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Proceedings Paper

MUSE optical alignment procedure
Author(s): Florence Laurent; Edgard Renault; Magali Loupias; Johan Kosmalski; Heiko Anwand; Roland Bacon; Didier Boudon; Patrick Caillier; Eric Daguisé; Jean-Pierre Dubois; Christophe Dupuy; Andreas Kelz; Jean-Louis Lizon; Harald Nicklas; Laurent Parès; Alban Remillieux; Walter Seifert; Hervé Valentin; Wenli Xu
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Paper Abstract

MUSE (Multi Unit Spectroscopic Explorer) is a second generation VLT integral field spectrograph (1x1arcmin² Field of View) developed for the European Southern Observatory (ESO), operating in the visible wavelength range (0.465-0.93 μm). A consortium of seven institutes is currently assembling and testing MUSE in the Integration Hall of the Observatoire de Lyon for the Preliminary Acceptance in Europe, scheduled for 2013. MUSE is composed of several subsystems which are under the responsibility of each institute. The Fore Optics derotates and anamorphoses the image at the focal plane. A Splitting and Relay Optics feed the 24 identical Integral Field Units (IFU), that are mounted within a large monolithic instrument mechanical structure. Each IFU incorporates an image slicer, a fully refractive spectrograph with VPH-grating and a detector system connected to a global vacuum and cryogenic system. During 2011, all MUSE subsystems were integrated, aligned and tested independently in each institute. After validations, the systems were shipped to the P.I. institute at Lyon and were assembled in the Integration Hall This paper describes the end-to-end optical alignment procedure of the MUSE instrument. The design strategy, mixing an optical alignment by manufacturing (plug and play approach) and few adjustments on key components, is presented. We depict the alignment method for identifying the optical axis using several references located in pupil and image planes. All tools required to perform the global alignment between each subsystem are described. The success of this alignment approach is demonstrated by the good results for the MUSE image quality. MUSE commissioning at the VLT (Very Large Telescope) is planned for 2013.

Paper Details

Date Published: 24 September 2012
PDF: 12 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84465X (24 September 2012); doi: 10.1117/12.926975
Show Author Affiliations
Florence Laurent, Observatoire de Lyon, CNRS, Univ. de Lyon (France)
Ctr. de Recherche Astronomique de Lyon (France)
Edgard Renault, Observatoire de Lyon, CNRS, Univ. de Lyon (France)
Magali Loupias, Observatoire de Lyon, CNRS, Univ. de Lyon (France)
Johan Kosmalski, Observatoire de Lyon, CNRS, Univ. de Lyon (France)
Heiko Anwand, Institut für Astrophysik, Georg-August-Univ. Göttingen (Germany)
Roland Bacon, Observatoire de Lyon, CNRS, Univ. de Lyon (France)
Didier Boudon, Observatoire de Lyon, CNRS, Univ. de Lyon (France)
Patrick Caillier, Observatoire de Lyon, CNRS, Univ. de Lyon (France)
Eric Daguisé, Observatoire de Lyon, CNRS, Univ. de Lyon (France)
Jean-Pierre Dubois, Observatoire de Lyon, CNRS, Univ. de Lyon (France)
Christophe Dupuy, European Southern Observatory (Germany)
Andreas Kelz, Leibniz-Institut für Astrophysik Potsdam (Germany)
Jean-Louis Lizon, European Southern Observatory (Germany)
Harald Nicklas, Institut für Astrophysik, Georg-August-Univ. Göttingen (Germany)
Laurent Parès, Institut de Recherche en Astrophysique et Planétologie, CNRS, Univ. de Toulouse (France)
Alban Remillieux, Observatoire de Lyon, CNRS, Univ. de Lyon (France)
Walter Seifert, Zentrum für Astronomie, Landessternwarte Heidelberg (Germany)
Hervé Valentin, Institut de Recherche en Astrophysique et Planétologie, CNRS, Univ. de Toulouse (France)
Wenli Xu, Optical System Engineering (France)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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