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Magnetic multipole induced zero-rotation frequency bounce-resonant loss in a Penning–Malmberg trap used for antihydrogen trapping

Phys. Plasmas 16, 100702 (2009); doi:10.1063/1.3258840

Published 30 October 2009

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G. B. Andresen,1 W. Bertsche,2 C. C. Bray,3 E. Butler,2 C. L. Cesar,4 S. Chapman,3 M. Charlton,2 J. Fajans,3 M. C. Fujiwara,5 D. R. Gill,5 W. N. Hardy,6 R. S. Hayano,7 M. E. Hayden,8 A. J. Humphries,2 R. Hydomako,9 L. V. Jørgensen,2 S. J. Kerrigan,2 J. Keller,3 L. Kurchaninov,5 R. Lambo,4 N. Madsen,2 P. Nolan,10 K. Olchanski,5 A. Olin,5 A. Povilus,3 P. Pusa,10 F. Robicheaux,11 E. Sarid,12 S. Seif El Nasr,6 D. M. Silveira,7,13 J. W. Storey,5 R. I. Thompson,9 D. P. van der Werf,2 J. S. Wurtele,3 and Y. Yamazaki13
1Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
2Department of Physics, Swansea University, Swansea SA2 8PP, United Kingdom
3Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300, USA
4Instituto de Física, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-972, Brazil
5TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
6Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
7Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
8Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
9Department of Physics and Astronomy, University of Calgary, Calgary, Alberta T2N 1N4, Canada
10Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
11Department of Physics, Auburn University, Auburn, Alabama 36849-5311, USA
12Department of Physics, NRCN-Nuclear Research Center Negev, Beer Sheva IL-84190, Israel
13Atomic Physics Laboratory, RIKEN, Saitama 351-0198, Japan
(ALPHA Collaboration)
In many antihydrogen trapping schemes, antiprotons held in a short-well Penning–Malmberg trap are released into a longer well. This process necessarily causes the bounce-averaged rotation frequency [overline Omega ]r of the antiprotons around the trap axis to pass through zero. In the presence of a transverse magnetic multipole, experiments and simulations show that many antiprotons (over 30% in some cases) can be lost to a hitherto unidentified bounce-resonant process when [overline Omega ]r is close to zero. ©2009 American Institute of Physics
History: Received 21 May 2009; accepted 15 October 2009; published 30 October 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/100702/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.55.Lf
    Field-reversed configurations, rotamaks, Astrons, ion rings, magnetized target fusion, and cusps
  • YEAR: 2009

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ISSN:
1070-664X (print)   1089-7674 (online)
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REFERENCES (15)
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