A simple screening current-induced magnetic field estimation method for REBCO pancake coils
A simple screening current-induced magnetic field estimation method for REBCO pancake coils
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DOI：
10.1088/1361-6668/aafe26
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发表时间：
2019-03
影响因子：
3.6
通讯作者：
S. Noguchi;H. Ueda;S. Hahn;A. Ishiyama;Y. Iwasa
中科院分区：
文献类型：
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作者：
S. Noguchi;H. Ueda;S. Hahn;A. Ishiyama;Y. Iwasa
核磁共振/核磁共振REBa2Cu3Oy （REBCO, RE =稀土）磁体的开发正在世界各地进行。研究发现，用REBCO带缠绕的核磁共振/核磁共振磁体的电流感应磁场（scmf）筛选是一个严重的问题。在REBCO磁体的设计阶段，迫切需要减少SCMFs，并且也需要对SCMFs进行估计。为了对单轴流场进行评价，目前还需要有限元法或边界积分法，并需要高水平的仿真技术。在本文中，我们开发了一种简单的方法来估计SCMF，而不需要高级模拟技术。该方法首先计算绕组匝的电感，然后根据穿透绕组匝的磁场估计屏蔽电流。SCMF由估计的筛选电流获得。用该方法计算出的细观细观结构与有限元的实测和仿真结果进行了比较。结果很一致，但我们可以看到很大的差异。然而，通过提出的方法发现的scmf足够准确，无需使用高级模拟技术即可知道它们处于设计阶段。
The development of NMR/MRI REBa2Cu3Oy (REBCO, RE = rare earth) magnets is happening all over the world. It has been found that screening current-induced magnetic fields (SCMFs) are a serious problem for NMR/MRI magnets wound with REBCO tapes. The reduction of SCMFs is strongly desired, and the estimation of SCMFs is also desired at the design stage of REBCO magnets. In order to evaluate a SCMF, a finite element method (FEM) or a boundary integration method is needed thus far, and a high-level simulation technique is required. In this paper, we develop an easy method to estimate a SCMF without a high-level simulation technique. In this method, the inductance of a winding turn is calculated and then a screening current is estimated according to the magnetic field penetrating into the winding turn. The SCMF is obtained from the estimated screening current. The SCMFs computed by the proposed method were compared with measurements and simulation results of the FEM. The results agreed well, but we can see a large difference. However, the SCMFs found by the proposed method are accurate enough to know they are at the design stage without the use of a high-level simulation technique.