141700, Moscow region, Dolgoprudny city. Institutski pel: 9, Russia tel. +7-095-4085944 **SSPE "Toriy ", 117393, Moscow, Obruchev stK 52, Russia tel. +7-095-7199393; fax + 7-095-3326466The principddesign of the new heaters is shown on Fig.1. Vacuum electronic heater (VEH) developed as vacuum didde contains thermionic cathode 1 k d anode 2. The anode is cooled by flowing water. The thermionic dispenser cathode heated by tungsten heater 3 emits electron current 4. Kinetic energy of the electrons accelerated by the supply-line voltage'of the anode is transformed to the anode heat. Therefore the flow water in the jacket 2 is heated. Smooth control of output power is provided by variation of working temperature of the dispenser cathode in range of from 700 up to 1000°C. Cathode is located in vacuum volume on the legs 5 hermetically fastened in insulator 6.The cathode of VEH has form of cylinder with outer diameter of 22-24mm and height of not less thin 100mm. Porous tungsten-matrix with thicbess of 0.5-0.7mm is built on the surface of molybdenum cylinder by arc-plasma deposition method. The matrix is impregnated by emission substance with composition of 3Ba0CaO~AIz03 and then the emitting surfase is formed by mechanical treatment to get needed dimensions. During VEH operation current densityon the cathode emission surface isn't higher than lA/cmZ.
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