24 July 2008 The 123 mm 8k×3k e2v/Ohio State CCD231-68 for MODS
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Abstract
As is only fitting, the largest Optical/Infrared Telescope (the Large Binocular Telescope, LBT) has the two largest telescope-mounted spectrographs (MODS) and the MODS's have the four largest scientific CCDs. We describe herein the design, fabrication and early use of the e2v CCD231-68 8k × 3k 15 micron back-illuminated detector designed specifically for low and intermediate resolution multi-object spectroscopy on large telescopes. The 123 mm length of the CCD231-68 is the largest of any scientific CCD. The device can be read out in full frame mode to cover the whole 6 arc-min slit length of MODS, in full frame mode for multi-object spectroscopy with short slits, or in split frame transfer mode to allow readout while integrating subsequent exposures. The four very low noise (<2 e- RMS at 100 kPixels/second) outputs are located at the ends of the four 4k serial registers. Excellent CTE (five-9s5 per Pixel) insures good photometric accuracy across the device. Backthinned red and blue optimized variants are used on the corresponding channels of both MODS.
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Bruce Atwood, Paul Jorden, Peter Pool, "The 123 mm 8k×3k e2v/Ohio State CCD231-68 for MODS", Proc. SPIE 7021, High Energy, Optical, and Infrared Detectors for Astronomy III, 702108 (24 July 2008); doi: 10.1117/12.789169; https://doi.org/10.1117/12.789169
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