Hollow cathode

Details Hollow cathode Hollow cathode

1985-04-30

1986-12-30

Levy, Stewart J.

Electric lamp and discharge devices

With magnetic device

313103CM, 313339, 313346R, H01J 4308

Patent

active

046331298

ABSTRACT:
A long life high current density hollow cathode electron beam source for use in various E-beam apparatus which uses an ionizable gas within the hollow cathode. Bombardment of an electron emissive surface within the hollow cathode by energetic gas ions causes electrons to be emitted by secondary emission rather than thermionic emission effects. Once initialized by an external ionization voltage the device is essentially self sustaining and operates near room temperature, rather than at thermionic emission temperatures, and with reduced voltages.

REFERENCES:
patent: 3320475 (1967-05-01), Boring
patent: 3414702 (1968-12-01), Stauffer
patent: 3515932 (1970-06-01), King
patent: 4298817 (1981-11-01), Carette et al.
patent: 4325000 (1982-04-01), Wolfe et al.
patent: 4377773 (1983-03-01), Hershcovitch et al.

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