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Large synoptic survey telescope : distorsions électrostatiques dans les ccd

Abstract : The removal of the sensor signature in the science images has been identified by the LSST Dark Energy Science Collaboration as a mandatory path to fullfill its scientific goals. The SAWG working group has been put together to perform this task for the collaboration. It has access to optical benches in some of the laboratories of the collaboration (UC Davis, SLAC, BNL and LPNHE) for this purpose. LSST belongs to a new category of telescopes equiped with large focal planes. For the decade that they have been equipped with thick, high resistivity Charge Coupled Devices (CCD), new effects have been identified. A particular attention is given to the understanding of the electrostatic distortions that are inherent to the CCD properties. These electrostatic distortions have an impact on science measurements. My PhD work is centered on the study of the brighter-fatter effect and the tree-rings. It has been shown that with different kind of illuminations, it was possible to accurately characterize these effects. A fringe projector has been developed on the optical bench of the LPNHE in order to produce these particular illuminations. In this document, we present : a new method, tested on simulations, to characterize the tree-rings; a new method to measure the brighter-fatter effect based on the projection of Ronchi profiles; a complete study of the different properties of the brighter-fatter effect, where we developped a simplified electrostatic model. Finally, the efficiency of a correction method, called descrambling, is evaluated.
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Submitted on : Thursday, March 1, 2018 - 11:40:09 AM
Last modification on : Saturday, August 29, 2020 - 3:36:15 AM
Long-term archiving on: : Wednesday, May 30, 2018 - 1:06:05 PM


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  • HAL Id : tel-01720422, version 1


Rémy Le Breton. Large synoptic survey telescope : distorsions électrostatiques dans les ccd. Physique des Hautes Energies - Expérience [hep-ex]. Université Pierre et Marie Curie - Paris VI, 2017. Français. ⟨NNT : 2017PA066298⟩. ⟨tel-01720422⟩



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