Performance of the Dark Energy Spectroscopic Instrument (DESI) focal plane

Parker Fagrelius*, Yutong Duan, Kevin Fanning, Klaus Honscheid, Stephen Kent, Paul Martini, Claire Poppett, David Rabinowitz, Michael Schubnell, Joseph Silber, David Brooks, Todd Claybaugh, Peter Doel, Enrique Gaztañaga, Michael Levi, Christophe Magneville, Francisco Prada, Greg Tarlé

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The recently commissioned Dark Energy Spectroscopic Instrument (DESI) will measure the expansion history of the Universe using the Baryon Acoustic Oscillation technique. The spectra of 35 million galaxies and quasars over 14,000 sq deg will be measured during the life of the experiment. A new prime focus corrector for the KPNO Mayall telescope delivers light to 5,000 fiber optic positioners which in turn feed ten broad-band spectrographs. The DESI focal plane subsystem contains the fiber optic positioners and guide and focus cameras, which enable the alignment of fibers with astronomical targets. This paper describes the performance of the installed instrument.

Original languageEnglish
Title of host publicationGround-Based and Airborne Instrumentation for Astronomy VIII
EditorsChristopher J. Evans, Julia J. Bryant, Kentaro Motohara
PublisherSPIE Press
ISBN (Electronic)9781510636811
Publication statusPublished - 13 Dec 2020
EventGround-Based and Airborne Instrumentation for Astronomy VIII 2020 - Virtual, Online, United States
Duration: 14 Dec 202022 Dec 2020

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceGround-Based and Airborne Instrumentation for Astronomy VIII 2020
Country/TerritoryUnited States
CityVirtual, Online


  • DESI
  • focal plane
  • robotic positioners

Cite this