Testing the Weak Equivalence Principle with an antimatter beam at CERN

Kimura, Mitsuhiro; Aghion, S.; Amsler, Claude; Ariga, Akitaka; Ariga, Tomoko; Belov, A.; Bonomi, G.; Bräunig, P.; Bremer, J.; Brusa, R. S.; Cabaret, L.; Caccia, M.; Caravita, R.; Castelli, F.; Cerchiari, G.; Chlouba, K.; Cialdi, S; Comparat, D; Consolati, G; Demetrio, A; ... (2015). Testing the Weak Equivalence Principle with an antimatter beam at CERN. Journal of Physics: Conference Series, 631(012047), 012047. Institute of Physics Publishing IOP 10.1088/1742-6596/631/1/012047

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The goal of the AEgIS experiment is to measure the gravitational acceleration of antihydrogen – the simplest atom consisting entirely of antimatter – with the ultimate precision of 1%. We plan to verify the Weak Equivalence Principle (WEP), one of the fundamental laws of nature, with an antimatter beam. The experiment consists of a positron accumulator, an antiproton trap and a Stark accelerator in a solenoidal magnetic field to form and accelerate a pulsed beam of antihydrogen atoms towards a free-fall detector. The antihydrogen beam passes through a moir ́e deflectometer to measure the vertical displacement due to the gravitational force. A position and time sensitive hybrid detector registers the annihilation points of the antihydrogen atoms and their time-of-flight. The detection principle has been successfully tested with antiprotons and a miniature moir ́e deflectometer coupled to a nuclear emulsion detector.

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