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Antihydrogen trapping assisted by sympathetically cooled positrons

N Madsen, F Robicheaux, S Jonsell, Niels Madsen Orcid Logo

New Journal of Physics, Volume: 16, Issue: 6, Start page: 063046

Swansea University Author: Niels Madsen Orcid Logo

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DOI (Published version): 10.1088/1367-2630/16/6/063046

Abstract

Antihydrogen, the bound state of an antiproton and a positron, is of interest for use in precision tests of nature's fundamental symmetries. Antihydrogen formed by carefully merging cold plasmas of positrons and antiprotons has recently been trapped in magnetic traps. The efficiency of trapping...

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Published in: New Journal of Physics
Published: 2014
Online Access: http://iopscience.iop.org/1367-2630/16/6/063046/
URI: https://cronfa.swan.ac.uk/Record/cronfa18049
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spelling 2019-08-08T10:38:53.0100229 v2 18049 2014-06-20 Antihydrogen trapping assisted by sympathetically cooled positrons e348e4d768ee19c1d0c68ce3a66d6303 0000-0002-7372-0784 Niels Madsen Niels Madsen true false 2014-06-20 SPH Antihydrogen, the bound state of an antiproton and a positron, is of interest for use in precision tests of nature's fundamental symmetries. Antihydrogen formed by carefully merging cold plasmas of positrons and antiprotons has recently been trapped in magnetic traps. The efficiency of trapping is strongly dependent on the temperature of the nascent antihydrogen, which, to be trapped, must have a kinetic energy less than the trap depth of $\sim 0.5\;{\mbox{K}}\;{{k}_{B}}$. In the conditions in the ALPHA experiment, the antihydrogen temperature seems dominated by the temperature of the positron plasma used for the synthesis. Cold positrons are therefore of paramount interest in that experiment. In this paper, we propose an alternative route to make ultra-cold positrons for enhanced antihydrogen trapping. We investigate theoretically how to extend previously successful sympathetic cooling of positrons by laser-cooled positive ions to be used for antihydrogen trapping. Using simulations, we investigate the effectiveness of such cooling in conditions similar to those in ALPHA, and discuss how the formation process and the nascent antihydrogen may be influenced by the presence of positive ions. We argue that this technique is a viable alternative to methods such as evaporative and adiabatic cooling, and may overcome limitations faced by these. Ultra-cold positrons, once available, may also be of interest for a range of other applications. Journal Article New Journal of Physics 16 6 063046 Antihydrogen, Laser cooling, Non-neutral plasma 19 6 2014 2014-06-19 10.1088/1367-2630/16/6/063046 http://iopscience.iop.org/1367-2630/16/6/063046/ COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2019-08-08T10:38:53.0100229 2014-06-20T09:20:27.4186414 College of Science Physics N Madsen 1 F Robicheaux 2 S Jonsell 3 Niels Madsen 0000-0002-7372-0784 4 0017396-22062016140929.pdf 2014a.pdf 2014-06-20T09:26:05.0630000 Output 704486 application/pdf Version of Record true 2014-06-20T00:00:00.0000000 Distributed under the terms of a Creative Commons Attribution Non-Commercial (CC-BY-3.0) true
title Antihydrogen trapping assisted by sympathetically cooled positrons
spellingShingle Antihydrogen trapping assisted by sympathetically cooled positrons
Niels Madsen
title_short Antihydrogen trapping assisted by sympathetically cooled positrons
title_full Antihydrogen trapping assisted by sympathetically cooled positrons
title_fullStr Antihydrogen trapping assisted by sympathetically cooled positrons
title_full_unstemmed Antihydrogen trapping assisted by sympathetically cooled positrons
title_sort Antihydrogen trapping assisted by sympathetically cooled positrons
author_id_str_mv e348e4d768ee19c1d0c68ce3a66d6303
author_id_fullname_str_mv e348e4d768ee19c1d0c68ce3a66d6303_***_Niels Madsen
author Niels Madsen
author2 N Madsen
F Robicheaux
S Jonsell
Niels Madsen
format Journal article
container_title New Journal of Physics
container_volume 16
container_issue 6
container_start_page 063046
publishDate 2014
institution Swansea University
doi_str_mv 10.1088/1367-2630/16/6/063046
college_str College of Science
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hierarchy_top_title College of Science
hierarchy_parent_id collegeofscience
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url http://iopscience.iop.org/1367-2630/16/6/063046/
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description Antihydrogen, the bound state of an antiproton and a positron, is of interest for use in precision tests of nature's fundamental symmetries. Antihydrogen formed by carefully merging cold plasmas of positrons and antiprotons has recently been trapped in magnetic traps. The efficiency of trapping is strongly dependent on the temperature of the nascent antihydrogen, which, to be trapped, must have a kinetic energy less than the trap depth of $\sim 0.5\;{\mbox{K}}\;{{k}_{B}}$. In the conditions in the ALPHA experiment, the antihydrogen temperature seems dominated by the temperature of the positron plasma used for the synthesis. Cold positrons are therefore of paramount interest in that experiment. In this paper, we propose an alternative route to make ultra-cold positrons for enhanced antihydrogen trapping. We investigate theoretically how to extend previously successful sympathetic cooling of positrons by laser-cooled positive ions to be used for antihydrogen trapping. Using simulations, we investigate the effectiveness of such cooling in conditions similar to those in ALPHA, and discuss how the formation process and the nascent antihydrogen may be influenced by the presence of positive ions. We argue that this technique is a viable alternative to methods such as evaporative and adiabatic cooling, and may overcome limitations faced by these. Ultra-cold positrons, once available, may also be of interest for a range of other applications.
published_date 2014-06-19T03:35:27Z
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