测地声模的径向随机定域化

The radial stochastic localization of geodesic acoustic mode

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。

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.