An Extended Thin Approximation Method to Simulate Screening Current Induced in REBCO Coils
An Extended Thin Approximation Method to Simulate Screening Current Induced in REBCO Coils
复制标题
模拟 REBCO 线圈中感应屏蔽电流的扩展细近似方法
DOI：
10.1109/tmag.2017.2752083
复制
发表时间：
2018
影响因子：
2.1
通讯作者：
Ishiyama Atsushi
中科院分区：
文献类型：
--
作者：
Noguchi So;Hahn Seungyong;Ueda Hiroshi;Kim SeokBeom;Ishiyama Atsushi
用第二代高温超导体缠绕的超导磁体，即，REBa 2Cu 3 O 7-x（REBCO，RE =稀土）带被期望应用于高磁场核磁共振、MRI和加速器。然而，在实际应用中的一个主要问题是由REBCO带材中感应的屏蔽电流引起的不规则磁场。为了研究屏蔽电流感应磁场，提出了几种模拟方法。一种有效的模拟方法采用了有限元方法与薄近似方法。虽然薄近似方法被发展来模拟电磁钢板中的涡流，但它不适用于承载传输电流的REBCO带材。因此，薄近似方法被扩展到模拟屏蔽电流的REBCO磁带考虑携带传输电流。为了证明所提出的扩展薄近似方法的有效性，REBCO磁体的屏蔽电流的计算，并与传统的薄近似方法的测量和仿真结果进行了比较。利用所提出的方法可以得到更精确的解。
Superconducting magnets wound with second-generation high-temperature superconductors, i.e., REBa2Cu3O7-x(REBCO, RE = Rare Earth) tapes, are desired to apply high magnetic field nuclear magnetic resonance, MRI, and accelerators. However, a major problem for practical application is an undesirable irregular magnetic field caused by screening currents induced in REBCO tapes. To investigate the screening current-induced magnetic field, a few simulation methods have been proposed. One of the effective simulation methods employs a finite-element method with a thin approximation method. Although the thin approximation method was developed to simulate eddy currents in magnetic steel sheets, and it is not applicable to REBCO tapes carrying a transport current. Therefore, the thin approximation method is extended to simulate screening currents in REBCO tapes considering a carrying transport current. To show the validity of the proposed extended thin approximation method, the screening currents of an REBCO magnet are computed, and the results are compared with the measurement and simulation results of the conventional thin approximation method. The more accurate solution is available by using the proposed methods.