Magnetic Microscopy for Nondestructive Characterization of Local Critical Current Distribution in MgB2 Wires With Magnetic Sheath Materials
Magnetic Microscopy for Nondestructive Characterization of Local Critical Current Distribution in MgB2 Wires With Magnetic Sheath Materials
复制标题
磁显微镜无损表征带有磁护套材料的 MgB2 线的局部临界电流分布
DOI：
10.1109/tasc.2016.2516902
复制
发表时间：
2016
影响因子：
1.8
通讯作者：
T. Kiss
中科院分区：
文献类型：
--
作者：
K. Higashikawa;H. Tatara;M. Inoue;S. Ye;A. Matsumoto;H. Kumakura;T. Kiss
我们发展了一种基于磁显微镜的无损表征MgB_2丝中临界电流分布的方法。这种方法使我们能够从产热和/或测量系统的限制的角度来评估MgB_2丝的临界电流，即使在它们变得太大而不能用传统的四探针输运方法测量的情况下也是如此。此外，使用SQUID磁强计还可以估计导线中局部临界电流的不均匀性，而传统的磁化方法很难实现。本文通过克服目前高性能镁B_2线材广泛使用的磁性护套材料的影响，成功地发展了一种无损地表征局部临界电流纵向分布的方法。该方法将成为未来全面商业化生产阶段产品无损检测的基础技术。
We have developed a method for the nondestructive characterization of critical current distribution in MgB2 wires based on magnetic microscopy. This method enables us to evaluate critical currents of MgB2 wires, even in the condition where they become too large to be measured by the conventional four-probe transport method from the viewpoint of heat generation and/or the limitation from the measurement system. Furthermore, the inhomogeneity in local critical currents in the wires can be also estimated, while it is difficult for the conventional magnetization method, using a SQUID magnetometer. In this paper, by overcoming the influence of magnetic sheath materials, which are widely used for recent high-performance MgB2 wires, we have succeeded in developing a nondestructive method for the characterization of longitudinal distribution of local critical currents in them. This method will become a fundamental technique for a nondestructive product testing at the stage of full-fledged commercial production in the future.