Conference Paper/Proceeding/Abstract 666 views
Antihydrogen formation by autoresonant excitation of antiproton plasmas
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
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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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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