Electron-beam cathode having a uniform emission pattern

Details Electron-beam cathode having a uniform emission pattern Electron-beam cathode having a uniform emission pattern

1980-04-30

1982-04-13

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

Point source cathodes

29 2517, 313346R, 427 77, 252520, H01J 116, H01J 1910

Patent

active

043249990

ABSTRACT:
Disclosed is an electron-beam cathode which emits electrons in a cone-shaped pattern whose electron density is substantially uniform throughout the cone. The cathode is comprised of a needle-shaped piece of single crystal tungsten having dopant atoms of zirconium and oxygen in the bulk thereof, and having only a single (100) surface on the needle's tip. This cathode is formed by the steps providing a needle-shaped piece of single crystal tungsten having dopant atoms of zirconium and oxygen in the bulk thereof, and having a plurality of ring-shaped (100) surfaces on the needle's tip; and subsequently transforming those surfaces into diagonally oriented planar surfaces by heating the needle in an atmosphere of oxygen to diffuse tungsten atoms from the needle's tip to its sides.

REFERENCES:
patent: 3817592 (1974-06-01), Swanson
patent: 3947716 (1976-03-01), Fraser, Jr. et al.

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