Modeling He-II cryostat performance and characterization of spin manipulation components for a neutron electric dipole moment experiment at TRIUMF

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dc.contributor.authorHansen-Romu, Sean
dc.contributor.examiningcommitteeSharma, Kumar (Physics and Astronomy)en_US
dc.contributor.examiningcommitteeMartin, Jeff (Physics and Astronomy)en_US
dc.contributor.examiningcommitteeGrinyer, Gwen (University of Regina)en_US
dc.contributor.supervisorJamieson, Blair
dc.date.accessioned2023-03-09T15:59:57Z
dc.date.available2023-03-09T15:59:57Z
dc.date.copyright2023-02-17
dc.date.issued2023-02-17
dc.date.submitted2023-02-17T21:30:17Zen_US
dc.degree.disciplinePhysics and Astronomyen_US
dc.degree.levelDoctor of Philosophy (Ph.D.)en_US
dc.description.abstractThis thesis chronicles measurements of ultracold neutrons (UCN) performed at TRIUMF in fall 2018 and fall 2019. Heat response data of the UCN source bottle was taken by measuring its temperature using the vapour pressure of the 4He. The time-dependence of the He-II bottle temperature is well-described by a model where heat transport is limited by quantum turbulence in the He-II. In addition, measurements of UCN spin manipulation components showed that the adiabatic fast-passage device had a spin flipping efficiency of 0.977 ± 0.008 and 1.007 ± 0.008, and the spin analyzers had a measured polarizing power of 0.650 ± 0.003 and 0.630 ± 0.003. Simulations show that the low spin analyzer efficiency is most likely due to a lower than expected magnetization in the foils, and additional sources of depolarization around the spin-analyzers. The simulations of the analyzer show that the single pass polarizing power of the foil is 0.78 ± 0.08. Under the assumption of no transmission of the wrong spin state through the superconducting magnet, the polarizing power was measured as 0.57 ± 0.05. Simulations reveal that the bore was responsible for some reduction in polarizing power, however better magnetic field gradient control for the spin flipper gradient is required to rule out the possibility of inefficient spin flippers as the cause of the depolarization.en_US
dc.description.noteMay 2023en_US
dc.description.sponsorshipCanada Foundation for Innovation.en_US
dc.identifier.urihttp://hdl.handle.net/1993/37196
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectultracold neutronsen_US
dc.subjectsuperfluid heliumen_US
dc.subjectsubatomic physicsen_US
dc.subjectnEDMen_US
dc.subjectUCNen_US
dc.subjectneutron polarizeren_US
dc.titleModeling He-II cryostat performance and characterization of spin manipulation components for a neutron electric dipole moment experiment at TRIUMFen_US
dc.typedoctoral thesisen_US
local.subject.manitobanoen_US
oaire.awardNumberSAPPJ-2019-00031en_US
oaire.awardTitleUltracold Neutron Electric Dipole Miment Exoerimenten_US
oaire.awardURIhttps://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=739432en_US
project.funder.identifierhttps://doi.org/10.13039/501100000038en_US
project.funder.nameNatural Sciences and Engineering Research Council of Canadaen_US
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