We have found numerically that damping phases appear in the time evolution of the perturbation energy of high-n ballooning modes in the presence of toroidal flow shear, where n is a toroidal mode number. The damping dominates exponential growth which occurs in the bad curvature region, resulting in stabilization of ballooning modes. D-shaping of plasma cross-section, reduction of aspect ratio, and arrangement of an X-point at inner side of the torus enhance the stabilization effect of the toroidal flow shear through this mechanism.
我们数值上发现，在存在环形流剪切的情况下，高n气球模扰动能量的时间演化中出现阻尼现象，其中n为环形模数。该阻尼主导了在坏曲率区域发生的指数增长，从而导致气球模的稳定化。等离子体横截面的D形化、纵横比的减小以及X点位于环内侧的布置，通过这一机制增强了环形流剪切的稳定化效应。