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核聚变与等离子体物理 ›› 2013, Vol. 33 ›› Issue (2): 97-101.

• 等离子体物理学 •    下一篇

测地声模的径向随机定域化

章扬忠   

  1. (中国科学院磁聚变理论中心,合肥 230031)
  • 收稿日期:2012-11-19 修回日期:2013-02-01 出版日期:2013-06-15 发布日期:2013-06-14
  • 作者简介:章扬忠(1941-),男,北京市人,物理学博士,从事物理和信息理论研究。
  • 基金资助:

    ITER-China Program (2010GB107000);National Natural Science Foundation of China (NSFC-11075162)

The radial stochastic localization of geodesic acoustic mode

ZHANG Yang-zhong   

  1. (Center for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031)
  • Received:2012-11-19 Revised:2013-02-01 Online:2013-06-15 Published:2013-06-14

摘要:

在文献[1]中,通过分析实验上观察到的测地声模的小密度-电位比与测地声模谐波定级的自洽性,论证了测地声模是在转向点附近一种“蝌蚪状”的定域结构,但没有给出导致这种结构的物理机制。从随机媒质对波传播产生定域化的角度进行了探讨,采用测地声模由漂移波湍流参量激发的产生模型,计算了随机定域化导致的也是文献[1]所关注的相干长度。讨论了与实验观测比较的有关问题。

关键词: 测地声模, 径向局部模, 随机定域化, Anderson 定域化, 托卡马克

Abstract:

In the previous paper “The ‘tadpole’ localization in radial structure of geodesic acoustic mode” [Ref.1], it was shown that the radial structure of geodesic acoustic mode (GAM) near turning point appears to be a ‘tadpole’ structure based on the consistency of GAM ordering with the experimentally observed small density to potential ratio without invoking the specific physical mechanism. The mechanism, so-called stochastic localization, is analyzed in the present paper in the framework of parametric destabilization to GAM, the coherent length, which remains to be answered in [Ref.1], is calculated and some aspects related with experiments are discussed.

Key words: Geodesic acoustic mode, Radial local mode, Stochastic localization, Anderson localization, Tokamak

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