Development of Persistent-Current Mode HTS Coil for the RT-1 Plasma Device
Development of Persistent-Current Mode HTS Coil for the RT-1 Plasma Device
复制标题
RT-1 等离子体装置的持续电流模式高温超导线圈的开发
DOI：
10.1109/tasc.2006.873272
复制
发表时间：
2006
影响因子：
1.8
通讯作者：
Z. Yoshida
中科院分区：
文献类型：
--
作者：
T. Tosaka;Y. Ohtani;M. Ono;T. Kuriyama;S. Mizumaki;M. Shibui;K. Nakamoto;N. Tachikawa;J. Morikawa;Y. Ogawa;Z. Yoshida
“RT-1”等离子体约束装置具有高温超导(HTS)浮动磁体，是东京大学为先进的高β等离子体和聚变研究而建造的。高温超导(HTS)悬浮磁体被磁悬浮在等离子体真空室内。等离子体受到高温超导浮动磁体周围磁偶极子磁场的限制。高温超导浮动磁体工作在恒流模式，由高温超导线圈、高温超导恒流开关(PCS)、电流引线可拆卸接头、冷却管可拆卸接头、保温屏和真空室组成。高温超导线圈、PCS和隔热罩通过流经冷却管的氦气被冷却到20K以下。漂浮高温超导磁体被设计成在20K到30K的温度范围内工作，当它悬浮时不会被冷却。我们制作了一个由高温超导线圈和PCS组成的恒流高温超导线圈。在将恒流高温超导线圈安装在浮动磁体低温恒温器之前，对其进行了恒流操作和保护试验。电流衰减率在8小时内为0.9%。通过保护试验中的PCS失超，实现了线圈能量的安全放电
The plasma confinement device "RT-1" which had a high temperature superconducting (HTS) floating magnet was constructed for advanced high-beta plasma and fusion research at the University of Tokyo. The high temperature superconducting (HTS) floating magnet is magnetically levitated inside the plasma vacuum vessel. Plasma is confined by a magnetic dipole field around the HTS floating magnet. The HTS floating magnet is operated in persistent-current mode and it consists of an HTS coil, an HTS persistent-current switch (PCS), a pair of demountable joints of current leads, detachable joints of a cooling tube, a thermal shield and a vacuum vessel. The HTS coil and the PCS and the thermal shield are cooled below 20 K by a flow of helium gas through the cooling tube. The floating HTS magnet is designed to operate in the temperature range from 20 K to 30 K without being cooled while it is levitated. We fabricated a persistent-current HTS coil that consists of the HTS coil and the PCS. Persistent-current operations and protection tests were conducted with the persistent-current HTS coil before it was mounted in the floating magnet cryostat. The current-decay rate was 0.9% in an 8 hour operation. The coil energy was safely discharged by inducing PCS quench in a protection test