24 September 2012 Cryogenic mechanical design: SPIROU spectrograph
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This paper presents an overview of the PDR level mechanical and opto-mechanical design of the cryogenic spectrograph unit of the nIR spectropolarimeter (SPIROU) proposed as a new-generation instrument for CFHT. The design is driven by the need for high thermo-mechanical stability in terms of the radial velocity (RV) of 1 m/s during one night, with the requirement for thermal stability set at 1 mK/24 hours. This paper describes stress-free design of the cryogenic optical mounts, mechanical design of the custom-build cryostat, mechanical design of the optical bench, and thermal design for 1 mK thermal stability. The thermal budget was calculated using lumped-mass model thermal analysis, implemented in Modelica multi-domain modeling language. Discussion of thermal control options to achieve 1 mK thermal stability is included.
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Vlad Reshetov, Vlad Reshetov, Glen Herriot, Glen Herriot, Simon Thibault, Simon Thibault, Pierre Désaulniers, Pierre Désaulniers, Les Saddlemyer, Les Saddlemyer, David Loop, David Loop, } "Cryogenic mechanical design: SPIROU spectrograph", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84464E (24 September 2012); doi: 10.1117/12.927442; https://doi.org/10.1117/12.927442

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