Matrices de bolomètres supraconducteurs pour la mesure de la polarisation du fond diffus cosmologique : application à l’expérience QUBIC

Abstract : The cosmic microwave background (CMB) is the very first light of the Uni- verse and thus constitutes the oldest picture of its initial state. These photons carry valuable information constraining both the energy content and the history of the Universe. CMB observations allow us to reconstruct what occurred before the CMB anisotropies were imprinted. The most promising theoretical models all postulate an epoch of exponential expansion known as inflation just after the Big Bang. One of the major challenges of observational cosmology is hence to confirm or falsify inflation as well as to discover how inflation was realized in a particular model by searching for its imprint on the CMB polarization B-mode. This signal is however expected to be extremely weak and its detection requires a very sensitive experiment. This thesis reports on contributions to the technology development for the innovative QUBIC instrument, focusing on the perfection of an array of several hundreds of supercon- ducting bolometric detectors. A method was defined to design the detector array through tuning the relevant parameters to best meet our requirements. Then a 256- detector prototype array was fully manufactured and characterized. The preliminary characterization gave promising results for the forthcoming implementation of the QUBIC focal plane.
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Camille Perbost. Matrices de bolomètres supraconducteurs pour la mesure de la polarisation du fond diffus cosmologique : application à l’expérience QUBIC. Astrophysique [astro-ph]. Université Sorbonne Paris Cité, 2016. Français. ⟨NNT : 2016USPCC283⟩. ⟨tel-01909133⟩

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