Bremen 2017 – scientific programme
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P: Fachverband Plasmaphysik
P 28: Helmholtz Graduate School III
P 28.5: Talk
Thursday, March 16, 2017, 15:40–16:05, HS 1010
Interpretation of the Electron Cyclotron Emission of hot thermal and non-thermal ASDEX Upgrade plasmas — •Severin S. Denk1,2, Rainer Fischer1, Joan Decker3, Omar Maj1, Stefan K. Nielsen4, Morten Stejner4, Emanuele Poli1, Jörg Stober1, Ulrich Stroth1,2, Wolfgang Suttrop1, Branka Vanovac5, Egbert Westerhof5, Matthias Willensdorfer1, and The ASDEX Upgrade Team1 — 1MPI für Plasmaphysik, Garching, Germany — 2Physik-Department E28, TUM Garching, Germany — 3EPFL, Centre de Recherches en Physique des Plasmas Lausanne, Switzerland — 4Department of Physics, DTU, Lyngby, Denmark — 5FOM-Institute DIFFER, Eindhoven, The Netherlands
The electron cyclotron emission (ECE) diagnostic is a well established and robust instrument for the measurement of the electron temperature Te. However, the conventional interpretation of ECE measurements is inaccurate near the plasma edge, for Te > 7 keV, and for plasmas with fast electron populations. It will be shown that these limitations can be overcome if the electron cyclotron radiation transport is integrated in the analysis of the ECE measurements. For hot plasmas the accuracy of the radiation transport model could be greatly improved, by extending the model with a fully relativistic absorption coefficient, where the dispersion of the plasma is considered in the cold plasma limit. Furthermore, the model allows the ECE by fast electrons to be estimated. Moreover, models predicting the formation of fast electron populations will be compared with experimental observations.