Evaporative Cooling of Antiprotons to Cryogenic Temperatures — arXiv2

Evaporative Cooling of Antiprotons to Cryogenic Temperatures

physics.plasm-ph

/ Published

Sep 23, 2010

/ Categories

physics.plasm-ph hep-ex nucl-ex physics.acc-ph physics.atom-ph

/ Links

/ Authors

ALPHA Collaboration, G. B. Andresen, M. D. Ashkezari, M. Baquero-Ruiz, W. Bertsche, P. D. Bowe, E. Butler, C. L. Cesar, S. Chapman, M. Charlton

and 30 more authors

J. Fajans, T. Friesen, M. C. Fujiwara, D. R. Gill, J. S. Hangst, W. N. Hardy, R. S. Hayano, M. E. Hayden, A. Humphries, R. Hydomako, S. Jonsell, L. Kurchaninov

, F. Robicheaux

, D. M. Silveira

, R. I. Thompson

, D. P. van der Werf

, J. S. Wurtele

/ Abstract

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 \emph{CPT} test on trapped antihydrogen is a long-standing goal.