FIELD: electronic equipment. SUBSTANCE: device has anode and coaxial cathode assembly, which is located inside anode and contains secondary electron emission and self electron emission emitters and side flanges which serve as focusing screens. In addition at least one focusing screen is isolated from secondary electron emitter. It also has at least one self electron emission emitter which working end is directed to surface of secondary electron emitter. EFFECT: increased reliability, simplified design, increased mechanical strength. 8 cl, 6 dwg
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