München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.97: Poster

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

Non-linear simulations of inter-ELM activity in ASDEX Upgrade — •Andrés Cathey1, Matthias Hoelzl1, Mike Dunne1, Guido Huijsmans2,3, and Sibylle Günter11Max Planck Institute for Plasma Physics, 85748 Garching bei München, Germany — 2CEA, IRFM, 13108 Saint-Paul-Lez-Durance, France — 3Eindhoven University of Technology, Eindhoven, The Netherlands

The presence of naturally-occurring Edge Localized Modes (ELMs) in tokamaks is of concern for future devices like ITER [T Eich, et al, NME 12 2017]. Large type-I ELMs lead to a crash of the edge pressure profile typically every 10−100 milliseconds causing high heat fluxes to plasma facing components. Qualitative and some quantitative agreement between experimentally observed ELM crashes and simulations with the JOREK non-linear 3D magnetohydrodynamic (MHD) code [GTA Huysmans and O Czarny, NF 47 7 2007] have been achieved in many occasions by taking unstable plasma equilibria as a starting point [M Hoelzl, et al, CPP 58 6-8 2018][SJP Pamela, et al, PPCF 58 1 2015]. To obtain a fully realistic description of ELMs and become predictive the entire ELM cycle needs to be simulated [GTA Huijsmans, et al, PoP 22 2 2015]. The inter-ELM phase in ASDEX Upgrade type-I ELMy H-mode is often characterised by the presence of toroidal perturbations of mode number n=[3−5] followed by higher frequency mode activity [AF Mink, et al, PPCF 58 12 2016]. Preliminary simulations show similar behaviour and confirm that these saturated modes cause losses affecting the build-up of the edge pressure gradient prior to the next ELM crash.

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