The repeatability of sphere-sphere spark gap columns

This paper describes some results on the repetitive performance of a five stage spark gap column which was used to discharge a five stage PFN Marx generator. The results presented indicate that the PRF capability of the PFN Marx generator is not adversely affected when a spark gap column is used to erect it. The PRFs observed in air, SF₆ and a 50% SF₆/50% He mixture were similar to those which may be expected to be observed in a single, isolated sphere-sphere spark gap with no gas flow. The measurements indicate that SF₆ is more suited to repetitive operation than air, possibly because of its superior convective properties and strong electronegativity. The addition of He to SF₆ appears to enhance the PRF, but for a 50%/50% mixture ratio there is a corresponding reduction in the self-firing voltage of the generator