CERN Accelerating science

Experiments at CERN
Title	GBAR
Author(s)	Joubert, J ; Jonsell, S B ; Hervieux, P ; Kim, B ; Rousse, J A ; Perez, P ; Belosevic, I ; Kim, S K ; Szymczyk, K S ; Manfredi, G ; Lefort, H ; Debu, P F ; Mansoulie, B ; Noury, J ; Duval, L ; Sacquin, Y ; Kuroda, N ; Tutan, M S ; Tuchming, B ; Liszkay, L F ; Comini, P ; Crivelli, P ; Blumer, P P ; Dijoux, A M ; Roosa, M J ; Rathi, S ; Vallage, B ; Hilico, L ; Garces sobreira rodrigues baptista, G
Experiment	AD-7
Greybook	See AD-7 experiment
Approved	30 May 2012
Status	Preparation
Collaboration	GBAR
Accelerator	AD
Abstract	The GBAR project aims to perform the first test of the Equivalence Principle with antimatter by measuring the free fall of ultra-cold antihydrogen atoms. The objective is to measure the gravitational acceleration to better than a percent in a first stage, with a long term perspective to reach a much higher precision using gravitational quantum states of antihydrogen. The production of  20 µK atoms proceeds via sympathetic cooling of H${+} ions by Be${+} ions. H${+} ions are produced via a two-step process, involving the interaction of bursts of 10${7} slow antiprotons from the AD-ELENA at CERN with a dense positronium cloud.
Related document(s)	CERN-SPSC-2011-029  (SPSC-P-342)

Contact: Perez, P