8 July 2014 The WIYN one degree imager 2014: performance of the partially populated focal plane and instrument upgrade path
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The One Degree Imager (ODI) was deployed during the summer of 2012 at the WIYN 3.5m telescope, located on Kitt Peak near Tucson, AZ (USA). ODI is an optical imager designed to deliver atmosphere-limited image quality (≤ 0.4” FWHM) over a one degree field of view, and uses Orthogonal Transfer Array (OTA) detectors to also allow for on-chip tip/tilt image motion compensation. At this time, the focal plane is partially populated (”pODI”) with 13 out of 64 OTA detectors, providing a central scientifically usable field of view of about 24′ x 24′; four of the thirteen detectors are installed at outlying positions to probe image quality at all field angles. The image quality has been verified to be indeed better than 0.4′′ FWHM over the full field when atmospheric conditions allow. Based on over one year of operations, we summarize pODIs performance and lessons learned. As pODI has proven the viability of the ODI instrument, the WIYN consortium is engaging in an upgrade project to add 12 more detectors to the focal plane enlarging the scientifically usable field of view to about 40′ x 40′. A design change in the new detectors has successfully addressed a low light level charge transfer inefficiency.
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Daniel R. Harbeck, Daniel R. Harbeck, Todd Boroson, Todd Boroson, Michael Lesser, Michael Lesser, Jayadev Rajagopal, Jayadev Rajagopal, Andrey Yeatts, Andrey Yeatts, Charles Corson, Charles Corson, Wilson Liu, Wilson Liu, Ian Dell'Antonio, Ian Dell'Antonio, Ralf Kotulla, Ralf Kotulla, David Ouellette, David Ouellette, Eric Hooper, Eric Hooper, Mike Smith, Mike Smith, Richard Bredthauer, Richard Bredthauer, Pierre Martin, Pierre Martin, Gary Muller, Gary Muller, Patricia Knezek, Patricia Knezek, Mark Hunten, Mark Hunten, "The WIYN one degree imager 2014: performance of the partially populated focal plane and instrument upgrade path", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91470P (8 July 2014); doi: 10.1117/12.2056651; https://doi.org/10.1117/12.2056651


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