EXA2011

After the first production of cold antihydrogen by the ATHENA and ATRAP collaborations, second generation experiments are being performed for measuring the fundamental properties of this antiatom. AEGIS (Antimatter Experiment:Gravity, Interferometry, Spectroscopy) is an experiment with the goal of measuring the gravitational interaction between matter and antimatter with help of a pulsed, cold Antihydrogen beam. In AEGIS, antihydrogen will be produced by charge exchange reactions of cold antiprotons with positronium atoms excited in a Rydberg state(n>20). In the first phase of the experiment, controlled acceleration by an electric field gradient (Stark acceleration) and subsequent measurement of free fall in a Moire deflectometer will allow a test of the gravity weak equivalence principle. In a second phase, CPT studies and detailed spectroscopy will become possible. In the present talk, after a general description, the present status of the experiment will be reviewed.