Off-axis electron gun

Details Off-axis electron gun Off-axis electron gun

H - Electricity

01

J

313/35.31

H01J 29/48 (2006.01) H01J 3/02 (2006.01)

Patent

CA 1183570

TITLE OFF-AXIS ELECTRON GUN INVENTORS Ronald M. Hutcheon ABSTRACT OF THE DISCLOSURE The purpose of the off-axis electron gun is to generate a beam of electrons and to deflect the beam onto the axis of a device which utilizes the beam. The off-axis electron gun includes an arcuate wire electron emitting source, a non-intercepting azimuthally asymmetric elec- trode located at and around the electron source, and an anode plate with a beam exit hole. The non-intercepting electrode has an arcuate slot subtending a predetermined angle at a predetermined radius from the beam axis. The arcuate wire electron source is mounted within the slot in the electrode, but is electrically isolated from the electrode. The elec- trode is asymmetric in shape such that when selected voltages are applied between the wire source, the non-intercepting electrode and the anode, an electric field is produced which directs the electrons towards the axis and simultaneously focusses the beam and deflects it onto the axis.

418445

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