SMuK 2021 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 17: Poster II
P 17.14: Poster
Freitag, 3. September 2021, 14:00–16:00, P
Determination of 2D Filament Temperatures and Densities at ASDEX Upgrade with the Thermal Helium Beam Diagnostic — •Daniel Wendler1,2, Michael Griener1, Gregor Birkenmeier1,2, Rainer Fischer1, Ralph Dux1, Elisabeth Wolfrum1, Ulrich Stroth1,2, and the ASDEX Upgrade team1 — 1Max-Planck- Institut für Plasmaphysik, Garching, Germany — 2Physik Department E28, TUM, Garching, Germany
In all plasma scenarios in magnetic confinement fusion, small filamentary structures appear in the scrape-off layer (SOL), with a locally strongly enhanced density, which propagate convectively outwards. Blobs contribute to reactor relevant phenomena like the density shoulder formation, large first wall particle fluxes and the broadening of the divertor heat flux fall-off length. To calculate the effective power flux which is carried by the filaments, temperature and density as well as the frequency and velocity of blobs have to be determined. While the measurements of mean blob velocities are possible with various diagnostics, the simultaneous non-invasive measurement of temperatures and densities of single filaments is now possible with the thermal helium beam diagnostic. By means of a grid of poloidally and radially distributed lines of sight, the temperature, density and velocities as well as the blob shape can be determined in two dimensions. Another way of measuring the filament temperature and density is beam emission spectroscopy, in the case here measured with a thermal helium beam diagnostic. First results of blob temperatures and densities will be shown and an extended collisional-radiative model will be presented.