Nonlinear Evolution of the Kink Ballooning Mode in a Toroidal Plasma

Abstract

The nature of nonlinear evolution of the kink ballooning mode for the aspect ratio, R⁄a=2 and the parameter dependence on the critical β have been investigated by a three dimensional MHD simulation based on a rectangular torus model. Consequently, it turns out that ballooning modes form large convective cells concentrated in regions of unfavourable curvature of the magnetic field line for a high-β plasma. Moreover, a stable equilibrium is found with up 5% average β value by adjusting the vertical magnetic field and the diamagnetic effect.