Determination of Charge Diffusion in Nancy Grace Roman Space Telescope Detectors
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Date
2025-05
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The Ohio State University
Abstract
The Nancy Grace Roman Space Telescope is an observatory motivated by the search to understand dark energy, find exoplanets, and expand general astrophysics. Roman will bring unprecedented amounts of precision to weak gravitational lensing measurements, which necessitates a developed understanding of systematic errors. This motivates efforts to understand the intrinsic features of the infrared detectors, building a comprehensive understanding of sources of error, and allowing for optimal measurements of cosmological behaviors. One such feature is the modulation transfer function (MTF) which includes contributions from charge diffusion, a description of how charges move through the detector and smear images. Using data from a structured light experiment performed on the detectors, we collected MTF measurements in several wavelengths to produce a comprehensive, robust model of charge diffusion in the Roman detectors. The model informs survey strategy for weak lensing measurements and included in simulations used to develop software for the Roman mission.
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Cosmology, Modulation Transfer Function, Charge Diffusion, Detectors