INJECTOR OF ELECTRONS WITH EXTRACTION OF BEAM INTO GASEOUS MEDIUM Russian patent published in 1995 - IPC

FIELD: electrical engineering. SUBSTANCE: injector of electrons includes electron gun 2 with thermal cathode 3 assembled in ceramic insulator 4 on anode flange 5. Getter pump 21 is located between anode and working chamber 22 and has screens coated with titanium sponge 23 and tubular system 24 for circulation of cooling agent. Channel of thermal cathode switches on after cutting in of pumping system 30 and achievement of working vacuum in electron gun 2. After setting of cathode to predetermined emission condition magnetic solenoid 27 is turned on and a accelerating voltage is fed from controlled source 25 to gap thermal cathode 3 - anode 6. Electron beam is formed in accelerating gap and passes through system of holes in electrodes into working chamber 22 where it interacts with gaseous medium. If extreme electrodes 11 and 12 of magneto-discharge pump are grounded and negative potential is fed to electrode 13 then effect of ion trap emerges in cylindrical space 10 of anode. Positive ions formed in zone of beam leak to central electrode 13 being under negative potential. Combination of magneto-discharge pump built-in into hollow anode and getter pump 21 functioning as beam guide ensures approximately 2-fold pressure difference between electron gun 2 and working chamber 22. EFFECT: reduced mass and size parameters of injector of electrons. 2 cl, 2 dwg