Comparative study of diffuse barrier discharges in neon and helium

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Authors

NAVRÁTIL Zdeněk BRANDENBURG Ronny TRUNEC David BRABLEC Antonín SŤAHEL Pavel WAGNER Hans-Erich KOPECKÝ Zdeněk

Year of publication 2005
Type Article in Periodical
Magazine / Source Plasma Sources Science and Technology
MU Faculty or unit

Faculty of Science

Citation
Web http://stacks.iop.org/ps/15/8
Field Plasma physics
Keywords diffuse dielectric barrier discharges; neon; helium; optical emission spectroscopy
Description Diffuse dielectric barrier discharges in neon and helium at atmospheric pressure were studied. The discharges were generated between two metal electrodes, both covered by an alumina layer and driven by ac voltage of frequency 10 kHz. The discharge gap was 2.2 mm and 5 mm, respectively. The discharges were investigated by electrical measurements and by temporally and spatially resolved optical emission spectroscopy. The experimental results revealed similar discharge behaviour in both gases being considered. Although the discharges were ignited at slightly different electric field strengths, their evolutions were found to be similar. At maximum discharge current the spatial light intensity distribution was characterized by the formation of a cathode fall. A difference was observed in the magnitudes of the current density only. In addition to the regime with a single discharge pulse per voltage half period T/2, a discharge mode with two and more subsequent current pulses per T/2 (also referred to as the pseudoglow discharge regime in the literature) was obtained due to an increase in the voltage amplitude or an admixture of nitrogen.
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