An Electro - Optical Test System for Optimising Operating Conditions of CCD sensors for LSST

TL;DR

This paper presents a specialized electro-optical test system designed to optimize CCD sensor operation for the LSST telescope, including calibration and gain optimization under various conditions.

Contribution

It introduces a new low-vibration, high-stability test system capable of diverse illumination modes and provides insights into gain calibration and optimization for CCDs affected by the brighter-fatter effect.

Findings

Optimized CCD gain and full well capacity through substrate bias and clock level adjustments.

Compared gain calibration methods for CCDs with brighter-fatter effect.

Developed a stable, versatile test system for CCD characterization.

Abstract

We describe the commissioning of a system which has been built to investigate optimal operation of CCDs for the LSST telescope. The test system is designed for low vibration, high stability operation and is capable of illuminating a detector in flat-field, projected spot, projected pattern and Fe-55 configurations. We compare and describe some considerations when choosing a gain calibration method for CCDs which exhibit the brighter-fatter effect. An optimisation study on a prototype device of gain and full well with varying back substrate bias and gate clock levels is presented.