Nano-Particle Scandate Cathode for Space Communications Phase 2

We propose an improved cathode based on our novel theory of the role of scandium oxide in enhancing emission in tungsten-impregnated cathodes. Recent results have demonstrated the efficacy of nano-particle scandium oxide, but a detailed theory on the mechanism of operation has been lacking. Our theory explains published data and points to an optimized cathode, which we propose here to build and test. The cathode is the performance-limiting component in high-frequency linear beam amplifiers such as traveling wave tubes and klystrons. The required bandwidth, data rate, number of channels, frequency, and output power are going up. The performance of linear beam amplifiers is acutely limited by current cathode performance. Scandate cathodes offer a way to increase top emission from 10 A/cm2 to at least 50 A/cm2. Phase I proved the feasibility of applying layers on unagglomerated scandium oxide on impregnated cathodes. Phase II will optimize, test, and commercialize the process.

The long life (estimated 100,000 hours) of this cathode will lower system acquisition and maintenance costs in satellites and space probes, as well as terrestrial communications and radars. Higher emission current density will permit higher frequencies, more bandwidth, and more power than current art. There is a shortage in bandwidth and channels in many wireless networks. The scandate cathode provides a way out.

Data transmission and power levels from NASA space probes are inadequate. Fast transmission of high-resolution images during fly-bys is curcial to mission success. Also, upcoming Mars missions require faster data transmission. The time scales of these mission extend into years, even tens of years. The life-limiting component in space is the cathode in a traveling wave tube. The proposed scandate cathode will extend the life, and increase bandwidth and power.

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