20 July 2010 Two-degree FOV prime focus corrector and ADC concepts for the 4.2m WHT
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Abstract
We present two conceptual optical designs for a new refractive corrector for the prime focus of the 4.2m William Herschel Telescope, optimised to allow wide-field multi-object spectroscopy. The proposed designs satisfy the demanding requirement that the PSF be smaller than 0.5 arcsec (80% encircled energy) over a two degree FOV and a wavelength range of 370 - 1000 nm. We discuss the specifications and describe the design process for the correctors, which also act as atmospheric dispersion correctors (ADC). The designs we present form the basis of a realistic manufacturable system.
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Tibor Agócs, Marc Balcells, Chris R. Benn, Don Carlos Abrams, Diego Cano Infantes, "Two-degree FOV prime focus corrector and ADC concepts for the 4.2m WHT", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773563 (20 July 2010); doi: 10.1117/12.856881; https://doi.org/10.1117/12.856881
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