| Names |
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, Ian S. McLean, Suzanne K. Ramsay, Hideki Takami |
| Abstract |
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. |