Antiparticle plasmas for antihydrogen trapping

M. Charlton, G. B. Andresen, M. D. Ashkezari, M. Baquero-Ruiz, W. Bertsche, P. D. Bowe, E. Butler, P. T. Carpenter, C. L. Cesar, S. Chapman, S. Eriksson, J. Fajans, T. Friesen, M. C. Fujiwara, D. R. Gill, A. Gutierrez, J. S. Hangst, W. N. Hardy, R. S. Hayano, M. E. HaydenA. J. Humphries, J. L. Hurt, R. Hydomako, S. Jonsell, L. Kurchaninov, N. Madsen, S. Menary, P. Nolan, K. Olchanski, 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

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


Over the last decades it has become routine to form beams of positrons and antiprotons and to use them to produce trapped samples of both species for a variety of purposes. Positrons can be captured efficiently, for instance using a buffer-gas system, and in such quantities to form dense, single component plasmas useful for antihydrogen formation. The latter is possible using developments of techniques for dynamically capturing and then cooling antiprotons ejected from the Antiproton Decelerator at CERN. The antiprotons can then be manipulated by cloud compression and evaporative cooling to form tailored plasmas. We will review recent advances that have allowed antihydrogen atoms to be confined for the first time in a shallow magnetic minimum neutral atom trap superimposed upon the region in which the antiparticles are held and mixed. A new mixing technique has been developed to help achieve this using autoresonant excitation of the centreofmass longitudinal motion of an antiproton cloud. This allows efficient antihydrogen formation without imparting excess energy to the antiprotons and helps enhance the probability of trapping the anti-atom.

Original languageEnglish
Title of host publication17th International Conference on Atomic Processes in Plasmas, ICAPiP
Number of pages10
StatePublished - 25 Jun 2012
Externally publishedYes
Event17th International Conference on Atomic Processes in Plasmas, ICAPiP 2011 - Belfast, United Kingdom
Duration: 19 Jul 201222 Jul 2012

Publication series

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


Conference17th International Conference on Atomic Processes in Plasmas, ICAPiP 2011
Country/TerritoryUnited Kingdom


  • Antihydrogen
  • Non-neutral Plasmas
  • Trapping

ASJC Scopus subject areas

  • General Physics and Astronomy


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