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Systematic studies of positron accumulation and transfer / GEORGIA BOOTON

Swansea University Author: GEORGIA BOOTON

Abstract

The Swansea positron beam line is a system comprised of a two-pressure-stage nitrogen buffer gas accumulator followed by a third stage trap. This study investigates the ballistic transfer of positrons from the two-stage accumulator to the third stage trap, with the interest to improve the understand...

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Published: Swansea University, Wales, UK 2024
Institution: Swansea University
Degree level: Master of Research
Degree name: MSc by Research
Supervisor: Van der Werf, D., and Madsen, N.
URI: https://cronfa.swan.ac.uk/Record/cronfa66095
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first_indexed 2024-04-19T15:26:35Z
last_indexed 2024-04-19T15:26:35Z
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spelling v2 66095 2024-04-19 Systematic studies of positron accumulation and transfer 8548e044d013056470ff8269dd0e5485 GEORGIA BOOTON GEORGIA BOOTON true false 2024-04-19 The Swansea positron beam line is a system comprised of a two-pressure-stage nitrogen buffer gas accumulator followed by a third stage trap. This study investigates the ballistic transfer of positrons from the two-stage accumulator to the third stage trap, with the interest to improve the understanding and efficiency of so-called “stacking” technique. The re-trapping efficiency for a single transferhas been categorised by systematically investigating parameters describing the ejected cloud, such as its parallel and transverse energy within the re-trapping region, and its subsequent behaviour within the trap, such as expansion rate and lifetime. A greater than ninety percent transfer efficiency is possible for positrons ejected from the accumulator with a 2.7 eV parallel energy spread, and positron lifetimes in the third stage trap are seen to be greater than 43 s with trap aligned on axis injection of particles and decreases with further off axis transfer injections. A variety of particle manipulation techniques (such as the magnetron manipulation) have been used to systematically study the transfer efficiencies of multiple clouds and the dynamics of these stacked clouds within the trap. E-Thesis Swansea University, Wales, UK Physics, positrons, antimatter, Penning trap, trapping charged particles 4 3 2024 2024-03-04 COLLEGE NANME COLLEGE CODE Swansea University Van der Werf, D., and Madsen, N. Master of Research MSc by Research 2024-06-20T16:26:45.1001176 2024-04-19T16:20:18.3326016 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics GEORGIA BOOTON 1 66095__30714__24d8aa690c4849fda87233a719b54b66.pdf 2023_Booton_G.final.66095.pdf 2024-06-20T16:24:33.9083136 Output 6702560 application/pdf E-Thesis – open access true Copyright: The Author, Georgia Booton, 2023 true eng
title Systematic studies of positron accumulation and transfer
spellingShingle Systematic studies of positron accumulation and transfer
GEORGIA BOOTON
title_short Systematic studies of positron accumulation and transfer
title_full Systematic studies of positron accumulation and transfer
title_fullStr Systematic studies of positron accumulation and transfer
title_full_unstemmed Systematic studies of positron accumulation and transfer
title_sort Systematic studies of positron accumulation and transfer
author_id_str_mv 8548e044d013056470ff8269dd0e5485
author_id_fullname_str_mv 8548e044d013056470ff8269dd0e5485_***_GEORGIA BOOTON
author GEORGIA BOOTON
author2 GEORGIA BOOTON
format E-Thesis
publishDate 2024
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 The Swansea positron beam line is a system comprised of a two-pressure-stage nitrogen buffer gas accumulator followed by a third stage trap. This study investigates the ballistic transfer of positrons from the two-stage accumulator to the third stage trap, with the interest to improve the understanding and efficiency of so-called “stacking” technique. The re-trapping efficiency for a single transferhas been categorised by systematically investigating parameters describing the ejected cloud, such as its parallel and transverse energy within the re-trapping region, and its subsequent behaviour within the trap, such as expansion rate and lifetime. A greater than ninety percent transfer efficiency is possible for positrons ejected from the accumulator with a 2.7 eV parallel energy spread, and positron lifetimes in the third stage trap are seen to be greater than 43 s with trap aligned on axis injection of particles and decreases with further off axis transfer injections. A variety of particle manipulation techniques (such as the magnetron manipulation) have been used to systematically study the transfer efficiencies of multiple clouds and the dynamics of these stacked clouds within the trap.
published_date 2024-03-04T16:26:44Z
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score 11.028842

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