CO2-based refrigeration system for the NFIRAOS optics enclosure

Adam Densmore; Glen Herriot; Joeleff Fitzsimmons; Peter W. G. Byrnes; Ian Welle; Jarod Holma; Megan Tiedje; Jay Burbee; Calvin Winter

doi:10.1117/12.2563141

13 December 2020 CO₂-based refrigeration system for the NFIRAOS optics enclosure

Adam Densmore, Glen Herriot, Joeleff Fitzsimmons, Peter W. G. Byrnes, Ian Welle, Jarod Holma, Megan Tiedje, Jay Burbee, Calvin Winter

Author Affiliations +

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 1144739 (2020) https://doi.org/10.1117/12.2563141
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

Recent changes to the Montreal Protocol have led to the eventual phase-out of hydrofluorocarbon-based refrigerants due to their high global warming potential (GWP). TMT has thus transitioned from R507 (GWP ~ 3900) to CO2 (GWP =1) as the primary observatory supplied refrigerant. Thus, the cooling system for NFIRAOS (TMT’s first light adaptive optics system) was redesigned to work with this high pressure refrigerant. In this paper, we describe the key refrigeration requirements and present the updated design of the NFIRAOS cooling system, including its overall architecture, main components and safety related features. To de-risk aspects of the design and to assess vibration levels of the system (critical for the AO system performance) a prototype CO2 cooling system was built and characterized. Key measurement results are presented.

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Citation Download Citation

Adam Densmore, Glen Herriot, Joeleff Fitzsimmons, Peter W. G. Byrnes, Ian Welle, Jarod Holma, Megan Tiedje, Jay Burbee, and Calvin Winter "CO₂-based refrigeration system for the NFIRAOS optics enclosure", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 1144739 (13 December 2020); https://doi.org/10.1117/12.2563141

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