CATHODE-HEATING UNIT FOR AN ELECTRON BEAM GUN Russian patent published in 2021 - IPC H01J1/20 H01J37/06 H01J37/30 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, in particular to instruments and devices for heat treatment of materials and products in vacuum; it can be used in the structure of an electron beam gun for melting refractory metals. A cathode-heating unit for the electron beam gun is fixed in a vacuum-sealed chamber consisting of two chambers: a high-vacuum cathode chamber and a low-vacuum melting chamber separated by a disk vacuum-strong insulator with a main disk cathode of an electronic filament in the center. Coaxially with the main disk cathode, an additional straight-channel cathode is installed in the high-vacuum cathode chamber, which is made in the form of a partitioned heater as a flat spiral heating element consisting of central and peripheral parts. Temperature sensors are installed pointwise and rigidly on surfaces of central and peripheral parts. Central and peripheral parts of the additional straight-channel cathode at points of supply of the filament voltage are attached to independent holders fixed in a case of the high-vacuum cathode chamber.

EFFECT: technical result is an increase in the reliability and an increase in the service life of the cathode-heating unit, an increase in the degree of uniformity of density of the electron beam from the main cathode of the electronic filament.

1 cl, 2 dwg