We demonstrate controllable excitation of the center-of-mass longitudinal motion of a thermal antiproton plasma using a swept-frequency autoresonant drive. When the plasma is cold, dense, and highly collective in nature, we observe that the entire system behaves as a single-particle nonlinear oscillator, as predicted by a recent theory. In contrast, only a fraction of the antiprotons in a warm plasma can be similarly excited. Antihydrogen was produced and trapped by using this technique to drive antiprotons into a positron plasma, thereby initiating atomic recombination
Andresen, G. B.Ashkezari, M. D.Baquero-Ruiz, M.Bertsche, W.Bowe, P. D.Butler, E.Carpenter, P. T.Cesar, C. L.Chapman, S.Charlton, M.Fajans, J.Friesen, T.Fujiwara, M. C.Gill, D. R.Hangst, J. S.Hardy, W. N.Hayden, M. E.Humphries, A. J.Hurt, J. L.Hydomako, R.Jonsell, SvanteMadsen, N.Menary, S.Nolan, P.Olchanski, K.Olin, A.Povilus, A.Pusa, P.Robicheaux, F.Sarid, E.Silveira, D. M.So, C.Storey, J. W.Thompson, R. I.van der Werf, D. P.Wurtele, J. S.Yamazaki, Y.