High-Speed Recording of Vacuum Arc Discharge Images in the Optical Range
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IED PHYSICS
High-Speed Recording of Vacuum Arc Discharge Images in the Optical Range S. G. Davydova, *, A. N. Dolgova, M. A. Karpova, A. V. Korneeva, D. V. Nikishina, A. A. Pshenichniya, and R. Kh. Yakubova a All-Russian
Research Institute of Automatics, Moscow, 127055 Russia *e-mail: [email protected]
Received November 19, 2018; revised November 19, 2018; accepted November 19, 2018
Abstract—Switching of a short vacuum gap with an auxiliary discharge over the surface of a dielectric has been studied via high-speed recording of images of discharge plasma radiating in the optical spectral range. Based on the analysis of experimental data, we surmise that the cathode spot and cathode flame radiation play an important role in the formation of the current channel in the discharge. DOI: 10.1134/S1063780X19110023
INTRODUCTION Despite the widespread use of spark and arc discharges in practice, it cannot be said that there is a full understanding of the mechanism of their formation and existence, and also properties of the key element of these discharges, which may be a cathode spot [1– 5]. Currently an ecton model is proposed and developed [6, 7], which is accepted by many well-known members of the scientific community working toward this direction [3–5]. Broadening and deepening the understanding of the nature of this physical phenomenon as a cathode spot will likely make it possible to use the spark and arc discharges with even greater success for solving various applied problems. However, this implies the continuation of the focused theoretical and experimental studies of this phenomenon. The aim of this work was to study switching of a short vacuum gap using an auxiliary discharge over the surface of a dielectric by high-speed image recording of the discharge plasma radiating in the optical range of the spectrum.
dielectric washer separating the cathode and the ignition electrode while tightly sandwiched between them. The electrodes are fixed in a dielectric frame. The cathode, the ignition electrode and the dielectric washer are coaxial cylinders of the same diameter (6 mm). The cathode and the ignition electrode are structurally composed of current leads and tops that are in direct contact with the dielectric washer. The anode is dome-shaped with a diameter of 6 mm and
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EXPERIMENTAL The studies were carried out on an experimental bench, which allows the full-scale simulation of switching of a short vacuum gap using an auxiliary discharge on the surface of the dielectric. A vacuum diode was used as a discharge device, a photograph of which is shown in Fig. 1. A general scheme of the experiment is shown in Fig. 2. The main elements of the electric discharge system are an anode, a cathode, an ignition electrode, and a 1071
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Fig. 1. Photograph of the vacuum diode: (1) current lead of the cathode, (2) replaceable top of the cathode, (3) dielectric washer, (4) replaceable top of the ignition electrode, (5) current lead of the ignition electrode, (6) anode, (7) current lead of the anode, (8) base of
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