Tu Cui, Liu Adi, Li Zichao, Tan Mingsheng, Luo Bing, You Wei, Li Chenguang, Bai Wei, Fu Chenshuo, Huang Fangcheng, Xiao Bingjia, Shen Biao, Shi Tonghui, Chen Dalong, Mao Wenzhe, Li Hong, Xie Jinglin, Lan Tao, Ding Weixing, Xiao Chijin, Liu Wandong
KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
Rev Sci Instrum. 2017 Sep;88(9):093513. doi: 10.1063/1.5003039.
A system for electromagnetic measurements was designed and installed on the Keda Torus eXperiment (KTX) reversed field pinch device last year. Although the unique double-C structure of the KTX, which allows the machine to be opened easily without disassembling the poloidal field windings, makes the convenient replacement and modification of the internal inductive coils possible, it can present difficulties in the design of flux coils and magnetic probes at the two vertical gaps. Moreover, the KTX has a composite shell consisting of a 6 mm stainless steel vacuum chamber and a 1.5 mm copper shell, which results in limited space for the installation of saddle sensors. Therefore, the double-C structure and composite shell should be considered, especially during the design and installation of the electromagnetic diagnostic system (EDS). The inner surface of the vacuum vessel includes two types of probes. One type is for the measurement of the global plasma parameters, and the other type is for studying the local behavior of the plasma and operating the new saddle coils. In addition, the probes on the outer surface of the composite shell are used for measurements of eddy currents. Finally, saddle sensors for radial field measurements for feedback control were installed between the conducting shell and the vacuum vessel. The entire system includes approximately 1100 magnetic probes, 14 flux coils, 4×26×2 saddle sensors, and 16 Rogowski coils. Considering the large number of probes and limited space available in the vacuum vessel, the miniaturization of the probes and optimization of the probe distribution are necessary. In addition, accurate calibration and careful mounting of the probes are also required. The frequency response of the designed magnetic probes is up to 200 kHz, and the resolution is 1 G. The EDS, being spherical and of high precision, is one of the most basic and effective diagnostic tools of the KTX and meets the demands imposed by requirements on basic machine operating information and future studies.
去年，一套用于电磁测量的系统被设计并安装在了科大一环流器实验（KTX）反场箍缩装置上。尽管KTX独特的双C结构使得机器无需拆卸极向场绕组就能轻松打开，从而便于内部感应线圈的更换和改装，但这也给两个垂直间隙处的磁通线圈和磁探针的设计带来了困难。此外，KTX有一个由6毫米不锈钢真空室和1.5毫米铜壳组成的复合外壳，这导致安装鞍形传感器的空间有限。因此，在设计和安装电磁诊断系统（EDS）时，应考虑双C结构和复合外壳，尤其是在这一过程中。真空容器的内表面有两种类型的探针。一种用于测量全局等离子体参数，另一种用于研究等离子体的局部行为以及操作新的鞍形线圈。此外，复合外壳外表面的探针用于测量涡电流。最后，用于径向场测量以进行反馈控制的鞍形传感器被安装在导电壳和真空容器之间。整个系统包括大约1100个磁探针、14个磁通线圈、4×26×2个鞍形传感器和16个罗戈夫斯基线圈。考虑到真空容器内探针数量众多且空间有限，有必要使探针小型化并优化探针分布。此外，还需要对探针进行精确校准和仔细安装。所设计的磁探针的频率响应高达200 kHz，分辨率为1 G。该电磁诊断系统呈球形且精度高，是KTX最基本、最有效的诊断工具之一，满足了对基本机器运行信息及未来研究的要求。
