Evaporative cooling of antiprotons for the production of trappable antihydrogen

D. M. Silveira, G. B. Andresen, M. D. Ashkezari, M. Baquero-Ruiz, W. Bertsche, P. D. Bowe, E. Butler, C. L. Cesar, S. Chapman, M. Charlton, J. Fajans, T. Friesen, M. C. Fujiwara, D. R. Gill, J. S. Hangst, W. N. Hardy, M. E. Hayden, R. Hydomako, S. Jonsell, L. KurchaninovN. Madsen, S. Menary, P. Nolan, K. Olchanski, A. Olin, A. Povilus, P. Pusa, F. Robicheaux, E. Sarid, C. So, J. W. Storey, R. I. Thompson, D. P. Van Der Werf, J. S. Wurtele

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


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.

Original languageEnglish
Title of host publicationNon-Neutral Plasma Physics VIII - 10th International Workshop on Non-Neutral Plasmas
Number of pages10
StatePublished - 24 Apr 2013
Externally publishedYes
Event10th International Workshop on Non-neutral Plasmas - Greifswald, Germany
Duration: 27 Aug 201230 Aug 2012

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference10th International Workshop on Non-neutral Plasmas


  • Antihydrogen
  • Penning trap
  • evaporative cooling

ASJC Scopus subject areas

  • General Physics and Astronomy


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