Role of adsorbed charges in breakdown and propagation of surface streamers

Streamer propagation is quite well understood in gas phase but still barely understood onto surfaces, in spite of their key role in many applications of atmospheric pressures discharges. This work aim at comparing the results of three different experimental setups devoted to charges deposition on dielectric surfaces and their consequences on breakdown processes, and influence on streamer propagation in air. Two different geometry of surface dielectric barrier discharges (sDBD) are used for i) studying importance of charges photo-desorption for starting breakdown, ii) making a correlation between fast imaging and charge deposition during propagation. The third reactor aims to constraint streamer into capillary tubes with charges already adsorbed on the wall. The relatively low energy of charges adsorption appears to significantly modify streamer development for DBD in continuous regime.