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Antihydrogen formation, dynamics and trapping. / Eoin Butler

Abstract

Antihydrogen, the simplest pure-antimatter atomic system, holds the promise of direct tests of matter-antimatter equivalence and CPT invariance, two of the outstanding unanswered questions in modern physics. Antihydrogen is now routinely produced in charged-particle traps through the combination of...

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Published: Swansea University 2011
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Niels Madsen, Michael Charlton.
URI: https://cronfa.swan.ac.uk/Record/cronfa57126
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last_indexed 2021-06-16T03:22:21Z
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recordtype RisThesis
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spelling 2021-06-15T15:53:46.5957609 v2 57126 2021-06-15 Antihydrogen formation, dynamics and trapping. 2021-06-15 Antihydrogen, the simplest pure-antimatter atomic system, holds the promise of direct tests of matter-antimatter equivalence and CPT invariance, two of the outstanding unanswered questions in modern physics. Antihydrogen is now routinely produced in charged-particle traps through the combination of plasmas of antiprotons and positrons, but the atoms escape and are destroyed in a minuscule fraction of a second. The focus of this work is the production of a sample of cold antihydrogen atoms in a magnetic atom trap. This poses an extreme challenge, because the state-of-the-art atom traps are only approximately 0.5 K deep for ground-state antihydrogen atoms, much shallower than the energies of particles stored in the plasmas. This thesis will outline the main parts of the ALPHA experiment, with an overview of the important physical processes at work. Antihydrogen production techniques will be described, and an analysis of the spatial annihilation distribution to give indications of the temperature and binding energy distribution of the atoms will be presented. Finally, we describe the techniques needed to demonstrate confinement of antihydrogen atoms, apply them to a data taking run and present the results, making a definitive identification of trapped antihydrogen atoms. E-Thesis Swansea University Physics, Antihydrogen 31 12 2011 2011-12-31 COLLEGE NANME COLLEGE CODE Swansea University Niels Madsen, Michael Charlton. Doctoral Ph.D Not Required 2021-06-15T15:53:46.5957609 2021-06-15T15:44:33.1957210 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Eoin Butler 1 57126__20164__aa7f15c9daa64b96968bcb0faa8414c4.pdf Butler, Eoin.2011.pdf 2021-06-15T15:51:35.8835588 Output 6955731 application/pdf Version of Record true true eng
title Antihydrogen formation, dynamics and trapping.
spellingShingle Antihydrogen formation, dynamics and trapping.
,
title_short Antihydrogen formation, dynamics and trapping.
title_full Antihydrogen formation, dynamics and trapping.
title_fullStr Antihydrogen formation, dynamics and trapping.
title_full_unstemmed Antihydrogen formation, dynamics and trapping.
title_sort Antihydrogen formation, dynamics and trapping.
author ,
author2 Eoin Butler
format E-Thesis
publishDate 2011
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
active_str 0
description Antihydrogen, the simplest pure-antimatter atomic system, holds the promise of direct tests of matter-antimatter equivalence and CPT invariance, two of the outstanding unanswered questions in modern physics. Antihydrogen is now routinely produced in charged-particle traps through the combination of plasmas of antiprotons and positrons, but the atoms escape and are destroyed in a minuscule fraction of a second. The focus of this work is the production of a sample of cold antihydrogen atoms in a magnetic atom trap. This poses an extreme challenge, because the state-of-the-art atom traps are only approximately 0.5 K deep for ground-state antihydrogen atoms, much shallower than the energies of particles stored in the plasmas. This thesis will outline the main parts of the ALPHA experiment, with an overview of the important physical processes at work. Antihydrogen production techniques will be described, and an analysis of the spatial annihilation distribution to give indications of the temperature and binding energy distribution of the atoms will be presented. Finally, we describe the techniques needed to demonstrate confinement of antihydrogen atoms, apply them to a data taking run and present the results, making a definitive identification of trapped antihydrogen atoms.
published_date 2011-12-31T07:46:18Z
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score 11.0552

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