CERN Accelerating science

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Title	AE$\bar g$IS Experiment: Measuring the acceleration $g$ of the earth's gravitational field on antihydrogen beam
Author(s)	Subieta Vasquez, M A (INFM, Brescia ; INFN, Pavia) ; Aghion, S (Milan Polytechnic ; INFN, Milan) ; Ahlen, O (CERN) ; Amsler, C (Bern U., LHEP) ; Ariga, A (Bern U., LHEP) ; Ariga, T (Bern U., LHEP) ; Belov, A S (Moscow, INR) ; Bonomi, G (INFM, Brescia ; INFN, Pavia) ; Bräunig, P (Kirchhoff Inst. Phys.) ; Bremer, J (CERN) ; Brusa, R S (INFN, Trento ; Trento U.) ; Cabaret, L (U. Paris-Sud, Orsay) ; Caccia, M (INFN, Milan) ; Canali, C (Zurich U.) ; Caravita, R (INFM, Brescia ; INFN, Pavia ; INFN, Milan) ; Castelli, F (INFM, Brescia ; INFN, Pavia ; INFN, Milan) ; Cerchiari, G (INFM, Brescia ; INFN, Pavia ; INFN, Milan) ; Cialdi, S (Milan U.) ; Comparat, D (U. Paris-Sud, Orsay) ; Consolati, G (Milan Polytechnic ; INFN, Milan) ; Dassa, L (INFM, Brescia) ; Derking, J H (CERN) ; Domizio, S Di (INFN, Genoa) ; Noto, L Di (INFN, Trento ; Trento U.) ; Doser, M (CERN) ; Dudarev, A (CERN) ; Ereditato, A (Bern U., LHEP) ; Ferragut, R (Milan Polytechnic ; INFN, Milan) ; Fontana, A (INFN, Pavia) ; Genova, P (CERN) ; Giammarchi, M (Milan U. ; INFN, Milan) ; Gligorova, A (Bergen U.) ; Gninenko, S N (Moscow, INR) ; Heider, S (CERN) ; Hogan, S D (University Coll. London) ; Huse, T (Oslo U.) ; Jordan, E (Heidelberg, Max Planck Inst.) ; Jørgensen, L V (CERN) ; Kaltenbacher, T (CERN) ; Kawada, J (Bern U., LHEP) ; Kellerbauer, A (Heidelberg, Max Planck Inst.) ; Kimura, M (Bern U., LHEP) ; Knecht, A (CERN) ; Krasnicky, D (INFN, Genoa ; Genoa U.) ; Lagomarsino, V (INFN, Genoa ; Genoa U.) ; Mariazzi, S (INFN, Trento ; Trento U.) ; Matveev, V A (Dubna, JINR) ; Merkt, F (Zurich, ETH) ; Moia, F (Milan Polytechnic ; INFN, Milan) ; Nebbia, G (INFN, Padua) ; Nedelec, P (Lyon, IPN) ; Oberthaler, M K (Kirchhoff Inst. Phys.) ; Pacifico, N (Bergen U.) ; Petracek, V (Prague, Tech. U.) ; Pistilo, C (Bern U., LHEP) ; Prelz, F (INFN, Milan) ; Prevedelli, M (Bologna U.) ; Regenfus, C (Zurich U.) ; Ricardi, C (INFN, Pavia ; Pavia U.) ; Røhne, O (Oslo U.) ; Rotondi, A (INFN, Pavia ; Pavia U.) ; Sandaker, H (Bergen U.) ; Scampoli, P (Bern U., LHEP ; Naples U.) ; Storey, J (Bern U., LHEP) ; Spacek, M (Prague, Tech. U.) ; Testera, G (INFN, Genoa) ; Trezzi, D (INFN, Milan) ; Vaccarone, R (INFN, Genoa) ; Villa, F (Milan U.) ; Zavatarelli, S (INFN, Genoa)
Publication	2014
Number of pages	9
In:	EPJ Web Conf. 71 (2014) 00128
In:	2nd International Conference on New Frontiers in Physics, Kolymbari, Greece, 28 Aug - 5 Sep 2013, pp.00128
DOI	10.1051/epjconf/20147100128
Subject category	Physics in General
Abstract	The AE [??] IS experiment [1] aims at directly measuring the gravitational acceleration g on a beam of cold antihydrogen ( [??] ) to a precision of 1%, performing the first test with antimatter of the (WEP) Weak Equivalence Principle. The experimental apparatus is sited at the Antiproton Decelerator (AD) at CERN, Geneva, Switzerland. After production by mixing of antiprotons with Rydberg state positronium atoms (Ps), the [??] atoms will be driven to fly horizontally with a velocity of a few 100 ms^-1 for a path length of about 1 meter. The small deflection, few tens of mum, will be measured using two material gratings (of period   80 mum) coupled to a position-sensitive detector working as a moire deflectometer similarly to what has been done with matter atoms [2]. The shadow pattern produced by the [??] beam will then be detected by reconstructing the annihilation points with a spatial resolution (  2 mum) of each antiatom at the end of the flight path by the sensitive-position detector. During 2012 the experimental apparatus has been commissioned with antiprotons and positrons. Since the AD will not be running during 2013,during the refurbishment of the CERN accelerators, the experiment is currently working with positrons, electrons and protons, in order to prepare the way for the antihydrogen production in late 2014.
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