Bremen 2017 – scientific programme
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P: Fachverband Plasmaphysik
P 10: Theory and Modeling I
P 10.2: Talk
Tuesday, March 14, 2017, 14:30–14:45, HS 2010
Influence of plasma backgrounds including neutrals on SOL filaments using 3D simulations — •David Schwörer1,2, Nick Walkden2, Huw Legatte1, Fulvio Militello2, and Miles M. Turner1 — 1Dublin City University, Dublin, Ireland — 2Culham Centre for Fusion Energy, Culham, 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). In order to design next generation machines, understanding this non diffusive transport mechanism is beneficial to predict wall fluxes.
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 both low and high recycling regimes. Filaments where seeded on the backgrounds, and the resulting filament motion was studied. Additional to density and temperature scans, a scan in filament size was performed. This increases the understanding of filaments and their scaling with plasma background, in the experimentally relevant regime. These filaments radial velocity showed a linear increase in mid-plane background temperature T, lying between the T1/2 scaling for inertial limited and the T3/2 scaling for sheath limited filaments. The suitability of the target temperature as well as the average temperature instead of the upstream temperature as scaling quantity have been studied. With the exception of low temperatures, an increased density results in a decreased radial velocity.