Laboratory simulation of Euclid-like sky images to study the impact of CCD radiation damage on weak gravitational lensing

T. Prod'homme; P. Verhoeve; T. Oosterbroek; N. Boudin; A. Short; R. Kohley

doi:10.1117/12.2054870

23 July 2014 Laboratory simulation of Euclid-like sky images to study the impact of CCD radiation damage on weak gravitational lensing

T. Prod'homme, P. Verhoeve, T. Oosterbroek, N. Boudin, A. Short, R. Kohley

Author Affiliations +

Proceedings Volume 9154, High Energy, Optical, and Infrared Detectors for Astronomy VI; 915414 (2014) https://doi.org/10.1117/12.2054870
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

Euclid is the ESA mission to map the geometry of the dark universe. It uses weak gravitational lensing, which requires the accurate measurement of galaxy shapes over a large area in the sky. Radiation damage in the 36 Charge-Coupled Devices (CCDs) composing the Euclid visible imager focal plane has already been identified as a major contributor to the weak-lensing error budget; radiation-induced charge transfer inefficiency (CTI) distorts the galaxy images and introduces a bias in the galaxy shape measurement. We designed a laboratory experiment to project Euclid-like sky images onto an irradiated Euclid CCD. In this way – and for the first time – we are able to directly assess the effect of CTI on the Euclid weak-lensing measurement free of modelling uncertainties. We present here the experiment concept, setup, and first results. The results of such an experiment provide test data critical to refine models, design and test the Euclid data processing CTI mitigation scheme, and further optimize the Euclid CCD operation.

Citation Download Citation

T. Prod'homme, P. Verhoeve, T. Oosterbroek, N. Boudin, A. Short, and R. Kohley "Laboratory simulation of Euclid-like sky images to study the impact of CCD radiation damage on weak gravitational lensing", Proc. SPIE 9154, High Energy, Optical, and Infrared Detectors for Astronomy VI, 915414 (23 July 2014); https://doi.org/10.1117/12.2054870

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