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Sintered tungsten wire, reservoir cathodes offer high current density operation with very long life time. The diffusion rate can be selected consistent with the current emission density. This presentation will describe the impact of this technology and present the latest test results.
Creek Research, Inc. (CCR) is continuing development of higher current density cathodes using sinterered tungsten wire technology. The goal is cathodes capable of operating at 50 A/cm2 or more for many thousands of hours. The sintered wire technology provides a simple process for fabricating reservoir cathodes with controlled porosity. Control of the porosity allows the designer to tailor the barium...
Sintered tungsten wire cathodes offer the promise of high current density operation with very long life time. The fabrication technique provides controlled porosity for diffusion of barium and oxygen to the emission surface for work function reduction. The diffusion rate can be controlled depending on the current emission density requirement. The barium mixture is contained in a reservoir to provide...
Research is continuing on development of controlled porosity cathodes capable of very long life times. Tungsten wires are sintered to form a material consisting of a uniform pattern of pores to transport barium from a reservoir. The combination of uniform pores and the reservoir results in very uniform current emission from the surface with extremely long life. The barium diffusion rate can be controlled...
Long life, high current density cathodes are required of several THz RF sources. Conventional porous tungsten cathodes are limited to current densities less than 10 A/cm2 for reasonable lifetimes. This presentation describes research to develop long life cathodes with emission current densities approaching or exceeding 100 A/cm2.
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