Vapor coated emissive cathode

Details Vapor coated emissive cathode Vapor coated emissive cathode

1977-02-04

1979-05-15

Dixon, Harold A.

Radiant energy

Ionic separation or analysis

250296, 250298, 250425, 250427, B01D 5944, H01J 2700

Patent

active

041550080

ABSTRACT:
A long life, high emission electron source for a plasma environment. The plasma environment is made up of corrosive particles having a lower work function than the exposed material of the electron source. The electron source is operated at an elevated temperature not only to provide free electrons but also to establish and maintain a thin partial monolayer coating of the source's emissive surface with plasma particles in an equilibrium between condensation and evaporation. The equilibrium coating increases the emissivity of the surface without permitting substantial corrosion of the surface or structure from the particles of the plasma environment. The cooler regions of the electron source are shielded from the plasma particles to prevent a build-up of corrosive particles.

REFERENCES:
patent: 3610985 (1971-10-01), Fleming

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