| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Synergistic Influences of Kinetic Effects from Thermal Particles and Fast Ions on Internal Kink Mode |
| Yutian Miao1,2, G. Z. Hao2*, Yue Liu1*, H. D. He2, W. Chen2, Y. Q. Wang2, A. K. Wang2, and M. Xu2 |
1Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, China
2Southwestern Institute of Physics, Chengdu 610041, China
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| Cite this article: |
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Yutian Miao, G. Z. Hao, Yue Liu et al 2021 Chin. Phys. Lett. 38 085202 |
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Abstract The kinetic effects of thermal particles and fast ions on internal kink (IK) mode are numerically investigated by the MHD-kinetic hybrid code MARS-K. It is shown that either thermal particles or fast ions have stabilizing influence on IK. However, the former can not fully stabilize IK, and the later can suppress the IK. In addition, the synergistic effect from thermal particles and fast ions induces more stronger damping on IK. The kinetic effects from particles significantly raise the critical value of poloidal beta ($\beta_{\rm p}^{\rm crit}$) for driving IK in the toroidal plasma. This implies a method of controlling IK or sawtooth in the high-$\beta_{\rm p}$ discharge scenario of tokamak. It is noted that, at the $q=1$ rational surface, mode structure becomes more sharp due to the self-consistent modification by particles' kinetic effect.
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Received: 08 April 2021
Editors' Suggestion
Published: 02 August 2021
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| PACS: |
96.25.St
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(Plasma and MHD instabilities)
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96.50.Vg
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(Energetic particles)
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52.55.Pi
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(Fusion products effects (e.g., alpha-particles, etc.), fast particle effects)
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52.65.-y
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(Plasma simulation)
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| Fund: Supported by the National Key R&D Program of China (Grant No. 2019YFE03050003), the National Magnetic Confinement Fusion Science Program (Grant No. 2018YFE0304103), and the National Natural Science Foundation of China (Grant Nos. 11775067 and 11905067). |
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