Eur. Phys. J. Appl. Phys.
Volume 75, Number 2, August 2016
6th Central European Symposium on Plasma Chemistry (CESPC-6)
|Number of page(s)||5|
|Section||Plasma, Discharges and Processes|
|Published online||08 August 2016|
Pre-breakdown phase of coplanar dielectric barrier discharge in helium*
Masaryk University, CEPLANT – R&D Center for Low-Cost Plasma and Nanotechnology Surface Modification, Kotlářská 2, 61137
Brno, Czech Republic
a e-mail: email@example.com
Revised: 25 January 2016
Accepted: 18 March 2016
Published online: 8 August 2016
Coplanar barrier discharge in single-pair electrode configuration was used to study the formation of helium diffuse mode discharge. Transition from Townsend avalanching to the cathode and anode directed ionization waves was documented by high-speed camera imaging. When alumina dielectric barrier was coated by a thin layer of high permittivity coating (εr = 120–140), a new partial discharge preceding the Townsend avalanching phase was clearly visible. We suggest that this new pre-Townsend breakdown event is analogous to the known backward discharge of surface barrier discharge. Low magnitude of local electric field strength during the pre-Townsend breakdown reduces the number of competing electron collision excitation processes. This opens a new opportunity for studying optical emission from surface charge recombination processes.
© EDP Sciences, 2016
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