Strong Localization of the Density of Power Losses in Type-II Superconducting Wires
Strong Localization of the Density of Power Losses in Type-II Superconducting Wires
复制标题
II 型超导线中功率损耗密度的强局域化
DOI：
10.1109/tasc.2012.2232695
复制
发表时间：
2013
影响因子：
1.8
通讯作者：
S. V. Yampolskii
中科院分区：
文献类型：
--
作者：
H. S. Ruiz;A. Badía;Y. Genenko;S. V. Yampolskii
本文以一根圆形直超导导线为数值原型，对交流输运电流和振荡横向磁场同时作用下电流的局部分布和功率损耗密度进行了全面的研究。在临界态理论的准稳态方法下，对未磁化线和预磁化线进行了数值模拟。揭示了表征导线截面上电磁量的局部动力学的各种各样的通量前沿形状。在特殊条件下，以所谓的“类场”或“类流”形状为特征的通量锋被显示出来，在临界值Ic和-Ic之间出现了由细线分隔的多个电流域。尽管缺乏对称性，无法至少直观地定义磁通锋的形状，但已经确定了磁通密度分布的普遍模式。此外，只要使用同步电磁激励，就可以设想功率损耗密度的强不对称局部化。
A round straight superconducting wire has been used as numerical prototype for pursuing a comprehensive study on the local distribution of current and the density of power losses, attained by the simultaneous action of an ac transport current and an oscillating transverse magnetic field. The numerical simulations have been performed within the quasi-steady approach of the critical state theory, including virgin and premagnetized wires. A wide variety of shapes for the flux fronts characterizing the local dynamics of the electromagnetic quantities across the section of the wire has been revealed. Under special conditions, flux fronts characterized either by the so-called “field-like”, or “current-like ” shapes are shown, with the occurrence of multiple domains of current flow detached by thin lines acting as boundaries between the critical values Ic and -Ic. Despite the lack of symmetry for attaining at least an intuitive definition of the shape of the flux front, a universal pattern of the distribution of magnetic flux density has been identified. Also, a strong asymmetric localization of the density of power losses has been envisaged, as long as synchronous electromagnetic excitations are used.