München 2019 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 18: Postersitzung
P 18.61: Poster
Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax
Simulations of 3D SOL filaments in detached conditions — •David Schwörer1,2, Nick Walkden2, Huw Leggate1, Ben Dudson3, Fulvio Militello2, and Miles M. Turner1 — 1Dublin City University, Dublin, Ireland — 2Culham Centre for Fusion Energy, Culham, UK — 3University of York, York, UK
Filaments are field aligned density and temperature perturbations, which provide a significant flux of particles and heat from the last closed flux surface to the far scrape-off layer (SOL). In order to design next generation tokamaks, it is beneficial to make robust predictions of wall fluxes, which requires understanding of these non-diffusive transport mechanisms.
We have carried out non-linear, three-dimensional simulations, including neutral-plasma interactions, using the STORM module for BOUT++. The heat and particle influx is varied, generating self-consistent 1D profiles that reproduce detached divertor conditions. Filaments were seeded on the backgrounds, and the resulting filament motion was studied. In attached conditions we found a strong target temperature dependence, while in detached conditions we found the filament to be electrically insulated from the sheath, caused by a high resistivity in the cold area adjacent to divertor target. In general a decreasing trend of the radial filament velocity with increasing density is observed, however on the onset of divertor detachment this trend is temporarily broken as the filament becomes electrically isolated from the divertor target.