ELM Suppression and Flow Damping with N=1 RMP Fields in Tokamaks Plasmas

Controlling large edge localized modes (ELMs) is critical for tokamaks operating in H-mode, due to potentially severe consequences on material damages caused by ELM bursts in future large scale devices such as ITER [1]. Resonant magnetic perturbation (RMP) has been extensively applied to mitigate or suppress ELMs [2]. In this work, we report two new recent results on the effect of the n = 1 (n is the toroidal mode number) RMP fields on ELMs and the associated plasma transport. One is the experimental result on the HL-2A tokamak, where large type-I ELMs were for the first time on this device suppressed by the applied n = 1 RMP. The other is the toroidal modeling study on the plasma core flow damping by the applied n = 1 RMP, with computational results quantitatively agreeing with experiments in ASDEX Upgrade.