SMuK 2023 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 11: Poster I
P 11.32: Poster
Mittwoch, 22. März 2023, 14:00–15:30, HSZ EG
Experimental characterization of the quasi-coherent mode in EDA-H and QCE plasmas — •Joey Kalis1,2, Gregor Birkenmeier1,2, Peter Manz3, Ridhesh Goti1,4, Michael Griener1, Elisabeth Wolfrum1, Thomas Eich1, and Ulrich Stroth1,2 — 1Max-Planck-Institut für Plasmaphysik, Garching — 2Physik-Department E28, TUM, Garching — 3Institut für Physik, Universität Greifswald, Greifswald — 4Ludwig-Maximilians-Universität, München
For future reactors based on the tokamak concept, it is necessary to establish high confinement modes without type-I ELMs. In the past years, several natural ELM-free operation scenarios, such as EDA-H-mode or quasi-continuous exhaust (QCE), have been achieved in ASDEX Upgrade. A quasi-coherent mode (QCM) appears in both scenarios at the plasma edge and may be the key feature for the stabilization of ELMs and thus the better confinement. In order to understand and extrapolate a possible EDA-H or QCE scenario at large-scale machines like ITER or DEMO, it is necessary to determine different spectral properties of the QCM. Due to its high spatial and temporal resolution, the He-beam diagnostic and magnetic pick-up coils are used for this purpose. The results include frequency scaling and coherency behaviour, poloidal and radial wavenumber analysis and radial localization as well as a link of the QCM to other higher harmonic modes (HHMs) appearing in the magnetic coils, and are compared with theoretical predictions.