Fig. 1: Overview of MAST-U plasma shapes and divertor processes.
From: Divertor shaping with neutral baffling as a solution to the tokamak power exhaust challenge
a Overview of the magnetic geometry for the Super-X Divertor (SXD34, blue), Elongated Divertor (ED, green) and Conventional Divertor (CD, green), from the indicated discharges/times together with the fuelling (D2) location and first wall geometry. b Lower divertor with diagnostic coverage of the Divertor Monitoring Spectrometer (DMS, grey)8,40, X-point position and neutral baffle location (shaded cyan). c Schematic illustration of the characteristic processes in a detached MAST-U Super-X divertor featuring the ion source (magenta), Molecular Activated Recombination (MAR) ion sink (orange) and Electron Ion Recombination (EIR) ion sink (cyan). d Measured 1D profile of the schematic divertor processes in (c), obtained from line-integrated spectroscopic inferences (# 46860 at 45% Greenwald fraction34) (ions m−2 s−1) as function of poloidal distance from the X-point to the target, indicated with a grey arrow in both c and d. The detachment (or ionisation) front position is indicated with a dotted magenta line in both c and d. The experimental results in (d) are derived from a probabilistic sample obtained from a Bayesian spectroscopic analysis, showing the median (solid lines) and the 68% equal-tailed confidence interval (shaded region). See ‘Methods’ section for more information about the analysis and uncertainty propagation.
