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.
@article{arxiv.1807.09287,
title = {Overview of the Dark Energy Spectroscopic Instrument},
author = {Paul Martini and Stephen Bailey and Robert W. Besuner and David Brooks and Peter Doel and Jerry Edelstein and Daniel Eisenstein and Brenna Flaugher and Gaston Gutierrez and Stewart E. Harris and Klaus Honscheid and Patrick Jelinsky and Richard Joyce and Stephen Kent and Michael Levi and Francisco Prada and Claire Poppett and David Rabinowitz and Constance Rockosi and Laia Cardiel Sas and David J. Schlegel and Michael Schubnell and Ray Sharples and Joseph H. Silber and David Sprayberry and Risa Wechsler},
journal= {arXiv preprint arXiv:1807.09287},
year = {2018}
}