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- Title
Pre-breakdown phase of coplanar dielectric barrier discharge in helium.
- Authors
Morávek, Tomáš; Čech, Jan; Navrátil, Zdeněk; Ráhel', Jozef
- Abstract
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.
- Subjects
ELECTRIC properties of helium; ELECTRIC discharges; IONIZATION (Atomic physics); PHASE transitions; SURFACE charges
- Publication
European Physical Journal - Applied Physics, 2016, Vol 75, Issue 2, p1
- ISSN
1286-0042
- Publication type
Article
- DOI
10.1051/epjap/2016150538