Stuttgart 2012 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 13: Poster: Niedertemperaturplasmsen

P 13.10: Poster

Dienstag, 13. März 2012, 16:30–19:00, Poster.III

Investigation of laterally self-organised structures in DBD using triple correlation functions — Robert Wild and •Lars Stollenwerk — Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, Felix-Hausdorff Str. 6, 17489 Greifswald

The diffuse mode of a dielectric barrier discharge shows under certain conditions (p ≈ 200 hPa, f ≈ 10...200 kHz, d < 1 mm) deviations in the lateral homogeneity of the light emission density. The formation of self-organised structures may then be favoured. In this contribution the transition from a hexagonally patterned discharge to a random distribution of filaments during a voltage reduction is observed and investigated. The patterns are examined by the 2D fourier transformation as well as with triple correlation functions. Following this, a further quantity is introduced that corresponds to the quality of the pattern. It is shown that this quantity bifurcates supercritically during the transition of the two structures. It is furthermore shown that the bifurcation voltage of the angular order does not coincide with the bifurcation voltage of the radial order. The latter generally occurs at a lower voltage.

This work has been funded by the Deutsche Forschungsgemeinschaft, SFB-TRR 24, B14.