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Proceedings Paper

WIYN bench upgrade: a revitalized spectrograph
Author(s): M. Bershady; S. Barden; P.-A. Blanche; D. Blanco; C. Corson; S. Crawford; J. Glaspey; S. Habraken; G. Jacoby; J. Keyes; P. Knezek; P. Lemaire; M. Liang; E. McDougall; G. Poczulp; D. Sawyer; K. Westfall; D. Willmarth
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Paper Abstract

We describe the redesign and upgrade of the versatile fiber-fed Bench Spectrograph on the WIYN 3.5m telescope. The spectrograph is fed by either the Hydra multi-object positioner or integral-field units (IFUs) at two other ports, and can be configured with an adjustable camera-collimator angle to use low-order and echelle gratings. The upgrade, including a new collimator, charge-coupled device (CCD) and modern controller, and volume-phase holographic gratings (VPHG), has high performance-to-cost ratio by combining new technology with a system reconfiguration that optimizes throughput while utilizing as much of the existing instrument as possible. A faster, all-refractive collimator enhances throughput by 60%, nearly eliminates the slit-function due to vignetting, and improves image quality to maintain instrumental resolution. Two VPH gratings deliver twice the diffraction efficiency of existing surface-relief gratings: A 740 l/mm grating (float-glass and post-polished) used in 1st and 2nd-order, and a large 3300 l/mm grating (spectral resolution comparable to the R2 echelle). The combination of collimator, high-quantum efficiency (QE) CCD, and VPH gratings yields throughput gain-factors of up to 3.5.

Paper Details

Date Published: 9 July 2008
PDF: 12 pages
Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70140H (9 July 2008); doi: 10.1117/12.789112
Show Author Affiliations
M. Bershady, Univ. of Wisconsin, Madison (United States)
S. Barden, Anglo-Australian Observatory (Australia)
P.-A. Blanche, Ctr. Spatial de Liège (Belgium)
D. Blanco, National Optical Astronomical Observatory (United States)
C. Corson, National Optical Astronomical Observatory (United States)
WIYN Observatory (United States)
S. Crawford, Univ. of Wisconsin, Madison (United States)
J. Glaspey, National Optical Astronomical Observatory (United States)
S. Habraken, Ctr. Spatial de Liège (Belgium)
G. Jacoby, National Optical Astronomical Observatory (United States)
WIYN Observatory (United States)
J. Keyes, Univ. of Wisconsin, Madison (United States)
P. Knezek, National Optical Astronomical Observatory (United States)
WIYN Observatory (United States)
P. Lemaire, Ctr. Spatial de Liège (Belgium)
M. Liang, National Optical Astronomical Observatory (United States)
E. McDougall, National Optical Astronomical Observatory (United States)
WIYN Observatory (United States)
G. Poczulp, National Optical Astronomical Observatory (United States)
D. Sawyer, National Optical Astronomical Observatory (United States)
K. Westfall, Univ. of Wisconsin, Madison (United States)
D. Willmarth, National Optical Astronomical Observatory (United States)


Published in SPIE Proceedings Vol. 7014:
Ground-based and Airborne Instrumentation for Astronomy II
Ian S. McLean; Mark M. Casali, Editor(s)

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