Fig. 3: Optimized path to edge stability maintaining core stability.
From: Tailoring tokamak error fields to control plasma instabilities and transport
a From top to bottom: time evolution of the plasma stored energy showing confinement degradation, dynamic change of 3D coil variables (I = (IT, IM, IB, ϕMT, ϕBM)), and Dα emission (particle recycling light) showing ELM crashes and ELM suppression. b From top to bottom: time traces of the core resonant field (\(\delta {B}_{{{{{{{{\rm{core}}}}}}}}}\)), and edge resonant field (δBedge), and their ratio (\(\delta {B}_{{{{{{{{\rm{core}}}}}}}}}/\delta {B}_{{{{{{{{\rm{edge}}}}}}}}}\)) due to the optimal change of 3D coil variables. c The comparison of resonant field profiles (\(\delta {B}_{{{{{{{{\rm{res}}}}}}}}}\)) at 5 s (blue), at 7.1 s (black) with the optimized error field correction, and with the proxy error field IT = 5 kA without the error field correction (violet, dashed).
