Conference Paper/Proceeding/Abstract 973 views
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...
| Published in: | LEAP 2011 |
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| Published: |
Vancouver
Springer
2013
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| 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. |
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| College: |
Faculty of Science and Engineering |
| Start Page: |
61 |
| End Page: |
67 |