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Optimization of spherical proportional counter backgrounds and response for low mass dark matter search

Abstract : The spherical proportional counters have been used by the NEWS-G collaboration since 2013 for dark matter search with the SEDINE detector installed at the Laboratoire Souterrain de Modane. This first detector allowed for establishing a new limit on the WIMP-nucleon cross section for WIMPs of mass less than 0.6 GeV/c². Since then, the collaboration has been working on the development of a new detector. This thesis focuses on two improved aspects of the second detector. The study of the background observed by SEDINE led to the conclusion that it is dominated by the presence of Pb²¹⁰ decay chain on the surfaces and in the materials making up the detector and its shielding. This allowed for the selection of materials and manufacturing methods to reduce the background noise of the next detector. The second development concerns the detector anode. Placed in the center of the sphere, the anode ensures the formation of the signal. The latest developments show the ability of this component to ensure the detection of single electrons while being stable and with good resolution. This study made it possible to develop a new generation of detector which will be installed at SNOLAB in 2020.
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Submitted on : Thursday, August 27, 2020 - 11:08:11 AM
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  • HAL Id : tel-02923528, version 1

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Alexis Brossard. Optimization of spherical proportional counter backgrounds and response for low mass dark matter search. Instrumentation and Detectors [physics.ins-det]. Université Paris-Saclay; Queen's university at Kingston, 2020. English. ⟨NNT : 2020UPASS041⟩. ⟨tel-02923528⟩

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