Numerical Evaluation of Screening Current-Induced Magnetic Field in No-Insulation REBCO Coil Systems

被引：2
作者：
Ueda S. [1 ]
Ishiyama A. [1 ]
Ueda H. [2 ]
Noguchi S. [3 ]
机构：
[1] Waseda University, Tokyo
[2] Okayama University, Okayama
[3] Hokkaido University, Sapporo Hokkaido
来源：
Ueda, Satomi (atsushi@waseda.jp) | 1600年 / Institute of Electrical and Electronics Engineers Inc.卷 / 31期
基金：
日本学术振兴会;
关键词：
excitation delay; no-insulation coil; REBCO-coated conductor; screening current-induced magnetic field;
D O I：
10.1109/TASC.2021.3064540
中图分类号：
学科分类号：
摘要：
We have been developing a no-insulation (NI) REBCO coil which is expected to be applied to medical accelerators and magnetic resonance imaging as a technology that can achieve both high thermal stability and high current density. Due to the flat shape and much greater, than the thickness, width of a REBCO-coated conductor, the screening currents are remarkably induced by changing the magnetic flux that penetrates the tape vertically. For insulated (INS) coils, this screening current causes an irregular magnetic field (screening current-induced magnetic field (SCIF)). Also, in the NI coil, an excitation delay occurs because of the current flowing in the radial direction with coil excitation. Therefore, as the cause of irregular magnetic field, it is necessary to simultaneously consider the influence of both the excitation delay and SCIF. In this study, we numerically investigate the magnetic field in the NI coil. The SCIF and an excitation delay reduce magnetic accuracy in the NI coil. Thus, we propose an energization waveform that can improve the magnetic field accuracy even if there is an excitation delay. Besides, we verified its effectiveness. © 2002-2011 IEEE.
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