META-2022

Characterization of a deep-depletion 4K x 4K CCD Detector System designed for ADFOSC

Not scheduled

20m

IIA Bangalore

Speaker

Dimple Dimple (ARIES, Nainital)

Description

We present a detailed characterization of a CCD detector system developed for the ADFOSC instrument of the 3.6m DOT. During its development, various experiments were performed in a dark room to tune the CCD controller parameters to obtain optimum performance in single and four-port readout modes. We employed different methodologies for characterizing the performance parameters of the CCD, including bias stability, noise, defects, linearity, and gain. The CCD has grade-0 characteristics at temperatures close to operating temperature ($-{120}^{\circ }$C). The overall system is linear with a regression coefficient of 0.9999, readout noise of 6 electrons and a gain value close to unity. We introduced a new method to calculate the dark signal using the gradient seen in the bias frames at temperatures below $-{35}^{\circ }$C. Using the optimized setting, we verified the performance of the CCD detector system on-sky using the ADFOSC instrument mounted on 3.6m telescope. Later, we observed specific science targets and transients to evaluate the detector's performance in both imaging and spectroscopic modes.