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Radially selective inward transport of positrons in a Penning–Malmberg trap

A Deller, T Mortensen, C A Isaac, D P van der Werf, M Charlton, Michael Charlton, Dirk van der Werf Orcid Logo, Aled Isaac Orcid Logo

New Journal of Physics, Volume: 16, Issue: 7, Start page: 073028

Swansea University Authors: Michael Charlton, Dirk van der Werf Orcid Logo, Aled Isaac Orcid Logo

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DOI (Published version): 10.1088/1367-2630/16/7/073028

Abstract

The anharmonic component of the electric field of a Penning–Malmberg trap is exploited to manipulate a subset of the radial (r) distribution of trapped posi- trons, using a dipole field made to rotate about the long-axis (z) of the trap. This ‘rotating wall’ technique (RW) induces inward transport a...

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Published in: New Journal of Physics
Published: 2014
URI: https://cronfa.swan.ac.uk/Record/cronfa19832
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spelling 2019-08-08T11:07:46.4063362 v2 19832 2015-01-02 Radially selective inward transport of positrons in a Penning–Malmberg trap d9099cdd0f182eb9a1c8fc36ed94f53f Michael Charlton Michael Charlton true false 4a4149ebce588e432f310f4ab44dd82a 0000-0001-5436-5214 Dirk van der Werf Dirk van der Werf true false 06d7ed42719ef7bb697cf780c63e26f0 0000-0002-7813-1903 Aled Isaac Aled Isaac true false 2015-01-02 FGSEN The anharmonic component of the electric field of a Penning–Malmberg trap is exploited to manipulate a subset of the radial (r) distribution of trapped posi- trons, using a dipole field made to rotate about the long-axis (z) of the trap. This ‘rotating wall’ technique (RW) induces inward transport at frequencies asso- ciated with the motion of trapped particles, although similarly it causes heating. The motional frequencies vary spatially within a non-ideal trap, thus resonant interaction with the rotating field may be restricted to a region selected to lie away from the trap centre, thereby forming a pseudo-potential barrier and reducing losses due to both heating and expansion. We demonstrate this effect for improved accumulation of positrons and further outline a technique to achieve strong compression with low RW amplitudes by chirping the drive frequency. Journal Article New Journal of Physics 16 7 073028 Antimatter, Positrons, Penning traps, rotating wall 31 12 2014 2014-12-31 10.1088/1367-2630/16/7/073028 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2019-08-08T11:07:46.4063362 2015-01-02T20:36:53.7758594 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics A Deller 1 T Mortensen 2 C A Isaac 3 D P van der Werf 4 M Charlton 5 Michael Charlton 6 Dirk van der Werf 0000-0001-5436-5214 7 Aled Isaac 0000-0002-7813-1903 8
title Radially selective inward transport of positrons in a Penning–Malmberg trap
spellingShingle Radially selective inward transport of positrons in a Penning–Malmberg trap
Michael Charlton
Dirk van der Werf
Aled Isaac
title_short Radially selective inward transport of positrons in a Penning–Malmberg trap
title_full Radially selective inward transport of positrons in a Penning–Malmberg trap
title_fullStr Radially selective inward transport of positrons in a Penning–Malmberg trap
title_full_unstemmed Radially selective inward transport of positrons in a Penning–Malmberg trap
title_sort Radially selective inward transport of positrons in a Penning–Malmberg trap
author_id_str_mv d9099cdd0f182eb9a1c8fc36ed94f53f
4a4149ebce588e432f310f4ab44dd82a
06d7ed42719ef7bb697cf780c63e26f0
author_id_fullname_str_mv d9099cdd0f182eb9a1c8fc36ed94f53f_***_Michael Charlton
4a4149ebce588e432f310f4ab44dd82a_***_Dirk van der Werf
06d7ed42719ef7bb697cf780c63e26f0_***_Aled Isaac
author Michael Charlton
Dirk van der Werf
Aled Isaac
author2 A Deller
T Mortensen
C A Isaac
D P van der Werf
M Charlton
Michael Charlton
Dirk van der Werf
Aled Isaac
format Journal article
container_title New Journal of Physics
container_volume 16
container_issue 7
container_start_page 073028
publishDate 2014
institution Swansea University
doi_str_mv 10.1088/1367-2630/16/7/073028
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 0
active_str 0
description The anharmonic component of the electric field of a Penning–Malmberg trap is exploited to manipulate a subset of the radial (r) distribution of trapped posi- trons, using a dipole field made to rotate about the long-axis (z) of the trap. This ‘rotating wall’ technique (RW) induces inward transport at frequencies asso- ciated with the motion of trapped particles, although similarly it causes heating. The motional frequencies vary spatially within a non-ideal trap, thus resonant interaction with the rotating field may be restricted to a region selected to lie away from the trap centre, thereby forming a pseudo-potential barrier and reducing losses due to both heating and expansion. We demonstrate this effect for improved accumulation of positrons and further outline a technique to achieve strong compression with low RW amplitudes by chirping the drive frequency.
published_date 2014-12-31T03:23:22Z
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score 11.036706

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