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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...
Prior to flasshover across solid dielectrics under steady-state high voltage excitation in vacuum, there are charging phenomena occurring on insulator surface, which significantly affect the developing process of flashover. In this paper, based on the secondary electron emission avalanche model (SEEA) and Monte Carlo simulation method, the theoretical analysis of surface charge density on insulation...
The charge accumulation on the surface of dielectric materials is a long-term academic research focus. As part of an effort to understand the origins of this behavior, surface charge distribution on silicon rubber under DC high voltage before and after flashover in atmosphere was measured by an electrostatic voltmeter with a vibrating Kelvin probe. Three types of electrode systems were employed in...
Surface breakdown of dielectric window seriously limits the generation and transmission of high-power microwave (HPM), which blocks the development of microwave technology. Some research discusses that periodic rectangular grooves on the dielectric window perpendicular to microwave electric field can improve the threshold of breakdown greatly in a certain power range. For further understanding the...
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