Low noise electron gun

Details Low noise electron gun Low noise electron gun

H - Electricity

01

J

313/35.33

H01J 29/48 (2006.01) H01J 29/56 (2006.01) H01J 31/38 (2006.01)

Patent

CA 1212983

14 ABSTRACT: Disclosed is an electron gun comprising a cathode, a first apertured anode spaced from said cathode and operated at a potential of between 5 and 30 volts positive with respect to the cathode. The gun further comprises a second apertured anode spaced from the first anode and operating at a potential of between 100 and 400 volts positive with respect to the cathode to produce a lens field in the region between the anodes which focusses the electrons emitted from the cathode at a crossover therebetween. The cross-section of the beam produced by the gun is determined by the size of the aperture in the second anode and the beam current may be varied by chang- ing the voltage on the first anode to thereby move the crossover closer to or further away from the second anode so that a larger or smaller portion, respectively, of the electrons in the beam passes through the aperture. Alternatively, a beam-limiting element, separate from the second anode, may be used.

445670

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