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6 July 2018 The WIYN one degree imager in 2018: an extended 30-detector focal plane
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We report on the upgraded One Degree Imager (ODI) at the WIYN 3.5 meter telescope at the Kitt Peak Observatory after the focal plane was expanded by an additional seventeen detectors in spring 2015. The now thirty Orthogonal Transfer Array CCD detectors provide a total field of view of 40’ x 48’ on the sky. The newly added detectors underwent a design revision to mitigate reduced charge transfer efficiency under low light conditions. We discuss the performance of the focal plane and challenges in the photometric calibration of the wide field of view, helped by the addition of telescope baffles. In a parallel project, we upgraded the instrument’s three filter arm mechanisms, where a degrading worm-gear mechanism was replaced by a chain drive that is operating faster and with high reliability. Three more filters, a u’ band and two narrow band filters were added to the instrument’s complement, with two additional narrow band filters currently in procurement (including an Hα filter). We review the lessons learned during nearly three years of operating the instrument in the observatory environment and discuss infrastructure upgrades that were driven by ODI’s needs.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Daniel R. Harbeck, Mike Lesser, Wilson Liu, Bob Stupak, Ron George, Ron Harris, Gary Poczulp, Jayadev Rajagopal, Ralf Kotulla, David Ouellete, Eric J. Hooper, Michael Smith, Dustin Mason, Peter Onaka, Greg Chin, Emily Hunting, and Robert Christensen "The WIYN one degree imager in 2018: an extended 30-detector focal plane", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070229 (6 July 2018);

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