Characterizing gravity sag at cryogenic temperatures

Tomasz M. Lis; Ron Eng; H. Phil Stahl

doi:10.1117/12.3033230

1 October 2024 Characterizing gravity sag at cryogenic temperatures

Tomasz M. Lis, Ron Eng, H. Phil Stahl

Proceedings Volume PC13134, Optical Manufacturing and Testing 2024; PC1313401 (2024) https://doi.org/10.1117/12.3033230
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Abstract

Spaced-based mirrors that operate in cryogenic temperatures have a decreased gravity sag value than their phase maps at 293k. To characterize how the gravity sags changes at cryogenic temperatures a 1.2m aluminum mirror made of 5083 had a horizontal rotation test done for N=3 rotations (0°, 120°, 240°) for multiple temperatures ranging from 293k to 35K.

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Tomasz M. Lis, Ron Eng, and H. Phil Stahl "Characterizing gravity sag at cryogenic temperatures", Proc. SPIE PC13134, Optical Manufacturing and Testing 2024, PC1313401 (1 October 2024); https://doi.org/10.1117/12.3033230

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KEYWORDS

Cryogenics

Aluminum mirrors

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