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11 September 2024 Giant Magellan Telescope primary mirror thermal control system design
Gary Muller, David Ashby, Chris Contaxis, Marianne Cox, Austin Everman, Barbara Fischer, John Ford, Michael Gardiner, Maria Hernandez, Tomas Krasuski, Oliver McIrwin, Trupti Ranka, Thomas Salanski, Jose Soto, Hector Swett, David Zeller
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Proceedings Volume 13094, Ground-based and Airborne Telescopes X; 130942U (2024) https://doi.org/10.1117/12.3020111
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan
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Abstract
The Giant Magellan Telescope (GMT) primary mirror subsystem (M1S) consists of seven 8.4m diameter borosilicate primary mirrors that must be maintained at the ambient nighttime air temperature as it changes throughout the observing night to prevent seeing effects at the mirror surface. Additionally, thermal gradients internal to the mirrors must be minimized to prevent figure errors caused by distortions of the mirror due to the non-zero thermal expansion coefficient of the glass. To address these requirements, the GMT M1S team is fabricating a prototype thermal control system design that consists of a sub-critical refrigeration system utilizing high pressure (~30 to ~60 bar) CO2 (R744) refrigerant. This paper describes the design and status of the M1 Subsystem Thermal Control (M1STC).
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Gary Muller, David Ashby, Chris Contaxis, Marianne Cox, Austin Everman, Barbara Fischer, John Ford, Michael Gardiner, Maria Hernandez, Tomas Krasuski, Oliver McIrwin, Trupti Ranka, Thomas Salanski, Jose Soto, Hector Swett, and David Zeller "Giant Magellan Telescope primary mirror thermal control system design", Proc. SPIE 13094, Ground-based and Airborne Telescopes X, 130942U (11 September 2024); https://doi.org/10.1117/12.3020111
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KEYWORDS
Mirrors
Nozzles
Air temperature
Telescopes
Design
Temperature metrology
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