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Centrifugal separation and equilibration dynamics in an electron-antiproton plasma

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arxiv 1104.4841 v1 pith:GRXCLGX6 submitted 2011-04-26 physics.plasm-ph hep-exphysics.atom-ph

G.B. Andresen , M.D. Ashkezari , M. Baquero-Ruiz , W. Bertsche , P.D. Bowe , E. Butler , C.L. Cesar , S. Chapman
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M. Charlton A. Deller S. Eriksson J. Fajans T. Friesen M.C. Fujiwara D.R. Gill A. Gutierrez J.S. Hangst W.N. Hardy M.E. Hayden A.J. Humphries R. Hydomako S. Jonsell N. Madsen S. Menary P. Nolan A. Olin A. Povilus P. Pusa F. Robicheaux E. Sarid D.M. Silveira C. So J.W. Storey R.I. Thompson D.P. van der Werf J.S. Wurtele Y. Yamazaki
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classification physics.plasm-phhep-exphysics.atom-ph
keywords electron-antiprotonstatescentrifugally-separateddynamicsequilibrationfirstplasmaplasmas
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Charges in cold, multiple-species, non-neutral plasmas separate radially by mass, forming centrifugally-separated states. Here, we report the first detailed measurements of such states in an electron-antiproton plasma, and the first observations of the separation dynamics in any centrifugally-separated system. While the observed equilibrium states are expected and in agreement with theory, the equilibration time is approximately constant over a wide range of parameters, a surprising and as yet unexplained result. Electron-antiproton plasmas play a crucial role in antihydrogen trapping experiments.

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