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

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 Ω ¯ r of the antiprotons around the trap axis to pass through zero. In the presence of a transverse ma...

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Bibliographic Details
Published in:Physics of plasmas 2009-10, Vol.16 (10), p.100702-100702-4
Main Authors: Andresen, G. B., Bertsche, W., Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Gill, D. R., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jørgensen, L. V., Kerrigan, S. J., Keller, J., Kurchaninov, L., Lambo, R., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., El Nasr, S. Seif, Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., Yamazaki, Y.
Format: Article
Language:English
Subjects:
ANTIPROTONS
ATOMIC AND MOLECULAR PHYSICS
MULTIPOLES
PENNING EFFECT
ROTATION
TRAPS
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Summary: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 Ω ¯ 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 Ω ¯ r is close to zero.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.3258840