MICROWAVE ELECTROVACUUM GENERATOR WITH ELECTRON STREAM REFLECTION Russian patent published in 2013 - IPC H01J25/20 

FIELD: electrical engineering.

SUBSTANCE: microwave electrovacuum generator with electron stream reflection contains a substrate (with a matrix of autoemissive primary electrons sources placed thereon), a control grid with electron transit channels, the first and the second fine structure grids (positioned in a longitudinal direction in the electrons travel direction and forming the cavity resonator capacitative gap and a reflector with a film positioned on its surface and representing the secondary electrons source. The matrix of autoemissive primary electrons sources is divided into several groups of matrices, the side matrices symmetrically positioned on the substrate relative to the central matrix. The electron transit channels within the control grid have a cross section that is less on the side of the first fine structure grid that on the side of the matrix of autoemissive primary electrons sources; the shape of the cross section at the input and at the output of each channel replicates that of an individual matrix. The channels side surfaces are covered with film made of a material with a high secondary electron emission coefficient, representing an additional source of secondary electrons. The cavity resonator capacitative gap is non-uniform in the radial direction so that the capacitative gap magnitude in the centre exceeds the magnitude of gap in the capacitative gap centre.

EFFECT: enhancement of performance coefficient and power output of the generator by way of total electron current density increase.

5 cl, 6 dwg