Étude et simulation de la lumière de scintillation produite et se propageant dans une chambre à dérive double-phase à argon liquide, dans le contexte du projet DUNE

Abstract : DUNE is a future long-baseline neutrino experiment designed to determine, among others, the neutrino mass hierarchy and to measure the CP violation phase that enters the neutrino oscillation process. This project is based on a 1300 km long high intensity neutrino beam and a massive detector containing more than 40 kilotons of liquid argon using the liquid argon time projection chamber technology (LArTPC). Two approaches of this technology are currently under development, leading to the construction of two prototypes to be in place at the end of 2018 at CERN. The work of this thesis is part of the ProtoDUNE-DP project, which aims at probing the capabilities of the so-called “dual-phase” technology, that uses both gaseous and liquid argon, for a large-scale detector. Two kind of signals, a charge signal and a scintillation light signal, are expected in a LArTPC. The light signal can be used as a trigger, for the identification and rejection of the cosmic background, and for precise calorimetric measurements. Prior simulations of this signal are needed in order to improve our understanding of the scintillation light signal and to develop the identification algorithms. This work addresses the development of this simulation and the study of the scintillation photon behavior in the liquid argon detector. The different scintillation light production mechanisms, the developed simulation and the different studies on the light propagation in ProtoDUNE-DP are presented. These simulations have also been compared with light data taken at CERN in 2017 with a first demonstrator, in order to validate and tune the simulation.
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Anne Chappuis. Étude et simulation de la lumière de scintillation produite et se propageant dans une chambre à dérive double-phase à argon liquide, dans le contexte du projet DUNE. Physique Nucléaire Théorique [nucl-th]. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAY068⟩. ⟨tel-02146587⟩

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