Surface charge measurements on different dielectrics in diffuse and filamentary barrier discharges

摘要: Previously, we reported on the measurement of surface charges during operation barrier discharges (BDs) using electro-optic Pockels effect a bismuth silicon oxide (BSO) crystal. With present work, next milestone is achieved by making this powerful method accessible to various dielectrics which are typically used in BD configurations. The dynamics and spatial distribution positive negative were determined optically transparent borosilicate glass, mono-crystalline alumina magnesia, respectively, covering BSO By variation nitrogen admixture helium pressure between , both diffuse glow-like self-stabilized discharge filaments operated inside gas gap . characteristics and, especially, influence different its development studied charge diagnostics, electrical measurements ICCD camera imaging. Regarding BD, breakdown voltage changes significantly cathodic dielectric, due effective secondary electron emission (SEE) coefficients. These material-specific SEE yields estimated Townsend's criterion combination with analytical calculations ionization coefficient air impurities. Moreover, importance memory for self-stabilization was quantified recalculated spatio-temporal behavior voltage.