Performance Evaluation of the SBIG Aluma AC4040 FSI sCMOS Detector at Bosscha Observatory Muhammad Zakky Aprianizar, Muhammad Yusuf, Dhimaz Gilang Ramadhan
Bosscha Observatory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia
*aprianizakky13[at]gmail.com
Abstract
We present preliminary results from the performance evaluation of the SBIG Aluma AC4040 FSI sCMOS detector, carried out in preparation for its integration with the LKBF-ITB telescope system currently under development at Bosscha Observatory. Key detector parameters were evaluated. Using the photon transfer curve, we measured gain values of \(0.973 \pm 0.002 \, \mathrm{e}^{-}/\mathrm{ADU}\) in high gain and \(19.896 \pm 0.155 \, \mathrm{e}^{-}/\mathrm{ADU}\) in low gain mode, with corresponding readout noise levels of \(3.837 \pm 0.977 \, \mathrm{e}^{-}\) and \(29.227 \pm 2.646 \, \mathrm{e}^{-}\). At \(0^{\circ}\)C, the detector exhibited stable RMS bias levels of \(91.399 \pm 0.012\) ADU in high gain and \(88.498 \pm 0.007\) ADU in low gain mode. Dark current rates were measured at \(0.23 \pm 0.002 \, \mathrm{e}^{-} /\mathrm{px} /\mathrm{s}\) and \(0.277 \pm 0.004 \, \mathrm{e}^{-} /\mathrm{px} /\mathrm{s}\) for high and low gain, respectively. These results show strong agreement with the manufacturer specifications and confirm the potentials of the detector for astronomical imaging. Further on-sky testing will be conducted to evaluate performance under operational observing conditions.
