The Laminar Electron Flows in Triode Electron Guns with Field Emission

3D simulation of triode electron gun is performed with regards its structure of multiple-tip field emission cathode. The table of geometrical parameters of electron gun is defined (d(g) (a)/D-a = 1.5-4.0; d(g) (a)/d(g) (c)=10(-4) -10(-2)) as well as the optimal potentials of grid with large scale holes where the electrical field is uniform. Thus the effect of electron lens of grid comes to a minimum and laminar electron flow is formed. The computer modeling of 19-beam electron gun with field emission glassy carbon cathode in magnetic field (N=10(6) cm2) and planar single-beam electron gun with CNT cathode (N=4.10(8) cm(-2)) are carried out.