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International audienceThe Gravitational Behaviour of Antihydrogen at Rest experiment - GBAR - is designed to perform a direct measurement of the weak equivalence principle on antimatter by measuring the acceleration ((g) over bar) of antihydrogen atoms in free fall. Its originality is to produce (H) over bar (+) ions and use sympathetic cooling to minimize the initial velocity. These ions are produced using charge exchange reactions with a dense positronium cloud, created by an intense pulse of electron-linac-produced positrons that are accumulated in a Penning-Malmberg trap

First results of a new positron-accumulation scheme using an electron linac and a Penning-Malmberg trap