QUOTA: the prototype camera for the WIYN one degree imager (ODI)

George H. Jacoby; Steve B. Howell; Daniel R. Harbeck; David G. Sawyer

doi:10.1117/12.856662

19 July 2010 QUOTA: the prototype camera for the WIYN one degree imager (ODI)

George H. Jacoby, Steve B. Howell, Daniel R. Harbeck, David G. Sawyer

Proceedings Volume 7735, Ground-based and Airborne Instrumentation for Astronomy III; 77353D (2010) https://doi.org/10.1117/12.856662
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

QUOTA is an 8Kx8K (16'x16') optical imager using four 4Kx4K orthogonal transfer CCDs arrays (OTAs). Each OTA has 64 nearly independent CCDs having 480x494 12μm pixels. By reading out several of the CCDs rapidly (20 Hz), the centroids of the stars in those CCDs can be used to measure image motion due to atmospheric effects, telescope shake, and guide errors. Motions are fed back to the remaining 250 CCDs that continue to integrate normally, allowing a shift of the collecting charge packets so that they always fall under the moving star images, thereby effecting low order adaptive optics tip/tilt correction in the silicon to improve image quality. As a bonus, the stars that are read rapidly can be studied for high speed photometric variability. QUOTA was conceived to be a prototype for WIYN's 32Kx32K One Degree Imager (ODI), providing a means to test and advance the technical developments for the larger imager (e.g., detectors, controllers, optics, coatings, cooling, and software). QUOTA will have been to the WIYN 3.5-m telescope only twice in its current configuration, but it provided a wealth of information that has been useful to the engineering of ODI. We focus on the areas in which ODI has benefited from QUOTA in this report.

Citation Download Citation

George H. Jacoby, Steve B. Howell, Daniel R. Harbeck, and David G. Sawyer "QUOTA: the prototype camera for the WIYN one degree imager (ODI)", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77353D (19 July 2010); https://doi.org/10.1117/12.856662

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