期刊
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
卷 32, 期 6, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2022.3171190
关键词
Superconducting magnets; Magnetization; Magnetic field measurement; Magnetic flux; High-temperature superconductors; Temperature measurement; Magnetic fields; Artificial pinning centers; flux creep; magnetization relaxation; REBCO
资金
- JSPS-KAKENHI [20K15217]
- New Energy and Industrial Technology Development Organization (NEDO)
- Grants-in-Aid for Scientific Research [20K15217] Funding Source: KAKEN
This study evaluated the magnetization relaxation of commercial REBCO tapes from different manufacturers at various temperatures and magnetic fields. It was found that there was negligible change at low temperatures, but the introduction of APC resulted in different changes at medium and high temperatures depending on the manufacturer.
High-temperature superconducting REBCO tapes are expected to be applied to next-generation magnets for their high current density. One of their problems in the magnet application is the magnetic field instability caused by the decay of magnetization due to the shielding current caused by the tape shape. Therefore, it is important to evaluate the magnetization relaxation of REBCO tapes for the magnet design. In this study, we evaluated the magnetization relaxation of commercial REBCO tapes with and without APCs from Fujikura, SuperPower, and SuperOx in a wide temperature and field range. As a result, at low temperatures below 20K, there was negligible change, but at medium and above temperatures, the change due to the introduction of APC was different for each providers. By discussing the temperature dependence based on the flux creep model and the double kink excitation model, we explained why magnetization relaxation occurs, which is necessary for magnet design.
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