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Special Issue:
SPECIAL TOPIC — Plasma disruption
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| SPECIAL TOPIC—Plasma disruption |
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Effect of the relative phase between pre-existing 2/1 and 3/1 magnetic islands on the suppression of runaway electrons on J-TEXT |
| Jin-Yu Xiong(熊金玉)1,2, Zhong-He Jiang(江中和)1,†, Zi-Xiao Jiao(焦子啸)1, Zhen Li(李振)1, Yun-Feng Liang(梁云峰)1,3,4, Zhong-Yong Chen(陈忠勇)1, Yong-Hua Ding(丁永华)1, and J-TEXT Team1 |
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, China;
2 Yangtze Memory Technologies Co., Ltd., Wuhan 430074, China;
3 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;
4 Forschungszentrum Jülich GmbH, Institut für Energie-und Klimaforschung-Plasmaphysik, Jülich 52425, Germany |
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Abstract In the experiments of actively triggering plasma disruption by massive gas injection, the externally applied resonant magnetic perturbation has been used to mitigate the hazard of runaway electron (RE). Motivated by the experiment of multimode coupling to suppress REs on J-TEXT, some typical simulation cases with non-ideal MHD with rotation-open discussion (NIMROD) code are carried out to explore the influential mechanism of different relative phases between m/n = 2/1 and m/n = 3/1 magnetic islands on the confinement of REs. Results show that the RE confinement is drastically affected by the relative phase between 2/1 and 3/1 magnetic islands. When the O point phase of 2/1 and 3/1 magnetic islands is toroidal 330°, REs can be effectively lost. The fitting curve of the remaining ratio of REs vs. the relative toroidal phase is predicted to approximate a sine-like function dependence. Further studies indicate that the phase difference between coexisting 2/1 and 3/1 islands can affect the radial transport of impurities. The loss of runaway electrons is closely related to the deposition effect of impurity. The impurity is easier to spread into the core region with smaller poloidal phase difference between the radial velocity of impurity and the impurity quantity of Ar.
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Received: 29 December 2022
Revised: 27 February 2023
Accepted manuscript online: 14 March 2023
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PACS:
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52.65.Kj
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(Magnetohydrodynamic and fluid equation)
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52.25.Fi
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(Transport properties)
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52.25.Vy
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(Impurities in plasmas)
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47.65.-d
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(Magnetohydrodynamics and electrohydrodynamics)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12175078 and 51821005). The authors are very grateful for the assistance of the NIMROD team. |
Corresponding Authors:
Zhong-He Jiang
E-mail: zhhjiang@hust.edu.cn
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Cite this article:
Jin-Yu Xiong(熊金玉), Zhong-He Jiang(江中和), Zi-Xiao Jiao(焦子啸), Zhen Li(李振),Yun-Feng Liang(梁云峰), Zhong-Yong Chen(陈忠勇), Yong-Hua Ding(丁永华), and J-TEXT Team Effect of the relative phase between pre-existing 2/1 and 3/1 magnetic islands on the suppression of runaway electrons on J-TEXT 2023 Chin. Phys. B 32 075210
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