| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes in tokamak plasmas with reversed magnetic shear |
| Shuai Jiang(姜帅), Zheng-Xiong Wang(王正汹)†, Lai Wei(魏来), and Tong Liu(刘桐) |
| Key Laboratory of Materials Modification by Beams of the Ministry of Education, School of Physics, Dalian University of Technology, Dalian 116024, China |
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Abstract Effects of plasma radiation on the nonlinear evolution of neo-classical double tearing modes (NDTMs) in tokamak plasmas with reversed magnetic shear are numerically investigated based on a set of reduced magnetohydrodynamics (MHD) equations. Cases with different separations $\varDelta_{\rm rs} =\left| {r_{\rm s2} -r_{\rm s1} } \right|$ between the two same rational surfaces are considered. In the small $\varDelta_{\rm rs} $ cases, the plasma radiation destabilizes the NDTMs and makes the kinetic energy still grow gradually in the late nonlinear phase. Moreover, the NDTM harmonics with high mode numbers reach a high level in the presence of plasma radiation, forming a broad spectrum of MHD perturbations that induces a radially broadened region of MHD turbulence. As a result, the profiles of safety factors also enter a nonlinear oscillation phase. In the intermediate $\varDelta_{\rm rs} $ case, the plasma radiation can advance the explosive burst of kinetic energy that results from the fast driven reconnection between the two rational surfaces, because it can further promote the destabilizing effects of bootstrap current perturbation on the magnetic island near the outer rational surfaces. In the large $\varDelta_{\rm rs} $ case, through destabilizing the outer islands significantly, the plasma radiation can even induce the explosive burst in the reversed magnetic shear configuration where the burst cannot be induced in the absence of plasma radiation.
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Received: 13 June 2023
Revised: 26 July 2023
Accepted manuscript online: 08 August 2023
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PACS:
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52.35.Hr
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(Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))
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52.30.Cv
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(Magnetohydrodynamics (including electron magnetohydrodynamics))
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52.35.Kt
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(Drift waves)
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| Fund: Project supported by the National Key R&D Program of China (Grant No. 2022YFE03090000), the National Natural Science Foundation of China (Grant No. 11925501), and the Fundament Research Funds for the Central Universities (Grant No. DUT22ZD215). |
Corresponding Authors:
Zheng-Xiong Wang
E-mail: zxwang@dlut.edu.cn
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Cite this article:
Shuai Jiang(姜帅), Zheng-Xiong Wang(王正汹), Lai Wei(魏来), and Tong Liu(刘桐) Effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes in tokamak plasmas with reversed magnetic shear 2023 Chin. Phys. B 32 105203
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