Overview of runaway current suppression and dissipation on J-TEXT tokamak

Zhongyong CHEN; Zhifang LIN; Wei YAN; Duwei HUANG; Yunong WEI; You LI; Nianheng CAI; Jie HU; Yonghua DING; Yunfeng LIANG; Zhonghe JIANG; J-TEXT Team

doi:10.1088/2058-6272/aca272

Plasma Science and Technology > 2022 > 24(12): 124009. > DOI: 10.1088/2058-6272/aca272

Zhongyong CHEN, Zhifang LIN, Wei YAN, Duwei HUANG, Yunong WEI, You LI, Nianheng CAI, Jie HU, Yonghua DING, Yunfeng LIANG, Zhonghe JIANG, J-TEXT Team. Overview of runaway current suppression and dissipation on J-TEXT tokamak[J]. Plasma Science and Technology, 2022, 24(12): 124009. DOI: 10.1088/2058-6272/aca272

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Overview of runaway current suppression and dissipation on J-TEXT tokamak

1.
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
2.
School of Electrical Engineering & Automation, Jiangsu Normal University, Xuzhou 221116, People's Republic of China

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Corresponding author:
Zhifang LIN, E-mail: zflin@jsnu.edu.cn

Wei YAN, E-mail: yanwei1090@hust.edu.cn
³See Nengchao Wang et al 2022 (https://doi.org/10.1088/1741-4326/ac3aff) for the J-TEXT tokamak.
Received Date: August 28, 2022
Revised Date: November 09, 2022
Accepted Date: November 13, 2022
Available Online: December 05, 2023
Published Date: December 21, 2022

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Abstract

Abstract

The main works on disruption mitigation including suppression and mitigation of runaway current on the J-TEXT tokamak are summarized in this paper. Two strategies for the mitigation of runaway electron (RE) beams are applied in experiments. The first strategy enables the REs to be completely suppressed by means of supersonic molecular beam injection and resonant magnetic perturbation which can enhance RE loss, magnetic energy transfer which can reduce the electric field, and secondary massive gas injection (MGI) which can increase the collisional damping. For the second strategy, the runaway current is allowed to form but should be dissipated or soft landed within tolerance. It is observed that the runaway current can be significantly dissipated by MGI, and the dissipation rate increases with the injected impurity particle number and eventually stabilizes at 28 MA s⁻¹. The dissipation rate of the runaway current can be up to 3 MA s⁻¹ by ohmic field. Shattered pellet injection has been chosen as the main disruption mitigation method, which has the capability of injecting material deeper into the plasma for higher density assimilation when compared to MGI. Moreover, simulation works show that the RE seeds in the plasma are strongly influenced under different phases and sizes of 2/1 mode locked islands during thermal quench. The robust runaway suppression and runaway current dissipation provide an important insight on the disruption mitigation for future large tokamaks.
- tokamak,
- disruption mitigation,
- runaway electron,
- runaway current

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Acknowledgments

This work is supported by the National MCF Energy R & D Program of China (Nos. 2019YFE03010004, 2018YFE0309103, 2018YFE0310300, 2018YFE0309100, 2017YFE0302000, 2017YFE0300501), National Natural Science Foundation of China (Nos. 11775089, 51821005, 12205122, 11905077 and 11575068), and the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No. 21KJB140025).

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Overview of runaway current suppression and dissipation on J-TEXT tokamak

Abstract