ELECTRON GUN FOR MICROWAVE DEVICE Russian patent published in 2009 - IPC H01J23/06 

FIELD: physics.

SUBSTANCE: invention relates to vacuum microwave devices, particularly to electron guns, and can be used in pulsed travelling-wave tubes or klystrons with low-voltage grid control of beam current. The electron gun contains a thoria cathode with annular emitting surface 1, shadow 2 and control 3 grids with discs 4 and 5 in their centres, anode 6 with an anode grid 7 with disc 8 in its centre, additional emitting surface 9 with a flat or spherical shape. Discs in the centres of the grids have openings 10, 11 and 12.

EFFECT: increased maximum power of the device, efficiency, reliability and durability due to increased beam perveance, improved focusing and current flow coefficient, achieved due to use of an additional emitting surface in the centre of the cathode, use of a disc in centre the anode grid and openings for transit of electrons to discs of the shadow, control and anode grids.

3 cl, 1 tbl, 12 dwg