39 / 2021-04-23 17:26:25

Numerical Research of Effects of External Non-Resonant Magnetic Perturbations on Plasma Instabilities

plasma instabilities, non-resonant magnetic perturbation field, runaway electrons

Simulations of the influence of external non-resonant magnetic perturbation field (non-RMP) on plasma instabilities are performed with the 3D magnetohydrodynamic code called NIMROD. And non-RMP with the dominant mode of m/n=-1/1 is used as the boundary condition of NIMROD simulations. Simulation results show that magnetic perturbation of plasma is supressed with the addition of non-RMP. And in a certain range, the larger the amplitude of the non-RMP is, the more obvious the suppression effects on plasmas perturbation of n=1 is. Moreover, the effects of non-RMP on plasma disruption is investigated. It was found that non-RMP could not only significantly reduce the amplitude and rate of instability growth, but also promote the expelling of runaway electrons (REs) during disruption.