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Nouveau spectro-imageur CdTe à très haute résolution spatiale et spectrale pour l'astronomie X et gamma

Abstract : The thesis work presented in the manuscript corresponds to the first development phase of the MC2 project, an ambitious R & D effort to realize a new type of CdTe-based imaging spectrometer for future hard X- and gamma-rays astronomy missions. The objective is to achieve a 300 micron-pitch pixelated detector plane hybrided with a very low noise front-end electronics for a total pixel density multiplied by 4 compared to the most advanced system recently available in the laboratory (Caliste HD module). Moreover, thanks to the joint development of reading circuits adapted to the interconnection of pixelated detectors with low capacitance and low leakage current, spectroscopic performances of such system are assumed to approach inherent limitations of the CdTe detector, specifically for the lowest energies. My work was organized in parallel and complementary areas: evaluation of current systems, feedback and identification of issues associated with the development of highly-resolved detection planes, implementation and complete characterization of a new two-dimensional ASIC specifically developed for this application, and modelling and study of the associated sensor to optimize the design of the detector pattern. Finally, a first hybrid prototype was completed and first experimental tests thereby conducted.
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Submitted on : Tuesday, January 28, 2020 - 11:39:51 AM
Last modification on : Monday, December 13, 2021 - 9:15:03 AM
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Sebastien Dubos. Nouveau spectro-imageur CdTe à très haute résolution spatiale et spectrale pour l'astronomie X et gamma. Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]. Université Sorbonne Paris Cité; Université Paris 7 - Denis Diderot; Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA); Centre National d'Etudes Spatiales (CNES), 2015. Français. ⟨NNT : 2015USPCC159⟩. ⟨tel-02457677⟩



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