Influence of the plasma background on 3D scrape-off layer filaments

Influence of the plasma background on 3D scrape-off layer filaments

Influence of the plasma background on 3D scrape-off layer filaments 150 150 Mathew
UKAEA-CCFE-PR(18)21

Influence of the plasma background on 3D scrape-off layer filaments

This paper presents the effect of self-consistent plasma backgrounds including plasma-neutral interactions, on the dynamics of filament propagation. The principle focus is on the influence of the neutrals on the filament through both direct interactions and through their influence on the plasma background. Both direct and indirect interactions influence the motion of filaments. A monotonic increase of filament peak velocity with upstream electron temperature is observed, while a decrease with increasing electron density is observed. If ordered by the target temperature, the density dependence disappears. Smaller filaments keep a density dependence, which can be explained by the density dependence of the plasma viscosity. The critical size δ∗, where filaments are fastest, is shifted to larger sizes for higher densities, due to the plasma viscosity. If the density dependence of the plasma viscosity is removed, δ∗ has no temperature dependence, but rather a density dependence.

Collection:
Journals
Journal:
Plasma Physics and Controlled Fusion
Publisher:
IOP
Published date:
06/12/2018