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Title: Developing Ultra-low Background Sodium-Iodide Crystal Detector for Dark Matter Searches
Authors: Suerfu, FNU
Advisors: Calaprice, Frank P
Contributors: Physics Department
Keywords: Crystal growth
Dark matter
NaI (Tl) detector
Pyrolitic carbon coating
Ultra-low background
Subjects: Particle physics
Nuclear physics and radiation
Issue Date: 2018
Publisher: Princeton, NJ : Princeton University
Abstract: Astronomical and cosmological observations have established that dark matter makes up about a quarter of the Universe. While the majority of underground experiments have failed to directly detect dark matter in laboratories, DAMA/LIBRA saw an annual modulation in event rate in an array of high-purity NaI (Tl) scintillation detectors, a phenomena expected from change in the relative velocity between the Earth and the dark matter halo as the Earth orbits around the Sun. SABRE experiment aims to use ultra-high purity NaI (Tl) crystals and an active liquid scintillator veto to search for the annual modulation with sufficient sensitivity to confirm or refute the DAMA/LIBRA result. Through many years of R&D, we have successfully achieved crystal purity that has never been achieved before. We have also set up a liquid scintillator veto detector at Laboratori Nazionali del Gran Sasso (LNGS), Italy as part of a prototype detector to demonstrate the performance of low-background NaI (Tl) crystals. In this thesis, I will present in detail the key steps and processes required to grow ultra-high purity NaI (Tl) scintillating scintillator crystals and preparation of SABRE prototype detector, including assembly of crystal detector module, commissioning of the veto detector, the trigger and the data acquisition system and a detailed analysis of projected background. Although ultra-high purity NaI (Tl) crystals are developed as an essential component in resolving the annual modulation controversy, the techniques de- veloped throughout this thesis have general implications for the development of low-background detectors.
Alternate format: The Mudd Manuscript Library retains one bound copy of each dissertation. Search for these copies in the library's main catalog:
Type of Material: Academic dissertations (Ph.D.)
Language: en
Appears in Collections:Physics

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