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This paper presents the computer modeling results, explaining the generation mechanism of periodical electron bunches in a cold cathode metal secondary-emission magnetron gun and describes a scenario of the secondary-emission electron multiplication at the front and droop portions of the anode voltage pulse. An analytical model for analyzing the kinematical characteristics of the formed electron cloud and a self-consistent numerical mathematical model on the basis of the particle-in-cell method for studying the collective electron processes have been developed. The general stages of forming the electron beam in the cold cathode secondary-emission magnetron gun are shown. It is shown that an efficiency of secondary-electron multiplication depends on the shape and parameters of the high-voltage pulse. The obtained results of the computer modeling are in good agreement with the experimental data.Index Terms-Cold metal cathode, computer modeling, crossed-field gun, field emission, secondary-electron emission, tubular electron beam.

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