Abstract: A dispenser cathode includes a tungsten matrix which is impregnated with an active cathode material and coated with a refractory thin film layer metal material along the surfaces thereto, but not including the electron emissive surface of the matrix, thereby improving a heat transfer efficiency from a heater to the electron emissive surface.

Abstract: A manufacturing method for a dispenser cathode for the electron gun, said cathode comprising a container, an electron emissive material in the container, a porous metal body covering the emissive material, and a sleeve supporting the container. The method includes gas plasma sputtering process to form a porous metal body over the surface of the electron emissive material in the container. The method also may include forming a skirt along the upper edge of the container to strengthen the adherence of the porous metal body to the skirt and to achieve tight sealing of the skirt and porous metal body. The method also can prevent damage of the porous metal body, and can increase the beam currents.