The Influence of Jumper Height of the Shadow Grid on the Efective Emission Area of the Dispenser Cathode in Cathode-Grid Assembly of High-Power Pulsed TWT

Abstract

The results of experimental studies of the influence of the jumper height of the shadow grid structure on the effective emission area of the impregnated cathode in cathode-grid assembly in the C-band pulsed TWT are presented. It is shown that the field screening of the impregnated cathode surface along the jumpers of the shadow grid increases significantly with the elevation of the grid structure above the cathode surface. In order to maintain the working value of the cathode it is necessary to increase its temperature, which significantly reduces the lifetime of the cathode and decreases its reliability and durability.