Fiber-optic current sensor for plasma current on experimental advanced superconducting tokamak
Fiber-optic current sensor for plasma current on experimental advanced superconducting tokamak
复制标题
实验性先进超导托卡马克等离子体电流光纤电流传感器
DOI：
10.1016/j.fusengdes.2019.01.070
复制
发表时间：
2019-03-01
影响因子：
1.7
通讯作者：
Xiao, B. J.
中科院分区：
文献类型：
--
作者：
Xue, M. M.;Shen, B.;Xiao, B. J.
等离子体电流是托卡马克运行的重要参数。基于法拉第效应的光纤电流传感器是测量稳态放电等离子体电流的最佳选择之一。这种光纤电流传感器（FOCS）已成功地安装在实验先进超导托卡马克（EAST）上。FOCS是基于偏振旋转反射干涉仪的闭环FOCS。传感光纤安装在EAST真空室内部，而信号处理系统保持在真空室外部。为了将光纤引出EAST真空室，研制并组装了一种保偏光纤舱壁连接器。当托卡马克装置运行时，磁场的变化会引起振动甚至冲击。测试了振动和冲击对光纤电流传感器的影响。在EAST实验中，FOCS实现了高达800 kA的等离子体电流测量。此外，FOCS对等离子体破裂期间电流的快速变化有响应。从不同范围的等离子体电流发射的结果来看，光纤电流传感器对EAST的等离子体电流有很好的检测效果。
The plasma current is an essential parameter for tokamak operation. Fiber optic current sensors, based on the Faraday Effect, are one of the best choices to measure the plasma current in a steady-state discharge. Such an fiber-optic current sensor (FOCS) was successfully installed on the Experimental Advanced Superconducting Tokamak (EAST). The FOCS is a closed-loop FOCS, based on a polarization-rotated reflection interferometer. The sensing optical fiber is installed inside the EAST vacuum vessel while the signal processing system is kept outside the vacuum vessel. In order to guide the optical fiber out of EAST vacuum vessel, we have developed and assembled a polarization maintaining optical fiber bulkhead connector. When the tokamak device is operating, the variations in the magnetic field will give rise to vibrations and even shocks. We have tested the influence of vibrations and shocks on fiber-optic current sensor. In EAST experiment, the FOCS has achieved the plasma current measurement up to 800 kA. Furthermore, the FOCS has responds to the rapid change in current during the plasma disruption. From the results from a different range of plasma current shots, the fiber-optic current sensor performed very well to sense the plasma current of the EAST.