Fig. 2: Improved divertor performance without adverse impact core for long-legged divertors.
From: Divertor shaping with neutral baffling as a solution to the tokamak power exhaust challenge
Comparison of divertor (a, b, c) and core (d, e, f, g, h) performance as function of core Greenwald fraction (fGW in %) for the CD (red), ED (green) and SXD (blue). Divertor parameters: a Integrated ion target flux (symbols) (with polynomial fits (solid, shaded line)), b detachment (ionisation) front position as poloidal distance to the target, c estimated perpendicular target heat load on a logarithmic scale, combining Langmuir probe and spectroscopy measurements (see Methods)8,40. The results in (b and c) 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. Core parameters: d–g core electron temperatures and densities at two different core Greenwald fractions (corresponding to vertical dotted lines in (a, b, c, h)) indicated by blue crosses (SXD), green dots (ED) and red plusses (CD), h PSOL (solid lines) deduced from the following contributors: NBI absorption (TRANSP, dashed lines); Ohmic heating (EFIT, not shown); changes to stored energy (EFIT, not shown) and core radiative losses (bolometry, dotted lines).
