Effect of toroidal mode coupling on explosive dynamics of <i>m</i>/<i>n</i> = 3/1 double tearing mode

Xingqiang LU; Ge GAO; Zhiwei MA; Wei GUO; Xin LI

doi:10.1088/2058-6272/ad48cf

Plasma Science and Technology > 2024 > 26(10): 104001. > DOI: 10.1088/2058-6272/ad48cf

Xingqiang LU, Ge GAO, Zhiwei MA, Wei GUO, Xin LI. Effect of toroidal mode coupling on explosive dynamics of m/n = 3/1 double tearing mode[J]. Plasma Science and Technology, 2024, 26(10): 104001. DOI: 10.1088/2058-6272/ad48cf

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Effect of toroidal mode coupling on explosive dynamics of m/n = 3/1 double tearing mode

1.
College of Nuclear Equipment and Nuclear Engineering, Yantai University, Yantai 264005, People’s Republic of China
2.
Institute for Fusion Theory and Simulation, Department of Physics, Zhejiang University, Hangzhou 310027, People’s Republic of China

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Author Bio:
Zhiwei MA: zwma@zju.edu.cn

Wei GUO: guowei@ytu.edu.cn
Corresponding author:
Zhiwei MA, zwma@zju.edu.cn

Wei GUO, guowei@ytu.edu.cn
Received Date: February 19, 2024
Revised Date: April 18, 2024
Accepted Date: May 07, 2024
Available Online: May 08, 2024
Published Date: September 15, 2024

Graphical Abstract

Abstract

Abstract

The CLT code was used to quantitatively study the impact of toroidal mode coupling on the explosive dynamics of the m/n = 3/1 double tearing mode. The focus of this study was on explosive reconnection processes, in which the energy bursts and the main mode no longer dominates when the separation between two rational surfaces is relatively large in the medium range. The development of higher m and n modes is facilitated by a relatively large separation between two rational surfaces, a small q_min (the minimum value of the safety factor), or low resistivity. The relationships between the higher m and n mode development, explosive reconnection rate, and position exchange of 3/1 islands are summarized for the first time. Separation plays a more important role than q_min in enhancing the development of higher m and n modes. At a relatively large separation, the good development of higher m and n modes greatly reduces the reconnection rate and suppresses the development of the main mode, resulting in the main mode not being able to develop sufficiently large to generate the position changes of 3/1 islands.
- toroidal mode coupling,
- higher m and n modes,
- explosive growth,
- reconnection rate,
- position change

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Acknowledgments

This study was supported by the National MCF Energy R&D Program of China (Nos. 2022YFE03100000 and 2019YFE03030004), National Natural Science Foundation of China (No. 11835010), the Natural Science Foundation of Shandong Province (No. ZR2021MA074), and the National College Students’ Innovation and Entrepreneurship Training Program (No. 202211066017).

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