The MICADO first light imager for the ELT: USM big test cryostat: design, performances, and test activities

A. Monna; F. Lang; L. Spallek; L. Neumeier; J. Lange; F. Grupp; A. Emslander; F. Biondi; R. Bender

doi:10.1117/12.3019019

18 July 2024 The MICADO first light imager for the ELT: USM big test cryostat: design, performances, and test activities

A. Monna, F. Lang, L. Spallek, L. Neumeier, J. Lange, F. Grupp, A. Emslander, F. Biondi, R. Bender

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130965G (2024) https://doi.org/10.1117/12.3019019
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The Universitäts-Sternwarte M¨unchen (USM) was responsible for the procurement of a big Liquid Nitrogen (LN2) continuous-flow test cryostat, equipped with a 1600 mm diameter optical bench. This cryostat is planned to perform cryogenic tests of the two large cryogenic mechanisms of the MICADO instrument, the Main Selection Mechanism (MSM) and Central Wheel Mechanism (CWM), and of some of the instrument cold optics (COI) modules. The Big Test Cryostat was delivered at the end of 2021, and is currently installed at the Max Planck Institute for Extraterrestrial Physics (MPE) laboratories. In this paper we present the design, specifications and measured cold performances of the cryostat. We also provide an overview of the tests planned inside the cryostat, which will start at the beginning of 2024 and will run until beginning of 2026, when the mechanisms and the cold optics modules will be finally integrated inside the MICADO Instrument Cryostat.

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A. Monna, F. Lang, L. Spallek, L. Neumeier, J. Lange, F. Grupp, A. Emslander, F. Biondi, and R. Bender "The MICADO first light imager for the ELT: USM big test cryostat: design, performances, and test activities", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130965G (18 July 2024); https://doi.org/10.1117/12.3019019

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