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Double Rotating Wall Compression of Positron Clouds and Towards Resistive Cooling / Hywel Turner Evans

Swansea University Author: Hywel Turner Evans

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DOI (Published version): 10.23889/SUthesis.60070

Abstract

Low energy positron clouds from a buer gas trap have been characterised and compressed by a novel double rotating wall (RW) electric field. A theoretical and experimental study comparing compression due to dipolar single and double RW electric fields is presented, with details of a custom-built func...

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Published: Swansea 2022
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Isaac, Aled ; Charlton, Michael
URI: https://cronfa.swan.ac.uk/Record/cronfa60070
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first_indexed 2022-05-24T10:21:18Z
last_indexed 2022-05-25T03:36:50Z
id cronfa60070
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spelling 2022-05-24T16:25:18.7920567 v2 60070 2022-05-24 Double Rotating Wall Compression of Positron Clouds and Towards Resistive Cooling 73cc98a5b8e4122fdfcee5d88208b0b7 0000-0001-6745-4187 Hywel Turner Evans Hywel Turner Evans true false 2022-05-24 HDAT Low energy positron clouds from a buer gas trap have been characterised and compressed by a novel double rotating wall (RW) electric field. A theoretical and experimental study comparing compression due to dipolar single and double RW electric fields is presented, with details of a custom-built function generator capable of operating on two sets of four, six, and eight-segment electrodes. The installation of a cylindrical Penning trap with two sets of six-segment RW elec-trodes has allowed the implementation of a double RW, which provides a better approximation to the electric potential in the model for independent charged par-ticle compression. A reduction in particle heating has been observed with the double RW, whilst obtaining at least equivalent compression as the single RW, which may in future allow a reduction in the minimum attainable cloud width.Without the use of RW electric fields, optimisations to positron ejection and recapture techniques led to positron clouds being held in a deep, harmonic poten-tial well for over 100 s, enabling time to study RW electric fields and to perform resistive cooling experiments. E-Thesis Swansea Positron, physics, antimatter, Penning trap, rotating wall, trapped charged particle 18 5 2022 2022-05-18 10.23889/SUthesis.60070 ORCiD identifier: https://orcid.org/0000-0001-6745-4187 COLLEGE NANME Health Data Science COLLEGE CODE HDAT Swansea University Isaac, Aled ; Charlton, Michael Doctoral Ph.D Coleg Cymraeg Cenedlaethol; College of Science Swansea University (50/50 match funded); Grant number: YSG17/04 (Coleg Cymraeg Cenedlaethol), none for College of Science 2022-05-24T16:25:18.7920567 2022-05-24T11:15:54.9973677 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Hywel Turner Evans 0000-0001-6745-4187 1 60070__24161__f9aa6495d69341ffa13544bdfe6ab55d.pdf Evans_Hywel_PhD_Thesis_Final_Redacted_Signature.pdf 2022-05-24T11:42:17.1620599 Output 11112776 application/pdf E-Thesis – open access true Copyright: The author, Hywel T. Evans, 2022. true eng
title Double Rotating Wall Compression of Positron Clouds and Towards Resistive Cooling
spellingShingle Double Rotating Wall Compression of Positron Clouds and Towards Resistive Cooling
Hywel Turner Evans
title_short Double Rotating Wall Compression of Positron Clouds and Towards Resistive Cooling
title_full Double Rotating Wall Compression of Positron Clouds and Towards Resistive Cooling
title_fullStr Double Rotating Wall Compression of Positron Clouds and Towards Resistive Cooling
title_full_unstemmed Double Rotating Wall Compression of Positron Clouds and Towards Resistive Cooling
title_sort Double Rotating Wall Compression of Positron Clouds and Towards Resistive Cooling
author_id_str_mv 73cc98a5b8e4122fdfcee5d88208b0b7
author_id_fullname_str_mv 73cc98a5b8e4122fdfcee5d88208b0b7_***_Hywel Turner Evans
author Hywel Turner Evans
author2 Hywel Turner Evans
format E-Thesis
publishDate 2022
institution Swansea University
doi_str_mv 10.23889/SUthesis.60070
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 Low energy positron clouds from a buer gas trap have been characterised and compressed by a novel double rotating wall (RW) electric field. A theoretical and experimental study comparing compression due to dipolar single and double RW electric fields is presented, with details of a custom-built function generator capable of operating on two sets of four, six, and eight-segment electrodes. The installation of a cylindrical Penning trap with two sets of six-segment RW elec-trodes has allowed the implementation of a double RW, which provides a better approximation to the electric potential in the model for independent charged par-ticle compression. A reduction in particle heating has been observed with the double RW, whilst obtaining at least equivalent compression as the single RW, which may in future allow a reduction in the minimum attainable cloud width.Without the use of RW electric fields, optimisations to positron ejection and recapture techniques led to positron clouds being held in a deep, harmonic poten-tial well for over 100 s, enabling time to study RW electric fields and to perform resistive cooling experiments.
published_date 2022-05-18T04:17:52Z
_version_ 1763754190961639424
score 11.016235

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