done in this sequence of tests as the optimized values of collector and cesium reservoir temperatures could not be established with any greater resolution. Conclusions The diode test station was set up to test a Lanthanum Hexaboride diminiode by manually biasing the diode with a DC power supply. An initial stage of optimization tests revealed that the optimum cesium reservoir temperature was 485 ±10 K, the optimum collector temperature was 885 ± 10 K and the optimum emitter temperature was 1700 K for maximum thermionic power generation. A second stage of optimization tests were conducted to obtain greater resolution on the optimized temperatures but the instrumentation and the mode of biasing the diode did not allow this. Any more accuracy in arriving at the optimum temperatures can only be obtained with high frequency data points generated with a 20 ms sweep of the bias power supply. The
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