Magnetic Relaxation in Commercial REBCO Tapes With and Without Artificial Pinning Centers
Magnetic Relaxation in Commercial REBCO Tapes With and Without Artificial Pinning Centers
复制标题
带或不带人工钉扎中心的商业 REBCO 磁带的磁弛豫
DOI：
10.1109/tasc.2022.3171190
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发表时间：
2022
影响因子：
1.8
通讯作者：
Yoshida Y.
中科院分区：
文献类型：
--
作者：
Tsuchiya Y.;Funaki S.;Ozaki T.;Kiuchi M.;Yoshida Y.
高温超导REBCO带材具有较高的电流密度，有望应用于下一代磁体。它们在磁体应用中的问题之一是由于磁带形状引起的屏蔽电流引起的磁化衰减引起的磁场不稳定。因此，评估REBCO磁体的磁化驰豫对磁体设计具有重要意义。在这项研究中，我们评估了商业REBCO磁带在宽的温度和磁场范围内使用和不使用来自Fujikura、SuperPower和SuperOx的APC的磁化驰豫。因此，在低于20K的低温下，变化可以忽略不计，但在中等和以上的温度下，由于引入APC而造成的变化对每个供应商来说是不同的。通过讨论基于磁通蠕变模型和双扭结激励模型的温度依赖性，我们解释了磁化驰豫发生的原因，这是磁体设计所必需的。
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.