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P: Plasmaphysik
P 4: Poster I
P 4.33: Poster
Monday, March 17, 2003, 17:45–19:15, Foyer
Investigation of diffuse dielectric barrier discharges in noble gases — •Ronny Brandenburg1, Hans-Erich Wagner1, David Trunec2, and Peter Michel1 — 1Institute of Physics, University of Greifswald, Domstr. 10a, D-17489 Greifswald, Germany — 2Masaryk University, Department of Physical Electronics, Brno, Czech Republic
Within the last few years diffuse barrier discharges (BD) have been intensively investigated. Beside their technological potential, the investigation of conditions to establish a diffuse BD is of fundamental interest. In this contribution the electrical diagnostics and spatio-temporally resolved measurements of the discharge luminosity of diffuse BD in helium and neon at a discharge gap of 2.2 mm and a pressure of about 1 bar are presented. The measured intensity evolutions for different spectral lines shows a cathode directed light, i.e. a cathode fall and a glow-discharge is formed. This is in contrast to the diffuse BD in nitrogen, where the formation of a Townsend-like discharge was observed. The measurements allows conclusions about the fundamental mechanism for diffuse BD generation. Depending on the experimental conditions one or multiple periodic discharge pulses per half-width of the driving voltage appears. With help of the temporally resolved emission spectroscopy it can be confirmed that they are caused by successive breakdowns.