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P: Fachverband Plasmaphysik

P 22: Niedertemperaturplasmen II

P 22.5: Vortrag

Freitag, 1. März 2013, 11:00–11:15, HS 2

Operation modes in barrier discharges: discharge development and surface charge accumulation — •Marc Bogaczyk and Hans-Erich Wagner — Institut für Physik, Ernst-Moritz-Arndt Universität, Felix-Hausdorffstr. 6, 17489 Greifswald

A new discharge cell configuration was developed which allows the joint investigation of important volume and surface processes of the barrier discharge (BD) operation. In particular, the spatio-temporal and spectrally resolved discharge emission in the volume was studied together with the temporally resolved formation of surface charges on a dielectric BSO crystal. This was possible by the application of the cross-correlation spectroscopy (CCS) and the electro-optic Pockels effect for surface charge measurement, respectively. Surface charges play an important role for the re-ignition of BDs. In pure nitrogen and helium, the diffuse Townsend-like discharge mode was studied. In addition, in helium the glow-like mode could be induced by varying the feeding voltage signal. Small admixtures of nitrogen to helium resulted in the the filamentary discharge operation. Under these conditions, the importance of the so-called memory effect has been verified.

The lateral extent of the discharge spots in the filamentary mode can be approximated by Gaussian profiles for both polarities. The deposited surface charges are in good agreement with the transferred charge of subsequent discharge breakdowns [1].
Supported by “Deutsche Forschungsgemeinschaft, Sonderforschungsbereich SFB TR24”.
J. Phys. D: Appl. Phys. 45 (2012) 465202