Astronomical Camera Based on a CCD261-84 Detector with Increased Sensitivity in the Near-Infrared

TL;DR

This paper presents a new astronomical camera system based on a CCD detector with increased near-infrared sensitivity, low fringe amplitude, and optimized for use at the Russian 6 m telescope.

Contribution

The paper introduces a CCD-based astronomical camera with enhanced near-infrared sensitivity and reduced fringe patterns, suitable for advanced spectral and imaging observations.

Findings

Significantly lower fringe amplitude compared to previous detectors

Enhanced sensitivity in the 800-1000 nm spectral range

Successful implementation at the Russian 6 m telescope

Abstract

Herein, we describe the design, implementation and operation principles of an astronomical camera system, based on a large-format CCD261-84 detector with an extremely thick 200 mkm substrate. The DINACON-V controller was used with the CCD to achieve high performance and low noise. The CCD system photometric characteristics are presented. A spatial autocorrelation analysis of flat-field images was performed to reveal the dependence of substrate voltage on the lateral charge spreading. The investigation of the dispersion index for the optimal choice of exposure time is discussed. Studies of the patterns of fringes were carried out in comparison with previous detectors. The amplitude of fringes with CCD261-84 was significantly lower, compared to previous-generation detectors. The results of using a new camera for imaging and spectral observations at the Russian 6 m telescope with the SCORPIO-2 multimode focal reducer are considered. The developed CCD camera system makes it possible to significantly increase the sensitivity in the 800-1000 spectral range.