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20 July 2010Visible Integral-field Replicable Unit Spectrograph (VIRUS) optical tolerance
The Visible Integral-field Replicable Unit Spectrograph (VIRUS) instrument is made up of 150+ individually compact
and identical spectrographs, each fed by a fiber integral field unit. The instrument provides integral field spectroscopy
from 350 nm to 550 nm of over 33,600 spatial elements per observation, each 1.8 arcsec2 on the sky, at R ~ 700. The
instrument will be fed by a new wide-field corrector (WFC) of the Hobby-Eberly Telescope (HET†) with increased
science field of view as large as 22 arcmin diameter and telescope aperture of 10 m. The construction of the large
number of VIRUS units requires the individual spectrographs be interchangeable at sub-system level and a production
line assembly process be utilized, while meeting the optical performance specification. These requirements pose a strong
emphasis on careful analysis of the manufacturing and alignment tolerances of the unit spectrograph design. In this
paper, we detail the tolerance analysis, and discuss its implication to the optical performance and production of the
VIRUS instrument.
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Hanshin Lee, Gary J. Hill, Jennifer L. Marshall, Brian L. Vattiat, Darren L. DePoy, "Visible Integral-field Replicable Unit Spectrograph (VIRUS) optical tolerance," Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77353X (20 July 2010); https://doi.org/10.1117/12.857184