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Proceedings Paper

GRACE: a controlled environment for adaptive optics at the William Herschel Telescope
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Paper Abstract

The William Herschel Telescope (WHT) has an adaptive optics (AO) suite consisting of the AO system NAOMI, near IR imager INGRID, optical field spectrograph OASIS and coronagraph OSCA. GRACE (GRound based Adaptive optics Controlled Environment) is a dedicated structure at a Nasmyth focus designed to facilitate routine AO use by providing a controlled environment for the instrument system. However, GRACE is not just a building; it is all of the systems associated with providing the controlled environment, especially the control of air quality, temperature and flow. A key concern was that adding the GRACE building to the Nasmyth platform would not adversely change the telescope performance. This paper gives the background to GRACE, its specification and design, the building construction and installation, the environmental controls installed and their performance, the services provided, the effect of the new structure on telescope performance, the results of the project, including the effect having a controlled environment on AO performance and its planned use for a Rayleigh laser guide star system.

Paper Details

Date Published: 25 October 2004
PDF: 11 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.551109
Show Author Affiliations
Gordon Talbot, Isaac Newton Group of Telescopes (Spain)
Don Carlos Abrams, Isaac Newton Group of Telescopes (Spain)
Chris R. Benn, Isaac Newton Group of Telescopes (Spain)
Alan Chopping, Isaac Newton Group of Telescopes (Spain)
Kevin Dee, Isaac Newton Group of Telescopes (Spain)
Sebastian Els, Isaac Newton Group of Telescopes (Spain)
Martin Fisher, FASE (United Kingdom)
Stephen Goodsell, Isaac Newton Group of Telescopes (Spain)
Doug Gray, Isaac Newton Group of Telescopes (Spain)
Paul D. Jolley, Isaac Newton Group of Telescopes (Spain)

Published in SPIE Proceedings Vol. 5490:
Advancements in Adaptive Optics
Domenico Bonaccini Calia; Brent L. Ellerbroek; Roberto Ragazzoni, Editor(s)

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