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VIRUS: comparison of lab characterization with on-sky performance for multiple spectrograph units
Author(s): Briana L. Indahl; Gary J. Hill; Greg Zeimann; Cynthia Froning; Karl Gebhardt; Andreas Kelz; Thomas Jahn; Francesco Montesano; Jan Snigula; Phillip MacQueen; Trent Peterson; Niv Drory; Taylor Chonis; Hanshin Lee; Brian L. Vattiat; Jason Ramsey; Andrew Peterson
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Paper Abstract

The Visible Integral Field Replicable Unit Spectrograph (VIRUS), the instrument for the Hobby Eberly Telescope Dark Energy Experiment (HETDEX), consists of 78 replicable units, each with two integral field spectrographs. The VIRUS design takes advantage of large-scale replication of simple units to significantly reduce engineering and production costs of building a facility instrument of this scale. With VIRUS being 156 realizations of the same spectrograph, this paper uncovers the statistical variations in production of these units. Lab relative throughput measures are compared with independently measured grating and optical element performance allowing for potential diagnosis for the cause of variation due to spectrograph elements. Based on variations in performance of individual optical components, throughput curves are simulated for 156 VIRUS spectrograph channels. Once delivered, each unit is paired with a fiber bundle and throughput measurements are made on sky using twilight flats. We compare throughput variance from on-sky measurements to the simulated throughputs. We find that the variation in throughput matches that predicted by modeling of the individual optics performance. This paper presents the results for the 40 VIRUS units now deployed.

Paper Details

Date Published: 10 July 2018
PDF: 12 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070281 (10 July 2018); doi: 10.1117/12.2313051
Show Author Affiliations
Briana L. Indahl, The Univ. of Texas at Austin (United States)
Gary J. Hill, The Univ. of Texas at Austin (United States)
Greg Zeimann, The Univ. of Texas at Austin (United States)
Cynthia Froning, The Univ. of Texas at Austin (United States)
Karl Gebhardt, The Univ. of Texas at Austin (United States)
Andreas Kelz, Leibniz-Institut für Astrophysik Potsdam (Germany)
Thomas Jahn, Leibniz-Institut für Astrophysik Potsdam (Germany)
Francesco Montesano, Max-Planck-Institut für Extraterrestriche-Physik (Germany)
Jan Snigula, Max-Planck-Institut für Extraterrestriche-Physik (Germany)
Phillip MacQueen, The Univ. of Texas at Austin (United States)
Trent Peterson, The Univ. of Texas at Austin (United States)
Niv Drory, The Univ. of Texas at Austin (United States)
Taylor Chonis, Ball Aerospace (United States)
The Univ. of Texas at Austin (United States)
Hanshin Lee, The Univ. of Texas at Austin (United States)
Brian L. Vattiat, The Univ. of Texas at Austin (United States)
Jason Ramsey, The Univ. of Texas at Austin (United States)
Andrew Peterson, The Univ. of Texas at Austin (United States)


Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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