Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2012 · 11 citations · 3 references
EngineeringMaterials ScienceHeat TransferOptoelectronicsThermal AnalysisEquipment DesignTemperature MeasurementThermal DesignThermal StressesThermomechanical AnalysisCryogenic EngineeringCryogenic InstrumentationCryogenic SystemsCryogenic Thermal DesignCryostat DesignThermal ControlThermal StabilityThermo-mechanical Design
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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