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Proceedings Paper

Conceptual design of a cryogenic pupil mechanism with continuous complex movements for HARMONI
Author(s): Elvio Hernández; Luis F. Rodríguez; José V. Gigante; Oscar Tubío; Tomas Moreno; Jorge Sánchez; José M. Herreros; Begoña Garcia; Evencio Mediavilla; Niranjan Thatte; Ian Bryson; Hermine Schnetler; Fraser Clarke; Matthias Tecza
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Paper Abstract

In order to improve the signal-to-noise ratio of HARMONI (E-ELT first light visible and near-infrared integral field VIR spectrometer), a pupil mask has been identified to be included at the fore-optics to limit the background radiation coming into the spectrographs. This mask should rotate synchronously with the telescope pupil during observations, taking into account the combined effects of the telescope tracking and the de-rotation of the FOV. The implementation of the pupil mask functionality will require complex movements with high precision at cryogenic temperatures which implies an important technological challenge. This paper details a set of experiments completed to gain knowledge and experience in order to accomplish the design and control of cryogenic mechanisms reaching this type of pupil motion. The conceptual design of the whole mechanism started from the feedback acquired from those experiments is also described in the following sections.

Paper Details

Date Published: 18 July 2014
PDF: 6 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91513F (18 July 2014); doi: 10.1117/12.2055933
Show Author Affiliations
Elvio Hernández, Instituto de Astrofísica de Canarias (Spain)
Luis F. Rodríguez, Instituto de Astrofísica de Canarias (Spain)
José V. Gigante, Instituto de Astrofísica de Canarias (Spain)
Oscar Tubío, Instituto de Astrofísica de Canarias (Spain)
Tomas Moreno, Instituto de Astrofísica de Canarias (Spain)
Jorge Sánchez, Instituto de Astrofísica de Canarias (Spain)
José M. Herreros, Instituto de Astrofísica de Canarias (Spain)
Begoña Garcia, Instituto de Astrofísica de Canarias (Spain)
Evencio Mediavilla, Instituto de Astrofísica de Canarias (Spain)
Niranjan Thatte, Univ. of Oxford (United Kingdom)
Ian Bryson, UK Astronomy Technology Ctr. (United Kingdom)
Hermine Schnetler, UK Astronomy Technology Ctr. (United Kingdom)
Fraser Clarke, Univ. of Oxford (United Kingdom)
Matthias Tecza, Univ. of Oxford (United Kingdom)


Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)

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