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P: Fachverband Plasmaphysik
P 16: Poster Session - Helmholtz Graduate School for Plasma Physics
P 16.1: Poster
Dienstag, 3. März 2015, 16:30–18:30, Foyer Audimax
Comparison of the inter-ELM pedestal profile recovery in plasmas with different main ion species — •Florian M. Laggner1, Gregor Birkenmeier2, Mike G. Dunne2, Rainer Fischer2, Eleonora Viezzer2, Matthias Willensdorfer2, Elisabeth Wolfrum2, Friedrich Aumayr1, and the ASDEX Upgrade Team2 — 1Institute of Applied Physics, TU Wien, Fusion@ÖAW, Wiedner Hauptstr. 8-10, 1040 Vienna, Austria — 2Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany
Since edge localised modes (ELMs) strongly affect the performance of fusion plasmas a deeper understanding of the underlying physics is required to optimise future fusion devices. This contribution investigates the recovery of the edge electron density (ne) and temperature (Te) profiles in between ELMs. A comparison of a hydrogen (H) and a deuterium (D) plasma is presented. In the experiment a match of the collisionality (ν∗) and the normalised plasma pressure (β) was achieved at the pedestal top. For this, roughly a factor of 2 higher heating power as well as a factor of almost 10 higher fuelling rates were necessary in the H plasma. The measured ne edge profiles are much steeper in D than in H, while the Te gradients are similar. The recovery of the pedestal top ne takes place at similar time scales in both plasma species. Te recovers faster after the ELM in H, which is due to the higher heating power, although the energy loss per ELM is larger. The experimental results are presented together with ideal MHD stability analysis and the role of the ELM losses on the plasma stored energy is investigated.