The AEgIS experiment at CERN for the measurement of antihydrogen gravity acceleration

Scampoli, Paola; Storey, James William (2014). The AEgIS experiment at CERN for the measurement of antihydrogen gravity acceleration. Modern Physics Letters A, 29(17), p. 1430017. World Scientific Publishing 10.1142/S0217732314300171

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The Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEgIS) experiment
is conducted by an international collaboration based at CERN whose aim is to
perform the first direct measurement of the gravitational acceleration of antihydrogen
in the local field of the Earth, with Δg/g = 1% precision as a first achievement. The
idea is to produce cold (100 mK) antihydrogen ( ¯H) through a pulsed charge exchange
reaction by overlapping clouds of antiprotons, from the Antiproton Decelerator (AD)
and positronium atoms inside a Penning trap. The antihydrogen has to be produced in
an excited Rydberg state to be subsequently accelerated to form a beam. The deflection
of the antihydrogen beam can then be measured by using a moir´e deflectometer coupled
to a position sensitive detector to register the impact point of the anti-atoms through
the vertex reconstruction of their annihilation products. After being approved in late
2008, AEgIS started taking data in a commissioning phase in 2012. This paper presents
an outline of the experiment with a brief overview of its physics motivation and of the
state-of-the-art of the g measurement on antimatter. Particular attention is given to the
current status of the emulsion-based position detector needed to measure the ¯H sag in
AEgIS.

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