| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Energetic-ion excited internal kink modes with weak magnetic shear in q0 >1 tokamak plasmas |
| Wen-Ming Chen(陈文明)1, Xiao-Gang Wang(王晓钢)2, Xian-Qu Wang(王先驱)3, Rui-Bin Zhang(张瑞斌)1 |
1 State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China;
2 Department of Physics, Harbin Institute of Technology, Harbin 150001, China;
3 Institute of Fusion Science, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China |
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Abstract The energetic particle driven internal kink mode is investigated in this paper for q0 > 1 tokamak plasma with weak magnetic shear. With the effect of energetic particles, the m/n = 1/1 internal mode structure in tokamak plasma does not appear as a rigid step-function when safety factor passes through q= 1 rational surface. It is found that even when the rational surface is removed, the mode may be still unstable under the low magnetic shear condition if the energetic particle drive is strong enough; with the low shear region of safety factor profile widening, the mode becomes more unstable with its growth-rate increasing. Furthermore, we find that the existence of the q = 1 rational surface does not have a significant effect on the stability of the plasma if energetic particles are present, which is very different from the scenarios of the ideal-MHD modes.
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Received: 25 February 2017
Revised: 12 April 2017
Accepted manuscript online:
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PACS:
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52.30.Cv
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(Magnetohydrodynamics (including electron magnetohydrodynamics))
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52.35.Py
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(Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.))
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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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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11261140326). |
Corresponding Authors:
Xiao-Gang Wang
E-mail: xgwang@hit.edu.cn
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| About author: 0.1088/1674-1056/26/8/ |
Cite this article:
Wen-Ming Chen(陈文明), Xiao-Gang Wang(王晓钢), Xian-Qu Wang(王先驱), Rui-Bin Zhang(张瑞斌) Energetic-ion excited internal kink modes with weak magnetic shear in q0 >1 tokamak plasmas 2017 Chin. Phys. B 26 085201
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