9 August 2016 VIRUS characterization development and results from first batches of delivered units
Author Affiliations +
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. Each spectrograph has its own 2kx2k CCD detector with 15 micron pixels. Following alignment, the final stage prior to deployment of each unit is characterization of the 156 spectrograph channels and their CCDs. We describe the laboratory calibration system and scripting that automates this process. Both fiber and continuous (non-spatially modulated) input slits are utilized. Photon transfer curves are made to measure the gain and read noise of each CCD. Pixel flats are also made to correct for pixel-to-pixel QE variations. Relative throughput measurements of each unit are made using the same lab fiber bundle for consistency, and fiber profiles are characterized for later use by the CURE data reduction package. Replicable unit instruments provide a cost effective solution for scaling up instruments for large and extremely large class telescopes. Because VIRUS is the first massively replicated instrument, we have the opportunity to examine the end result of variations in the manufacturing processes that go into production. This paper presents the characterization setup for VIRUS units and compares the performance and variability of processed units with specifications for HETDEX.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Briana L. Indahl, Briana L. Indahl, Gary J. Hill, Gary J. Hill, Niv Drory, Niv Drory, Karl Gebhardt, Karl Gebhardt, Sarah Tuttle, Sarah Tuttle, Jason Ramsey, Jason Ramsey, Greg Ziemann, Greg Ziemann, Taylor Chonis, Taylor Chonis, Trent Peterson, Trent Peterson, Andrew Peterson, Andrew Peterson, Brian L. Vattiat, Brian L. Vattiat, Huan Li, Huan Li, Lei Hao, Lei Hao, } "VIRUS characterization development and results from first batches of delivered units", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990880 (9 August 2016); doi: 10.1117/12.2231915; https://doi.org/10.1117/12.2231915
PROCEEDINGS
16 PAGES


SHARE
RELATED CONTENT

Recent advances with WYFFOS
Proceedings of SPIE (July 08 1998)
Multiple Object Fiber Optic Spectroscopy
Proceedings of SPIE (November 15 1982)
SARG: the high-resolution spectrograph of TNG
Proceedings of SPIE (March 20 1997)
Theme On Two Wide-Coverage Spectrograph Cameras
Proceedings of SPIE (October 12 1986)
The MagE spectrograph
Proceedings of SPIE (July 10 2008)

Back to Top