Screening effect of plasma flow on the resonant magnetic perturbation penetration in tokamaks based on two-fluid model

Weikang TANG; Qibin LUAN; Hongen SUN; Lai WEI; Shuangshuang LU; Shuai JIANG; Jian XU; Zhengxiong WANG

doi:10.1088/2058-6272/aca372

Plasma Science and Technology > 2023 > 25(4): 045103. > DOI: 10.1088/2058-6272/aca372

Weikang TANG, Qibin LUAN, Hongen SUN, Lai WEI, Shuangshuang LU, Shuai JIANG, Jian XU, Zhengxiong WANG. Screening effect of plasma flow on the resonant magnetic perturbation penetration in tokamaks based on two-fluid model[J]. Plasma Science and Technology, 2023, 25(4): 045103. DOI: 10.1088/2058-6272/aca372

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Screening effect of plasma flow on the resonant magnetic perturbation penetration in tokamaks based on two-fluid model

1.
Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, Peopleʼs Republic of China
2.
Key Laboratory of Geospace Environment, University of Science and Technology of China, Hefei 230026, Peopleʼs Republic of China
3.
Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, Peopleʼs Republic of China

More Information

Corresponding author:
Qibin LUAN, E-mail: luanqb@dlut.edu.cn
Received Date: August 04, 2022
Revised Date: November 14, 2022
Accepted Date: November 15, 2022
Available Online: December 05, 2023
Published Date: February 07, 2023

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Abstract

Abstract

Numerical simulation on the resonant magnetic perturbation penetration is carried out by the newly-updated initial value code MDC (MHD@Dalian Code). Based on a set of two-fluid four-field equations, the bootstrap current, parallel, and perpendicular transport effects are included appropriately. Taking into account the bootstrap current, a mode penetration-like phenomenon is found, which is essentially different from the classical tearing mode model. To reveal the influence of the plasma flow on the mode penetration process, E × B drift flow and diamagnetic drift flow are separately applied to compare their effects. Numerical results show that a sufficiently large diamagnetic drift flow can drive a strong stabilizing effect on the neoclassical tearing mode. Furthermore, an oscillation phenomenon of island width is discovered. By analyzing it in depth, it is found that this oscillation phenomenon is due to the negative feedback regulation of pressure on the magnetic island. This physical mechanism is verified again by key parameter scanning.
- tokamak,
- two-fluid,
- NTM

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Acknowledgments

We acknowledge the Super Computer Center of Dalian University of Technology for providing computer resources. This work is supported by the National Key R & D Program of China (No. 2022YFE03040001), National Natural Science Foundation of China (Nos. 11925501 and 12075048), Chinese Academy of Sciences, Key Laboratory of Geospace Environment, University of Science & Technology of China (No. GE2019-01) and Fundamental Research Funds for the Central Universities (No. DUT21GJ204).

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