[Zurück]

F. Laggner, E. Wolfrum, M. Dunne, M. Cavedon, P. Manz, G. Birkenmeier, R. Fischer, E. Viezzer, M. Willensdorfer, F. Aumayr, -. EUROfusion MST1 Team, . ASDEX Upgrade Team:
"The effects of triangularity and main ion species on the inter-ELM profile evolution in ASDEX Upgrade";
Poster: EPS Conference on Plasma Physics, Lisbon/Portugal; 22.06.2015; in: "Proc. 42nd EPS Conference on Plasma Physics, Europhys. Conf. Abstracts", Vol 39E (2015), ISBN: 2-914771-98-3; S. 11471 - 11474.

In high confinement mode (H-mode) plasmas the steep gradients at the plasma edge (called
pedestal) are quasi-periodically destabilised by edge localised modes (ELMs). Since the pedestal
strongly affects the global plasma performance, further understanding of the temporal approach
towards the pedestal stability limit (also known as pedestal recovery) is needed to optimise
plasma scenarios. Previous studies have shown different recovery timescales of the electron
density ne and temperature Te pedestal in between ELM crashes [1]. In these experiments the
ne pedestal recovered first, while the Te pedestal started to recover after the ne pedestal was
established. Gyrokinetic modelling attributed the recovery timescales to the domination of different
turbulent modes [2]. In the phase of the ne recovery trapped electron modes were found in
the pedestal, whereas in the pre-ELM pedestal after the Te recovery, especially on large scales,
microtearing modes and kinetic-ballooning modes were dominant.