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

Journal Article · Thu Oct 15 00:00:00 EDT 2009 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3258840· OSTI ID:21272695

Andresen, G B ^[1]; Bertsche, W; Butler, E; Charlton, M; Humphries, A J; Joergensen, L V; Kerrigan, S J; Madsen, N; Werf, D P. van der ^[2]; Bray, C C; Chapman, S; Fajans, J; Keller, J; Povilus, A; Wurtele, J S ^[3]; Cesar, C L; Lambo, R ^[4]; Fujiwara, M C; Gill, D R; Kurchaninov, L ^[5]

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1. Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark)
2. Department of Physics, Swansea University, Swansea SA2 8PP (United Kingdom)
3. Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300 (United States)
4. Instituto de Fisica, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-972 (Brazil)
5. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3 (Canada)

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 {omega}{sub 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 {omega}{sub r} is close to zero.

• OSTI ID: 21272695
• Journal Information: Physics of Plasmas, Vol. 16, Issue 10; Other Information: DOI: 10.1063/1.3258840; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANTIPROTONS
MULTIPOLES
PENNING EFFECT
ROTATION
TRAPS