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Proceedings Paper

Progress on the fabrication of the DESI corrector optics
Author(s): Timothy N. Miller; Peter Doel; David Brooks; Michael J. Sholl; Michael E. Levi
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Paper Abstract

The Dark Energy Spectroscopic Instrument (DESI) is under construction to measure the expansion history of the Universe using the Baryon Acoustic Oscillation technique. 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 Kitt Peak National Observatory Mayall telescope will deliver light to 5000 fiber optic positioners. The fibers in turn feed ten broad-band spectrographs. We will describe the status of the DESI corrector optics, a series of 0.8 to 1.1-meter fused silica and borosilicate lenses currently being fabricated to demanding requirements. We will describe the specs for lenses that are finished or underway, including surface figure, homogeneity, and other parameters; the current schedule for lens production; and a comparison against DESI corrector requirements.

Paper Details

Date Published: 9 August 2016
PDF: 8 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99088J (9 August 2016); doi: 10.1117/12.2232739
Show Author Affiliations
Timothy N. Miller, Lawrence Berkeley National Lab. (United States)
Peter Doel, Univ. College London (United Kingdom)
David Brooks, Univ. College London (United Kingdom)
Michael J. Sholl, Lawrence Berkeley National Lab. (United States)
Alphabet Inc. (United States)
Michael E. Levi, Lawrence Berkeley National Lab. (United States)

Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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