Journal article 1516 views
Radially selective inward transport of positrons in a Penning–Malmberg trap
,
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...
| Published in: | New Journal of Physics |
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| Published: |
2014
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| 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. |
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| Keywords: |
Antimatter, Positrons, Penning traps, rotating wall |
| College: |
Faculty of Science and Engineering |
| Issue: |
7 |
| Start Page: |
073028 |