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Proceedings Paper

Predictive thermal control (PTC) technology to enable thermally stable telescopes: first two year status
Author(s): H. Philip Stahl; Thomas E. Brooks
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Paper Abstract

The Predictive Thermal Control Technology (PTCT) development project is a multiyear effort initiated in Fiscal Year (FY) 2017, to mature the Technology Readiness Level (TRL) of critical technologies required to enable ultra-thermallystable ultraviolet/optical/infrared (UVOIR) space telescope primary-mirror assemblies for ultra-high-contrast observations of exoplanets. Key accomplishments of 2017 to 2019 include: creating a high-fidelity STOP model of the AMTD-2 1.5-m Ultra-Low Expansion (ULE®) mirror (manufactured by Harris Corp) by merging 3D X-Ray computed tomography data of the ‘as-built’ mirror and coefficient of thermal expansion (CTE) data maps for each of the 18 core elements; partially validating this model by measuring the mirror’s response to bulk temperature changes and lateral thermal gradients; designed and built (with PTC partner Harris Corp) a 1.5-m enclosure with 26 actively-control thermal zones; and defined specifications for a potential 4-m primary mirror thermal enclosure for the Habitable Exoplanet (HabEx) Imager mission.

Paper Details

Date Published: 9 September 2019
PDF: 12 pages
Proc. SPIE 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II, 111160U (9 September 2019); doi: 10.1117/12.2530117
Show Author Affiliations
H. Philip Stahl, NASA Marshall Space Flight Ctr. (United States)
Thomas E. Brooks, NASA Marshall Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 11116:
Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II
Tony B. Hull; Dae Wook Kim; Pascal Hallibert, Editor(s)

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