Abstract
The effect of 2D transport in the tokamak scrape-off layer (SOL) on relating measured divertor heat-flux profiles to midplane plasma profiles is explored with the UEDGE code for a range of transport assumptions. The relationship between the divertor heat-flux profile and the midplane plasma temperature profile as determined from UEDGE is compared to commonly used predictions from 1D and “2-point” analytic relation. Results show that the parametric variation in λq,div with midplane separatrix values follows the conduction-limited 2-point model, though the actual value of q// on a given flux surface is much lower than implied by the midplane Te,sep, and λq,div is ∼ twice as wide as expected from these models. Poloidal variations in χ result in minimal change to radial profiles and probably can’t be distinguished experimentally from cases with uniform χ having the same flux-surface average value.
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