Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 16: Poster Session - Helmholtz Graduate School for Plasma Physics

P 16.12: Poster

Dienstag, 3. März 2015, 16:30–18:30, Foyer Audimax

A new thermal He-beam diagnostic for electron density and temperature measurements in the scrape-off layer of ASDEX Upgrade — •Michael Griener1, Elisabeth Wolfrum1, Thomas Eich1, Albrecht Herrmann1, Volker Rohde1, Oliver Schmitz2, Ulrich Stroth1,3, and the ASDEX Upgrade Team11Max 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 power is exhausted across the last closed flux surface into the so-called scrape-off layer, SOL. 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. Although the diagnostic capabilities of the ASDEX Upgrade edge plasma are excellent, there is a lack of spatially and temporally highly resolved electron temperature measurements in the SOL.

Therefore a piezo valve will be installed in ASDEX Upgrade in April 2015. It allows fast chopping of a thermal He-beam which is part of the new diagnostic. In the first campaign, existing lines of sight of the CXRS diagnostic will be used to measure various He I transitions to confirm the collisional radiative model for He.

The principle of the thermal He-diagnostic as well as calculations of the achievable spatial resolution of the initial set-up will be presented.

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