Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 16: Poster Session - Helmholtz Graduate School for Plasma Physics

P 16.20: Poster

Dienstag, 3. März 2015, 16:30–18:30, Foyer Audimax

Investigation of momentum loss mechanisms in the divertor region of ASDEX Upgrade with EMC3-Eirene — •Dominik Brida^1,2, Tilmann Lunt¹, Marco Wischmeier¹, and the ASDEX Upgrade Team¹ — ¹Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany — ²Physik-Department E28, Technische Universität München, 85747 Garching, Germany

In future fusion devices, such as ITER and DEMO, it will be necessary to prevent direct contact between the hot confined plasma and the vessel wall. This will be achieved by employing divertors, which offer a number of desirable advantages, such as screening of impurities from the core plasma, improved energy confinement (H-mode) and effective pumping of helium ash and hydrogen. However, due to material limits, the power and particle flux as well as the temperature at the target must be reduced to acceptable levels. This can be attained by operating the divertor in a (partially) detached regime, which requires considerable volumetric energy and momentum losses in the divertor region. Previous studies identified ion-neutral friction as the principal momentum loss factor. For this contribution the fluid code EMC3-Eirene was applied to simulate ASDEX Upgrade discharges with increasing plasma densities and investigate the role of different momentum loss mechanisms by switching on and off respective terms in the simulation. Interestingly, even without the charge-exchange collisions a strong momentum loss is observed in the simulation.