Mitigation of plasma–wall interaction during quasi-single helicity states in RFX

Abstract The paper presents new results, obtained in the RFX device, about MHD mode locking in the reversed field pinch. The differences in the mode locking phenomenology between multiple helicity (MH) and quasi-single helicity (QSH) states are discussed, in particular as far as the plasma–wall interaction and the total radiation emission are concerned.