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Analytical Method for Electron Gun Calculation

Published online by Cambridge University Press:  28 September 2015

Oleg D. Potapkin
Oleg D. Potapkin*
Affiliation:
Moscow State Technical University of Radioengineering, Electronics & Automatics, Prospect Vernadskogo 78, 119454 Moscow, Russia

Abstract

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The model of thermionic electron gun was developed. The Dirichlet problem for the cylinder (the Wehnelt electrode) restricted by two bottoms, one of them imitates a plane cathode and another imitates the equipotential surface, was solved analytically. It allows to study electron optical properties of the gun and its behaviour in dependence on Wehnelt potential for different cylinder depths. When the focal distance and the crossover size have the minimal value, this mode is called a work one. The crossover size and the beam half-angle values in this mode were approximated and the analytical method for electron gun calculation was developed.

Type
Numerical Methods
Information
Microscopy and Microanalysis , Volume 21 , Supplement S4: Proceedings Ninth International Conference on Charged Particle Optics , June 2015 , pp. 252 - 257
Copyright
Copyright © Microscopy Society of America 2015 

References

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