有磁辫等离子体的双撕裂模研究

在电磁流体力学范围内研究了与磁辫相联系的反常电子粘滞性效应所驱动的双撕裂模的线性行为。采用分区处理方法得到了该模式的一个近似色散关系。如果在x=±x_s处的两个有理面间的距离足够小x_s/α《(k_yα)^-11/15R^-11/15],则所得增长率的变化规律为τ_v^-1/5,随着该距离的增大,增长率过渡为τ_r^-1/3定标。τ_v^-1/5定标被证明为与撕裂层中不变φ近似的失效有关。 关键词：

DOUBLE TEARING MODE IN PLASMA WITH MAGNETIC BRAIDING

The linear behavior of the double tearing mode driven by anomolous electron viscosity effects associated with magnetic braiding is investigated within the framework of MHD. A two-space-scale analysis is performed and the result is used to obtain an approximate dispersion relation for the mode. If the seperation of the rational surfaces at x =±x_s is sufficiently small, x_s/ α<<(k_yα)^-11/15R^-1/15, the growth rate is predicted to scale as R^-1/15. With increa-sing seperation the mode makes a transition to R^-1/3 scaling, where R = τ_v/τ_H. The R^-1/5 scaling is shown to be correlated with violation of the constant-φ approximation.