Method of stabilizing emitted electron beam in field emission el

Details Method of stabilizing emitted electron beam in field emission el Method of stabilizing emitted electron beam in field emission el

1974-10-07

1976-03-23

Lake, Roy

Metal treatment

Stock

Ferrous

148 203, H01J 900

Patent

active

039456986

ABSTRACT:
A stabilizing method is provided wherein a field emission cathode is subject to heat treatment of 2,000.degree.C. to 3,000.degree.C. in a hydrogen gas atmosphere of 1 .times. 10.sup..sup.-9 Torr to 5 .times. 10.sup..sup.-7 Torr and hereinafter an electric field in excess of 10.sup.7 volt/cm is applied to the cathode, whereby the emitted electron beam current from the cathode can be maintained constant for a long time.

REFERENCES:
patent: 2679570 (1954-05-01), Cisne
patent: 2786955 (1957-03-01), Trolan
patent: 2817002 (1957-12-01), Dyke et al.
patent: 2916668 (1959-12-01), Dyke et al.
patent: 3763346 (1973-10-01), Drechsler
patent: 3795837 (1974-03-01), Chang
patent: 3817592 (1974-06-01), Swanson
Dyke et al., "Electrical Stability and Life of the Heated Field Emission Cathode," Journal of Applied Physics, Vol. 31, May 1960, pp. 790-805.

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