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Proceedings Paper

A few phenomena on the fully depleted CCDs at the engineering observation of Hyper Suprime-Cam
Author(s): Yukiko Kamata; Hidehiko Nakaya; Satoshi Kawanomoto; Satoshi Miyazaki
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Paper Abstract

We report the non-uniformity of quantum efficiency (QE) and concentric ring patterns on the images of the CCDs used in Hyper Suprime-Cam (HSC) mounted on Subaru Telescope. The non-uniformity of QE is seen as gradient patterns along the direction of the vertical resistor especially in images obtained with the g, r, and i-band filters. This is explained by non-uniformity of QE on the CCDs caused by non-uniformity of thickness of the anti-reflective coating. We confirmed this phenomena by using laboratory QE data; with the g-band filter, QE increases 1.5 % from the horizontal resistor side to vertical resistor while it decreases with the i-band filter. The concentric ring pattern is seen on uniformly illuminated images. This is caused by inhomogeneous of impurity in high resistivity silicon wafer. The fluctuation is ±0.3 % of the signal levels with the g, r, i, z, and Y-band filters.

Paper Details

Date Published: 23 July 2014
PDF: 8 pages
Proc. SPIE 9154, High Energy, Optical, and Infrared Detectors for Astronomy VI, 91541Z (23 July 2014); doi: 10.1117/12.2055763
Show Author Affiliations
Yukiko Kamata, National Astronomical Observatory of Japan (Japan)
Hidehiko Nakaya, National Astronomical Observatory of Japan (Japan)
Satoshi Kawanomoto, National Astronomical Observatory of Japan (Japan)
Satoshi Miyazaki, National Astronomical Observatory of Japan (Japan)


Published in SPIE Proceedings Vol. 9154:
High Energy, Optical, and Infrared Detectors for Astronomy VI
Andrew D. Holland; James Beletic, Editor(s)

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