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P: Fachverband Plasmaphysik
P 17: Poster II
P 17.28: Poster
Freitag, 3. September 2021, 14:00–16:00, P
Investigating impurity transport at the plasma edge in different confinement regimes at ASDEX Upgrade via charge exchange recombination spectroscopy — •Tabea Gleiter1,2, Ralph Dux1, Marco Cavedon1, Rachael McDermott1, and the ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, Garching, Germany — 2Physik-Department E28, Technische Universität München, Garching, Germany
In our recently started project, we investigate the impurity transport at the plasma edge in different confinement regimes at ASDEX Upgrade. In particular, we look at scenarios without or with only small (type-II) edge localized modes (ELMs), such as the I-mode, QCE-mode and EDA-H mode, in comparison to the standard type-I ELMy H-mode. Due to the considerable influence of ELMs on the particle exhaust at the plasma edge, the impurity transport is expected to differ significantly. This is especially of interest since future tokamaks such as ITER and DEMO could benefit from the reduced peak power fluxes at the divertor in 'ELM-free' regimes, but are also reliant on small impurity concentrations in the plasma core. In our experiments, we use active charge exchange recombination spectroscopy (CXRS) to study the temporal and radial evolution of the impurity densities. The detailed approach and first results will be presented.