SMuK 2023 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 6: Magnetic Confinement II/HEPP III
P 6.4: Vortrag
Dienstag, 21. März 2023, 12:20–12:35, CHE/0091
Experimental Evidence for the Drift Wave Nature of the Weakly Coherent Mode — •Manuel Herschel1,2, Tim Happel1, Daniel Wendler1,3, Michael Griener1, Joey Kalis1,3, Peter Manz4, Ulrich Stroth1,3, and The ASDEX Upgrade Team5 — 1MPI für Plasmaphysik, Garching — 2Universität Ulm — 3Physik Department E28, TUM, Garching — 4Institut für Physik, Universität Greifswald — 5See Author list of "Stroth, U. et al., Nuclear Fusion 62 (2022) 042006"
Improved confinement regimes will play a key role in the operation of future fusion power plants. I-mode, one of these regimes, combines good energy confinement with the absence of ELMs. It features a characteristic edge transport barrier in energy but not in density. This selective transport reduction is not understood. An edge density fluctuation called the Weakly Coherent Mode (WCM) is often brought forward as a possible explanation
Measurements obtained from Doppler reflectrometry and thermal helium beam spectroscopy at ASDEX Upgrade (AUG) are combined to analyze the WCM in unprecedented detail. A phase velocity of the WCM consistent with the dispersion relation of a near ideal drift wave is found for the first time at AUG.
This marks a novel experimental verification of a specific mechanism for the WCM and sheds new light on a long-standing debate on the underlying physics.