Adaptive Optics; Control System; ELT; METIS; Real-time-computer
Abstract :
[en] The Mid-infrared ELT Imager and Spectrograph (METIS) instrument is one of three first-generation science instruments for the Extremely Large Telescope (ELT) in Chile. It has entered the Manufacturing, Assembly, Integration and Testing (MAIT) phase and it is currently scheduled to be installed in 2028. Its Single Conjugate Adaptive Optics (SCAO) system will provide the performance of an extreme adaptive optics system which enables high-contrast imaging (HCI) observations in the thermal/mid-infrared wavelength domain. The METIS Adaptive Optics (AO) control system is responsible for the AO wavefront correction and for supporting AO-related assembly, integration, verification and maintenance activities. It realizes the main AO loop by a Real-Time Computer (RTC) that receives images from a wavefront sensor and commands the corrective optics through the Central Control System (CCS) of the ELT. Several auxiliary functions will run outside of the RTC in the AO Observation Coordination System (AO OCS) that are necessary to maintain the quality of the wavefront correction. For instance, the Differential tip-tilt (DTT) control loop centers the star on the Vortex Phase Mask during HCI observations by adjusting the modulator device via the SCAO Function Control System (FCS) based on sciences images received from the Focal Plane Sensor Gateway (FPS GW). Conceptually, the METIS Adaptive Optics Control System (AOCS) is a distributed software system that is controlled by the METIS Instrument Control System (ICS). This paper describes the current status of the METIS AO control system, driving forces behind the design and the important control loops.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Kulas, Martin; Max Planck Institute for Astronomy, Heidelberg, Germany
Absil, Olivier ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Bertram, Thomas; Max Planck Institute for Astronomy, Heidelberg, Germany
Briegel, Florian; Max Planck Institute for Astronomy, Heidelberg, Germany
Coppejans, Hugo; Max Planck Institute for Astronomy, Heidelberg, Germany
Correia, Carlos; Universidade do Porto, Departamento de Engenharia Física, Portugal
De Meester, Wim; KU Leuven, Belgium
Feldt, Markus; Max Planck Institute for Astronomy, Heidelberg, Germany
Naranjo, Vianak; Max Planck Institute for Astronomy, Heidelberg, Germany
Obereder, Andreas; Linz University, Institute for Industrial Mathematics, Austria
Orban De Xivry, Gilles ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Steuer, Horst; Max Planck Institute for Astronomy, Heidelberg, Germany
ERC - European Research Council F.R.S.-FNRS - Fonds de la Recherche Scientifique EU - European Union
Funding number :
819155
Commentary :
Copyright 2024 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.
T. Bertram et al., “How to make METIS SCAO work,” in Adaptive Optics Systems IX, SPIE, 2024.
H. Coppejans et al., “METIS RTC as a computationally heavy system,” in Software and Cyberinfrastructure for Astronomy VIII, SPIE, 2024.
M. Kulas, H. Coppejans, H. Steuer, T. Bertram, F. Briegel, C. M. Correia, and P. Neureuther, “The rtc for metis scao,” in Adaptive Optics for Extremely Large Telescopes, 7, 2023.
G. Orban de Xivry, O. Absil, C. Delacroix, P. Pathak, M. Quesnel, and T. Bertram, “An asymmetric Lyot wavefront sensor for the ELT/METIS vortex coronagraph,” in Adaptive Optics Systems IX, SPIE, 2024.
H. Coppejans, T. Bertram, M. Kulas, H. Steuer, and C. Correia, “Subpixel pupil tracking on metis for elt,” in Adaptive Optics for Extremely Large Telescopes, 7, 2023.