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Impact of spatially varying transport coefficients in EMC3-Eirene simulations of W7-X and assessment of drifts

Authors :
Bold, David
Reimold, Felix
Niemann, Holger
Gao, Yu
Jakubowski, Marcin
Killer, Carsten
Winters, Victoria R.
Maaziz, Nassim
team, the W7-X
Publication Year :
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 $D \approx 0.2$ is needed, $D \approx 1$ 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.<br />Comment: 15 pages, 13 figures. arXiv admin note: substantial text overlap with arXiv:2201.06341

Subjects

Subjects :
Physics - Plasma Physics

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.2407.12072
Document Type :
Working Paper