Antiproton cloud compression in the ALPHA apparatus at CERN

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

doi:10.1007/s10751-015-1202-4

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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

, N. Evetts, J. Fajans, T. Friesen, M. C. Fujiwara, D. R. Gill, J. S. Hangst, W. N. Hardy, M. E. Hayden, Aled Isaac

, S. Jonsell, L. Kurchaninov, A. Little, Niels Madsen

, 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

, J. S. Wurtele, A. I. Zhmoginov

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

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

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DOI (Published version): 10.1007/s10751-015-1202-4

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

first_indexed	2015-10-31T01:56:46Z
last_indexed	2023-01-11T13:55:23Z
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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. 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spelling	2022-11-09T15:46:46.3824848 v2 24055 2015-10-30 Antiproton cloud compression in the ALPHA apparatus at CERN d9099cdd0f182eb9a1c8fc36ed94f53f Michael Charlton Michael Charlton true false 785cbd474febb1bfa9c0e14abaf9c4a8 0000-0002-5390-1879 Stefan Eriksson Stefan Eriksson true false 06d7ed42719ef7bb697cf780c63e26f0 0000-0002-7813-1903 Aled Isaac Aled Isaac true false e348e4d768ee19c1d0c68ce3a66d6303 0000-0002-7372-0784 Niels Madsen Niels Madsen true false 4a4149ebce588e432f310f4ab44dd82a 0000-0001-5436-5214 Dirk van der Werf Dirk van der Werf true false 2015-10-30 BGPS 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. Journal Article Hyperfine Interactions 235 1-3 21 28 Springer Science and Business Media LLC 0304-3843 1572-9540 Antiprotons; Rotating wall; Compression; Electrons; Penning-Malmberg trap; Non-neutral plasma; Antihydrogen 1 11 2015 2015-11-01 10.1007/s10751-015-1202-4 Proceedings of the 6th International Conference on Trapped Charged Particles and Fundamental Physics (TCP 2014), Takamatsu, Japan, 1–5 December 2014 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University 2022-11-09T15:46:46.3824848 2015-10-30T09:35:04.7755484 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics A. Gutierrez 1 M. D. Ashkezari 2 M. Baquero-Ruiz 3 W. Bertsche 4 C. Burrows 5 E. Butler 6 A. Capra 7 C. L. Cesar 8 Michael Charlton 9 R. Dunlop 10 Stefan Eriksson 0000-0002-5390-1879 11 N. Evetts 12 J. Fajans 13 T. Friesen 14 M. C. Fujiwara 15 D. R. Gill 16 J. S. Hangst 17 W. N. Hardy 18 M. E. Hayden 19 Aled Isaac 0000-0002-7813-1903 20 S. Jonsell 21 L. Kurchaninov 22 A. Little 23 Niels Madsen 0000-0002-7372-0784 24 J. T. K. McKenna 25 S. Menary 26 S. C. Napoli 27 P. Nolan 28 K. Olchanski 29 A. Olin 30 P. Pusa 31 C. Ø. Rasmussen 32 F. Robicheaux 33 R. L. Sacramento 34 E. Sarid 35 D. M. Silveira 36 C. So 37 S. Stracka 38 J. Tarlton 39 T. D. Tharp 40 R. I. Thompson 41 P. Tooley 42 M. Turner 43 Dirk van der Werf 0000-0001-5436-5214 44 J. S. Wurtele 45 A. I. Zhmoginov 46
title	Antiproton cloud compression in the ALPHA apparatus at CERN
spellingShingle	Antiproton cloud compression in the ALPHA apparatus at CERN Michael Charlton Stefan Eriksson Aled Isaac Niels Madsen Dirk van der Werf
title_short	Antiproton cloud compression in the ALPHA apparatus at CERN
title_full	Antiproton cloud compression in the ALPHA apparatus at CERN
title_fullStr	Antiproton cloud compression in the ALPHA apparatus at CERN
title_full_unstemmed	Antiproton cloud compression in the ALPHA apparatus at CERN
title_sort	Antiproton cloud compression in the ALPHA apparatus at CERN
author_id_str_mv	d9099cdd0f182eb9a1c8fc36ed94f53f 785cbd474febb1bfa9c0e14abaf9c4a8 06d7ed42719ef7bb697cf780c63e26f0 e348e4d768ee19c1d0c68ce3a66d6303 4a4149ebce588e432f310f4ab44dd82a
author_id_fullname_str_mv	d9099cdd0f182eb9a1c8fc36ed94f53f_*_Michael Charlton 785cbd474febb1bfa9c0e14abaf9c4a8__Stefan Eriksson 06d7ed42719ef7bb697cf780c63e26f0__Aled Isaac e348e4d768ee19c1d0c68ce3a66d6303__Niels Madsen 4a4149ebce588e432f310f4ab44dd82a_**_Dirk van der Werf
author	Michael Charlton Stefan Eriksson Aled Isaac Niels Madsen Dirk van der Werf
author2	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 N. Evetts J. Fajans T. Friesen M. C. Fujiwara D. R. Gill J. S. Hangst W. N. Hardy M. E. Hayden Aled Isaac S. Jonsell L. Kurchaninov A. Little Niels Madsen 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 J. S. Wurtele A. I. Zhmoginov
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description	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.
published_date	2015-11-01T08:00:21Z
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score	11.060726

Antiproton cloud compression in the ALPHA apparatus at CERN

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