ing capability, arrangement in the unit, and spherical slope error requirement. The radius of curvature was determined by the above optical analysis. Various possible mirror structures were proposed and compared on the basis of functionality, weight, thermal distortion, and ease in manufacturing. The results were as follows: Substrate CFRP face sheets bonded to an aluminum honeycomb core were selected as the substrate, mainly due to the high specific stiffness and the small thermal distortion. Table IV shows results for different substrates.
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