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This paper reported the surface and volume resistivity of typical insulators under atmospheric condition and vacuum condition. The measured materials are some kinds of alumina ceramics which have different purity of Al2O3 component. It was confirmed that the surface resistivity for almost all of the insulator materials under vacuum condition was higher than that under atmospheric condition. In addition,...
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...
Surface breakdown of solid insulator in vacuum is initiated by surface charging which is strongly influenced by electron emission properties of the insulator. In this study, photoelectron emission of alumina exited by vacuum ultraviolet light is observed using an electron emission microscope (EEM). As a result, photoelectron emissions of 99.7% purity alumina ceramic named HA997, sapphire (single crystal...
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