HIGH-CURRENT-DENSITY CATHODE-RAY TUBE ELECTRON SOURCE.
Quarterly progress rept. no. 7, 1 Dec 65-28 Feb 66,
GENERAL ELECTRIC CO SYRACUSE NY PICKUP TUBE OPERATION
Pagination or Media Count:
Emphasis was placed on developing a cathode configuration which would not exhibit spurious emission from areas on the face of the cathode external to the central 0.010-in. dia emitter proper. The approach taken to resolve this problem consisted of placing a non-emitting cap containing a 0.010-in. dia aperture over the active cathode surface. When carburized molybdenum caps were employed for the purpose, emission from the emitter proper was adversely affected. A slight evolution of gas from all but one of the cathodes tested was detected during operation of the cathodes. This was presumed to be originating at the carburized surface and was held accountable for the decrease in emission. To obtain satisfactory emission when zirconium coated molybdenum or all zirconium caps were used, it was found to be necessary to avoid physical contact as well as a line-of-sight relationship between the zirconium and the matrix portion of the cathodes. An important additional advantage in the use of caps made of zirconium is the excellent getter properties of this material. It is expected that this will make the resultant cathodes appreciably more resistant to adverse environments because of its close proximity to the emitter proper and that spurious emission beyond the design emitting area will be reduced. Author
- Electrooptical and Optoelectronic Devices
- Metallurgy and Metallography