THERMIONIC EMITTER MATERIALS RESEARCH PROGRAM.
Annual technical summary rept. no. 2, 1 July 6230 Sep 63,
THERMO ELECTRON CORP WALTHAM MA
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The performance, over a wide range of parameters, of rhenium and iridium as thermionic emitter materials opposite molybdenum collectors, is reported. A study of molybednum-collector work function opposite three different emitter materials is reported, and a correlation against collector-to-reservoir temperature ratio is shown to exist. Emitter work functions are reported, and a correlation against emitter-toreservoir temperature ratio is demonstrated and shown to correspond to Rasors theoretical predictions. A correlation between converter internal voltage loss and the product of cesium pressure and interelectrode spacing is demonstrated, and the relationship between this factor and the optimum performance maps is derived. The usefulness of the data and correlations to the theoretician and the hardware designer are delineated. Author