Figure 4-3 5. Weight and Cost Analysis of an EM Klystron with 48 kW Output Focusing magnets, body radiators and heat pipes account for about 90 percent of the total weight. The cost and weight advantages of the highest power klystron are clear, but the klystron does not yet effectively compete with the amplitron. 4.2.10 CONCLUSIONS The conceptual designs and layouts presented here for both periodic-permanentmagnet and solenoid-type klystrons permit a clear comparison of the two. Despite the lower weight and cost of the PPM structure, the higher power capability of the confined-flow tube gives significant advantages to a tube with an output of 1 6 kW or higher. Figure 4-36 summarizes these results. Electrostatic focusing, while not studied in detail here, gives rf transmission similar to that with PPM focusing.
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