Cryogenic mechanical design: SPIROU spectrograph

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Proceedings titleSPIE - International Society for Optical Engineering. Proceedings
ConferenceGround-Based and Airborne Instrumentation for Astronomy IV, 1 July 2012 through 6 July 2012, Amsterdam
Article number84464E
SubjectMechanical design; Modelica; Multi-domain modeling; Optical Bench; Optical Mounts; Opto-mechanical design; Radial velocity; Spectropolarimeters; Thermal budget; Thermal control; Thermal designs; Thermomechanical stability; Astronomy; Design; Infrared spectrographs; Instruments; Spectrographs; Thermoanalysis; Thermodynamic stability; Cryogenics
AbstractThis 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. © 2012 SPIE.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics (HIA-IHA)
Peer reviewedYes
NPARC number21269516
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Record identifiera8a6d3d1-4caa-44ed-934d-9ee0682f7004
Record created2013-12-12
Record modified2017-04-24
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