Physics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1540..222m&link_type=abstract
In: Optomechanics and dimensional stability; Proceedings of the Meeting, San Diego, CA, July 25, 26, 1991 (A93-39433 15-74), p.
Physics
Aerospace Environments, Deformation, Extraterrestrial Radiation, Finite Element Method, Radiation Dosage, Radiation Effects, Circular Orbits, Dimensional Stability, Thermal Expansion
Scientific paper
Dose gradients in large mirror substrates due to unequal exposure to the natural space radiation environment have been calculated for two circular orbits: 1200 km altitude/98 deg inclination and 3700 km/30 deg. Dose gradients were translated to density-change profiles based on experimentally determined density changes as a function of dose for fused silica and the low-CTE glass ceramic Zerodur-M. Finite element analysis of deformation due to the radiation-induced density gradient was performed for a 4 m-by-0.5 cm disk representing a mirror faceplate. Displacements of nearly 2500 microns at the outer edge were calculated for a Zerodur faceplate after 10 yr at 3700 km/30 deg. Silica, which is much less sensitive, deformed by only a few angstroms. Reinforcement with a backing having the equivalent stiffness of 5 cm of SiC resulted in a tenfold decrease in the calculated deformation.
Friebele E. J.
Matic P.
Merzbacher C. I.
Ruller J. A.
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