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For dielectric-vacuum compound insulation systems, the discharges usually occur across the insulator surface with an onset voltage much lower than the breakdown voltage for vacuum gap of the same length. It is no wonder that the surface charge accumulated on the insulator plays an important role in the flashover process in vacuum, especially under DC voltage. In this paper, the off-line observation...
Microwave breakdown phenomenon across dielectric window at the vacuum/dielectric interface limits the transmission of HPM and becomes a bottleneck of HPM technology development. Its avoidance or suppression is a major concern among researchers on HPM sources. Currently, the most effective approach is geometrical modification with the goal of altering the trajectories of electrons. In this paper, periodic...
This paper presents experimentally flashover evolution initiated from cathode to anode via an intensified charge-coupled device camera under the condition of adjusting electric field distribution. These results suggest that a flashover process across insulator surface in vacuum is greatly affected by the local electric field at both cathode and anode triple junctions. Flashover can be initiated at...
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