We present the physics and the antihydrogen production strategy of the AEGIS experiment at CERN. This strategy is based on a series of steps in which positronium (Ps), produced by e+ impinging on a porous target, is laser excited to high-n (Rydberg) levels and then made to interact with ultracold antiprotons (around 100mK). An antihydrogen beam is then formed by Stark acceleration to be sent through a Moiŕe deflectometer to measure g for antimatter. The efficiency of the antihydrogen production process depends critically on the positronium excitation process which will be described in detail in the paper. The Ps cloud is produced within a relatively strong magnetic field at 1 T, with a consequent deep modification of Rydberg levels structure. A two-step laser light excitation is proposed, and the physics of the problem is discussed. We derive simple expressions giving the Ps excitation probability with feasible laser pulses suitably tailored in power and spectral bandwidth.

Laser driven positronium excitation in the AEGIS antimatter experiment at CERN / F. Castelli, M. G. Giammarchi - In: Physics with many positrons : proceedings of the International School of Physics Enrico Fermi : course 174. : Varenna on Lake Como, Villa Monastero, 7-17 July 2009 / [a cura di] A. Dupasquier, A. P. Mills jr., R. S. Brusa. - Bologna : Societa' italiana di fisica, 2010 Dec. - ISBN 978-1-60750-646-1. - pp. 311-336 (( Intervento presentato al 174. convegno International school of physics Enrico Fermi : Physics with many positrons tenutosi a Varenna nel 2009.

Laser driven positronium excitation in the AEGIS antimatter experiment at CERN

F. Castelli
Primo
;
2010

Abstract

We present the physics and the antihydrogen production strategy of the AEGIS experiment at CERN. This strategy is based on a series of steps in which positronium (Ps), produced by e+ impinging on a porous target, is laser excited to high-n (Rydberg) levels and then made to interact with ultracold antiprotons (around 100mK). An antihydrogen beam is then formed by Stark acceleration to be sent through a Moiŕe deflectometer to measure g for antimatter. The efficiency of the antihydrogen production process depends critically on the positronium excitation process which will be described in detail in the paper. The Ps cloud is produced within a relatively strong magnetic field at 1 T, with a consequent deep modification of Rydberg levels structure. A two-step laser light excitation is proposed, and the physics of the problem is discussed. We derive simple expressions giving the Ps excitation probability with feasible laser pulses suitably tailored in power and spectral bandwidth.
Settore FIS/03 - Fisica della Materia
Settore FIS/04 - Fisica Nucleare e Subnucleare
dic-2010
International school of physics Enrico Fermi
Book Part (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/152433
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