Analysis and experimental study on formation conditions of large-scale barrier-free diffuse atmospheric pressure air plasmas in repetitive pulse mode

摘要: Atmospheric air diffuse plasmas have enormous application potential in various fields of science and technology. Without dielectric barrier, generating large-scale is always a challenging issue. This paper discusses analyses the formation mechanism cold homogenous plasma. It proposed that stable atmospheric open should meet three conditions: high transient power with low average power, excitation E-field locally region, multiple overlapping electron avalanches. Accordingly, an experimental configuration barrier-free designed. Based on runaway theory, duty-ratio, voltage repetitive nanosecond pulse generator chosen as discharge source. Using wire-electrodes small curvature radius, gaps highly non-uniform are structured. Experimental results show volume-scaleable, barrier-free, homogeneous non-thermal been obtained between gap spacing copper-wire electrodes. The area has up to hundreds square centimeters. conditions proved be reasonable feasible.