Image Sensors for Precision Astronomy (ISPA 2024)

Mitigation of the Brighter-Fatter Effect in the LSST Camera

Mar 13, 2024, 9:20 AM

25m

48/1-112C/D - Redwood C/D (SLAC)

Oral presentation (20 minute) Software/Algorithms for Precision Astronomy Software & Algorithms

Speaker

Alexander Broughton (University of California, Irvine)

Description

Thick, fully depleted charge-coupled devices (CCDs) are known to exhibit non-linear behavior at high signal levels due to the dynamic behavior of charges collecting in the potential wells of pixels, called the brighter-fatter effect (BFE). This particularly impacts bright calibration stars, which appear larger than their intrinsic shape, creating a flux-dependent point-spread function (PSF) that if left unmitigated, could make up a large fraction of the error budget in Stage IV weak-lensing (WL) surveys such as the Legacy Survey of Space and Time (LSST). In this presentation, we will discuss the latest characterizations of the BFE in the LSST camera from lab images of flat-fields and artificial stars and discuss the current state-of-the-art correction algorithms.

Keywords for your contribution subject matter (this will assist SOC in accurately characterizing your contribution)

First author of recent paper on this topic.
"Mitigation of the Brighter-Fatter Effect in the LSST Camera" (Broughton et. al 2023)

Presentation materials

ISPA2024_ Mitigation of the BFE in LSSTCam.pdf

ispa24_240312-14_broughton.mp4