Berlin 2005 – wissenschaftliches Programm
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P: Plasmaphysik
P 14: Poster: Niedertemperaturplasmen / Plasmatechnologie 6, Diagnostik 4
P 14.2: Poster
Samstag, 5. März 2005, 14:45–16:45, Poster HU
Filaments and their interaction in planar gas-discharge systems — •Hendrik U. Bödeker1, Andreas W. Liehr1,2, and Hans-Georg Purwins1 — 1Institut für Angewandte Physik, Westfälische Wilhelms-Universität Münster, Corrensstr. 2/4, 48149 Münster — 2Freiburger Materialforschungszentrum, Stefan-Meier-Str. 21, 79104 Freiburg
We present new results concerning the formation and the dynamics of self-organized current filaments in a planar DC gas-discharge system with high-ohmic barrier. The structures are observed in nitrogen at pressures of approx. 300 mbar and a discharge gap width of 0.5 mm via the luminance density distribution emitted from the discharge gap. It turns out that the filaments exhibit interesting particle-like properties like generation and annihilation, scattering, and formation of molecules. Processes in which the filaments retain their shape can be analyzed by means of stochastic data analysis. In this way, both intrinsically standing and propagating filaments can be found, corresponding to Brownian and active Brownian motion. In addition, a distance-dependant interaction law between mutually interacting dissipative solitons can be determined, quantitatively explaining the experimentally observed interaction phenomena. The observations are explained in the context of a phenomenological model taking account of the macroscopic properties of the gas-discharge system.