Influence of Shielding Currents in Coated Conductors on Field Quality of Iron-Dominated HTS Magnets Estimated by Numerical Analyses
Influence of Shielding Currents in Coated Conductors on Field Quality of Iron-Dominated HTS Magnets Estimated by Numerical Analyses
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DOI：
10.1109/tasc.2023.3251300
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发表时间：
2023
影响因子：
1.8
通讯作者：
Yang Li;Y. Sogabe;N. Amemiya
中科院分区：
文献类型：
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作者：
Yang Li;Y. Sogabe;N. Amemiya
由屏蔽电流（超导体中感应的持续涡流）感应的附加磁场称为屏蔽电流感应场（SCIF）。对于使用带状高温超导（HTS）线的磁体来说，SCIF 是一个严重的问题，因为它会降低磁体产生的磁场的精度和稳定性。在以铁为主的高温超导磁体中，铁磁极之间气隙处的磁场分布主要由磁极形状决定，因此 SCIF 对产生磁场质量的影响通常被认为可以忽略不计。然而，需要对 SCIF 进行定量估计来支持这一假设。因此，我们开发了一种实用的方法来估计铁为主的 HTS 磁体中的 SCIF 分布，并用它来估计铁为主的 HTS 磁体中 SCIF 分布的时间变化。根据分析结果，我们确认SCIF引起的磁场相对误差在10-4的量级，这在许多磁体应用中可以忽略不计。
Additional magnetic fields induced by shielding currents (persistent eddy current induced in superconductor) are called shielding-current induced fields (SCIFs). SCIFs are serious problem in magnets using tape-shaped high-temperature superconductor (HTS) wires, because it would worsen the accuracy and stability of the generated magnetic field of the magnets. In iron-dominated HTS magnets, magnetic field distribution at air gap between iron magnetic poles is dominated by poles’ shape, so the influence of SCIFs on the quality of generated magnetic field is usually considered negligible. However, quantitative estimation of SCIFs is required to support this assumption. Therefore, we developed a practical method to estimate SCIF distributions in iron-dominated HTS magnets and use it to estimate temporal change of SCIF distribution in an iron-dominated HTS magnet. According to the analysis results, we confirmed relative error of magnetic field caused by SCIFs is in the order of 10–4, which is negligible in many magnet applications.