Fig. 4: Power flow and 1D ion sources/sinks show similar divertor conditions at same poloidal distance to X-point.
From: Divertor shaping with neutral baffling as a solution to the tokamak power exhaust challenge
Spectroscopically inferred line-integrated ion sources (magenta) and sinks (Molecular Activated Recombination (MAR) - orange; Electron-Ion Recombination - cyan) (part. m−2 s−1) for the Super-X (SXD) (a), Elongated (ED) (b) and Conventional (CD) (c) Divertors at fGW = 35% as function of poloidal distance to the X-point. The red (CD), green (ED) and blue (SXD) vertical coloured dotted lines indicate their respective strike point positions, indicated by their magnetic geometry (d–f). The 1D ion source/sink profiles (a, b, c) are extended downstream of their respective strike-points due to convolution of the radial-extent of the SOL/far-SOL with the spectroscopic lines-of-sight, where the plasma is colder than at the separatrix. g Power flow (W) towards the divertor targets as function of poloidal distance to the X-point from the divertor entrance to the target for the CD (red), ED (green) and SXD (blue) at fGW = 35%, with vertical dotted lines indicating their respective strike points. The part where the divertor leg is detached is shaded in grey in grey. The power flow is inferred by subtracting from \({P}_{{{{\rm{div}}}}}\) the cumulative sum of the hydrogenic power losses from upstream to the target. The results are derived from a probabilistic sample obtained from a Bayesian spectroscopic analysis, showing the median and the 68% equal-tailed confidence interval (shaded region). See Methods section for more information about the analysis and uncertainty propagation.
