Schematic of the electron gun with electrostatic focusing.
Simulation model with magnetic-field's distribution optimized for a 10 A electron beam current.
Simulated electron trajectories for optimized gun parameters. Iel = 10.0 A, Ua = 49.2 kV, Binj = 2.1 kGs.
Dependence of the minimum radial oscillations (dr_min) and of the residual magnetic field on the cathode (B_cath) on the radius of the aperture in the front plate of the magnetic shield for 10 A electron beam.
Dependences of minimum radial beam oscillations on the shift of the cathode with respect to the anode (dr_min_cath), and on the shift of vertical plate of the magnetic shim (dr_min_shim) from their initial positions.
Dependence of amplitude of the electron beam's radial oscillations (dr) on the injection magnetic field, B, for electron beam currents of 1.0 A and 10.0 A.
Simulated dependences of the optimum injection magnetic field (B_opt), of the residual magnetic field on the cathode (B_cath), and of the minimum electron-beam radius (r_inj) on the electron beam current (I_el).
Simulated radial distribution of the cathode's emission current density for Iel = 10.0 A.
Electric field distribution in a cathode-anode gap of the electron gun. Values of the electric field are given in V/m.
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