Accession Number : ADD016209
Title : Thoriated-Tungsten, Split-Ring, Hollow-Cathode Electrode for Discharge Devices.
Descriptive Note : Patent Application, filed 14 Mar 94,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Seibert, Edward J ; Ferguson, Gerald D ; Taylor, Marie E
Report Date : 14 Mar 1994
Pagination or Media Count : 18
Abstract : An electrode assembly for a gas or metal vapor discharge device is disclosed. A pair of electrode assemblies each comprising thoriated tungsten with an alloy composition of tungsten (W) and from about 2% to about 3% of thorium dioxide ThO2 are located at opposite ends of the discharge chamber of the discharge device. The tip of the electrode preferably has four slots equally spaced around its circumference and a groove at its outermost edge. The tip of the electrode provides mechanical flexibility that inhibits the cracking of the thoriated tungsten electrode when it is mounted in the discharge device. Each electrode assembly further comprises a copper spacer, preferably I-shaped in cross-section, brazed against the base of the electrode and against a vacuum flange. The pair of electrode assemblies confines the discharge of the discharge device between the tips of the electrodes and inhibits the arc condition from finding its way to delicate vacuum seals. The electrode assembly provides a clear optical aperture to allow light or laser radiation to exit the discharge cell.
Descriptors : *ELECTRODES, *METAL VAPORS, *THORIUM DIOXIDE, *TUNGSTEN, *PATENT APPLICATIONS, *CATHODES, ALLOYS, APERTURES, ASSEMBLY, CELLS, CHAMBERS, COPPER, CROSS SECTIONS, EDGES, EXITS, FLANGES, LASERS, LIGHT, RADIATION, SLOTS, SPACERS, THORIUM, VACUUM, VACUUM SEALS, GAS DISCHARGES, BRAZING, OPTICAL EQUIPMENT
Subject Categories : Physical Chemistry
Electrical and Electronic Equipment
Metallurgy and Metallography
Distribution Statement : APPROVED FOR PUBLIC RELEASE