20 July 2010 The upgraded WIYN bench spectrograph
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We present the as-built design overview and post-installation performance of the upgraded WIYN Bench Spectrograph. This Bench is currently fed by either of the general-use multi-fiber instruments at the WIYN 3.5m telescope on Kitt Peak, the Hydra multi-object positioner, and the SparsePak integral field unit (IFU). It is very versatile, and can be configured to accommodate low-order, echelle, and volume phase holographic gratings. The overarching goal of the upgrade was to increase the average spectrograph throughput by ~60% while minimizing resolution loss (< 20%). In order to accomplish these goals, the project has had three major thrusts: (1) a new CCD was provided with a nearly constant 30% increase is throughput over 320-1000 nm; (2) two Volume Phase Holographic (VPH) gratings were delivered; and (3) installed a new all-refractive collimator that properly matches the output fiber irradiance (EE90) and optimizes pupil placement. Initial analysis of commissioning data indicates that the total throughput of the system has increased 50-70% using the 600 l/mm surface ruled grating, indicating that the upgrade has achieved its goal. Furthermore, it has been demonstrated that overall image resolution meets the requirement of <20% loss.
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Patricia M. Knezek, Matthew A. Bershady, Daryl Willmarth, John Glaspey, Gary Poczulp, Dan Blanco, Lana Britanik, Eugene McDougall, Charles Corson, Ming Liang, Joe Keyes, George Jacoby, "The upgraded WIYN bench spectrograph", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77357D (20 July 2010); doi: 10.1117/12.857648; https://doi.org/10.1117/12.857648

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