Magnetic diagnostics for magnetohydrodynamic instability research and the detection of locked modes in J-TEXT

Dongliang HAN (韩东良); Chengshuo SHEN (沈呈硕); Nengchao WANG (王能超); Da LI (李达); Feiyue MAO (毛飞越); Zhengkang REN (任正康); Yonghua DING (丁永华); the J-TEXT Team

doi:10.1088/2058-6272/abeeda

Plasma Science and Technology > 2021 > 23(5): 55104-055104. > DOI: 10.1088/2058-6272/abeeda

Dongliang HAN (韩东良), Chengshuo SHEN (沈呈硕), Nengchao WANG (王能超), Da LI (李达), Feiyue MAO (毛飞越), Zhengkang REN (任正康), Yonghua DING (丁永华), the J-TEXT Team. Magnetic diagnostics for magnetohydrodynamic instability research and the detection of locked modes in J-TEXT[J]. Plasma Science and Technology, 2021, 23(5): 55104-055104. DOI: 10.1088/2058-6272/abeeda

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Magnetic diagnostics for magnetohydrodynamic instability research and the detection of locked modes in J-TEXT

International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China

Funds: This work was supported by the National MCF Energy R&D Program of China (No. 2018YFE0309100), National Natural Science Foundation of China (NSFC) (No. 11905078) and 'the Fundamental Research Funds for the Central Universities' (No. 2020kfyXJJS003).

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Received Date: December 18, 2020
Revised Date: March 13, 2021
Accepted Date: March 14, 2021

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Abstract

Abstract

Magnetohydrodynamic (MHD) instabilities are widely observed during tokamak plasma operation. Magnetic diagnostics provide important information which supports the understanding and control of MHD instabilities. This paper presents the current status of the magnetic diagnostics dedicated to measuring MHD instabilities at the J-TEXT tokamak; the diagnostics consist of five Mirnov probe arrays for measuring high-frequency magnetic perturbations and two saddle-loop arrays for low-frequency magnetic perturbations, such as the locked mode. In recent years, several changes have been made to these arrays. The structure of the probes in the poloidal Mirnov arrays has been optimized to improve their mechanical strength, and the number of in-vessel saddle loops has also been improved to support better spatial resolution. Due to the installation of high-field-side (HFS) divertor targets in early 2019, some of the probes were removed, but an HFS Mirnov array was designed and installed behind the targets. Owing to its excellent toroidal symmetry, the HFS Mirnov array has, for the first time at J-TEXT, provided valuable new information about the locked mode and the quasi-static mode (QSM) in the HFS. Besides, various groups of magnetic diagnostics at different poloidal locations have been systematically used to measure the QSM, which confirmed the poloidal mode number m and the helical structure of the QSM. By including the HFS information, the 2/1 resonant magnetic perturbation (RMP)-induced locked mode was measured to have a poloidal mode number m of ~2.
- J-TEXT tokamak,
- locked mode,
- magnetic diagnostics,
- magnetohydrodynamicinstabilities

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Magnetic diagnostics for magnetohydrodynamic instability research and the detection of locked modes in J-TEXT