Abstract
We have studied the charging of insulator with double ribs or a recess by using a two dimensional Monte-Carlo simulation method based on the secondary emission electron avalanche (SEEA) mechanism. The electric field distribution on cathode around a triple junction was analyzed taking the charge accumulation into account. Results were compared to those obtained for a simple cylindrical insulator and also insulators with a single rib. Flashover tests were also conducted by using dc voltage. The results of these investigations imply that the number of ribs is not important, and that the recess on insulator is not so effective for the insulation of bridged vacuum gaps.
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