9 August 2016 Stray light assessment and mitigation for the DESI front-end optical system
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Abstract
The Dark Energy Spectroscopic Instrument (DESI) is under construction to measure the expansion history of the Universe, using the Baryon Acoustic Oscillation technique and the growth of structure using redshift-space distortions (RSD). The spectra of 40 million galaxies over 14000 square degrees will be measured during the life of the experiment. A new prime focus corrector for the KPNO Mayall telescope will deliver light to 5000 fiber optic positioners. The fibers in turn feed ten broad-band spectrographs. We will describe modeling and mitigation of stray light within the front end of DESI, consisting of the Mayall telescope and the corrector assembly. This includes the creation of a stray light model, quantitative analysis of the unwanted light at the corrector focal surface, identification of the main scattering sources, and a description of mitigation strategies to remove the sources.
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Timothy N. Miller, Timothy N. Miller, Michael Lampton, Michael Lampton, Robert W. Besuner, Robert W. Besuner, Michael J. Sholl, Michael J. Sholl, Ming Liang, Ming Liang, Scott Ellis, Scott Ellis, "Stray light assessment and mitigation for the DESI front-end optical system", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99088O (9 August 2016); doi: 10.1117/12.2232845; https://doi.org/10.1117/12.2232845
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