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P: Fachverband Plasmaphysik

P 25: Poster Session- Theory and Modelling

P 25.12: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

The domino effect of unstable one-dimensional bump-on-tail modes as a test for critical numerical scales — Thomas Hayward and •Philipp Lauber — Max-Planck-Institut für Plasmaphysik (IPP), 85748 Garching, DE

The so-called domino effect [BB95], though which more widely spaced modes can overlap as a result of the overlap of closely spaced modes, can lead to a significant increase in the level of mode saturation in the bump-on-tail system. As this effect depends strongly upon the overlap of fine scale structures, which can lead to the establishment of larger scale structures, it is informative to study how the numerical resolution impacts the result of this system close to the overlap threshold. We perform simulations using both particle [Deng] and grid [Kraus] based methods, investigate numerical convergence, and comment on the differences between the two approaches.

[BB95] Berk, H. L. et al. Nuclear Fusion. Vol. 35, No. 12 (1995)

[Deng] Deng, W. and Fu G.-Y. Computer Physics Communications 185, 96-105 (2014)

[Kraus] Kraus, M. PhD thesis, Technische Universität München (2013)