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Beam studies in muon and neutrino physics
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Lord, T. (2021) Beam studies in muon and neutrino physics. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3912341~S15
Abstract
The Muon Ionization Cooling Experiment (MICE) was designed to provide the first demonstration of muon ionization cooling by measuring the reduction in phase-space volume induced in a muon beam passed through a low-Z absorber material within the MICE cooling channel. This technique has been validated by the MICE collaboration using a cooling channel in ‘flip’ mode, where the on-axis magnetic field reverses direction across the absorber. In this thesis, an analysis of the cooling effect in ‘solenoid’ mode, where the on-axis magnetic field points in the same direction throughout the channel, has been implemented, with the change in phase-space volume characterised by calculation of single-particle amplitudes. The ratio of amplitudes of muons before and after traversing the absorber material show a pronounced cooling effect for beams which observe a filled liquid hydrogen absorber or lithium hydride disk, with no equivalent cooling seen by beams traversing an empty vacuum or unfilled hydrogen vessel. The Deep Underground Neutrino Experiment (DUNE) is a future long baseline neutrino oscillation experiment, with a planned near detector site at Fermilab, Il., USA, and a far detector site under construction in South Dakota, USA. The DUNE-PRISM program aims to reduce sensitivity of the extracted oscillation parameters to interaction model uncertainties and detector effects by replicating the oscillated far detector neutrino energy spectrum using linear combinations of near detector measurements, utilising a series of near detector measurements at increasing angles off of the neutrino beam’s axis. To advance this technique, an analysis examining to what degree additional flux contributions obtained from varying the magnetic focusing horn currents can improve the agreement between linear combinations of near detector measurements and the far detector spectra has been conducted. Immediate improvement is obtained at energies above 3.5 GeV with the addition of a single additional flux contribution. Reductions in the maximum allowed off-axis distance can be compensated for with the addition of a small number of flux contributions.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QC Physics | ||||
Library of Congress Subject Headings (LCSH): | Muons, Neutrinos, Particle beams, Particle accelerators | ||||
Official Date: | December 2021 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Physics | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Boyd, Steve B. | ||||
Format of File: | |||||
Extent: | xxvi, 224 pages : illustrations (some colour) | ||||
Language: | eng |
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