Abstract
Abstract—The process of switching a short vacuum gap by an auxiliary discharge over the dielectric surface was studied via recording of images of discharge plasma radiating in the optical spectral range. A two-channel electro-optical (EO) image-recording system based on an EO converter (EOC) was used. Each channel contained a unit for generating an EOC-photocathode gating pulse, a transposing objective lens, and an EOC, which was joined to a digital CCD (charge-coupled device) camera for reading information from the EOC screen. Based on the analysis of the obtained experimental data, it was suggested that the radiation of a cathode spot and a cathode flame in the UV range play a significant role in the formation of a current channel in the discharge.
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