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  4. 2018
  5. VOL 40, NO 5 (2018)
  6. pp. 77-90

GENERALIZED METHODS OF ESTIMATION AND APPROXIMATION OF ANODE PLASMA BOUNDARY FORM AND POSITION IN THE ELECTRODE SYSTEMS OF HIGH VOLTAGE GLOW DISCHARGE ELECTRON SOURCES

I.V. Melnyk, A.V. Pochynok

Èlektron. model. 2018, 40(5):77-90
https://doi.org/10.15407/emodel.40.05.077

ABSTRACT

The paper deals with the methods of determining anode plasma boundary form and position in diode and triode electrode systems of high voltage glow discharge (HVGD) electron sources, based on photographing of discharge gap and on using the method of computer analysing of image brightness. During the simulation of self-consistent electron-ion optic of HVGD electron sources the anode plasma boundary is considered as the source of ions and as the transparent electrode for electrons with potential close to the cathode potential. The brightness map of discharge gap images for diode and triode electrodes systems are presented and singularities of algorithms of analyzing these images are described. For describing of plasma boundary geometry in diode and triode HVGD electrode systems the simple analytical relations have been obtained. For simulation of self-consistent electron-ion optic of HVGD electrode systems the approximate relations were obtained. These relations have also been used for estimation of focal diameter of formed electron beam. The obtained simulation results were compared with experimental data. Disagreement between the theoretical and experimental data for the simulated electrode systems was in the range of 20-25%.

KEYWORDS

high voltage glow discharge, anode plasma, computer analysis of images, images recognizing.

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