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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...
The light yield (LY) of a wavelength shifter (WLS) fiber embedded in a plastic scintillator plate was studied by the MC simulation using the Mathematica package to find its optimum length and fiber density in the shashlik mode. It was identified whether or not the light absorbed in a fiber has been once reflected at any surface. The partial LY with reflections at upper and lower surfaces as well as...
In this paper, we investigated the vacuum breakdown characteristics for some kinds of Ti electrodes which have different surface conditions. We focus on the influence of machining by the use of different tool bit, such as a cemented carbide tool bit and a cubic Boron Nitride (cBN) tool bit when the electrodes are manufactured with a lathing machine. Moreover we investigated the influence of the chemical...
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...
It is known that the hold-off voltages of vacuum gaps can be improved by the spark conditioning with repetitive electrical breakdowns. At the early stage of spark conditioning process, small pulse currents (not breakdowns) are sometimes observed, and in turn hold-off voltages were improved. To clarify the mechanism of the pulse current occurrence two experiments were carried out.
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