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Proceedings Paper

Cryogenic mechanical design: SPIROU spectrograph
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Paper Abstract

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.

Paper Details

Date Published: 24 September 2012
PDF: 9 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84464E (24 September 2012); doi: 10.1117/12.927442
Show Author Affiliations
Vlad Reshetov, Hertzberg Institute of Astrophysics, National Research Council of Canada (Canada)
Glen Herriot, Hertzberg Institute of Astrophysics, National Research Council of Canada (Canada)
Simon Thibault, Univ. Laval (Canada)
Pierre Désaulniers, Univ. Laval (Canada)
Les Saddlemyer, Hertzberg Institute of Astrophysics, National Research Council of Canada (Canada)
David Loop, Hertzberg Institute of Astrophysics, National Research Council of Canada (Canada)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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