4. 2. 7 TUBE DESIGNS The tube layouts have been developed sufficiently here to provide realistic weight and cost estimates. The cross-section outlines of Figures 4-28(a) and 4-28(b), respectively, show the 5. 57 kW PPM-focused klystron and the 43.18 kW (48 kW) solenoid-focused tube. Figure 4-32 summarizes the principal design parameters, and these data should serve as a basis for a more detailed mechanical design. The dimensions of the drift tunnel scale in proportion to the speed of the beam, or to (beam power) at constant perveance, so that the present outlines can readily be adapted for higher or lower power levels. An advantage of the low perveance and high voltage is the long tube, which separates the cavities well and leaves ample space for heat pipes or cooling channels. At the output cavity the heat pipes and the output waveguide must be brought out without disturbing the magnetic focusing circuit. This section forms a critical part of the mechanical design and should incorporate the best features of existing klystrons adapted for minimum weight, while being straightforward to mass-produce. The full size of waveguide is 11 cm (transverse) by 5 cm (parallel Figure 4-31. Computed Noise Characteristic of the PPM Klystron
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