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The propagation of current and velocity sinusoidal modulation in plane diode using 2D numerical model is studied. The linear regions are obtained when the first harmonics of current and velocity between cathode and anode are increasing proportionally with increasing of harmonic in start points. For two cases of modulation in start points — modulation of current and modulation of velocity — numerical...
The method and code of electron gun calculation in time domain are presented. The Poisson equation in 2D axial region is solved by integral equation method. For modeling in time domain algorithm «step by step» is used. Three meshes — one spherical and two rectangular — are used for potential calculation and equation of motion solving. The consistent scheme of distribution between mesh points of particle...
The method of digital calculation of noise figure for helix TWT using 2d code are presented. The electron beam in helix structure enter was obtained after electron gun calculation with current and velocity modulations on cathode. The zero initial conditions for electron beam in helix enter for interaction calculation was changed by conditions which taken into account current and velocity modulations...
The method of space charge forces calculation in nonstationary electron beams using boundary elements equations are proposed. For 1D task the consistent scheme of distribution between mesh points of particle charges and calculation of electric field acting on particle is considered. This scheme eliminates effect «self-action» of particles but decreases the accuracy of force acting between two particles...
The method of digital calculation of current and velocity disturbances propagation in converging electron streams are presented. The Poisson equation in 2D axial region is solved by integral equation method. For modeling in time domain algorithm «step by step» is used. Three meshes — one spherical and two rectangular — are used for potential calculation and equation of motion solving. The cathode...
The results of using three-dimensional codes for investigation of magnetic field transverse component influence on beam transmission in TWT EOS with next parameters: SWS voltage - 4 kV, beam current - 130 mA, beam focusing - PPM with amplitude value 2700 Gs, tunnel diameter - 1,1 mm are presented.
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