Hyper Suprime-Cam: Characteristics Of 116 Fully Depleted Back-Illuminated Ccds

Hyper Suprime-Cam (HSC)(1,2) is a field imaging camera with the field of view (FOV) 1.5 degree diameter, which is to be installed at the prime focus of the Subaru Telescope. The large FOV is realized by the 116 2K x 4K pixels fully depleted back-illuminated CCD (FDCCD) with 15 mu m pixel square. The acceptance inspection of the CCDs started at around the end of 2009 and finished June 2011. We measured basic characteristics such as charge transfer efficiency (CTE), dark current, readout noise, linearity and the number of the dead column for all CCDs, and measured the quantum efficiency (QE) of 21 CCDs. As a result, we confirmed exceptional quality and performance for all CCDs and were able to select the best possible 166 CCDs. We also measured the flatness of each CCD at room temperature, and optimally placed them on the focal plane plate. In this paper, we report the results of the acceptance inspection and the installation process into the HSC dewar(3,4).