Origins and analysis of nonlinear crosstalk in the Rubin Observatory LSST Camera

Daniel Polin; Adam K. Snyder; J. Anthony Tyson

doi:10.1117/12.3020506

27 August 2024 Origins and analysis of nonlinear crosstalk in the Rubin Observatory LSST Camera

Daniel Polin, Adam K. Snyder, J. Anthony Tyson

Author Affiliations +

Proceedings Volume 13103, X-Ray, Optical, and Infrared Detectors for Astronomy XI; 131031Z (2024) https://doi.org/10.1117/12.3020506
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The Rubin Observatory LSST Camera exhibits novel crosstalk between CCD amplifier segments that does not scale linearly with intensity as we would expect from capacitive coupling alone. Illuminating with images of satellite streaks and stars, we create realistic crosstalk sources and images in science-grade LSST CCDs. We use a custom-made electronics board that simulates the load of a CCD to inject proxy video signals directly into Rubin LSST Camera readout electronics board to isolate the sources and shape of crosstalk and its nonlinearity. We discuss possible mechanisms for the origin of this nonlinear crosstalk in the camera and how it may be partially corrected in the main survey by making changes to the correlated double sampler timing in the camera readout. We show that crosstalk nonlinearity originates at least in part from the readout electronics and the correlated double sampler (CDS) in particular. We show that increasing CDS ramp time will decrease crosstalk nonlinearity.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Daniel Polin, Adam K. Snyder, and J. Anthony Tyson "Origins and analysis of nonlinear crosstalk in the Rubin Observatory LSST Camera", Proc. SPIE 13103, X-Ray, Optical, and Infrared Detectors for Astronomy XI, 131031Z (27 August 2024); https://doi.org/10.1117/12.3020506

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