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Jeffrey S. Hangst

Evaporative cooling of antiprotons for the production of trappable antihydrogen

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  • D.M. Silveira, Universidade Federal do Rio de Janeiro
  • ,
  • G.B. Andresen
  • M.D. Ashkezari, Simon Fraser University
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  • M. Baquero-Ruiz, University of California
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  • W. Bertsche, University of Manchester
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  • P.D. Bowe, Danmark
  • E. Butler, PH Department
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  • C.L. Cesar, Universidade Federal do Rio de Janeiro
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  • S. Chapman, University of California
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  • M. Charlton, Swansea University
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  • J. Fajans, University of California
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  • T. Friesen, University of Calgary, Danmark
  • Masatoshi Fujiwara, Asia Research Centre, Danmark
  • D.R. Gill, 4004 Wesbrook Mall
  • ,
  • J.S. Hangst
  • W.N. Hardy, University of British Columbia
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  • M.E. Hayden, Simon Fraser University
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  • R. Hydomako, University of Calgary
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  • S. Jonsell, Stockholm University
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  • L. Kurchaninov, 4004 Wesbrook Mall
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  • N. Madsen, Swansea University, Danmark
  • S. Menary, York University
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  • P. Nolan, University of Liverpool
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  • K. Olchanski, 4004 Wesbrook Mall
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  • A. Olin, TRIUMF, Canada
  • A. Povilus, University of California
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  • P. Pusa, University of Liverpool
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  • F. Robicheaux, Auburn University
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  • E. Sarid, NRCN-Nuclear Research Center Negev
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  • C. So, University of California
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  • J.W. Storey, 4004 Wesbrook Mall
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  • R.I. Thompson, University of Calgary
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  • D.P. Van Der Werf, Swansea University
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  • J.S. Wurtele, University of California
We describe the implementation of evaporative cooling of charged particles in the ALPHA apparatus. Forced evaporation has been applied to cold samples of antiprotons held in Malmberg-Penning traps. Temperatures on the order of 10 K were obtained, while retaining a significant fraction of the initial number of particles. We have developed a model for the evaporation process based on simple rate equations and applied it succesfully to the experimental data. We have also observed radial re-distribution of the clouds following evaporation, explained by simple conservation laws. We discuss the relevance of this technique for the recent demonstration of magnetic trapping of antihydrogen.
OriginalsprogEngelsk
TidsskriftA I P Conference Proceedings Series
Vol/bind1521
Sider (fra-til)165-174
Antal sider10
ISSN0094-243X
DOI
StatusUdgivet - 1 jan. 2013

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