Investigation of Fractures as a Background in Rare-Event Searches
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Authors
Squibb, Robert
Date
Type
thesis
Language
eng
Keyword
Fractures , Dark Matter , Rare-Event Searches , Backgrounds
Alternative Title
Abstract
Rare-event searches in particle physics put immense effort into precisely controlling their backgrounds.
However, not always considered is the effect of fractoluminescence if the active material
fractures. The effect of atmosphere on the fractoluminescence of the scintillator BGO (Bi4Ge3O12)
has been studied by stressing samples in a double-cleavage drilled compression (DCDC) geometry
to fracture. A system has been developed to fracture samples in a controllable atmosphere and analyze
the light and acoustic emissions. By analyzing the fracture of BGO, it has been demonstrated
that the force required and the energy dissipated in fracture are increased as the water vapour in
the atmosphere is reduced. It has also been demonstrated that the quantity of emitted photons
increases in nitrogen rich atmospheres. These results demonstrate the importance of controlling
both the atmosphere and stresses inside particle detectors. In addition, in order to study the effect
of cryogenic temperature on fractures in particle detectors, a microfabricated polysilicon fracture
apparatus has been designed and subjected to first tests.
Description
Citation
Publisher
License
CC0 1.0 Universal
Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada
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.
Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada
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.