peak power density peaked at 2.31. This translated to an optimum collector temperature of 885 ± 10 K. Emitter Temperature Optimization The emitter temperature optimization tests on the Lanthanum Hexaboride diminiode were conducted with constant collector and cesium reservoir temperatures of 885 and 477 K respectively. The emitter temperature was varied from 1450 to 1700 K. The lower limit on this range was based on the fact that there was practially no positive output current below 1400 K and the upper limit was based on the emitter/target material bond strength. Figure 11 represents the output current and output power density characteristics for these tests. As seen in the figure, the highest current densities were obtained with the emitter at 1700 K. On the way towards a negative bias voltage, ignition occurs earlier at a higher emitter temperature indicating that the
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