Beam and Sector Modes of Electron Fluxes in Cylindrical Magnetic Field of Magnetron Gun

Authors A.S. Mazmanishvili1 , N.G. Reshetnyak1, O.A. Shovkoplyas2

1National Science Center "Kharkiv Institute of Physics and Technology", 1, Academic St., 61108 Kharkiv, Ukraine

2Sumy State University, 2, Rymsky-Korsakov St., 40007 Sumy, Ukraine

Issue Volume 12, Year 2020, Number 3
Dates Received 18 September 2019; revised manuscript received 15 June 2020; published online 25 June 2020
Citation A.S. Mazmanishvili, N.G. Reshetnyak, O.A. Shovkoplyas, J. Nano- Electron. Phys. 12 No 3, 03001 (2020)
PACS Number(s) 29.27.Fh
Keywords Magnetron gun, Secondary emission cathode, Magnetic field distribution, Electron beam collimation, Mathematical modeling (7) , Histogram.

The results of the study on the formation of a radial electron beam by a magnetron gun with a secondary emission cathode are presented. The aim of the work was to create a mathematical model of the formation of a radial electron beam with energy of tens of keV in a magnetic field of a solenoid, to study the dependence of the beam current characteristics on the amplitude and distribution of the magnetic field along the axis of the system, the collimation of electronic fluxes and to study the possibility of irradiation of the surface of the tubular products. In the work, on the basis of the Hamiltonian formalism of electron motion in a magnetic field, a software tool has been synthesized that allows performing numerical simulations of the dynamics of tubular electron fluxes in a falling magnetic field of a solenoid. An algorithm is constructed for converting an array of magnetic field values along the axis of particle transport into an analytic differentiable function, which, based on an array of experimental data on the axis, made it possible to restore the amplitude of the magnetic field and its derivative as analytic functions of the longitudinal coordinate. The results of numerical simulations of the motion of a tubular electron flux are presented. The formation of the electron flux distribution during transport in a solenoid falling magnetic field is studied. Experimental data on sectoral and multi-beam collimation of an electron beam and registration of particle flux at metal targets in a gun chamber are also given. The possibility of regulating the beam diameter by variation of a magnetic field is shown. Based on the results obtained, the possibility of irradiating the outer surfaces of cylindrical samples at different distances from the cut of the anode is shown. The results of numerical simulations and experimental data on the motion and collimation of a tubular electron flux are compared.

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