Magnetic field generated by shielding current in high Tc superconducting coils for NMR magnets
Magnetic field generated by shielding current in high Tc superconducting coils for NMR magnets
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DOI：
10.1088/0953-2048/21/9/095001
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发表时间：
2008-09-01
影响因子：
3.6
通讯作者：
Akachi, Ken
中科院分区：
文献类型：
--
作者：
Amemiya, Naoyuki;Akachi, Ken
对线圈中的高温超导带材进行了电磁场数值分析，以计算超导带材中屏蔽（磁化）电流产生的磁场。该数值模型采用幂律电场 - 电流密度特性和薄带近似，其中垂直于带材宽面的电流分量被忽略。屏蔽（磁化）电流导致线圈中超导带材中的电流分布不均匀。屏蔽（磁化）电流产生的磁场会降低磁场质量，这对于使用高温超导带材的核磁共振磁体的插入线圈来说可能是一个问题。
Numerical electromagnetic field analyses of high T(c) superconducting tape in coils were carried out to calculate the magnetic field generated by the shielding (magnetization) current in superconducting tape. The numerical model employs the power law electric field-current density characteristic and the thin strip approximation, in which the current component normal to the wide face of the tape is neglected. The shielding (magnetization) currents lead to non-uniform current distributions in the superconducting tape in the coils. The magnetic field generated by the shielding (magnetization) current can deteriorate the field quality and could be a concern in insert coils for NMR magnets using high T(c) superconducting tape.