Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706619
Title: Neutral particle detection methods using Noble gases in LAGUNA-LBNO and MODES-SNM
Author: Stainer, Thomas
ISNI:       0000 0004 6058 0174
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2015
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Abstract:
Neutral particles, particularly neutrons, gammas and neutrinos are difficult to detect and measure due to their lack of electric charge. Noble fluids are a powerful medium when detecting such particles due to their ability to collect charge and scintillation light. The LAGUNA-LBNO and MODES-SNM projects are two independent projects that focus on using this concept to detect neutral particles of interest. The two projects are consecutively discussed in this thesis. A study on a potential near detector design to be used within the proposed LAGUNA-LBNO experiment is presented. We introduce a novel design for the near detector based on a pressurised gas Argon TPC at 20 bar surrounded by layers of plastic scintillator, encompassed in a pressurised gas chamber. Monte Carlo studies form the basis of the study with focus on detector interaction rates and assessment of the basic detector properties and parameterisation. Based on a 2 × 2 × 2 × m3 TPC we estimate 0.1785 ± 0.0003 (stat) neutrinos p.p.p interactions for a 400 GeV neutrino beam in positive focusing and 0.0628 ± 0.0002 (stat) muon neutrinos p.p.p interactions for energies 0-10 GeV in a 1.8 × 1.8 × 1.8 × m3 fiducial volume. Conversely we can expect high muon backgrounds in the TPC at 44.5 ± 0.5 μ (stat) p.p.p, arising from neutrino interactions with external detector components (non TPC) and surrounding rock interactions. With the inclusion of the muons arising from the beam directly at 70 p.p.p (estimated) we can expect ∼1-2 μ tracks in the TPC / 700 cm2 / spill. Within the MODES-SNM section of the thesis a prototype system is designed, tested and analysed using He4, instead of the commonly favourable He3, for fast neutron detection. A neutron-gamma discrimination analysis is performed based on a pulse shape discrimination technique from the collected scintillation light of PuBe and Co60 sources in laboratory conditions. For high levels of gamma contamination (up to 76%) detection efficiencies exceeding 96% can be achieved with the prototype system while maintaining reasonable false alarm rates (< 1 per hour).
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.706619  DOI: Not available
Keywords: QC Physics
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