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Proceedings Paper

Preliminary optical design for the WEAVE two-degree prime focus corrector
Author(s): Tibor Agócs; Don Carlos Abrams; Diego Cano Infantes; Neil O'Mahony; Kevin Dee; Jean-Baptiste Daban; Carole Gouvret; Sebastien Ottogalli
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Paper Abstract

We present the preliminary optical design for a new two-degree refractive prime focus corrector for the 4.2m William Herschel Telescope optimised for the wide-field multi-object spectrograph, WEAVE (WHT Enhanced Area Velocity Explorer). From the two conceptual designs described previously [1], the counter-rotating atmospheric dispersion corrector approach was selected and further optimized to meet the flat image surface requirement. The preliminary design provides good polychromatic image quality. The PSF does not exceed 0.6 arcsec (80% encircled energy) over a wavelength range from 370 to 1000nm covering a two degree FOV for zenith angles up to 65 degrees. We describe the corrector's performance and the trade-off between telecentricity and the requirement for a flat image surface. We present the results of the tolerance and thermal analyses, ghost and scattered light calculations and the finite element analysis that are necessary to establish the PSF error budget for the corrector.

Paper Details

Date Published: 17 September 2012
PDF: 15 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84446J (17 September 2012); doi: 10.1117/12.925136
Show Author Affiliations
Tibor Agócs, ASTRON (Netherlands)
Don Carlos Abrams, Isaac Newton Group of Telescopes (Spain)
Diego Cano Infantes, Isaac Newton Group of Telescopes (Spain)
Neil O'Mahony, Isaac Newton Group of Telescopes (Spain)
Kevin Dee, Engineering & Project Solutions Ltd. (United Kingdom)
Jean-Baptiste Daban, Observatoire de la Côte d'Azur, Lab. Lagrange, CNRS, Univ. de Nice Sophia Antipolis (France)
Carole Gouvret, Observatoire de la Côte d'Azur, Lab. Lagrange, CNRS, Univ. de Nice Sophia Antipolis (France)
Sebastien Ottogalli, Observatoire de la Côte d'Azur, Lab. Lagrange, CNRS, Univ. de Nice Sophia Antipolis (France)


Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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