Mainz 2022 – scientific programme
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P: Fachverband Plasmaphysik
P 9: Poster I
P 9.1: Poster
Tuesday, March 29, 2022, 16:00–17:30, P
Wavenumber analysis of the quasi coherent mode in EDA-H-mode discharges — •Joey Kalis1,2, Gregor Birkenmeier1,2, Peter Manz3, Luis Gil4, Michael Griener1, and Ulrich Stroth1,2 — 1Max-Planck-Institut für Plasmaphysik, Garching — 2Physik-Department E28, TUM, Garching — 3Institut für Physik, Universität Greifswald, Greifswald — 4Instituto de Plasmas e Fusão Nuclear, Universidade de Lisboa, Lisboa, Portugal
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 the EDA-H-mode, have been achieved in ASDEX Upgrade. The most prominent characteristic of the EDA-H regime is the appearance of the quasi coherent mode (QCM) at the plasma edge, which may be responsible for the stabilization of the ELMs. For the comparison with theory, it is important to determine the properties of the QCM in detail to identify its underlying driving forces. Due to its high spatial and temporal resolution, the He-beam diagnostic is used to measure different QCM properties. By means of spectral methods and due to a 2D-grid of the He-beam diagnostic, the wavenumber of the QCM in radial and poloidal direction is determined and compared with theoretical predictions.