中国物理B ›› 2005, Vol. 14 ›› Issue (8): 1604-1607.doi: 10.1088/1009-1963/14/8/024

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

Stabilizing effect of ion pressure gradient on magnetic curvature-driven drift modes located at rational surface of tokamak plasma

王爱科   

  1. Southwestern Institute of Physics, Chengdu 610041, China
  • 收稿日期:2004-10-29 修回日期:2004-12-02 出版日期:2005-07-13 发布日期:2005-07-13
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10375019 and 10135020).

Stabilizing effect of ion pressure gradient on magnetic curvature-driven drift modes located at rational surface of tokamak plasma

Wang Ai-Ke (王爱科)   

  1. Southwestern Institute of Physics, Chengdu 610041, China
  • Received:2004-10-29 Revised:2004-12-02 Online:2005-07-13 Published:2005-07-13
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10375019 and 10135020).

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摘要： In the fluid model, we derive a dispersion relation for the toroidal drift modes of tokamak plasmas, including the ion pressure gradient and the magnetic field gradient and curvature. It is shown that the magnetic field gradient and curvature (MFGC) can cause instabilities at the rational surface, which are of toroidicity-induced (TI) modes. On the other hand, it is discovered that the ion pressure gradient can stabilize the present MFGC instabilities. The critical threshold of ion pressure gradient, which makes the growth rate reduced to zero, is obtained both analytically and numerically.

Abstract: In the fluid model, we derive a dispersion relation for the toroidal drift modes of tokamak plasmas, including the ion pressure gradient and the magnetic field gradient and curvature. It is shown that the magnetic field gradient and curvature (MFGC) can cause instabilities at the rational surface, which are of toroidicity-induced (TI) modes. On the other hand, it is discovered that the ion pressure gradient can stabilize the present MFGC instabilities. The critical threshold of ion pressure gradient, which makes the growth rate reduced to zero, is obtained both analytically and numerically.

Key words: magnetic field gradient and curvature, drift mode, stabilization

中图分类号:  (Drift waves)

  • 52.35.Kt
52.55.Fa (Tokamaks, spherical tokamaks) 52.65.Kj (Magnetohydrodynamic and fluid equation)