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Antiproton cloud compression in the ALPHA apparatus at CERN

A. Gutierrez, M. D. Ashkezari, M. Baquero-Ruiz, W. Bertsche, C. Burrows, E. Butler, A. Capra, C. L. Cesar, Michael Charlton, R. Dunlop, Stefan Eriksson Orcid Logo, N. Evetts, J. Fajans, T. Friesen, M. C. Fujiwara, D. R. Gill, J. S. Hangst, W. N. Hardy, M. E. Hayden, Aled Isaac Orcid Logo, S. Jonsell, L. Kurchaninov, A. Little, Niels Madsen Orcid Logo, J. T. K. McKenna, S. Menary, S. C. Napoli, P. Nolan, K. Olchanski, A. Olin, P. Pusa, C. Ø. Rasmussen, F. Robicheaux, R. L. Sacramento, E. Sarid, D. M. Silveira, C. So, S. Stracka, J. Tarlton, T. D. Tharp, R. I. Thompson, P. Tooley, M. Turner, Dirk van der Werf Orcid Logo, J. S. Wurtele, A. I. Zhmoginov

Hyperfine Interactions, Volume: 235, Issue: 1-3, Pages: 21 - 28

Swansea University Authors: Michael Charlton, Stefan Eriksson Orcid Logo, Aled Isaac Orcid Logo, Niels Madsen Orcid Logo, Dirk van der Werf Orcid Logo

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Abstract

We have observed a new mechanism for compression of a non-neutral plasma, where antiprotons embedded in an electron plasma are compressed by a rotating wall drive at a frequency close to the sum of the axial bounce and rotation frequencies. The radius of the antiproton cloud is reduced by up to a fa...

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Published in: Hyperfine Interactions
ISSN: 0304-3843 1572-9540
Published: Springer Science and Business Media LLC 2015
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa24055
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Abstract: We have observed a new mechanism for compression of a non-neutral plasma, where antiprotons embedded in an electron plasma are compressed by a rotating wall drive at a frequency close to the sum of the axial bounce and rotation frequencies. The radius of the antiproton cloud is reduced by up to a factor of 20 and the smallest radius measured is ∼ 0.2 mm. When the rotating wall drive is applied to either a pure electron or pure antipro- ton plasma, no compression is observed in the frequency range of interest. The frequency range over which compression is evident is compared to the sum of the antiproton bounce frequency and the system’s rotation frequency. It is suggested that bounce resonant transport is a likely explanation for the compression of antiproton clouds in this regime.
Item Description: Proceedings of the 6th International Conference on Trapped Charged Particles and Fundamental Physics (TCP 2014), Takamatsu, Japan, 1–5 December 2014
Keywords: Antiprotons; Rotating wall; Compression; Electrons; Penning-Malmberg trap; Non-neutral plasma; Antihydrogen
College: Faculty of Science and Engineering
Issue: 1-3
Start Page: 21
End Page: 28