Effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes in tokamak plasmas

Shuai JIANG; Weikang TANG; Lai WEI; Tong LIU; Haiwen XU; Zhengxiong WANG

doi:10.1088/2058-6272/ac500b

Plasma Science and Technology > 2022 > 24(5): 055101. > DOI: 10.1088/2058-6272/ac500b

Shuai JIANG, Weikang TANG, Lai WEI, Tong LIU, Haiwen XU, Zhengxiong WANG. Effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes in tokamak plasmas[J]. Plasma Science and Technology, 2022, 24(5): 055101. DOI: 10.1088/2058-6272/ac500b

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Effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes in tokamak plasmas

Key Laboratory of Materials Modification by Beams of the Ministry of Education, School of Physics, Dalian University of Technology, Dalian 116024, People's Republic of China

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Author Bio:
Zhengxiong WANG, E-mail: zxwang@dlut.edu.cn
Received Date: November 30, 2021
Revised Date: January 04, 2022
Accepted Date: January 27, 2022
Available Online: December 11, 2023
Published Date: April 12, 2022

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Abstract

Abstract

The effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes are investigated based on a set of reduced magnetohydrodynamic equations. It is found that the radiation can reduce the pressure near the rational surface. During the nonlinear evolution, the magnitude of perturbed bootstrap current is drastically enhanced in the presence of the radiation. Besides, the radiation can increase the growth rate of the magnetic islands by diminishing the pressure, such that the magnetic islands do not saturate compared with that without radiation. On the other hand, with the increase of the ratio of parallel to perpendicular transport coefficient $χ_{||} / χ_{⊥},$ the reduction of pressure can further increase the growth rate of magnetic islands in the presence of plasma radiation. Finally, the mechanisms of the destabilizing effects driven by the radiation are discussed in detail as well.
- neo-classical tearing mode,
- radiation,
- MHD instability

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Acknowledgments

The authors thank Dr Huishan CAI for stimulating discussions on this work. This work is supported by the National Magnetic Confinement Fusion Energy R & D Program of China (Nos. 2019YFE03090300 and 2017YFE0301100), National Natural Science Foundation of China (Nos. 11925501 and 12075048), the Fundamental Research Funds for the Central Universities (Nos. DUT21GJ204 and DUT21LK28).

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