Neutron beam imaging with an XY-micromegas detector at n_TOF at CERN

A micromegas detector with a segmented anode in two orthogonal directions, equipped with a neutron/charged particle converter, was developed by a joint effort at CEA and CERN. This 'XY-micromegas' allows the determination of a neutron beam image on an area of 6×6 cm2 with a spatial resolution of 0.5 mm as a function of neutron time of flight (n_TOF). The experimental results collected in three years of operation at the n_TOF facility are summarized together with a comparison with simulations performed by means of the FLUKA code.