A cryogenic actuator for the image derotator on ELT-METIS

Olivier Corpace; Jean-Christophe Barrière; Ayoub Bounab; Olivier Cloué; Achrène Dyrek; Jean Fontignié; Jean-Christophe Guillard; Stéphane Jury; Mickaël Lacroix; Ivan Lloro; Jeffrey Lynn; Jorge Mendes; Gert Raskin; Yann Reinert; Erik Ruinemans; Niels Tromp

doi:10.1117/12.2560259

13 December 2020 A cryogenic actuator for the image derotator on ELT-METIS

Olivier Corpace, Jean-Christophe Barrière, Ayoub Bounab, Olivier Cloué, Achrène Dyrek, Jean Fontignié, Jean-Christophe Guillard, Stéphane Jury, Mickaël Lacroix, Ivan Lloro, Jeffrey Lynn, Jorge Mendes, Gert Raskin, Yann Reinert, Erik Ruinemans, Niels Tromp

Author Affiliations +

Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 114511O (2020) https://doi.org/10.1117/12.2560259
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

The Mid-infrared Imager and Spectrograph (METIS) is one of the first light instruments of the European Extremely Large Telescope (ELT). METIS optical design contains a first stage called common fore optics, which operates at cryogenic temperatures. Because of the azimuthal motions of the telescope, it integrates a field derotator, which has to run under vacuum and at 67 K. The French Alternative Energies and Atomic Energy Commission (CEA) is in charge of developing the cryogenic rotation stage, which actuates this field derotator. This is a kind of technological breakthrough as all the existing derotator systems operate outside the cryogenic vessels. This paper gives an overview of the derotator actuator design with the different trades that have been studied and some preliminary tests results.

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Olivier Corpace, Jean-Christophe Barrière, Ayoub Bounab, Olivier Cloué, Achrène Dyrek, Jean Fontignié, Jean-Christophe Guillard, Stéphane Jury, Mickaël Lacroix, Ivan Lloro, Jeffrey Lynn, Jorge Mendes, Gert Raskin, Yann Reinert, Erik Ruinemans, and Niels Tromp "A cryogenic actuator for the image derotator on ELT-METIS", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 114511O (13 December 2020); https://doi.org/10.1117/12.2560259

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KEYWORDS

Cryogenics

Actuators

Feedback control

Computer simulations

Device simulation

Mirrors

Performance modeling

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