WIYN bench upgrade: a revitalized spectrograph

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

doi:10.1117/12.789112

9 July 2008 WIYN bench upgrade: a revitalized spectrograph

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

Author Affiliations +

Proceedings Volume 7014, Ground-based and Airborne Instrumentation for Astronomy II; 70140H (2008) https://doi.org/10.1117/12.789112
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

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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, and D. Willmarth "WIYN bench upgrade: a revitalized spectrograph", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70140H (9 July 2008); https://doi.org/10.1117/12.789112

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