Dispenser cathode with emitting surface parallel to ion flow and

Details Dispenser cathode with emitting surface parallel to ion flow and Dispenser cathode with emitting surface parallel to ion flow and

1990-10-15

1991-12-10

O'Shea, Sandra L.

Electric lamp and discharge devices

Electrode and shield structures

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

H01J 128

Patent

active

050721488

ABSTRACT:
A dispenser cathode is designed with an emitting surface including at least one emitting groove characterized by steep opposing walls oriented parallel to the ion flow wherein the walls have a given depth and are separated from each other by a given distance such that bombarding ions which impinge on one wall cause emitting material depleted therefrom to be deposited on the opposite wall. The cathode design, particularly the groove area, width and depth, are selected to optimize its emission current density, operational characteristics, and lifetime. Since the grooved dispenser cathode eliminates the effects of ion bombardment without sacrificing performance, the improved dispenser cathode can be used in thyratons and other gas filled electron tubes to provide an order of magnitude improvement in performance over standard cathodes.

REFERENCES:
patent: 2858470 (1958-10-01), Thurber

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