Thermionic cathode having an embedded grid, process for its fabr

Details Thermionic cathode having an embedded grid, process for its fabr Thermionic cathode having an embedded grid, process for its fabr

1978-05-09

1981-11-24

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

Foraminous electrodes or shields

29 2514, 29 2517, 313299, 313338, 313447, 313452, H01J 146, H01J 1704, H01J 1938, H01J 2110

Patent

active

043027024

ABSTRACT:
The invention relates to metal oxide activated porous tungsten cathodes and methods of their manufacture. A cathode 1 of porous tungsten activated by metal oxides is mounted on a housing 2 which has a heating filament 3. On the outer face of the cathode there is a pattern or grid of pure tungsten (preferably formed by a chemical vapor deposition of WCl.sub.6 or WF.sub.6) of crystalline material the outer face of which has an orientation in the (100) or (110) plane and is parallel to the surface of the cathode. The invention will find particular use in the cathode guns of high frequency tubes such as traveling wave tubes and klystrons.

REFERENCES:
patent: 3154711 (1964-10-01), Beggs
patent: 3638062 (1972-01-01), Beggs
patent: 3818260 (1974-06-01), Elfe, Jr. et al.
patent: 3843902 (1974-10-01), Miram et al.
patent: 3967150 (1976-06-01), Lien et al.
patent: 4096406 (1978-06-01), Miram et al.

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