The data in Fig. 5 has been presented to reflect the dependence of output current and output power characteristics on the cesium reservoir temperature. The figure includes a family of current density characteristics where the cesium reservoir temperature was varied from 350 to 550 K with the emitter temperature fixed at 1700 K and the collector temperature fixed at 900 K. As seen in the figure, the current densities increased with increase in cesium reservoir temperature initially, but then decreased above a reservoir temperature of 485 K, in the positive quadrant. The slope of the Boltzman line changed but the overall current and power densities decreased. This was also observable from the power density characteristics generated as a function of the diminiode output voltage. The family of curves in Fig. 5 defines an envelope curve, i.e. a curve that is tangent to all characteristics of the family. These envelope curves shown in Fig. 6 are technically termed the optimized output current or power density characteristics with
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