Variable profiles of plasma pulses generated from high- dielectric barrier dischargeE. H. Bentefour1, H. M. J. Bastiaens2 and R. M. Hofstra1
1 Nederlands Centrum voor Laser Research (NCLR) B.V. P.O. Box 2662, 7500 CR, Enschede, The Netherlands
2 Group of laser physics and non-linear optics, Faculty of Science & Technology University of Twente - Enschede, The Netherlands
received 12 January 2006; accepted in final form 6 April 2006
published online 3 May 2006
With a specific design of a high-k dielectric barrier discharge, we observed plasma pulses with variable spatial profiles as a consequence of excitation by a high-voltage pulse at different pressures. The dependence of the profile of the generated plasma pulses on the charging voltage and the operating gas (air) pressure is described and the description of their temporal and spatial build-up mechanism is given. We demonstrate that the profile variation of the plasma pulses is caused by the co-existence of dipole switching-based electron emission and field electron emission from triple junctions. Finally, we propose a scheme describing the interaction of these two electron emission mechanisms that leads to the pressure dependence of plasma pulse profile.
52.50.Dg - Plasma sources.
52.80.Tn - Other gas discharges.
© EDP Sciences 2006