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P: Fachverband Plasmaphysik
P 6: Helmholtz Graduate School I
P 6.1: Poster
Montag, 13. März 2017, 16:30–18:30, HS Foyer
Electron Cyclotron Emission Diagnostic Calibration and First Heatwave Analysis Results at Wendelstein 7-X — •Udo Hoefel1,2, Hans-Jürgen Hartfuß1, Matthias Hirsch1, Sehyun Kwak1, Gregor Pechstein2, Stefan Schmuck3, Torsten Stange1, Jakob Svensson1, Gavin Weir1, Robert Wolf1,2, and the W7-X team1 — 1IPP, Greifswald, Germany — 2TU Berlin, Berlin, Germany — 3Culham Science Centre, Abingdon OX14 3DB, United Kingdom
Wendelstein 7-X (W7-X) is equipped with a 32 channel electron cyclotron emission (ECE) radiometer (with 16 additional high spatial resolution channels), that requires for the localisation of the radiative temperature measurement absorption and reemission respectively an optically thick plasma. The absolute calibration is done via a hot/cold source and a corresponding model in the MINERVA framework is used in a first effort to infer the effective sensitivities with rigorously determined uncertainties.
The exclusive heating throughout the first operation phase (OP1.1) was a flexible 140 GHz electron cyclotron resonance heating (ECRH) system that allowed plasma scenarios with modulated power which were used for preliminary electron heatwave studies with both power deposition on and off the magnetic axis. This allows for a first comparison of electron heat diffusivities as obtained from heat pulse analysis and power balance analysis.