5 September 2017 LUVOIR backplane thermal architecture development through the composite CTE sensitivity study
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Abstract
The Large UV/Optical/IR Surveyor (LUVOIR) is one of four 2020 Decadal Survey Missions, a concept for ‘flag-ship’ class space-borne observatory, operating across the multi-wavelength UV/Optical/NIR spectra. An Optical Telescope concept being considered is the segmented primary mirror architecture with composite backplane structure. In order to achieve the high-contrast imaging required to satisfy the primary science goals of this mission would require, roughly, 10 pico-meter wavefront RMS stability over a wavefront control time step of approximately 10 minutes. The LUVOIR primary mirror backplance support structure (PMBSS) 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 PMBSS. This paper describes a systematic approach to developing a thermal architecture of a modular composite section of the mirror support structure heavily guided by the sensitivity studies of the composite Coefficient of Thermal Expansion (CTE) values. Thermal and finite-element models, sensitivity studies against the absolute values and their variations of the composite CTE, the early findings from the thermal and thermaldistortion analyses are presented.
Conference Presentation
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Sang C. Park, Michael J. Eisenhower, Marcel Bluth, Matthew R. Bolcar, Lee D. Feinberg, J. Scott Knight, David C. Redding, "LUVOIR backplane thermal architecture development through the composite CTE sensitivity study", Proc. SPIE 10398, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VIII, 103980D (5 September 2017); doi: 10.1117/12.2274632; http://dx.doi.org/10.1117/12.2274632
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KEYWORDS
Composites

Mirrors

Distortion

Mirror structures

Wavefronts

Finite element methods

Image segmentation

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