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- W3111185251 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." @default.
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- W3111185251 date "2020-12-13" @default.
- W3111185251 modified "2023-09-25" @default.
- W3111185251 title "CO2-based refrigeration system for the NFIRAOS optics enclosure" @default.
- W3111185251 doi "https://doi.org/10.1117/12.2563141" @default.
- W3111185251 hasPublicationYear "2020" @default.
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