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Compression of positron clouds using rotating wall electric fields / Dirk, van der Werf; Aled, Isaac

Hyperfine Interactions, Volume: 212, Issue: 1-3, Pages: 125 - 132

Swansesa University Authors: Dirk, van der Werf, Aled, Isaac

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Abstract

An asymmetric dipolar rotating electric field can be used to compress a trapped cloud of positrons when applied with a frequency close that of their axial bounce, and in the presence of a low pressure molecular gas to provide cooling. Measurements of the compression rate and associated parameters ar...

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Published in: Hyperfine Interactions
ISSN: 0304-3843 1572-9540
Published: 2012
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URI: https://cronfa.swan.ac.uk/Record/cronfa13702
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Abstract: An asymmetric dipolar rotating electric field can be used to compress a trapped cloud of positrons when applied with a frequency close that of their axial bounce, and in the presence of a low pressure molecular gas to provide cooling. Measurements of the compression rate and associated parameters are presented and compared with results of a theory we have developed. The latter treats positron behaviour in a perfect Penning trap potential, in the presence of the rotating field, with the cooling modelled in the Stokes viscous drag approximation. Good agreement between the theory and experiment has been found, which has allowed us to identify the phenomenon as a new form of sideband cooling.
College: College of Science
Issue: 1-3
Start Page: 125
End Page: 132