Simultaneous formation of striations and patterns in surface dielectric barrier discharge
School of Physics, Beijing Institute of Technology - 5 South Zhongguancun Street, Haidian District, Beijing 100081, China
Received: 31 July 2013
Accepted: 9 September 2013
Longitudinal striations and transverse patterns are simultaneously observed in a surface dielectric barrier discharge (DBD) system in argon. Patterned filaments form at sufficient high frequency and moderate voltage. The images of bright filaments and faint regions between them reverse alternately in the two half-cycles. The number of luminous filaments is generally determined by the gas pressure rather than the applied voltage. The striations appear during the plasma expanding above the anode surface in negative half-cycle, in the filaments as well as the regions between them synchronously. The striation spacing does not depend on the voltage, but decreases with the gas pressure in the present configuration. The formations of striation and pattern are two separated processes, and both relate strongly to the accumulated charges on the dielectric surface and the induced surface field.
PACS: 52.35.Mw – Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.) / 52.80.Hc – Glow; corona / 52.70.Kz – Optical (ultraviolet, visible, infrared) measurements
© EPLA, 2013