Numerical simulation of plasma response to externally applied resonant magnetic perturbation on the J-TEXT tokamak

Abstract

Nonlinear magnetohydrodynamic (MHD) simulations of an equilibrium on the J-TEXT tokamak with applied resonant magnetic perturbations (RMPs) are performed with NIMROD (non-ideal MHD with rotation, open discussion). Numerical simulation of plasma response to RMPs has been developed to investigate magnetic topology, plasma density and rotation profile. The results indicate that the pure applied RMPs can stimulate 2/1 mode as well as 3/1 mode by the toroidal mode coupling, and finally change density profile by particle transport. At the same time, plasma rotation plays an important role during the entire evolution process.

Suppression of runaway electrons by mode locking during disruptions on J-TEXT

“…The NIMROD MHD with rotation, open discussion) extended MHD code [46][47][48][49] was used to simulate the plasma response to an externally applied resonant magnetic perturbation on the J-TEXT tokamak [50]. For J-TEXT, the experimental Lundquist numbers fall in the range of 10 6 -10 7 , and in order to reduce the expense of the computation, the real Lundquist number used is 10 5 by enhancing the resistivity artificially in this simulation.…”