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22 September 2015 ATLAST ULE mirror segment performance analytical predictions based on thermally induced distortions
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Abstract
The Advanced Technology Large-Aperture Space Telescope (ATLAST) is a concept for a 9.2 m aperture space-borne observatory operating across the UV/Optical/NIR spectra. The primary mirror for ATLAST is a segmented architecture with pico-meter class wavefront stability. Due to its extraordinarily low coefficient of thermal expansion, a leading candidate for the primary mirror substrate is Corning’s ULE® titania-silicate glass. The ATLAST ULE® mirror substrates will be maintained at ‘room temperature’ during on orbit flight operations minimizing the need for compensation of mirror deformation between the manufacturing temperature and the operational temperatures. This approach requires active thermal management to maintain operational temperature while on orbit. Furthermore, the active thermal control must be sufficiently stable to prevent time-varying thermally induced distortions in the mirror substrates. This paper describes a conceptual thermal management system for the ATLAST 9.2 m segmented mirror architecture that maintains the wavefront stability to less than 10 pico-meters/10 minutes RMS. Thermal and finite element models, analytical techniques, accuracies involved in solving the mirror figure errors, and early findings from the thermal and thermal-distortion analyses are presented.
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Michael J. Eisenhower, Lester M. Cohen, Lee D. Feinberg, Gary W. Matthews, Joel A. Nissen, Sang C. Park, and Hume L. Peabody "ATLAST ULE mirror segment performance analytical predictions based on thermally induced distortions", Proc. SPIE 9602, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VII, 96020A (22 September 2015); doi: 10.1117/12.2188008; https://doi.org/10.1117/12.2188008
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