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Alumina ceramics is widely used as an insulating material for high voltage devices, because of low outgassing, hardness, low dielectric loss and high bulk breakdown voltage. However, there is serious problem to solve that the flashover voltage along the surface in vacuum is lower than that of a vacuum gap at the same length between electrodes. Many intensive researches have been carried out to improve...
Surface charging on insulators in vacuum is recognized as one of the important phenomenon related to the occurrence of vacuum surface discharge events. In order to understand the vacuum discharge phenomenon deeply, it is necessary to investigate the influence of the surface charges on surface discharge events. Therefore the research on surface charges on an insulator is requested to measure the charge...
As we know, before flashover across an insulator surface under high electric field in vacuum, there are charging phenomena occurring on the insulator surface, which significantly affect the developing process of flashover. Based on the secondary electron emission avalanche (SEEA) model, and by using the Monte Carlo method, a two-dimensional analysis of surface charge density on cylindrical and conical...
Most studies on a flashover event in vacuum has revealed that the surface charging on insulator has a great influence on the flashover. However, regarding most studies related to the surface charging, their measurements were carried out after high voltage excitation. In this research, the measurement of 2D surface charge distributions in real time has been carried out in vacuum by Pockels effect....
To clarify the mechanism of surface flashover in vacuum, it is necessary to investigate time dependence of surface charging from voltage application to flashover event. In this research, the real time measurement of 2D surface charge distributions has been carried out in vacuum using a Pockels device. Commercial AC high voltage was applied to some kinds of organic films through a needle electrode...
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