Measuring the Quantum Efficiency of X-Ray Hybrid CMOS Detectors

Abstract

Next-generation X-ray observatories, such as the Lynx X-ray Observatory Mission Concept, will require detectors with high quantum efficiency (QE) across the soft X-ray band to observe the faint objects that drive their mission science cases. Hybrid CMOS Detectors (HCDs), a form of active-pixel sensor, are promising candidates for use on these missions because of their faster read-out, lower power consumption, and greater radiation hardness than detectors used in the current generation of X-ray telescopes. In this work, we present QE measurements of a Teledyne H2RG HCD. These measurements were performed using a gas-flow proportional counter as a reference detector to measure the absolute flux incident on the HCD. We find an effective QE of $95.0\pm 1.1\%$ at the Mn K$\alpha$/K$\beta$ lines (at 5.9 and 6.5 keV), $98.5\pm 1.8\%$ at the Al K$\alpha$ line (1.5 keV), and $85.0\pm 2.8\%$ at the O K$\alpha$ line (0.52 keV).

11 pages, 8 figures, appears in Proc. SPIE 2021

References in corpus (2)

• Overview of the High-Definition X-ray Imager instrument on the Lynx x-ray surveyor
• Hybrid CMOS detectors for the Lynx x-ray surveyor high definition x-ray imager

Cited by in corpus (1)

• Measuring the Soft X-Ray Quantum Efficiency of a Hybrid CMOS Detector