外界磁场对新型高温超导方形线临界电流的影响

Influence of external magnetic field on the critical current of a novel HTS square wire

第二代高温超导带材临界电流在外界磁场的作用下会发生衰减,衰减程度受磁场大小与角度的影响。为实现高温超导带材的细丝化,提出了一种1mm宽新型高温超导方形线。在77K温度条件下,分别测量了宽度为4mm和1mm的超导带材以及新型高温超导方形线在不同幅值(0~1. 2T)和不同角度(0~360°)磁场下的临界电流。结果表明,高温超导方形线临界电流随外界磁场强度增加而衰减,并有明显的各向异性。此外,通过实验获得了高温超导方形线临界电流对磁场角度的依赖特性数据。

The critical current of 2G high temperature superconducting （HTS） wire is attenuated by the influence of external magnetic field. And the degree of attenuation is decided by the direction and magnitude of the magnetic field. In order to narrow the high temperature superconducting strip, a novel HTS square wire with 1 mm width was suggested. In this paper, the critical currents of HTS tapes with 4mm, 1 mm width and the novel HTS square wire were measured under the temperature of 77K, different magnitude and direction （0-1.2T, 0-360°） of magnetic field, respectively. The results show that the critical current of the novel HTS square wire attenuates with the increase of external magnetic field strength and has obvious anisotropy. The dependence of critical current of the novel HTS square wire on magnetic field angle is obtained.