Thesis (Ph.D.) - West Ham College of Technology, 1970.
|Contributions||West Ham College of Technology.|
Studies of Electrical Breakdown Processes Across Vacuum Gaps Between Metallic Electrodes L. R. Grisham, A. Von Halle, A. F. Carpe, Guy Rossi, K. R. Gilton, difference that can be sustained in a vacuum between two electrodes without breakdown is a dominant mechanism leading to electrical breakdown in vacuum, then it should be possible to. This paper investigates the roles of different mechanisms constituting the process of electrical breakdown in vacuum. Random variable "vacuum breakdown . Electrical breakdown in vacuum: new experimental and theoretical observations*,** received 8 June ; accepted 7 January M Rabinowitz, Westinghouse Research Laboratories, Pittsburgh, Pennsylvania Electrode geometry effects neglected by previous in vestigators of electrical breakdown & vacuum are shown to be significant in the range of O to I mm gap length, and 0 to 60 kV breakdown Cited by: The mechanisms leading to the electrical breakdown in solids is a complex phenomenon and varies according to the time duration of voltage application. between electrodes in high vacuum at.
the major theories of vacuum breakdown. The factors of practical import which in-fluence insulation of metal electrodes in vacuum are then discussed in some detail. final section oriefly discusses the role of solid dielectrics in vacuum insulation. D D or A'emIIS*S3 p.. POm '1"11 JAO# 04 lHI.. e. Ict. Sputtering of the electrode surface also has to be taken into account in some cases. C Germain and f Rohrbach: High voltage breakdown in vacuum (3) In large scale practical devices such as separators, where ultrahigh vacuum technology and high temperature baking are not used, the surface of the electrodes is not pure metal but is. Gleichauf () [7A-1] presented an article, “Electrical breakdown over insulators in high vacuum.” Abstract [7A-1]: The breakdown voltage of vacuum gaps depends on the elec-trode material, but when the gap is bridged by an insulator it is independent of the electrode material and varies with the kind of insulator. Some indication is found. The process of multiplication of charged particles by the process of collision is very small in the space between the electrodes in vacuum, electron avalanche is not possible. If somehow a gas cloud could be formed in vacuum, the usual kind of breakdown process can take place.
Recent investigations are reviewed of prebreakdown conduction phenomena in vacuum both for steady and for step-function applied voltages. The results of these investigations have led to the formulation of models to explain the initiation of the vacuum discharge by ionization of a vapor medium, the vapor being composed of atoms of one or both of the electrodes. Research presented in this paper is dealing with the determination of static breakdown voltage U s in an argon-filled tube at mbar pressure, for different inter-electrode gaps d with the aim of separating vacuum and gas breakdown processes contribution in electrical breakdown time delay. The U s determination was performed using data on the dynamic breakdown voltage experimental . Currents preceding breakdown have been measured between closely spaced tungsten electrodes in high vacuum. It is found that field emission currents sufficient to evaporate anode metal flow before breakdown. These currents follow the Fowler‐Nordheim equation when field magnification due to surface irregularities on the cathode is taken into. For that purpose, theoretical and experimental investigations of pulse and dc breakdown voltage statistical properties in two-electrode vacuum-insulated diodes were conducted. During the experiment vacuum pressures were 10 −9, 10 −6, 10 −4, 10 −3 bar and inter-electrode gaps were , and mm. Cylindrical copper electrodes.