Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 7: Magnetic Confinement I
P 7.4: Vortrag
Dienstag, 1. März 2016, 12:10–12:25, b305
The structure and dynamics of blob filaments in the stellarator TJ-K — •Stephen Garland1, Golo Fuchert2, and Mirko Ramisch1 — 1Institut für Grenzflächenverfahrenstechnik und Plasmatechnologie, Universität Stuttgart — 2Max-Planck-Institut für Plasmaphysik, Greifswald
Filamental structures with higher pressure than the background plasma are commonly observed in the scrape-off layer (SOL) of toroidal magnetic confinement devices. These structures, often referred to as blobs, propagate radially outwards and poloidally, contributing significantly to SOL transport. It is therefore important to study the properties of blobs in order to be able to predict heat loads on the plasma facing components of future reactors, as well as to better understand particle transport and plasma confinement.
Detailed experiments have been carried out into blob dynamics and structure using Langmuir probes at the stellarator TJ-K. By means of the conditional averaging technique, blob dynamics in a poloidal cross section have been studied, and the influence of geodesic curvature on poloidal blob drive will be shown. In addition, the result of simultaneous measurements at two toroidally separated locations will be presented, providing information on the 3D structure of blob filaments and their alignment to the magnetic field as they propagate through the SOL.