Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 7: Magnetic Confinement I
P 7.5: Vortrag
Dienstag, 1. März 2016, 12:25–12:40, b305
Influence of the plasma pedestal parameters on ELM mitigation at low collisionality — •Nils Leuthold1,2 and Wolfgang Suttrop1 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany — 2Universität Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
The control of Edge Localized Modes (ELMs) is of great importance for future fusion devices in order to provide longevity of the plasma facing components and a better overall plasma performance.
In recent magnetic perturbation ELM mitigation experiments in ASDEX Upgrade at low pedestal collisionality, the dependence of ELM losses on pedestal parameters is investigated. It is found that the reduction of the stored energy loss associated with ELMs occurs in correlation with a reduction of edge density and edge pedestal pressure induced by the applied magnetic perturbation ("pedestal pump-out"). Significant ELM mitigation occurs at lowest densities, in a region of pedestal n-T parameter space that has not been accessible in ASDEX Upgrade without magnetic perturbations, and which is occupied by type-IV ELMs in DIII-D. The role of magnetic perturbations for ELM mitigation will be discussed in this context and attempts to counteract the confinement loss by increasing neutral beam injection power or pellet injection increases the ELM energy losses.