FIELD: microwave devices. SUBSTANCE: electron gun has anode, focusing electrode, and cathode assembly in the form of ring whose inner surface is coated with secondary-emission material and whose radius increases towards anode. Filamentary thermionic cathode or autocathode is mounted inside ring. Gun may be built up of several rings insulated from each other and arranged along gun axis, their axial length being greater than space between adjacent rings. EFFECT: improved design. 2 cl, 2 dwg
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