Reduction of Screening Current-Induced Magnetic Field of REBCO Coils by the Use of Multi-Filamentary Tapes
Reduction of Screening Current-Induced Magnetic Field of REBCO Coils by the Use of Multi-Filamentary Tapes
复制标题
DOI：
10.1109/tasc.2014.2377492
复制
发表时间：
2015-06
影响因子：
1.8
通讯作者：
Y. Yanagisawa;Yi Xu;Xinzhe Jin;H. Nakagome;H. Maeda
中科院分区：
文献类型：
--
作者：
Y. Yanagisawa;Yi Xu;Xinzhe Jin;H. Nakagome;H. Maeda
REBCO带状线圈的屏蔽电流感生磁场（屏蔽场）是核磁共振、核磁共振成像和加速器等需要精确磁场的超导线圈系统的关键问题。屏蔽场的大小取决于带中REBCO层的宽度。因此，减小屏蔽场的一个根本方法是使用多层REBCO带材。实验和模拟结果表明，使用的多功能REBCO磁带减少了屏蔽场和效果是显着的中到高负载因数操作，由于完全穿透的磁场和传输电流效应。多芯磁带还减少了线圈充电后磁场的时间漂移。如果采用多芯REBCO带材，其丝宽为0.6~ 0.9mm，则屏蔽场可降低到与Bi-2223线圈相同的水平。
The screening current-induced magnetic field (screening field) for REBCO tape coils is a critical problem for superconducting coil systems which require accurate magnetic fields, such as NMR, MRI and accelerators. The magnitude of the screening field depends on the width of a REBCO layer in a tape. Therefore, a fundamental method to reduce the screening field is to use multi-filamentary REBCO tapes. Experimental and simulated results demonstrate that the use of multi-filamentary REBCO tapes reduced the screening field and the effect is pronounced for medium to high load factor operation, due to full penetration of the magnetic field and the transport current effect. The multi-filamentary tapes also reduce the temporal drift of the magnetic field after the coil charge. If we use multi-filamentary REBCO tapes with a filament width of 0.6~0.9 mm, the screening field is reduced to the same level as Bi-2223 coils.