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 35 million galaxies and quasars 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 present an overview of the instrumentation, the main technical requirements and challenges, and the current status of the project.
Paul Martini, Stephen Bailey, Robert W. Besuner, David Brooks, Peter Doel, Jerry Edelstein, Daniel Eisenstein, Brenna Flaugher, Gaston Gutierrez, Stewart E. Harris, Klaus Honscheid, Patrick Jelinsky, Richard Joyce, Stephen Kent, Michael Levi, Francisco Prada, Claire Poppett, David Rabinowitz, Constance Rockosi, Laia Cardiel Sas, David J. Schlegel, Michael Schubnell, Ray Sharples, Joseph H Silber, David Sprayberry, and Risa Wechsler, "Overview of the Dark Energy Spectroscopic Instrument," Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107021F (Presented at SPIE Astronomical Telescopes + Instrumentation: June 13, 2018; Published: 6 July 2018); https://doi.org/10.1117/12.2313063.
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