Journal
NUCLEAR FUSION
Volume 62, Issue 3, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1741-4326/ac46f8
Keywords
sawtooth; incomplete reconnection; plasmoid; secondary tearing instability
Categories
Funding
- National MCF Energy RD Program [2019YFE03090500, 2019YFE03030004]
- National Natural Science Foundation of China [12005185, 11775188, 11835010]
- Fundamental Research Fund for Chinese Central Universities [2021FZZX003-03-02]
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In this paper, we systematically investigate the nonlinear evolution of the resistive kink mode in the low resistivity plasma in Tokamak geometry. We find that the aspect ratio of the initial equilibrium can significantly influence the critical resistivity for plasmoid formation. Additionally, the critical resistivity for plasmoid formation decreases with increasing plasma viscosity in the moderately low resistivity regime. The geometry of Tokamaks also affects the critical resistivity for plasmoid formation.
In the present paper, we systematically investigate the nonlinear evolution of the resistive kink mode in the low resistivity plasma in Tokamak geometry. We find that the aspect ratio of the initial equilibrium can significantly influence the critical resistivity for plasmoid formation. With the aspect ratio of 3/1, the critical resistivity can be one magnitude larger than that in cylindrical geometry due to the strong mode-mode coupling. We also find that the critical resistivity for plasmoid formation eta (crit) decreases with increasing plasma viscosity in the moderately low resistivity regime. Due to the geometry of Tokamaks, the critical resistivity for plasmoid formation increases with the increasing radial location of the resonant surface.
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