The reliability and service life of accelerating installations are substantially determined by the lifetime of electron sources. The accelerator under consideration comprises, as an electron source, a magnetron gun with a channel-free cold secondary-emission cathode in crossedˇelds [1,2]. In the present work the data of electron beam parameters obtained in the accelerator based on the magnetron gun with a secondary-emission cathode are given and the possibilities of its use for secondary purposes are suggested.
DESCRIPTION OF THE ACCELERATOR AND RESEARCH TECHNIQUESThe electron accelerator (Fig. 1) comprises the following main units: high-voltage pulse generator 1; electron source 2 with secondary-emission cathode and anode placed in the vacuum chamber; solenoid 5 creating a longitudinal magneticˇeld; target device with eightsegment Faraday cup 3; computer-aided measuring system 4 for measurements of electron beam parameters.
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.
The results of the study on the formation of electron beams by the magnetron gun at various configurations of the magnetic field in the beam transport channel are presented. A technique for modeling the processes of formation of electron flows and control of the distribution of beams by collimation is presented. Numerical simulation of the dynamics of electron beams in the magnetic field of the gun for its various configurations has been carried out. Experimental data on the transportation and collimation of electron beams are presented. The possibility of stable formation of an electron beam in the axial direction during its transportation is shown. Imprints of the collimated electron beam were obtained on metal targets. The possibility of controlling the beam diameter by varying the magnetic field is shown. Comparison of the results of numerical modeling and experimental data on the motion and collimation of the tubular electron flow is carried out.
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