Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 5: Poster Session- Helmholtz Graduate School for Plasma Physics
P 5.19: Poster
Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof
Interpretation of the Electron Cyclotron Emission of hot ASDEX Upgrade plasmas at optically thin frequencies — •Severin Sebastian Denk1,2, Rainer Fischer1, Emanuele Poli1, Matthias Willensdorfer1, Omar Maj1, Jörg Stober1, Ulrich Stroth1,2, Wolfgang Suttrop1, and The ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, D-85748 Garching, Germany — 2Physik-Department E28, Technische Universität München, 85748 Garching, Germany
The electron cyclotron emission diagnostic (ECE) provides routinely electron temperature (Te) measurements. "Kinetic effects" (relativistic mass shift and Doppler shift) can cause the measured radiation temperatures (Trad) to differ from Te at cold resonance position complicating the determination of Te from the measured radiation temperature profile (Trad). For the interpretation of such ECE measurements an electron cyclotron forward model solving the radiation transport equation for given Te and electron density profiles is in use in the framework of Integrated Data Analysis at ASDEX Upgrade. While the original model lead to improved Te profiles near the plasma edge in moderately hot H-mode discharges, vacuum approximations in the model lead to inaccuracies given large Te. In hot plasmas "wave-plasma interaction", i.e. the dielectric effect of the background plasma onto the electron cyclotron emission, becomes important at optical thin measured frequencies. Additionally, given moderate electron densities and large Te, the refraction of the line of sight has to be considered for the interpretation of ECE measurements with low optical depth.