Space charge effects in a dielectric barrier discharge barrier discharge plasma

摘要

Dielectric barrier discharge (DBD) is the one of well-known discharge types at the atmosphere pressure. The characteristic of this discharge can be expressed in terms of a randomly distributed microdischarge, which is heterogeneously formed cylindrical current filament in a discharge space. However, the microdischarge can be disappeared and becomes glow discharge, which is homogeneously distributed in the discharge space, under certain operating conditions. The gas flow, pressure and input frequency are the main parameters for the transition to glow discharge. When the microdischarge transits to the glow discharge, the self-bias effect in the powered electrode can be detected. The self-bias effect in an AC discharge is the one of well-known phenomena in the glow discharge.