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Proceedings Paper

Final optical design for the WEAVE two-degree prime focus corrector
Author(s): Tibor Agócs; Don Carlos Abrams; Emilie Lhomé; Kevin Dee; Gavin Dalton; Kevin Middleton; Piercarlo Bonifacio; J. Alfonso L. Aguerri; S. C. Trager
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Paper Abstract

WEAVE is the next-generation wide-field optical spectroscopy facility for the William Herschel Telescope (WHT) in La Palma, Canary Islands, Spain. We present the final optical design for the two-degree Prime Focus Corrector (PFC) for the WHT optimised for WEAVE. The nominal optical design provides a polychromatic PSF that does not exceed 0.6 arcsec (80% encircled energy diameter) over a wavelength range from 370 to 1000 nm covering a two-degree field-of-view (FOV) for zenith angles up to 65 degrees. We describe the optical issues that had to be addressed prior to the Final Design Review (FDR) and present the trade-offs that were necessary between manufacturability and performance. We detail the results of an in-depth Monte Carlo simulation that contains all the manufacturing, alignment and stability issues that affect the PSF error budget of the Prime Focus Corrector. As a result of multiple iterations regarding the different tolerances of the system, the polychromatic PSF (80% encircled energy diameter) including all errors stays below the required 1 arcsec.

Paper Details

Date Published: 24 July 2014
PDF: 14 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914773 (24 July 2014); doi: 10.1117/12.2055306
Show Author Affiliations
Tibor Agócs, NOVA ASTRON (Netherlands)
Don Carlos Abrams, Isaac Newton Group of Telescopes (Spain)
Emilie Lhomé, Isaac Newton Group of Telescopes (Spain)
Kevin Dee, Isaac Newton Group of Telescopes (Spain)
Gavin Dalton, STFC Rutherford Appleton Lab. (United Kingdom)
Univ. of Oxford (United Kingdom)
Kevin Middleton, STFC Rutherford Appleton Lab. (United Kingdom)
Piercarlo Bonifacio, GEPI, Observatoire de Paris (France)
J. Alfonso L. Aguerri, Instituto de Astrofísica de Canarias (Spain)
S. C. Trager, Univ. of Groningen (Netherlands)

Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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