FIELD-FREE CORE, CURRENT DISTRIBUTION, AND ALTERNATING CURRENT LOSSES IN SELF FIELDS FOR RECTANGULAR SUPERCONDUCTOR TAPES
FIELD-FREE CORE, CURRENT DISTRIBUTION, AND ALTERNATING CURRENT LOSSES IN SELF FIELDS FOR RECTANGULAR SUPERCONDUCTOR TAPES
复制标题
矩形超导带的无场磁芯、电流分布以及自场中的交变电流损耗
DOI：
10.1063/1.121604
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发表时间：
1998
影响因子：
4
通讯作者：
A. Oota
中科院分区：
文献类型：
--
作者：
T. Fukunaga;R. Inada;A. Oota
提出了一种方法，用于计算具有任意截面几何形状的直超导带材的无场芯形状、电流分布以及相应的自场中的交流（ac）损耗，将其作为电流幅值\(I_0\)的参数。通过表明无场芯内部的磁场可忽略不计以及检查椭圆带材的交流损耗计算结果与诺里斯理论的预测相符，证明了该方法的有效性。矩形带材的交流损耗在接近临界电流的高\(I_0\)值时表现得像薄带超导材料，而随着\(I_0\)降低，会逐渐偏离这种行为。矩形带材宽度与厚度的纵横比减小会使这种偏离更加显著。
A method is proposed to calculate the shape of field-free core, the current distribution, and accordingly the alternating current (ac) losses in self fields as a parameter of current amplitude I0 for straight superconductor tapes with the arbitrary sectional geometry. The validity for this is justified by showing that magnetic fields inside the field-free core are negligibly small and by checking that calculation results of ac losses for elliptic tapes agree with the prediction by the theory of Norris. The ac losses for rectangular tapes behave as a thin strip superconductor in high I0 values near critical current, while showing a gradual deviation from this behavior as I0 is lowered. A decrease in the aspect ratio of width to thickness in the rectangular tape makes the deviation more remarkable.