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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, Aled Isaac

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

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

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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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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 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.
Keywords: Antimatter, Positrons, Penning traps, rotating wall
College: College of Science
Issue: 7
Start Page: 073028