Abstract
This paper presents an optical diagnostic of the spatial and temporal evolution processes of a pseudo-spark discharge inside a pseudo-spark switch. The influence of the hollow cathode geometry and of the electrode hole diameter is analysed. The discharge evolution is studied using time-resolved high-speed photography and time-resolved spectroscopy. A second luminous phenomenon, appearing inside the hollow cathode after the beginning of the main discharge, is shown and analysed. The velocity and the light front profile of this phenomenon are characteristic of a shock front propagating from the cathode hole to the top of the cathodic chamber, after switching has occurred.
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