Jena 2013 – scientific programme
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P: Fachverband Plasmaphysik
P 10: Poster: Plasmadiagnostik
P 10.5: Poster
Wednesday, February 27, 2013, 16:30–18:30, Poster EG
Reconstruction of electron density perturbations using lithium beam emission spectroscopy — •Florian Martin Laggner1, Elisabeth Wolfrum2, Matthias Willensdorfer1, Gregor Birkenmeier2, Tatsuya Kobayashi3, Friedrich Aumayr1, and the ASDEX Upgrade Team2 — 1Institute of Applied Physics, Vienna University of Technology, EURATOM-ÖAW Association, Wiedner Hauptstr. 8-10, 1040 Vienna, Austria — 2Max Planck Institute for Plasma Physics, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany — 3Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan
The lithium beam diagnostic at ASDEX Upgrade is routinely used to measure plasma edge electron density (ne) profiles. With a recently installed diagnostics upgrade (better light sensitivity and faster data acquisition) one can resolve turbulent structures at the plasma edge.
A sensitivity study is performed to quantify the capabilities of the diagnostic. The response of the emission profile to a ne perturbation depends on the radial position of the perturbation. It is possible to resolve ne perturbations in the scrape off layer (SOL) with a high accuracy in perturbation height and width.
First experimental results from a 800 kA, ECRH heated, L-mode discharge are interpreted. The SOL ne perturbations reach 100% of the average ne value which is consistent with the SOL ne being dominated by intermittent bursts.