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The generation and manipulation of low energy positron beams. / Jonathan Clarke

Swansea University Author: Jonathan Clarke

Abstract

A laboratory based low energy positron beamline has been constructed and tested. The techniques underlying this device are described, as are modifications and improvements which were made to the conventional operation of such apparatus. The use of this beamline in conjunction with a novel positron a...

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Published: 2005
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42279
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first_indexed 2018-08-02T18:54:19Z
last_indexed 2019-10-21T16:47:32Z
id cronfa42279
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spelling 2018-08-14T12:31:35.5019289 v2 42279 2018-08-02 The generation and manipulation of low energy positron beams. 5884711ed922dca3e1e01e77c2f70da6 NULL Jonathan Clarke Jonathan Clarke true true 2018-08-02 A laboratory based low energy positron beamline has been constructed and tested. The techniques underlying this device are described, as are modifications and improvements which were made to the conventional operation of such apparatus. The use of this beamline in conjunction with a novel positron accumulator using a two-stage buffer gas cooling method is discussed. Its ability to operate in the 1-10 Hz range, providing bursts of ~ 105 positrons with a time width of ~ 20 ns is described. The deviation from the expected ideal behaviour of this accumulator is recorded, and the efficacy of this departure in detecting performance problems presented. A number of applications of the positron apparatus are described. A series of simulations on a positron time-bunching apparatus are expounded. Agreement with the observed timing resolution was found only when non-ideal processes occurring within the device were considered. Suggestions towards possible optimization of these non-ideal processes to further improve the timing resolution of such an apparatus are put forward. E-Thesis Applied physics.;Nuclear physics and radiation. 31 12 2005 2005-12-31 COLLEGE NANME Physics COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-14T12:31:35.5019289 2018-08-02T16:24:28.6669869 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Jonathan Clarke NULL 1 0042279-02082018162441.pdf 10797987.pdf 2018-08-02T16:24:41.9430000 Output 12477624 application/pdf E-Thesis true 2018-08-02T16:24:41.9430000 false
title The generation and manipulation of low energy positron beams.
spellingShingle The generation and manipulation of low energy positron beams.
Jonathan Clarke
title_short The generation and manipulation of low energy positron beams.
title_full The generation and manipulation of low energy positron beams.
title_fullStr The generation and manipulation of low energy positron beams.
title_full_unstemmed The generation and manipulation of low energy positron beams.
title_sort The generation and manipulation of low energy positron beams.
author_id_str_mv 5884711ed922dca3e1e01e77c2f70da6
author_id_fullname_str_mv 5884711ed922dca3e1e01e77c2f70da6_***_Jonathan Clarke
author Jonathan Clarke
author2 Jonathan Clarke
format E-Thesis
publishDate 2005
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 A laboratory based low energy positron beamline has been constructed and tested. The techniques underlying this device are described, as are modifications and improvements which were made to the conventional operation of such apparatus. The use of this beamline in conjunction with a novel positron accumulator using a two-stage buffer gas cooling method is discussed. Its ability to operate in the 1-10 Hz range, providing bursts of ~ 105 positrons with a time width of ~ 20 ns is described. The deviation from the expected ideal behaviour of this accumulator is recorded, and the efficacy of this departure in detecting performance problems presented. A number of applications of the positron apparatus are described. A series of simulations on a positron time-bunching apparatus are expounded. Agreement with the observed timing resolution was found only when non-ideal processes occurring within the device were considered. Suggestions towards possible optimization of these non-ideal processes to further improve the timing resolution of such an apparatus are put forward.
published_date 2005-12-31T03:50:39Z
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score 10.927107