FIELD: electronic engineering used to obtain electron flows in vacuum. SUBSTANCE: cold cathode uses an emitter element in the form of a hollow cylinder positioned in the cavity of the loading element also made as a hollow cylinder of magneto- striction material with a control winding, whose conductors are placed on the internal and external surfaces of the loading element along its generating line. The emitter and loading elements can contact directly or via an insulating bush. EFFECT: improved design. 4 cl, 5 dwg
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