Dynamics of 3D isolated thermal filaments
Artikel i vetenskaplig tidskrift, 2016

Simulations have been carried out to establish how electron thermal physics, introduced in the form of a dynamic electron temperature, affects isolated filament motion and dynamics in 3D. It is found that thermal effects impact filament motion in two major ways when the pressure perturbation within the filament is supported primarily through a temperature increase as opposed to density: they lead to a strong increase in filament propagation in the bi-normal direction and a significant decrease in net radial propagation. Both effects arise from the temperature dependence of the sheath current which leads to a non-uniform floating potential, with the latter effect supplemented by faster pressure loss. The reduction in radial velocity can only occur when the filament cross-section loses angular symmetry. The behaviour is observed across different filament sizes and suggests that filaments with much larger temperature perturbations than density perturbations are more strongly confined to the near SOL region.

filament motion

convective-transport

Physics

devices

temperature perturbations

boundary

plasma edge

blobs

edge turbulence

scrape-off-layer

thermal effects

Författare

N. R. Walkden

Culham Lab

Luke Easy

University of York

Culham Lab

F. Militello

Culham Lab

John Omotani

Chalmers, Fysik, Subatomär fysik och plasmafysik

Plasma Physics and Controlled Fusion

0741-3335 (ISSN) 1361-6587 (eISSN)

Vol. 58 11 115010-

Drivkrafter

Hållbar utveckling

Styrkeområden

Energi

Fundament

Grundläggande vetenskaper

Ämneskategorier

Fusion, plasma och rymdfysik

DOI

10.1088/0741-3335/58/11/115010

Mer information

Senast uppdaterat

2018-03-06