Download the full-sized PDF of Analysis of the Afterpulsing and the Dark Noise Spectrum From the DEAP-3600 DetectorDownload the full-sized PDF



Permanent link (DOI):


Export to: EndNote  |  Zotero  |  Mendeley


This file is in the following communities:

Graduate Studies and Research, Faculty of


This file is in the following collections:

Theses and Dissertations

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


Other title
Weakly Interacting Massive Particle
Dark noise
Type of item
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 of Physics

Date accepted
Graduation date
Master of Science
Degree level
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.
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.
Citation for previous publication

File Details

Date Uploaded
Date Modified
Audit Status
Audits have not yet been run on this file.
File format: pdf (Portable Document Format)
Mime type: application/pdf
File size: 9399746
Last modified: 2016:06:24 18:36:33-06:00
Filename: Singhrao_Kamal_201509_MSc.pdf
Original checksum: c3e32a109368bd27f0b63ee529ac738e
Well formed: true
Valid: false
Status message: Invalid destination object offset=9337234
Status message: Invalid destination object offset=9339541
Status message: Invalid destination object offset=9337439
Status message: Invalid destination object offset=9339642
Status message: Invalid destination object offset=9337089
File title: Introduction
Page count: 87
Activity of users you follow
User Activity Date