中国物理B ›› 2017, Vol. 26 ›› Issue (8): 85201-085201.doi: 10.1088/1674-1056/26/8/085201

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Energetic-ion excited internal kink modes with weak magnetic shear in q0 >1 tokamak plasmas

Wen-Ming Chen(陈文明), Xiao-Gang Wang(王晓钢), Xian-Qu Wang(王先驱), 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
  • 收稿日期:2017-02-25 修回日期:2017-04-12 出版日期:2017-08-05 发布日期:2017-08-05
  • 通讯作者: Xiao-Gang Wang E-mail:xgwang@hit.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 11261140326).

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. 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
  • Received:2017-02-25 Revised:2017-04-12 Online:2017-08-05 Published:2017-08-05
  • Contact: Xiao-Gang Wang E-mail:xgwang@hit.edu.cn
  • About author:0.1088/1674-1056/26/8/
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 11261140326).

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摘要：

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.

关键词: tokamak instabilities, low magnetic shear, internal kink mode

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.

Key words: tokamak instabilities, low magnetic shear, internal kink mode

中图分类号:  (Magnetohydrodynamics (including electron magnetohydrodynamics))

  • 52.30.Cv
52.35.Py (Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)) 52.55.Pi (Fusion products effects (e.g., alpha-particles, etc.), fast particle effects)