Dispenser cathode, particularly a metal capillary cathode

Details Dispenser cathode, particularly a metal capillary cathode Dispenser cathode, particularly a metal capillary cathode

1979-08-20

1982-01-12

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

313337, 313346DC, H01J 114, H01J 1906, H01K 104

Patent

active

043107753

ABSTRACT:
In an exemplary embodiment, a metal capillary cathode for electric discharge vessels with an emission substance carrier disk porous on its front face and comprised of metal melting at a high temperature is constructed to prevent lateral emission of electrons (interfering emission). To this end, the disclosure provides that the emission substance carrier disk has a nonporous outer casing surface with a higher electron work function than the outer, active surface of the emission substance carrier disk. Such a dispenser cathode is employed as a metal capillary cathode in traveling wave tubes.

REFERENCES:
patent: 2173208 (1939-09-01), Lecorguillier
patent: 2640950 (1953-06-01), Cook
patent: 2673277 (1954-03-01), Lemmens et al.
patent: 2972078 (1961-02-01), Levi
patent: 3159461 (1964-12-01), MacNair
patent: 3558966 (1971-01-01), Hill
patent: 4019081 (1977-04-01), Buxbaum et al.

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