24 July 2014 Final optical design for the WEAVE two-degree prime focus corrector
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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.
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Tibor Agócs, Tibor Agócs, Don Carlos Abrams, Don Carlos Abrams, Emilie Lhomé, Emilie Lhomé, Kevin Dee, Kevin Dee, Gavin Dalton, Gavin Dalton, Kevin Middleton, Kevin Middleton, Piercarlo Bonifacio, Piercarlo Bonifacio, J. Alfonso L. Aguerri, J. Alfonso L. Aguerri, S. C. Trager, S. C. Trager, } "Final optical design for the WEAVE two-degree prime focus corrector", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914773 (24 July 2014); doi: 10.1117/12.2055306; https://doi.org/10.1117/12.2055306
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