Angular Dependence of Transport AC Losses in Superconducting Wire with Position-Dependent Critical Current Density in a DC Magnetic Field
Angular Dependence of Transport AC Losses in Superconducting Wire with Position-Dependent Critical Current Density in a DC Magnetic Field
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DOI：
10.1007/s10909-013-0856-z
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发表时间：
2013-01
影响因子：
2
通讯作者：
X. Su;L. Xiong;Yuanwen Gao;Youhe Zhou
中科院分区：
文献类型：
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作者：
X. Su;L. Xiong;Yuanwen Gao;Youhe Zhou
在典型的应用环境中，高温超导体通常在外加磁场下携带交流输运电流，输运交流损耗在高温超导体中起着非常重要的作用。在本文中，我们提出了在高温超导导线传输交流损耗的解析公式，考虑了临界电流密度的非均匀和各向异性场依赖。用有效质量理论描述了临界电流密度的角度依赖性，高温超导线材的临界电流密度截面分布不均匀。我们计算了在不同的直流外加磁场下的归一化交流损耗的角度依赖性。该公式的计算结果与实验数据吻合较好，且优于Norris公式的计算结果。该解析公式可以解释实验传输电流损耗与Norris公式的偏差，并适用于实际情况下的传输交流损耗计算。
Transport AC losses play a very important role in high temperature superconductors (HTSs), which usually carry AC transport current under applied magnetic field in typical application-like conditions. In this paper, we propose the analytical formula for transport AC losses in HTS wire by considering critical current density of both inhomogeneous and anisotropic field dependent. The angular dependence of critical current density is described by effective mass theory, and the HTS wire has inhomogeneous distribution cross-section of critical current density. We calculate the angular dependence of normalized AC losses under different DC applied magnetic fields. The numerical results of this formula agree well with the experiment data and are better than the results of Norris formula. This analytical formula can explain the deviation of experimental transport current losses from the Norris formula and apply to calculate transport AC losses in realistic practical condition.