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Development of a thin high-frequency and high-precision magnetic probe array in Sino-United Spherical Tokamak
Review of Scientific Instruments ( IF 1.6 ) Pub Date : 2021-05-07 , DOI: 10.1063/5.0043631
Zhengbo Cheng 1 , Yi Tan 1 , Zhe Gao 1 , Shouzhi Wang 1 , Binbin Wang 1 , Wenbin Liu 1
Affiliation  

Since the major/minor radius of the Sino-United Spherical Tokamak (SUNIST) is 0.3/0.23 m, respectively, the space left for magnetic diagnostics in the high field side (HFS) is quite limited. At the same time, a good signal-to-noise ratio and a high-frequency response (up to 1 MHz) are required for equilibrium reconstruction (ER) and Alfven eigenmode studies. Such a magnetic probe array must be extremely thin and tightly close to the central column, not exceeding the inner limiter and leaving the aspect ratio of the spherical tokamak unchanged. Therefore, the turn number and the shape of windings should be highly optimized to enable both a high-frequency response and an enough effective area. A 32-channel magnetic probe array fulfilling these requirements on the central column is designed, calibrated, and installed in the SUNIST. The array consists of 16 probes. Each of them consists of two perpendicular windings, which can measure toroidal and poloidal magnetic fields simultaneously. The effective area and frequency response of each probe are calibrated using a Helmholtz coil and an LCR bridge based on an equivalent probe-and-cable circuit model. After that, an expression of the magnetic diagnostic response to the field coil currents is used to calibrate the installation error. With the full coverage of magnetic probes in the poloidal direction, more reliable ER can be obtained, and the features of magnetohydrodynamic activities in the HFS can be studied.

中文翻译:

中联合球型托卡马克薄型高频高精度磁探针阵列的研制

由于中联合球型托卡马克(SUNIST)的主/短半径分别为0.3/0.23 m,因此在高场侧(HFS)为磁诊断留下的空间非常有限。同时,平衡重建 (ER) 和 Alfven 特征模式研究需要良好的信噪比和高频响应(高达 1 MHz)。这样的磁探针阵列必须非常薄并且紧靠中心柱,不能超过内部限制器并且保持球形托卡马克的纵横比不变。因此,应高度优化匝数和绕组形状,以实现高频响应和足够的有效面积。在 SUNIST 中设计、校准并安装了一个 32 通道磁探头阵列,可满足中心柱上的这些要求。该阵列由 16 个探针组成。它们中的每一个都由两个垂直的绕组组成,可以同时测量环形和极向磁场。每个探头的有效面积和频率响应使用亥姆霍兹线圈和基于等效探头和电缆电路模型的 LCR 电桥进行校准。之后,对励磁线圈电流的磁诊断响应的表达式用于校准安装误差。随着磁探针在极向方向的全覆盖,可以获得更可靠的ER,并且可以研究HFS中磁流体动力学活动的特征。每个探头的有效面积和频率响应使用亥姆霍兹线圈和基于等效探头和电缆电路模型的 LCR 电桥进行校准。之后,对励磁线圈电流的磁诊断响应的表达式用于校准安装误差。随着磁探针在极向方向的全覆盖,可以获得更可靠的ER,并且可以研究HFS中磁流体动力学活动的特征。每个探头的有效面积和频率响应使用亥姆霍兹线圈和基于等效探头和电缆电路模型的 LCR 电桥进行校准。之后,对励磁线圈电流的磁诊断响应的表达式用于校准安装误差。随着磁探针在极向方向的全覆盖,可以获得更可靠的ER,并且可以研究HFS中磁流体动力学活动的特征。
更新日期:2021-05-28
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