FIELD: electron-beam devices; electron-beam technology for vacuum welding, acceleration engineering, experimental physics. SUBSTANCE: electron gun has hollow cathode, beam extraction system, focusing system, cylindrical cathode, and emitter cathode with emission channel. Ratio of depth of emission-channel cylindrical cavity facing beam extraction system to its diameter is 0.1-0.25; mentioned cavity is formed by hole in changeable washer mounted in emission channel cylindrical cavity facing hollow cathode built up of two parts; that incorporating cathode cavity is changeable part; end surfaces of hollow-cathode changeable part and emitter cathode facing discharge chamber interior as well as changeable washer are made of tantalum. EFFECT: improved working stability and effectiveness of electron beam extraction, facilitated maintenance of electron gun. 6 dwg
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