Fig. 5: Plasma parameters for a fully automated ELM suppression discharge (#31873) with integrated RMP optimization.
From: Highest fusion performance without harmful edge energy bursts in tokamak
a RMP coil current (IRMP, blue) and particle recycling light (Dα emission, orange) near outer divertor target. b Normalized confinement time (H89, blue) and figure of merit (G, orange). c Phasing between top/middle (ϕT, blue) and middle/bottom coils (ϕB, orange). d Current amplitude ratio between of top/middle (RM, blue) and top/bottom coils (RB, orange). e Ratio (ϵ = rB,ML/rB,STD) of 3D-coil induced rB from ML-3D (rB,ML) and predicted one using an empirical configuration (rB,STD). Smaller ϵ means lower rB than the one by standard (empirical) setup. The gray dotted line in c, d shows the 3D-coil configurations from a standard (empirical) setup. The red-colored area highlights the automated access to the ELM-suppressed state without pre-programmed 3D fields. The green arrows in b, e highlight the confinement recovery and enhanced field optimization by the control algorithm. The optimization algorithm is triggered at 4.5 s.
