Installation of the Dark Energy Spectroscopic Instrument at the Mayall 4-meter telescope

Robert Besuner; Lori Allen; Charles Baltay; David Brooks; Pierre-Henri Carton; Andrew Peter Doel; John Donaldson; Yutong Duan; Patrick Dunlop; Jerry Edelstein; Matt Evatt; Parker Fagrelius; Enrique Gaztanaga; Derek Guenther; Gaston Gutierrez; Michael Hawes; Klaus Honscheid; Pat Jelinsky; Richard Joyce; Armin Karcher; Martin Landriau; Michael Levi; Christophe Magneville; Robert Marshall; Paul Martini; Daniel Pappalardo; Claire Poppett; Francisco Prada; Ashley J. Ross; Michael Schubnell; Ray Sharples; William Shourt; Joseph Harry Silber; David Sprayberry; Bob Stupak; Gregory Tarle; Kai Zhang

doi:10.1117/12.2561507

13 December 2020 Installation of the Dark Energy Spectroscopic Instrument at the Mayall 4-meter telescope

Robert Besuner, Lori Allen, Charles Baltay, David Brooks, Pierre-Henri Carton, Andrew Peter Doel, John Donaldson, Yutong Duan, Patrick Dunlop, Jerry Edelstein, Matt Evatt, Parker Fagrelius, Enrique Gaztanaga, Derek Guenther, Gaston Gutierrez, Michael Hawes, Klaus Honscheid, Pat Jelinsky, Richard Joyce, Armin Karcher, Martin Landriau, Michael Levi, Christophe Magneville, Robert Marshall, Paul Martini, Daniel Pappalardo, Claire Poppett, Francisco Prada, Ashley J. Ross, Michael Schubnell, Ray Sharples, William Shourt, Joseph Harry Silber, David Sprayberry, Bob Stupak, Gregory Tarle, Kai Zhang

Author Affiliations +

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 1144710 (2020) https://doi.org/10.1117/12.2561507
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

The Dark Energy Spectroscopic Instrument (DESI) is a Stage IV ground-based dark energy experiment that will 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. We describe the installation of the major elements of the instrument at the Mayall 4m telescope, completed in late 2019. The previous prime focus corrector, spider vanes, and upper rings were removed from the Mayall’s Serrurier truss and replaced with the newlyconstructed DESI ring, vanes, cage, hexapod, and optical corrector. The new corrector was optically aligned with the primary mirror using a laser tracker system. The DESI focal plane system was integrated to the corrector, with each of its ten 500-fiber-positioner petal segments installed using custom installation hardware and the laser tracker. Ten DESI spectrographs with 30 cryostats were installed in a newly assembled clean room in the Large Coude Room. The ten cables carrying 5000 optical fibers from the positioners in the focal plane were routed down the telescope through cable wraps at the declination and hour angle axes, and their integral slitheads were integrated with the ten spectrographs. The fiber view camera assembly was installed to the Mayall’s primary mirror cell. Servers for the instrument control system replaced existing computer equipment. The fully integrated instrument has been commissioned and is ready to start its operations phase.

Conference Presentation

Citation Download Citation

Robert Besuner, Lori Allen, Charles Baltay, David Brooks, Pierre-Henri Carton, Andrew Peter Doel, John Donaldson, Yutong Duan, Patrick Dunlop, Jerry Edelstein, Matt Evatt, Parker Fagrelius, Enrique Gaztanaga, Derek Guenther, Gaston Gutierrez, Michael Hawes, Klaus Honscheid, Pat Jelinsky, Richard Joyce, Armin Karcher, Martin Landriau, Michael Levi, Christophe Magneville, Robert Marshall, Paul Martini, Daniel Pappalardo, Claire Poppett, Francisco Prada, Ashley J. Ross, Michael Schubnell, Ray Sharples, William Shourt, Joseph Harry Silber, David Sprayberry, Bob Stupak, Gregory Tarle, and Kai Zhang "Installation of the Dark Energy Spectroscopic Instrument at the Mayall 4-meter telescope", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 1144710 (13 December 2020); https://doi.org/10.1117/12.2561507

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available