Sensor Characterization and Fiducial Volume Studies for the NEWS-G Dark Matter Experiment
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Authors
Savvidis, Georgios
Date
Type
thesis
Language
eng
Keyword
Dark Matter , NEWS-G , Spherical Proportional Counter , SPC , WIMPs , Direct Detection , Achinos , Linearity , LSM , pure methane , fiducial volume , sensor , SNOLAB , Stability , Gain , neon , argon
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Abstract
The evidence of dark matter from astrophysical and cosmological observations has led to the development of various detectors searching for the elusive matter. The NEWS-G detector, exploiting its low-energy threshold, has been implemented in the search for low-mass dark matter at sub-GeV masses. The development of the multi-anode \emph{achinos} sensor has enabled the detector for the low threshold in large volume SPCs thanks to the high electric field providing efficient charge collection at large distances from the center and high avalanche amplification. Two different achinos models were characterized and compared, selecting the one best suiting the experiment for dark matter search at SNOLAB. Before the SNOLAB installation, the detector was installed at LSM (Laboratoire Souterrain de Modane) where physics data were obtained in 135 mbar pure methane, thus taking advantage of the nuclear recoils on protons. Estimation of the fiducial volume was required to determine the final target mass of the detector and was achieved from \ce{^{37}Ar} calibrations. Currently, the NEWS-G detector is installed and operating at SNOLAB, undergoing background calibrations and noise reduction, and will soon begin its physics runs using neon-methane mixtures.
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ProQuest PhD and Master's Theses International Dissemination Agreement
Intellectual Property Guidelines at Queen's University
Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.