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核聚变与等离子体物理 ›› 2012, Vol. 32 ›› Issue (2): 97-102.

• 等离子体物理学 •    下一篇

Suydam不稳定性的增长率

石秉仁   

  1. (核工业西南物理研究院,成都 610041)
  • 收稿日期:2011-10-13 修回日期:2012-02-02 出版日期:2012-06-15 发布日期:2011-06-14
  • 作者简介:石秉仁(1937-),男,浙江省兰溪市人,研究员,北京大学原子能系核物理专业毕业,从事核聚变与等离子体物理理论研究。
  • 基金资助:

    国家磁约束聚变科学研究计划支持项目(2009GB101002)

Growth rate of the Suydam instability

SHI Bing-ren   

  1. (Southwestern Institute of Physics, Chengdu 610041)
  • Received:2011-10-13 Revised:2012-02-02 Online:2012-06-15 Published:2011-06-14

摘要:

证明了用能量原理推导出的关于圆柱等离子体局部模的Suydam不稳定性,对应的动能变化量趋于无穷大,故其增长率趋于零。通过对 Hain-Lust方程求解知道,Suydam不稳定性的真实物理意义是,它对应于一系列低模数的广域不稳定模,其增长率随模数加大而减小。实际上,任何扭曲模分析都一定要正确处理共振面附近的求解问题。提出了不满足Suydam判据时外扭曲模的一个求解方法。

关键词: 局部模不稳定性, Suydam判据, 不稳定性增长率

Abstract:

It is shown that the variation of the kinetic energy for Suydam instability of a cylindrical plasma derived from the energy principle is infinite,implying that the growth rate of such instability is zero. Realistic physical meaning of the Suydam instability can be correctly explained by the solution of the Hain-Lust equations. Accomplished works so far are simply commented. Finally, a method is suggested to determine the stability of the externally kink modes for a tokamak plasma when in its internal region the Suydam criterion is unsatisfied.

Key words: Local instability, Suydam criterion, Growth rate of the instability

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