Erlangen 2018 – scientific programme
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P: Fachverband Plasmaphysik
P 5: Helmholtz Graduate School II
P 5.1: Talk
Monday, March 5, 2018, 16:15–16:40, A 0.112
Bayesian inference of the electron cyclotron emission diagnostic at Wendelstein 7-X — •Udo Hoefel1, Neha Chaudhary1, Oliver Ford1, Matthias Hirsch1, Sehyun Kwak1, Nikolai B. Marushchenko1, Hans Oosterbeek1, Andrea Pavone1, Jonathan Schilling1, Torsten Stange1, Jakob Svensson1, Yuriy Turkin1, Gavin Weir1, Robert C. Wolf1,2, and the W7-X team1 — 1Institute for Plasma Physics, Greifswald branch — 2Technical University Berlin
Wendelstein 7-X (W7-X) is an optimized stellarator that uses a 32 channel heterodyne electron cyclotron emission radiometer (ECE) as a standard diagnostic to measure the electron temperature profile with high temporal resolution.
In order to obtain a systematic calibration procedure with rigorous uncertainty estimates, modelling within the Bayesian Minerva framework has been used to infer the absolute effective sensitivities and beam widths from a periodic switching between a (hot) source at room temperature and a (cold) source at liquid nitrogen temperature.
As the ECE measures the radiation temperature and not directly the local electron temperature, a Gaussian process based profile inversion has been done to extract the electron temperature profile. For this purpose, the radiation transport code TRAVIS has been implemented in Minerva, allowing complex models of multiple diagnostics to include ECE data.