Pulse field magnetization of a ring-shaped bulk superconductor
Pulse field magnetization of a ring-shaped bulk superconductor
复制标题
环形体超导体的脉冲场磁化
DOI：
10.1088/0953-2048/15/5/322
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发表时间：
2002
影响因子：
3.6
通讯作者：
Naoyuki Nozawa
中科院分区：
文献类型：
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作者：
H. Ohsaki;Tatsuya Shimosaki;Naoyuki Nozawa
我们研究了YBCO大块超导环的脉冲场磁化强度。实验中对外径46 mm、内径16 mm、高度15 mm的YBCO环形超导体施加6ms脉冲磁场，液氮(77K)冷却。然后，用霍尔传感器测量了俘获磁场分布。例如，一个1.2T的脉冲场产生了中空的俘获磁场。此外，还用有限元方法求解了热场与电磁场的耦合问题，其中超导体中的E-J(E为电场，J为电流密度)关系采用幂n模型。实验结果与分析结果的比较表明，n=6给出了较好的一致性。我们还讨论了电流密度分布、温度分布等。
We have studied the pulse field magnetization of a YBCO bulk superconducting ring. In the experiments a 6 ms pulse magnetic field was applied to a ring-shaped YBCO superconductor with a 46 mm outer diameter, 16 mm inner diameter and 15 mm height, which was cooled by liquid nitrogen (77 K). Then, trapped magnetic field profiles were measured with a Hall sensor. For example, a single 1.2 T pulse field generated a hollow profile of the trapped magnetic field. In addition, the finite element method was used to solve the coupled problem of thermal and electromagnetic fields, where the power-n model was adopted for the E–J (E is the electric field and J is the current density) relation in the superconductor. A comparison between the results of experiment and analysis has shown that n = 6 gave good agreement between them. We have also discussed the current density distribution, temperature distribution, etc.