Vacuum electrical strength increase resulting from suppression of micropore processes

Processes in pores of electrode surfaces are responsible for currents of poroelectron emission (pre-breakdown currents), other kinds of vacuum insulation violation and electrode erosion at low values of electrical field strength. The experimental data obtained have permitted suggestion of a construction of porous electrode surface where these processes are to some extent suppressed. The results on comparison of vacuum insulation electrical strength for the electrodes above as well as for those manufactured along the lines of widely used technologies completed with electropolishing are presented. The current in vacuum gaps at durable voltage application was chosen as the strength criterium. Better results were obtained for the electrodes with specially prepared porous surface subjected to no post-manufacturing treatment