Warm calibration unit of the mid-infrared ELT instrument METIS: overview and current status towards FDR

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; Felix Bettonvil

doi:10.1117/12.2630802

29 August 2022 Warm calibration unit of the mid-infrared ELT instrument METIS: overview and current status towards FDR

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, Felix Bettonvil

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121843M (2022) https://doi.org/10.1117/12.2630802
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

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.

Citation Download Citation

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

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available