The AEGIS experiment at CERN
After the first production of cold antihydrogen by the ATHENA and ATRAP experiments ten years ago, new second-generation experiments are aimed at measuring the fundamental properties of this anti-atom. The goal of AEGIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is to test the weak equivalence principle by studying the gravitational interaction between matter and antimatter with a pulsed, cold antihydrogen beam. The experiment is currently being assembled at CERN’s Antiproton Decelerator. In AEGIS, antihydrogen will be produced by charge exchange of cold antiprotons with positronium excited to a high Rydberg state (n > 20). An antihydrogen beam will be produced by controlled acceleration in an electric-field gradient (Stark acceleration). The deflection of the horizontal beam due to its free fall in the gravitational field of the earth will be measured with a moiré deflectometer. Initially, the gravitational acceleration will be determined to a precision of 1%, requiring the detection of about 105 antihydrogen atoms. In this paper, after a general description, the present status of the experiment will be reviewed.
KeywordsAntimatter Antihydrogen Gravity Matter interferometry Deflectometry Weak equivalence principle
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- 3.Fairbank, W.M., et al.: In: Bertotti, B. (ed.) International School of Physics “Enrico Fermi”, p. 310. Academic Press, New York (1974)Google Scholar
- 7.Drobychev, G., et al.: Proposal to the SPS Experiments Committee CERN-SPSC-2007-017, CERN. http://cdsweb.cern.ch/record/1037532 (2007)
- 22.Zehnder, L.: Z. Instrumentenkd. 11, 275 (1891)Google Scholar
- 23.Mach, L.: Z. Instrumentenkd. 12, 89 (1892)Google Scholar