• High Structural Stiffness — Beam Pointing Accuracy of 1 min of arc — Slew Rates — High Mass Area Density of Waveguide/Amplitron • Low Thermal Distortion/Thermal Stress — Beam Pointing Accuracy — Relatively Severe Thermal Environment — Moderately High Structural Temperatures — Thermal Gradients Across Structure • Load Paths for Waveguide/Amplitron Subarray Panel Support and Contour Control • Zero Joint Stiction — Linear Response to Changing Structural Load Conditions • Structural Dampening — Rapid Recovery from Dynamic Disturbances Near zero joint stiction can be approximated by excluding bearing-type joints in the structure design. Improved methods to increase structural dampening are design goals, but inherent material dampening may prove to be satisfactory when weighed against other possible alternatives. 7. 3. 3 ANTENNA THERMAL CONTROL 7.3. 3.1 STRUCTURE THERMAL ENVIRONMENT Figure 7-41 shows the configuration and arrangement on the antenna structure of the amplitron with its passive fin radiators. Since the waveguides are insulated from the amplitron radiators by reflective radiation shields, the bulk of the amplitron waste heat is directed toward the antenna primary structure. Distribution of radiated microwave energy, and corresponding waste heat, is tapered according to a gaussian function from the center to the edge of the antenna.
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