Impact of spatially varying transport coefficients in EMC3-Eirene simulations of W7-X and assessment of drifts
arxiv(2024)
Abstract
Modelling the scrape-off layer of a stellarator is challenging due to the
complex magnetic 3D geometry. The here presented study analyses simulations of
the scrape-off layer (SOL) of the stellarator Wendelstein 7-X (W7-X) using
spatially varying diffusion coefficients for the magnetic standard
configuration, extending our previous study. Comparing the EMC3-Eirene
simulations with experimental observations, an inconsistency between the
strike-line width (SLW) and the upstream parameters was observed. While to
match the experimental SLW a particle diffusion coefficient D ≈ 0.2 is
needed, D ≈ 1 is needed to get experimental separatrix temperatures of
50 eV at the given experimental heating power. We asses the impact of
physically motivated spatially varying transport coeffients. Agreement with
experimental data can be improved, but various differences remain. We show that
drifts are expected to help overcome the discrepancies and, thus, the
development of SOL transport models including drifts is a necessary next step
to study the SOL transport of the W7-X stellarator.
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