Abstract
The erosion of a cathode consisting of plates of different materials was investigated in a triggered vacuum gap. Scanning electron microscope analysis of the cathode surface was made after various numbers of discharges and the evolution of the erosion was studied. The dimensions of the cathode spot tracks were shown to depend on their locations and the number of discharges. Two effects were observed: first, the ‘fully worked out’ place on the vacuum-metal boundary and second, the increase in dielectric strength of a dielectric shim surface with increasing erosion.
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