Typical Electrical Performance of the Radiation Cooled Magnetrons QKH 2244 serial #1 exhibited the performance in Table I when it was operated into a conventional waterload where its microwave power output could be measured. In examining the table the reader is reminded that "efficiency" is defined as the ratio of microwave power output to DC power input to the anode only. "Dissipated Power" includes the power input to the filament which in turn is radiated in the form of heat to the magnetron anode and constitutes an addition to the heat that must be disposed of by the radiating fin. Conclusion The experimentalQKH 2244 magnetron, identified as an unpackaged microwave oven magnetron to which an anodized aluminum radiator has been attached, and whose magnetic field has been supplied by special samarium cobalt magnets, has been evaluated for its ability to directly radiate into space the heat resulting from the inefficiency of the DC to RF conversion process. The design of this tube with respect to the radiation of heat is closely analogous to that of tubes designed for use as the microwave generator in the Solar Power Satellite, and therefore represents a useful step in the evolution of such a tube for space use. Acknowledgements The authors acknowledge the support of the work reported in this paper by the NASA Center for Space Power at Texas A&M University and the Raytheon Company. REFERENCES [1] Brown, W.C. (1981) "Satellite Power System (SPS) Magnetron Tube Assessment Study," NASA Contractor Rep. 3383, Contract NAS8-33157, Feb. [2] Brown, W.C., (1986) "Update on the Solar Power Satellite Transmitter Design." Space Power: Resources, Manufacturing and Development, Vol. 6, pp. 123-135. [3] Twisleton. J.R., (1964) "Twenty-Kilowatt 890 Mc’s Continuous Wave Magnetron," Proc. IEEE, Vol. 3, No. 1, pp. 51-56, Jan. [4] PAPPIS, J. AND BLUM, S., "Properties of Pyrolytic Graphite," Journal of the American Ceramic Society, Vol. 44, No. 12. [5] BROWN, W.C. (1988) "The SPS Transmitter Designed Around the Magnetron Directional Amplifier." Space Power: Resources, Manufacturing and Development. Vol. 7, No. 1, pp. 37-49.
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