Düsseldorf 2007 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 21: Grundlegende Probleme, Theorie, Sonstiges

P 21.1: Fachvortrag

Donnerstag, 22. März 2007, 14:35–15:00, 6F

Transition from bright to dark self-organized current filaments in dielectric barrier gas-discharge — •Hans-Georg Purwins, Lars Stollenwerk, Svetlana Gurevich, and Johannes Georg Laven — Institut für Angewandte Physik, Corrensstraße 2-4, 48149 Münster, Deutschland

We report on the first observation of the transition from bright (high current density filaments on a low current density background) to dark current filaments (low current density filaments on a high current density background) and vice versa in a planar ac gas-discharge system with a dielectric barrier. The transition takes place via stripe-like patterns. The observed bifurcation scenario is classified in the framework of Turing-structures and solitary objects, concept that is familiar in the field of nonlinear dynamics and pattern formation. Formally the observations agree with solutions of a two-component reaction-diffusion-system with integral term. The work has been supported by the Deutsche Forschungsgemeinschaft. http://www.uni-muenster.de/Physik.AP/Purwins/Welcome-en.html