Cryoscope pathfinder: mounting of low temperature optics

Rishi Pahuja; Roger Smith; Jason Fucik; Bob Weber; Peter Zarzaca; Nicholas Earley; Robert Bertz

doi:10.1117/12.3020814

19 July 2024 Cryoscope pathfinder: mounting of low temperature optics

Rishi Pahuja, Roger Smith, Jason Fucik, Bob Weber, Peter Zarzaca, Nicholas Earley, Robert Bertz

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 1309680 (2024) https://doi.org/10.1117/12.3020814
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Cryoscope is a diffraction-limited 26 cm aperture wide-field NIR telescope that uses optics mounted in a cryogenic environment to minimize background radiation from thermal emission. Different mounting strategies were adopted for each of the optical elements: primary mirror, field flatteners, and meniscus corrector lenses. The opto-mechanical design and mounting schemes are to allow stress-free radial expansion of the optics when transitioning to a cryogenic environment from lab ambient temperatures while providing a factor of safety from other sources of stress such as differential pressure and gravity loads. One of the lens elements provides the vacuum seal to the cryostat which along with a stress-free mounting scheme needs to have permeation characteristics no worse than a typical fluorosilicone O-ring to maintain a low pressure (~1 µTorr) vacuum environment that can withstand the harsh -80C environment for deployment at Dome C in the Antarctic. We present the design, analysis, and prototyping results for the lens mounting schemes in Cryoscope that can be scaled by 4x to 1-m class telescopes.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Rishi Pahuja, Roger Smith, Jason Fucik, Bob Weber, Peter Zarzaca, Nicholas Earley, and Robert Bertz "Cryoscope pathfinder: mounting of low temperature optics", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 1309680 (19 July 2024); https://doi.org/10.1117/12.3020814

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