A parametric design tool for large space telescope sunshields

Details A parametric design tool for large space telescope sunshields A parametric design tool for large space telescope sunshields

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spie.6265e..83p&link_type=abstract

Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter. Edited by Mather, John C.; MacEwen, Howard A.; de Gr

Computer Science

Performance

Scientific paper

We have developed a thermal-optical-mechanical model of a representative sunshield and telescope assembly, appropriate to 10-m class far-infrared large space telescopes such as SAFIR, SPECs, SPIRIT, and CMBPol. The model provides a tool for sensitivity analysis for design parameters, including material properties and structural configuration, provides performance predictions, and has been used to direct technology development for large space telescope structures and materials. The sunshield model incorporates a flight-like design support structure for the five-layer combined sunshield and V-groove radiator, including temperature-dependent thermal, mechanical, and optical properties for the structure and deployed sunshield layers. Heat lift from mechanical cryocoolers is included, in fixed-temperature or power-balance conditions, at arbitrary points on the sunshields and support structure. The model properly accounts the wavelength dependence of radiative transfer between surfaces of widely different temperature, which capacity has not been available from commercial codes for the infrared thermal band (source temperatures 300 K-15 K) until very recently. A simplified model of the zodiacal background to be experienced at the Sun-Earth L2 point is used which, with the wavelength-dependent thermal transfer, improves the fidelity of temperature and heat lift requirements predictions for the coldest sunshield layer and telescope assembly.

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