Numerical simulation of effect of synergy between low-frequency MHD instabilities on fast ion behaviors in tokamak plasmas

In tokamak experiments, various MHD instabilities usually co-exist and interact with fast particles. It can cause significant particle transport loss, pose damage to the first wall, leading discharge quench in tokamak. Therefore, understanding physical mechanism of caused by is a crucial but urgently solved issue for steady-state long pulse operation future reactor-graded devices. Based on experimental phenomenon synergy between nonresonant internal kink mode tearing observed NSTX, spherical device, this paper utilizes global nonlinear hybrid-kinetic simulation code M3D-K compare characteristics redistribution two cases: I) only non-resonant modes; II) mode. The transport, loss such studied. results show that significantly enhance main reason provide radial channel particles mitigate from plasma core boundary accompanied total stochasticity magnetic topology. These help understand low-frequency fusion reactors, some new ideas finding strategies control level reactors.