Liger at W.M. Keck Observatory: imager structural analysis, fabrication, and characterization plan

James Wiley; Aaron Brown; Renate Kupke; Maren Cosens; Shelley A. Wright; Jérôme Maire; Kenneth Magnone; Evan Kress; Eric Wang; Chris Johnson; James E. Larkin; Michael P. Fitzgerald; Marc Kassis; Tucker Jones

doi:10.1117/12.3018450

18 July 2024 Liger at W.M. Keck Observatory: imager structural analysis, fabrication, and characterization plan

James Wiley, Aaron Brown, Renate Kupke, Maren Cosens, Shelley A. Wright, Jérôme Maire, Kenneth Magnone, Evan Kress, Eric Wang, Chris Johnson, James E. Larkin, Michael P. Fitzgerald, Marc Kassis, Tucker Jones

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130967B (2024) https://doi.org/10.1117/12.3018450
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Liger is an adaptive optics (AO) fed imager and integral field spectrograph (IFS) designed to take advantage of the Keck All-sky Precision Adaptive-optics (KAPA) upgrade to the Keck I telescope. Liger adapts the design of the InfraRed Imaging Spectrograph (IRIS) for the Thirty Meter Telescope (TMT) to Keck by implementing a new imager and re-imaging optics. The performance of the imager is critical as it sequentially feeds the spectrograph and contains essential components such as the pupil wheel, filter wheel, and pupil viewing camera. We present the design and structural analysis of the Liger imager optical assembly including static, modal, and thermal simulations. We present the fabrication as well as the full assembly and characterization plan. The imager will be assembled bench-top in a clean room utilizing a coordinate-measuring machine (CMM) for warm alignment. To ensure optimal performance, the imager will be characterized in a test cryostat before integration with the full Liger instrument. This comprehensive approach to characterization ensures the precision and reliability of the imager, enhancing the observational capabilities of Liger and W.M. Keck Observatory.

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

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James Wiley, Aaron Brown, Renate Kupke, Maren Cosens, Shelley A. Wright, Jérôme Maire, Kenneth Magnone, Evan Kress, Eric Wang, Chris Johnson, James E. Larkin, Michael P. Fitzgerald, Marc Kassis, and Tucker Jones "Liger at W.M. Keck Observatory: imager structural analysis, fabrication, and characterization plan", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130967B (18 July 2024); https://doi.org/10.1117/12.3018450

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