Figure 4-22. Klystron Power Summary (Watts) and calculated in Appendix F, is typically 0. 97 or larger in a high-power water- cooled tube. It is highest when the electronic efficiency, beam power, beam perveance and the cavity parameters R/Q and are all large. is proportional to the square root of the electrical conductivity of the copper walls(10) and hence falls with increasing cavity temperature. Since a passively cooled tube requires a heat radiator of area and weight proportional to (temperature) , the body temperature must be as high as mechanical rigidity and magnetic focusing permit; 300°C is about the maximum. Calculated circuit efficiencies and values are shown in Figures 4-23 and u 4-24 for both PPM- and EM- (solenoid) focused tubes. Accounting for losses in the iris output coupling, at 20°C of about 6115 is realistic at 2.45 GHz.
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