Poster + Paper
29 August 2022 Warm calibration unit of the mid-infrared ELT instrument METIS: overview and current status towards FDR
Author Affiliations +
Conference Poster
Abstract
The warm calibration unit (WCU) is one of the subsystems of the future METIS instrument on the Extremely Large Telescope (ELT). Operating at room temperature, the WCU is mounted above the main cryostat of METIS. It will be employed as a calibration reference for science observations, as well as for verification and alignment purposes during the AIT phase. The WCU is designed and constructed at the University of Cologne, one of the partner in the METIS consortium. WCU recently went through a successful Optics Long Lead Items Review by ESO. Now, the WCU is entering the last phase of the project, the Final Design Review (FDR). In this paper, we present the current status of the WCU design and summarize the mechanical and system engineering work. We describe the design of the hexapod formed by six manually adjustable links and its interfaces with the METIS cryostat together with the CFRP-based optical bench and Invar-based optical mounts. Lab prototyping results of one actuator under a nominal load of 5 kN confirms the achievable high linear resolution (20 µm). We present the status of the WCU laser cabinet. We discuss the lastest progress in the laboratory testing of some WCU functionalities, such as the fibre-fed monochromatic sources for the spectral calibration of the LM-Spectrograph of METIS, and the spatial calibration sources using the integrating sphere. We detail the activities foreseen until FDR together with the preparation of the sub-system MAIT work.
© (2022) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Monika Rutowska, Tarun Kumar Sharma, Michael Wiest, Sabine Graf, Lucas Labadie, Christian Straubmeier, Andreas Eckart, Stephen Todd, Tibor Agócs, Gert Raskin, Jan Goris, Marchel Gerbers, Leonard Burtscher, Roy van Boekel, Adrian Glauser, Jeffrey Lynn, Bernhard Brandl, and Felix Bettonvil "Warm calibration unit of the mid-infrared ELT instrument METIS: overview and current status towards FDR", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121843M (29 August 2022); https://doi.org/10.1117/12.2630802
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KEYWORDS
Optical fibers

Mirrors

Mirror mounts

Calibration

Interfaces

Integrating spheres

Helium neon lasers

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