Bremen 2017 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 14: Plasma Wall Interaction
P 14.3: Poster
Dienstag, 14. März 2017, 16:30–18:30, HS Foyer
Investigation of Plasma Detachment Characteristics and Dynamics at the ASDEX Upgrade Tokamak — •Amazigh Zerzour, Matthias Bernert, Daniel Carralero, Ulrich Stroth, and The ASDEX Upgrade Team — Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany
Future tokamaks like ITER and DEMO will experience heat fluxes of about 300 MWm−2 onto the divertor if not mitigated. This poses a major threat to the device as material heat load limits are expected to be in the range of 5 MWm−2. An efficient solution to this is the detachment of the plasma from the divertor, a state in which the plasma temperature drops to values of several eV at the divertor, allowing for recombination and charge exchange processes in the divertor volume. However, future tokamaks are foreseen to operate in the High Confinement Mode (H-Mode) which features cyclic instabilities, so-called Edge Localized Modes (ELMs), periodically driving high heat fluxes onto the divertor. Heat loads during ELMs can last long enough to effectively reattach the plasma to the divertor. We therefore investigate H-mode plasmas at various densities and power fluxes to characterize the detachment cycles in between ELMs. Understanding the characteristics and dynamics of the detachment regimes, not only in between ELMs, and their influence on the bulk plasma is of crucial importance for the successful operation of future tokamaks.