Measurement and Simulation of Magnetic Field Generated by Screening Currents in HTS Coil
Measurement and Simulation of Magnetic Field Generated by Screening Currents in HTS Coil
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DOI：
10.1109/tasc.2014.2299537
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发表时间：
2014-01
影响因子：
1.8
通讯作者：
H. Ueda;M. Fukuda;K. Hatanaka;Kenta Michitsuji;H. Karino;Tao Wang;Xudong Wang;A. Ishiyama;S. Noguchi;Y. Yanagisawa;H. Maeda
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文献类型：
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作者：
H. Ueda;M. Fukuda;K. Hatanaka;Kenta Michitsuji;H. Karino;Tao Wang;Xudong Wang;A. Ishiyama;S. Noguchi;Y. Yanagisawa;H. Maeda
在用高温超导 (HTS) 磁带缠绕的线圈中，磁场的径向分量会在磁带中感应出大的屏蔽电流。此外，当在磁场下向HTS带提供传输电流时，总电流（由传输电流和屏蔽电流组成）流动不均匀。屏蔽电流产生的磁场影响回旋加速器应用中的磁场分布。因此，有必要研究屏蔽电流对高温超导线圈中磁场的减少、磁滞和漂移的影响。在我们之前的研究中，我们开发了一种新颖的三维电磁场模拟代码，旨在阐明这些影响。在本研究中，我们测量了小型高温超导扁平线圈模型的屏蔽电流产生的磁场的减少和磁滞。此外，我们使用我们开发的考虑非线性电压电流特性的仿真代码，对高温超导线圈中的屏蔽电流对磁场的空间和时间行为的影响进行了数值研究。
In coils wound with high-temperature superconducting (HTS) tapes, large screening currents are induced in the tape by the radial component of the magnetic field. Furthermore, when a transport current is supplied to the HTS tape under a magnetic field, the total current (which consists of the transport and screening currents) flows inhomogeneously. The magnetic field generated by the screening currents affects the magnetic field distribution in cyclotron applications. Investigating the effects of the screening currents on the reduction, hysteresis, and drift of the magnetic field in the HTS coil is therefore necessary. In our previous studies, we have developed a novel simulation code for a three-dimensional electromagnetic field with the aim of clarifying these effects. In the present study, we measured the reduction and hysteresis of the magnetic field generated by the screening currents for a small model of HTS pancake coil. Additionally, we numerically investigated the influence of the screening current in the HTS coil on the spatial and temporal behavior of the magnetic field using our developed simulation code, which considers the nonlinear voltage-current characteristics.