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Permanent link (DOI): https://doi.org/10.7939/R3Q814Z0Q

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Analysis of the Afterpulsing and the Dark Noise Spectrum From the DEAP-3600 Detector Open Access

Descriptions

Other title
Subject/Keyword
Weakly Interacting Massive Particle
DEAP-3600
Dark noise
Afterpulsing
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Singhrao, Kamal
Supervisor and department
Retiere, Fabrice (Physics)
Grant, Darren (Physics)
Examining committee member and department
Grant, Darren (Physics)
Hallin, Aksel (Physics)
Retiere, Fabrice (Physics)
Sivakoff, Gregory (Physics)
Department
Department of Physics
Specialization

Date accepted
2015-09-30T11:35:29Z
Graduation date
2015-11
Degree
Master of Science
Degree level
Master's
Abstract
The DEAP-3600 experiment is a 3,600 kg Liquid Argon (LAr) target scintillation detector designed to detect the Weakly Interacting Massive Particle (WIMP) dark matter candidate. The detector works by detecting photons released by nuclear recoils of Argon nuclei, using an array of 255 nearly isotropically placed photomultiplier tubes (PMTs). The detector electronics system then digitizes the pulse detected by the PMTs and is designed to maximize discrimination between single and multiple photon pulses. The data processing chain is completed with an offline processor that discriminates the dominant Ar-39 induced beta decay background from nuclear recoil induced hits pulsing pulse shaped discrimination (PSD). Each PMT has an intrinsic level of background caused by dark noise and afterpulsing that can potentially create anomalous signals in the WIMP region of interest. Dark noise is caused by photoelectrons being spontaneously emitted from the PMT photocathode material and afterpulsing is typically caused by the residual gas ions inside the PMT that drift and strike the photocathode resulting in the emission of many photoelectrons. This thesis introduces a method to characterize the levels of PMT afterpulsing and dark noise in the DEAP-3600 detector. Presented is a discussion of the implications of the resultant PMT background for the WIMP search during the detector physics data running.
Language
English
DOI
doi:10.7939/R3Q814Z0Q
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File title: Introduction
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