Theoretical analysis of the saturation phase of the $1/1$ energetic-ion-driven resistive interchange mode*

The aim of the present study is to analyze the saturation of the energetic-ion-driven resistive interchange mode (EIC) in LHD plasma using FAR3d code. The non linear simulation results show similar $1/1$ EIC saturation phases with respect to the experimental observations, reproducing the enhancement of the $n/m = 1/1$ resistive interchange modes (RIC) amplitude and width as the EP $\beta$ increases, the EP $\beta$ threshold for the $1/1$ EIC excitation, the further destabilization of the $1/1$ EIC as the population of the helically trapped EP increases and the triggering of burst events.