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  5. VOL 43, NO 6 (2021)
  6. pp. 76-94

MODELING OF ELECTRODE SYSTEMS OF GAS-DISCHARGE GUNS WITH FOCUSING OF AN ELECTRONIC BEAM IN A MAGNETIC FIELD OF A SHORT LENS

I.V. Melnyk, S.B. Tuhai, V.O. Kyryk, I.S. Shved

Èlektron. model. 2021, 43(6):76-94

https://doi.org/10.15407/emodel.43.06.076

ABSTRACT

In the article, based on the analysis of the basic provisions of the theory of high - voltage glow discharge (HVGD), a method of modeling electrode systems of gas discharge guns with focusing of the electron beam in the field of a short magnetic lens is proposed. To calculate the electric field in the electrode system the finite-difference Poisson equation has been used, which, to simplify its using in the software, is written in the form of an arithmetic-logical expression. Analysis of the guiding of the electron beam in the free drift region was performed with using a system of equations of discrete mathematics based on the Rutherford scattering model. A numerical algorithm for calculating the focus position of the electron beam and its focal diameter is also proposed. To estimate the position of the plasma boundary, a simulation method based on the conversion of the anode plasma volume from a one-dimensional system to the actual spatial geometry of the electrodes was used. In this case, the calculation of the height of the anode plasma in a real electrode system is reduced to the analytical solution of the cubic equation. The calculation of the magnetic field of a short lens was performed using the Yavor model. To implement the proposed methods of modeling HVGD guns, it is proposed to use arithmetic and logical expressions and methods of matrix programming. The obtained results of calculations on the distribution of the electric field in the electrode system, the boundary trajectories of the electron beam in the field of magnetic lense, as well as the distribution of the current density in the focal plane of the hollow electron beam with the ring focus are presented.

KEYWORDS

technological electron sources, high voltage glow discharge, anode plasma, magnetic focusing.

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