Measurement and Analysis on Local Magnetization Properties of RE-123 Coated Conductor With DC Transport Current and External Magnetic Field
Measurement and Analysis on Local Magnetization Properties of RE-123 Coated Conductor With DC Transport Current and External Magnetic Field
复制标题
直流传输电流和外磁场作用下RE-123涂层导体局部磁化特性的测量与分析
DOI：
10.1109/tasc.2020.2974859
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发表时间：
2020
影响因子：
1.8
通讯作者：
Takanobu Kiss
中科院分区：
文献类型：
--
作者：
Kohei Higashikawa;Naohiro Numata;Kohei Hisajima;Takumi Suzuki;Takanobu Kiss
RE-123涂层导体的磁化强度影响着核磁共振、核磁共振和加速器用磁体的空间均匀性和时间变化，这是一个重要的问题。因此，对涂覆导体的磁化过程的理解和建模对于定量估计和补偿其对磁体的影响是至关重要的。另一方面，涂层导体的磁化强度通常是作为全局值进行测量和分析的，因此很难阐明支配这种全局性能的局部电磁行为。此外，这种行为不仅需要在外加磁场的情况下进行研究，而且还需要在磁体中暴露的直流传输电流的情况下进行研究。在本研究中，使用基于扫描霍尔探针显微镜(SHPM)的空间分辨测量来表征涂层导体的磁化强度。通过可视化的磁化电流分布及其时间变化，阐明了磁化强度的大小和时间变化。特别是考虑了输运电流的影响，成功地对它们进行了模拟。在此基础上，采用基于有限元方法的数值分析方法，对实验结果进行了重构。这将有助于定量估计和补偿含有RE-123涂层导体的磁体的磁化问题。
It has been recognized as a significant issue that the magnetization of RE-123 coated conductors affects the spatial homogeneity and the time variation of the magnetic field of the magnets for MRI, NMR, and accelerators. Therefore, the understanding and the modelling of the magnetization of a coated conductor are crucial for the quantitative estimation and the compensation of its influence on a magnet. On the other hand, the magnetization of the coated conductor has been usually measured and analyzed as a global value; then it is difficult to clarify the local electromagnetic behavior governing such a global performance. Furthermore, such behavior should be investigated under the condition not only with external magnetic field but also with DC transport current as is exposed in a magnet. In this study, the magnetization of a coated conductor was characterized by a spatially-resolved measurement based on the scanning Hall-probe microscopy (SHPM). The magnitude and the time variation of the magnetization were clarified from the visualized magnetization current distribution and its time variation. In particular, they were modeled successfully including the influence of the transport current. Furthermore, taking account of the findings, the experimental results were successfully reconstructed by a numerical analysis based on finite element method (FEM). This will contribute to the quantitative estimation and the compensation of the magnetization problem for the magnets comprising RE-123 coated conductors.