The final design of the cryostat for ELT/METIS

E. Bouzerand; A. M. Glauser; M. Baer; W. Laun; P. Prantl; D. Lesman; B. R. Brandl; L. Odorico

doi:10.1117/12.2627322

29 August 2022 The final design of the cryostat for ELT/METIS

E. Bouzerand, A. M. Glauser, M. Baer, W. Laun, P. Prantl, D. Lesman, B. R. Brandl, L. Odorico

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121842K (2022) https://doi.org/10.1117/12.2627322
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

We present the final design of the cryostat of the Mid-infrared ELT Imager and Spectrograph (METIS) instrument to be operated at ESO’s Extremely Large Telescope (ELT). The cryostat provides the cold optics of the instrument with the required cryo-vacuum environment. The radiation shields of the cryostat are cooled with liquid nitrogen and the cold optics is cooled via pulse-tube coolers down to temperatures between 35 K and 70K. The cold-warm interface is provided with G10 blades that build together with the top part of the cryostat vessel the structural interface to the cold optics, the warm support structure and the warm calibration source. The cryostat development is now complete and the instrument Final Design Review is scheduled for November 2022. We present in this paper the final design status, the key design considerations and the cooling concept.

Citation Download Citation

E. Bouzerand, A. M. Glauser, M. Baer, W. Laun, P. Prantl, D. Lesman, B. R. Brandl, and L. Odorico "The final design of the cryostat for ELT/METIS", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121842K (29 August 2022); https://doi.org/10.1117/12.2627322

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