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METIS opto-mechanical design and packaging study
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Paper Abstract

METIS: "Mid-infrared ELT Imager and Spectrograph" is the mid-infrared (3 - 14 microns) instrument for imaging and spectroscopy for the European Extremely Large Telescope (E-ELT). To ensure high detection sensitivity the internal radiation of the instrument needs to be eliminated (sufficiently reduced) and thus needs to be operated at cryogenic temperatures. The instrument is divided in a cold and warm system. The cold system, the actual heart of the system, is subdivided into five main opto-mechanical modules located within a common cryostat (part of the warm system). The warm system provides the crucial environment for the cold system, including the instrument control and maintenance equipment. The end 2009 finished Phase-A study carried out within the framework of the ESO sponsored E-ELT instrumentation studies has been performed by an international consortium with institutes from Netherlands (PI: Bernhard Brandl - NOVA), Germany, France, United Kingdom and Belgium. During this conference various aspects of the METIS instrument (design) are presented in several papers, including the instrument concept and science case, and the system engineering and optical design. This paper describes the design constraints and key issues regarding the packaging of this complex cryogenic instrument. The design solutions to create a light, small and fully accessible instrument are discussed together with the specific subdivision of the cold and warm system to ensure concurrent development at various different institutes around Europe. In addition the paper addresses the design and development studies for the special, challenging units such as the large optical image de-rotator, the (2D) chopper mechanism and the special cryogenic drives.

Paper Details

Date Published: 15 July 2010
PDF: 12 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77352J (15 July 2010); doi: 10.1117/12.856988
Show Author Affiliations
Gabby Kroes, NOVA-ASTRON (Netherlands)
Rik ter Horst, NOVA-ASTRON (Netherlands)
Jan Kragt, NOVA-ASTRON (Netherlands)
Ronald Roelfsema, NOVA-ASTRON (Netherlands)
Ramón Navarro, NOVA-ASTRON (Netherlands)
Lars Venema, ASTRON (Netherlands)
Rainer Lenzen, Max-Planck-Institut für Astronomie (Germany)
Ralf R. Rohloff, Max-Planck-Institut für Astronomie (Germany)
Gilles Durand, DSM/DAPNIA, Service d'Astrophysique, CEA Saclay (France)
Eric Pantin, DSM/DAPNIA, Service d'Astrophysique, CEA Saclay (France)
Samuel Ronayette, DSM/DAPNIA, Service d'Astrophysique, CEA Saclay (France)
Stephen Todd, UK Astronomy Technology Ctr., The Royal Observatory Edinburgh (United Kingdom)
Richard Bennett, UK Astronomy Technology Ctr., The Royal Observatory Edinburgh (United Kingdom)
Alistair Glasse, UK Astronomy Technology Ctr., The Royal Observatory Edinburgh (United Kingdom)
Joris Blommaert, Katholieke Univ. Leuven (Belgium)
Bernhard Brandl, Leiden Observatory, Leiden Univ. (Netherlands)
Maurice Teuwen, Janssen Precision Engineering (Netherlands)
Huub Janssen, Janssen Precision Engineering (Netherlands)
Robert Huisman, SRON (Netherlands)

Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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