Characteristics of four thinned TI 800 X 800 CCDs

Astronomy and Astrophysics – Astronomy

Scientific paper

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Charge Coupled Devices, Electrophotometers, Imaging Techniques, Quantum Efficiency, Cosmic Rays, Infrared Photometry, Ultraviolet Photometry, Visual Photometry

Scientific paper

Four CCD imaging sensors manufactured by Texas Instruments have been optimized and characterized for use from 3000 A to 10,000 A. They are 800 x 800-pixel arrays that have been thinned and UV-flooded and yield quantum efficiencies that are close to the reflection limit for silicon. Readout noise values of 6.2 to 6.8 electrons rms are obtained for three of the four devices. A dark current of 20 electrons per pixel per hour is obtainable by cooling the CCDs to -140 C, while operating them in inversion mode can give a dark current as low as 2 electrons per pixel per hour. The conversion gain, full well, and cosmetics of each sensor are discussed. The detection rate of cosmic rays and the distribution of the number of detected electrons per cosmic ray is in good agreement with theory, indicating that there are no local source of radioactivity.

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