Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 1: Helmholtz Graduate School for Plasma Physices I
P 1.1: Fachvortrag
Montag, 29. Februar 2016, 11:00–11:25, b302
Non-linear simulations of ELMs in ASDEX Upgrade — •Alexander Lessig1, Matthias Hoelzl1, François Orain1, Sibylle Guenter1, Marina Becoulet2, Guido Huysmans2, and the ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstrasse 2, 85748 Garching, Germany — 2CEA-IRFM, Cadarache, 13108 Saint-Paul-Lez-Durance, France
Large edge localized modes (ELMs) are a severe concern for the operation of future tokamak devices like ITER or DEMO due to the high transient heat loads induced on divertor targets and wall structures. It is therefore important to study ELMs both theoretically and experimentally in order to obtain a comprehensive understanding of the underlying mechanisms which is necessary for the prediction of ELM properties and the design of ELM mitigation systems.
Using the non-linear MHD code JOREK, we have performed first simulations of full ELM crashes in ASDEX Upgrade, taking into account a large number of toroidal Fourier harmonics. The evolution of the toroidal mode spectrum has been investigated. In particular, we confirm the previously observed non-linear drive of linearly sub-dominant low-n components in the early non-linear phase of the ELM crash. Preliminary comparisons of the simulations with experimental observations regarding heat and particle losses, pedestal evolution and heat deposition patterns are shown. On the long run we aim at code validation as well as an improved understanding of the ELM dynamics and possibly a better characterization of different ELM types.