(0. 0508 cm) thickness was chosen for extended analysis, and the temperature data presented here are based upon a uniform waveguide thickness of that value. The efficiency of the microwave beam is directly proportional to the flatness of the waveguide antenna. Distortion due to temperature gradient between upper and lower surfaces of the waveguides degrades this efficiency. In determining the magnitude of the thermal gradient, three candidate waveguide materials were evaluated. These materials were Aluminum, Epoxy/Graphite Laminate and Graphite/Polyimide Laminate. For the amplitron model of Figure 6-27 the analysis results are presented in Figure 6-28. Due to the temperature limitations of the magnet on the amplitron, the constraints in sizing the radiators were: a. Cathode temperature not to exceed 640°C (Point A). b. The temperature at the root of the anode radiator (Point D) not to exceed 350°C. Figure 6-27. Amplitron Thermal Model
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