Calibration Of The Dark Energy Survey Camera: Measurements Of Focal Plane Flatness And Crosstalk Among CCDs

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DECam is an extremely red sensitive 520 Megapixel camera designed for the incoming Dark Energy Survey (DES). It is consist of sixty two 4k x 2k and twelve 2k x 2k 250-micron thick fully-depleted CCDs, with a focal plane of 44 cm in diameter and a field of view of 2.2 square degree. It will be attached to the Blanco 4-meter telescope at CTIO. The DES will cover 5000 square-degrees of the southern galactic cap in 5 color bands (g, r, i, z, Y) in 5 years starting from 2011. We present our techniques for measuring the flatness of the focal plane and the crosstalk among CCDs for theDECam. We developed an image based technique to measure the flatness by moving and matching a projected grid pattern across the focal plane. The flatness is then determined by the variation of the grid pattern. We measure the crosstalk by shotting laser spots on every CCD and look at the crosstalk on other CCDs. The results show the crosstalk are well within the DES specification.

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