Fig. 1: Proxy error field applied by KSTAR 3D coils.
From: Tailoring tokamak error fields to control plasma instabilities and transport
a The actual geometry of 3D coils and perturbed flux surface due to the plasma response (perturbation is not big enough to see the distortion of flux surface in this figure). b The externally applied normal magnetic field at the plasma boundary (\(\delta {B}_{{{{{{{{\rm{n}}}}}}}}}^{{{{{{{{\rm{x}}}}}}}}}\)) and a schematic view of 3D coils projected on the plasma boundary. c From top to bottom: the time evolution of the plasma current, 3D field amp., stored energy, Dα emission (particle recycling light) spike that shows disruptive plasma instability, line averaged density (\({\bar{n}}_{{{{{{{{\rm{e}}}}}}}}}\)), electron temperature (Te) due to the slow increase of the proxy n = 1 error field (IT) without the error field correction.
