THERMIONIC EMITTER MATERIALS RESEARCH PROGRAM.
Final technical summary rept. for 1 Oct 63-30 Nov 64,
THERMO ELECTRON ENGINEERING CORP WALTHAM MASS
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The accomplishments during the first and second years of the three-year Thermionic Materials Research Program are summarized. The development of an advanced test vehicle using a collector guard ring and other improvements is described. Collector work function data obtained with a niobium collector and a rhenium collector are described and analyzed. The results are compared with earlier results of molybdenum collectors. Power output data using each of the collector materials were also taken and analyzed. Again a comparison was made between power output from similar emitters opposite rhenium, niobium and molybdenum collectors. It is concluded that no significant difference in optimum converter performance resulted from the difference in collector material. The relationship between collector work function and converter performance is shown to be more complex than previously predicted, and further study is recommended to determine the actual relationship. Earlier work on electron colling and interelectrode radiation values is confirmed using the guarded collector test vehicle. Author