Figure 4-46. Klystron Parameters for 60 kW Beam Above 36 kilowatts the increasing large waveguide losses dominate over the basic klystron efficiency. Maximum efficiency when the klystrons are directly connected to the waveguide is approximately 76. 7 percent. When the klystron output power is divided, the waveguide losses become proportionally less. It is therefore possible to go to a much higher value of peak power per tube before the waveguide losses dominate and result in decreased efficiency. For the 6/1 divider studied, peak efficiency of 78.8 percent occurs at approximately 100 kW per tube. If higher power divider ratios are used the power per tube and maximum efficiency can be expected to increase further.
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