Numerical Simulation of Inductive Method for Measuring jC and Detecting Crack in an HTS Film
Numerical Simulation of Inductive Method for Measuring jC and Detecting Crack in an HTS Film
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用于测量 jC 和检测高温超导薄膜裂纹的感应法的数值模拟
DOI：
10.1109/tasc.2014.2361060
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发表时间：
2014
影响因子：
1.8
通讯作者：
A. Kamitani
中科院分区：
文献类型：
--
作者：
T. Takayama;S. Ikuno;A. Kamitani
开发了一个分析多裂纹高温超导(HTS)薄膜屏蔽电流密度的数值程序。利用该程序成功地重现了电感测量临界电流密度的方法，并研究了高温超导薄膜中多裂纹的可探测性。计算结果表明，当线圈接近裂纹时，阈值电流的估计值总是减小的。这一趋势并不取决于裂缝的数量。此外，如果裂纹距离等于或小于线圈的外径，则很难检测到多条裂纹。根据这些结果，必须采用线圈的外径，以避免影响裂纹和边缘。因此，希望使用尽可能小的外径。
A numerical code has been developed for analyzing the shielding current density in a high-temperature superconducting (HTS) film with multiple cracks. By using the code, the inductive method for measuring the critical current density has been successfully reproduced, and the detectability of the multiple cracks in the HTS film has been investigated. The results of computations show that the estimated value of the threshold current always decreases when the coil approaches a crack. This tendency does not depend on the number of cracks. Moreover, if the crack distance is the outer diameter of the coil or less, it is difficult to detect the multiple cracks. From these results, the outer diameter of the coil must be adopted so as not to affect the cracks and the edges. Therefore, it is desirable to use a smaller the outer diameter as possible.