Planar He plasma jet: plasma bullets formation, 2D bullets concept and imaging

Applications of dielectric barrier discharge (DBD) based atmospheric pressure plasma jets are often limited by the relatively small area of treatment due to their 1D configuration. This letter describes the first results demonstrating generation of 2D plasma bullets and 2D plasma jets permitting fast treatment of large targets. Imaging of pulsed DBD in He and ionization wave propagation along the dielectric surface show that DBD evolution starts with formation of transient anode glow, and only then continues with development of cathode-directed streamers. The anode glow can propagate as an ionization wave along the dielectric surface outside of the discharge gap. We show that plasma bullets propagation is not limited to 1D geometry (tubes), and can be organized in a form of a planar plasma jet, or other 2D (or even 3D) shapes.