Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 5: Poster Session- Helmholtz Graduate School for Plasma Physics
P 5.8: Poster
Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof
Status of the new thermal He-beam diagnostic for electron density and temperature measurements in the scrape-off layer of ASDEX Upgrade — •Michael Griener1,3, Elisabeth Wolfrum1, Thomas Eich1, Albrecht Herrmann1, Volker Rohde1, Oliver Schmitz2, Ulrich Stroth1,3, and the ASDEX Upgrade Team1 — 1Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany — 2Engineering Physics Department, University of Wisconsin-Madison, USA — 3Physik Department E28, Technische Universität München, 85748 Garching, Germany
In a nuclear fusion device a significant fraction of power is exhausted across the last closed flux surface into the so-called “scrape-off layer”. In order to study the transport dynamics to (a) the divertor via parallel heat flux and (b) to the wall via filaments, a diagnostic for the determination of ne and Te with high spatial and temporal resolution is required.
These data should be provided by the new thermal He-beam diagnostic, where helium is injected into the plasma by a piezo valve. The principle of this diagnostic is the measurement of line resolved emission intensities of the excited helium. The calculated line intensity ratios of two singlet lines combined with a collisional radiative model then lead to ne values, whereas singlet-triplet ratios yield Te values.
The principle of the He-diagnostic as well as emission profiles of several He I transitions measured during the campaign 2015/2016 will be shown. First calculated ne and Te profiles will be compared to data from the lithium beam and the Thomson scattering diagnostic.