A Long Charging Delay for a No-Insulation REBCO Layer-Wound Coil and Its Influence on Operation With Outer LTS Coils
A Long Charging Delay for a No-Insulation REBCO Layer-Wound Coil and Its Influence on Operation With Outer LTS Coils
复制标题
DOI：
10.1109/tasc.2016.2515540
复制
发表时间：
2016-01
影响因子：
1.8
通讯作者：
K. Yanagisawa;S. Iguchi;Yi Xu;Jing Li;A. Saito;H. Nakagome;T. Takao;S. Matsumoto;M. Hamada;Y. Yanagisawa
中科院分区：
文献类型：
--
作者：
K. Yanagisawa;S. Iguchi;Yi Xu;Jing Li;A. Saito;H. Nakagome;T. Takao;S. Matsumoto;M. Hamada;Y. Yanagisawa
本文研究了无绝缘（NI） REBCO层绕（LW）线圈的充电延迟和电磁感应热失控，导致线圈损坏的问题。自感量为1.62 mH的小型NI REBCO LW线圈在4.2 K下的充电延迟时间常数为~3000 s。该线圈安装在低温超导磁体的冷膛内，并对低温超导磁体外线圈进行充电。虽然NI REBCO LW线圈的电路被打开，但线圈内部的感应电流屏蔽了外部线圈产生的磁场。最终，NI REBCO LW线圈在外部线圈充电期间显示出热失控。实验后，我们发现REBCO导体在电极附近有烧断现象，绕组各层导体都有屈曲现象。本文的研究结果指出了NI REBCO LW线圈的技术问题和最坏的情况，这是必须考虑的。
This paper presents a long charging delay for a no-insulation (NI) REBCO layer-wound (LW) coil and an electromagnetic-induced thermal runaway, resulting in damages on the coil. A small NI REBCO LW coil with a self-inductance of 1.62 mH showed a charging delay time constant of ~3000 s at 4.2 K. The coil was installed in the cold bore of a low-temperature superconducting (LTS) magnet, and the LTS outer coil was charged. Although the circuit of the NI REBCO LW coil was opened, the induced current inside the coil screened the magnetic field generated by the outer coils. Eventually, the NI REBCO LW coil showed a thermal runaway during charging the outer coils. After the experiment, we found burnouts of the REBCO conductor near the electrodes and buckling of the conductor for all the layers of the winding. The present results point out the technical problem and the worst case for a NI REBCO LW coil, which must be considered.