DYNAMICS OF AN ELECTRON BEAM FORMED BY MAGNETRON GUN WITH THE SECONDARY EMISSION CATHODE IN THE DECLINING MAGNETIC FIELD OF SOLENOID: EXPERIMENT AND SIMULATION
DOI:
https://doi.org/10.20998/2079-0023.2021.02.05Keywords:
magnetron gun, secondary-emission cathode, electron beam, mathematical design, distribution of magnetic-fieldAbstract
The article presents the results of research and calculations on the formation of a radial electron beam by a magnetron gun with a secondary emission cathode in the electron energy range 35...65 keV and measuring its parameters during transportation in the total decreasing magnetic field of the
solenoid and the stray field of permanent magnets. The beam was transported in a system consisting of copper rings with an inner diameter of 66 mm,
located at a distance of 85 mm from the exit of the magnetron gun. The dependence of the beam current on the amplitude and gradient of the field
decay has been studied. The studies carried out have shown the possibility of stable formation of a radial electron beam with an energy of tens of keV
in the decreasing magnetic field of the solenoid. By optimizing the distribution of the magnetic field (created by the solenoid and ring magnets) and its
decay gradient, it is possible to achieve an increase in the incident of electrons on one ring (up to ~72% of the beam current). On the basis of the
mathematical model of the movement of the electron flow, a software tool has been synthesized that makes it possible to obtain and interpret the
characteristics of the resulting flows. The obtained numerical dependences are in satisfactory agreement with the experimental results for a magnetic
field with a large decay gradient. Various configurations of the magnetic field are considered. Solutions to the direct problem of modeling electron
trajectories for given initial conditions and parameters are obtained. Various configurations of the magnetic field are considered. It is shown that for
the selected initial conditions for the electron beam and the distributions of the longitudinal magnetic field along the axis of the gun and the transport
channel, the electron flux falls on a vertical section, the length of which is on the order of a millimeter. Thus, by changing the amplitude and
distribution of the magnetic field, it is possible to control the current in the radial direction along the length of the pipe, and, therefore, the place of the
electron irradiation.
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