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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...
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.
It is said that surface charging on insulator has an influence on vacuum surface discharge. To clarify mechanism of that event, it is necessary to investigate the progress of surface charge distribution on insulator during voltage application. In this research, real-time measurement of surface charge distributions on insulators (Alumina plate and PET film) in vacuum under AC voltage application was...
It has been known that the performance of hold-off voltage of vacuum breakdown for electrodes strongly depends on the surface contamination. Therefore, after manufacturing and cleaning of the electrodes, it is important to handle and keep them under clean condition until the use of them. In order to investigate the influence of keeping methods and terms on the vacuum breakdown characteristics of oxygen-free...
Gases desorption from an electrode by electron irradiation are regarded as one of causes leading to vacuum breakdown. Desorbed gases stimulated by several-keV electrons from oxygen-free copper were analyzed by using a quadrupole mass spectrometer (QMS). In order to measure gases desorbed from the sample electrode with QMS directionally, a cooling shroud was surrounded with the QMS. The cooled shroud...
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