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Dynamics of antiproton cooling in a positron plasma during antihydrogen formation |
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| Authors: | ATHENA Collaboration , M. Amoretti, C. Amsler, G. Bonomi, A. Bouchta, P. D. Bowe, C. Carraro, C. L. Cesar, M. Charlton, M. Doser, V. Filippini, A. Fontana, M. C. Fujiwara, R. Funakoshi, P. Genova, J. S. Hangst, R. S. Hayano, L. V. J rgensen, A. Kellerbauer, V. Lagomarsino, R. Landua, D. Lindelof, E. Lodi Rizzini, M. Macrí , N. Madsen, G. Manuzio, P. Montagna, H. Pruys, C. Regenfus, A. Rotondi, G. Testera, A. Variola, L. Venturelli, D. P. van der Werf,Y. Yamazaki |
| Affiliation: | a Istituto Nazionale di Fisica Nucleare, Sezione di Genova, 16146, Genova, Italy b Physik-Institut, University of Zurich, 8057, Zürich, Switzerland c Department of Physics, CERN, 1211, Geneva 23, Switzerland d Department of Physics, University of Wales Swansea, Swansea SA2 8PP, UK e Dipartimento di Fisica, Università di Genova, 16146, Genova, Italy f Instituto de Fisica, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21945-970, Brazil g Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, 27100, Pavia, Italy h Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, 27100, Pavia, Italy i Atomic Physics Laboratory, RIKEN, Saitama 351-0198, Japan j Department of Physics, University of Tokyo, Tokyo 113-0033, Japan k Department of Physics and Astronomy, University of Aarhus, 8000, Aarhus C, Denmark l Dipartimento di Chimica e Fisica per l'Ingegneria e per i Materiali, Università di Brescia, 25123, Brescia, Italy |
| Abstract: | We demonstrate cooling of 104 antiprotons in a dense, cold plasma of 108 positrons, confined in a nested cylindrical Penning trap at about 15 K. The time evolution of the cooling process has been studied in detail, and several distinct types of behavior identified. We propose explanations for these observations and discuss the consequences for antihydrogen production. We contrast these results with observations of interactions between antiprotons and “hot” positrons at about 3000 K, where antihydrogen production is strongly suppressed. |
| Keywords: | Antihydrogen Cooling Nested trap Positron plasma Antiprotons |
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