München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.115: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

I-mode power exhaust at ASDEX Upgrade — •Davide Silvagni1, 2, Thomas Eich1, Tim Happel1, Michael Faitsch1, Dirk Nille1, Pierre David1, Bernhard Sieglin1, Ulrich Stroth1, 2, the ASDEX Upgrade team1, and the EUROfusion MST1 team31Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany — 2Physik-Department E28, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany — 3see author list in H. Meyer et al. Nuclear Fusion 57 102014 (2017)

Heat loads on the divertor induced by Edge Localised Modes (ELMs) are a serious threat for large tokamaks operated in H-mode, such as ITER. For this reason natural ELM-free regimes such as the I-mode are of great interest. Although ELM heat loads are avoided in I-mode, power exhaust still remains a crucial challenge to be solved, as the heat flux profile on the divertor is very narrow. In this work, investigations on I-mode heat fluxes onto the ASDEX Upgrade (AUG) divertor are reported. It is shown that the scrape-off layer (SOL) power fall-off length during I-mode is wider than during H-mode, i.e. the power is deposited onto a larger area on the divertor target. However, some I-mode AUG discharges are characterised by intermittent strong heat fluxes reaching the divertor. Their filamentary and toroidally asymmetric nature is highlighted, along with their energy content carried to the divertor. In addition, to understand which SOL quantity is the main player in setting the power width, I-mode electron temperature, density and pressure decay lengths in the SOL are studied.

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