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A Preliminary Study of the Effect of the Chirped Rotating Wall on a Positron Cloud / PHILLIP JOHN

Swansea University Author: PHILLIP JOHN

DOI (Published version): 10.23889/SUthesis.63766

Abstract

The density of the positron cloud is a crucial parameter in many applications ofaccumulated positrons. Previous work has shown that adjusting the frequency ofthe rotating wall potential following positron accumulation can be used to controlthe density of positron clouds. In this work, positron cloud...

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Published: Swansea, Wales, UK 2023
Institution: Swansea University
Degree level: Master of Philosophy
Degree name: M.Phil
Supervisor: Eriksson, Stefan J.
URI: https://cronfa.swan.ac.uk/Record/cronfa63766
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first_indexed 2023-07-03T13:55:55Z
last_indexed 2023-07-03T13:55:55Z
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spelling v2 63766 2023-07-03 A Preliminary Study of the Effect of the Chirped Rotating Wall on a Positron Cloud 3eb24b47c3f6c5606bdc0a936ecccedf PHILLIP JOHN PHILLIP JOHN true false 2023-07-03 The density of the positron cloud is a crucial parameter in many applications ofaccumulated positrons. Previous work has shown that adjusting the frequency ofthe rotating wall potential following positron accumulation can be used to controlthe density of positron clouds. In this work, positron clouds were studied afterbeing compressed using a linear rotating wall frequency sweep under a selection ofrotating wall drive amplitudes and cooling gas pressures following an initial staticfrequency compression. This was performed for SF6, CF4, and briefly for CO. Theeffect of changing the cooling gas appears congruent to that shown by the staticfrequency case. The results are in qualitative agreement with previous work byDeller et al., and compare briefly but favourably to a simplistic numerical model. E-Thesis Swansea, Wales, UK Positrons, rotating wall, frequency sweep 11 6 2023 2023-06-11 10.23889/SUthesis.63766 COLLEGE NANME COLLEGE CODE Swansea University Eriksson, Stefan J. Master of Philosophy M.Phil EPSRC 2023-10-05T14:51:57.1647161 2023-07-03T14:49:58.3759106 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics PHILLIP JOHN 1 63766__28025__04d1cfe4303d4918a508749e580e78f7.pdf 2023_John_P.final.63766.pdf 2023-07-03T14:57:10.5886319 Output 17624069 application/pdf E-Thesis – open access true Copyright: The Author, Phillip John, 2023. true eng
title A Preliminary Study of the Effect of the Chirped Rotating Wall on a Positron Cloud
spellingShingle A Preliminary Study of the Effect of the Chirped Rotating Wall on a Positron Cloud
PHILLIP JOHN
title_short A Preliminary Study of the Effect of the Chirped Rotating Wall on a Positron Cloud
title_full A Preliminary Study of the Effect of the Chirped Rotating Wall on a Positron Cloud
title_fullStr A Preliminary Study of the Effect of the Chirped Rotating Wall on a Positron Cloud
title_full_unstemmed A Preliminary Study of the Effect of the Chirped Rotating Wall on a Positron Cloud
title_sort A Preliminary Study of the Effect of the Chirped Rotating Wall on a Positron Cloud
author_id_str_mv 3eb24b47c3f6c5606bdc0a936ecccedf
author_id_fullname_str_mv 3eb24b47c3f6c5606bdc0a936ecccedf_***_PHILLIP JOHN
author PHILLIP JOHN
author2 PHILLIP JOHN
format E-Thesis
publishDate 2023
institution Swansea University
doi_str_mv 10.23889/SUthesis.63766
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 density of the positron cloud is a crucial parameter in many applications ofaccumulated positrons. Previous work has shown that adjusting the frequency ofthe rotating wall potential following positron accumulation can be used to controlthe density of positron clouds. In this work, positron clouds were studied afterbeing compressed using a linear rotating wall frequency sweep under a selection ofrotating wall drive amplitudes and cooling gas pressures following an initial staticfrequency compression. This was performed for SF6, CF4, and briefly for CO. Theeffect of changing the cooling gas appears congruent to that shown by the staticfrequency case. The results are in qualitative agreement with previous work byDeller et al., and compare briefly but favourably to a simplistic numerical model.
published_date 2023-06-11T14:51:58Z
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score 11.016235

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