/m. In this study, we developed the method of operando measurement and modeling for current transport properties with a wide-range window of electric-field.
We carried out integrated measurements, including current-voltage transport measurements by four-probe method, and dynamics of magnetic field by time-resolved magnetic microscopy. We finally succeeded in obtaining electric-field versus current-density characteristics with continuous electric-field window from 10-2 ~ 10-11 V/m.Besides, the measurement results could also be described by a numerical model considering the statical behaviours of magnetic flux very well. These achievements support that this research has succeeded in building fundamental technique to clarify current transport properties with a wide-range window of electric-field.

Free Research Field

計測工学

Academic Significance and Societal Importance of the Research Achievements

MRIやNMRの高磁界直流マグネットや核融合炉用大型マグネット、さらに交流モーター用巻線など、直流から交流に至る複雑な実用環境におかれる際に、高温超伝導線材の電磁現象を理解するのに広い電界領域に亘る電流輸送特性の解明が不可欠となる。本研究によって、10-2 ~ 10-11 V/m電界領域における電流輸送特性の実測およびそのモデリングにかかる手法を開発した。また、特定な応用環境に対応した材料開発のためにも基盤技術という位置づけとして重要な貢献が期待できる。