maximum power output was 4.2 W/cm2 and this occurred at an output voltage of 0.36 V with the electrodes and cesium reservoir maintained at their optimum values. ACKNOWLEDGEMENTS The facilities were set up and the research activities were conducted at the Thermal Laboratory of the Aero Propulsion Lab (AFWAL/WRDC). We would like to thank Mr D. Brigner for his invaluable contribution in setting up the facility and Ms L. Beljan for word processing assistance in writing this paper. REFERENCES [1] Kroeger, E.W., Bair, V.L. & Morris, J.F. (1978) Diminiode thermionic energy conversion with lanthanum hexaboride electrodes, NASA TM-7887 (NASA Lewis Research Center).
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