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Antihydrogen formation by autoresonant excitation of antiproton plasmas / William Alan Bertsche, G. B Andresen, M. D Ashkezari, M Baquero-Ruiz, P. D Bowe, P. T Carpenter, E Butler, C. L Cesar, S. F Chapman, M Charlton, 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 Hayden, A. 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, Niels Madsen

LEAP 2011, Pages: 61 - 67

Swansea University Author: Niels Madsen

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DOI (Published version): 10.1007/978-94-007-5530-7_7

Abstract

In efforts to trap antihydrogen, a key problem is the vast disparity between the neutral trap energy scale (˜ 50 \upmueV), and the energy scales associated with plasma confinement and space charge ( 1 eV). In order to merge charged particle species for direct recombination, the larger energy scale m...

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Published in: LEAP 2011
Published: Vancouver Springer 2013
URI: https://cronfa.swan.ac.uk/Record/cronfa15091
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Abstract: In efforts to trap antihydrogen, a key problem is the vast disparity between the neutral trap energy scale (˜ 50 \upmueV), and the energy scales associated with plasma confinement and space charge ( 1 eV). In order to merge charged particle species for direct recombination, the larger energy scale must be overcome in a manner that minimizes the initial antihydrogen kinetic energy. This issue motivated the development of a novel injection technique utilizing the inherent nonlinear nature of particle oscillations in our traps. We demonstrated 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 or tenuous 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. The nature of this injection overcomes some of the difficulties associated with matching the energies of the charged species used to produce antihydrogen.
College: College of Science
Start Page: 61
End Page: 67