Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Poster Session: Magnetic Confinement
P 12.3: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Influence of neutral-plasma interactions on 3D scrape-off layer filaments — •David Schwörer1,2, Nick Walkden2,3, Ben Dudson3, Fulvio Militello2, Huw Leggate1, Turlough Downes1, and Miles Turner1 — 1Dublin City University, Ireland — 2Culham Center of Fusion Energy, UK — 3York University, UK
Filaments are field aligned density and temperature perturbations, which can carry a significant amount of particles and heat from the last closed flux surface to the far scrape-off layer (SOL). This transport mechanism is highly non diffusive. It is important to understand and predict the motion of filaments, as they can cause a significant heat load onto first wall materials. This is especially of interest in regard to the design of future fusion devices.
Recent experiments have shown that the density of the SOL can have a significant influence on the dynamics of filaments.
We have carried out non-linear, three-dimensional simulations, including neutral-plasma interactions, implemented in BOUT++. By selectively including neutral-filament interactions, direct interaction with neutrals are decoupled from indirect ones, where neutrals affect the filaments through a change in background profiles. The heat and particle influx is varied, generating self-consistent profiles that reproduce both sheath limited and high recycling regimes. These profiles are used as a background for full three-dimensional fluid simulations of the filament. A systematic increase of neutral model complexity is carried out, from static neutral background to full neutral fluid evolution. This will help to understand and interpret the results of experimental measurements.