Phys. Rev. Lett.
105,
013003
(2010)
[5 pages]
Evaporative Cooling of Antiprotons to Cryogenic Temperatures
G. B. Andresen et al. (ALPHA Collaboration)
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G. B. Andresen1, M. D. Ashkezari2, M. Baquero-Ruiz3, W. Bertsche4, P. D. Bowe1, E. Butler4, C. L. Cesar5, S. Chapman3, M. Charlton4, J. Fajans3, T. Friesen6, M. C. Fujiwara7, D. R. Gill7, J. S. Hangst1, W. N. Hardy8, R. S. Hayano9, M. E. Hayden2, A. Humphries4, R. Hydomako6, S. Jonsell4,10, L. Kurchaninov7, R. Lambo5, N. Madsen4, S. Menary11, P. Nolan12, K. Olchanski7, A. Olin7, A. Povilus3, P. Pusa12, F. Robicheaux13, E. Sarid14, D. M. Silveira15,16, C. So3, J. W. Storey7, R. I. Thompson6, D. P. van der Werf4, D. Wilding4, J. S. Wurtele3, and Y. Yamazaki15,16 (ALPHA Collaboration)
1Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark 2Department of Physics, Simon Fraser University, Burnaby BC, V5A 1S6, Canada 3Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300, USA 4Department of Physics, Swansea University, Swansea SA2 8PP, United Kingdom 5Instituto de Física, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-972, Brazil 6Department of Physics and Astronomy, University of Calgary, Calgary AB, T2N 1N4, Canada 7TRIUMF, 4004 Wesbrook Mall, Vancouver BC, V6T 2A3, Canada 8Department of Physics and Astronomy, University of British Columbia, Vancouver BC, V6T 1Z1, Canada 9Department of Physics, University of Tokyo, Tokyo 113-0033, Japan 10Fysikum, Stockholm University, SE-10609, Stockholm, Sweden 11Department of Physics and Astronomy, York University, Toronto, ON, M3J 1P3, Canada 12Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom 13Department of Physics, Auburn University, Auburn, Alabama 36849-5311, USA 14Department of Physics, NRCN-Nuclear Research Center Negev, Beer Sheva, IL-84190, Israel 15Atomic Physics Laboratory, RIKEN Advanced Science Institute, Wako, Saitama 351-0198, Japan 16Graduate School of Arts and Sciences, University of Tokyo, Tokyo 153-8902, Japan

Received 9 April 2010; published 2 July 2010
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Physics
Focus
We report the application of evaporative cooling to clouds of trapped antiprotons, resulting in plasmas with measured temperature as low as 9 K. We have modeled the evaporation process for charged particles using appropriate rate equations. Good agreement between experiment and theory is observed, permitting prediction of cooling efficiency in future experiments. The technique opens up new possibilities for cooling of trapped ions and is of particular interest in antiproton physics, where a precise CPT test on trapped antihydrogen is a long-standing goal.
© 2010 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.105.013003
DOI:
10.1103/PhysRevLett.105.013003
PACS:
37.10.Mn, 52.25.Dg, 52.27.Jt, 64.70.fm
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