On 21 April 2016 in Rokkasho (Japan) a ceremony was held for the installation of the low energy section of a very powerful accelerator (LIPAc) representing a prototype for the International Fusion Material Irradiation Facility (IFMIF). The aim of IFMIF, and of the LIPAc accelerator, is the production of very high intense fluxes of high energy monoenergetic neutrons which are needed for testing the structural resistance of materials to be employed in Nuclear Fusion Reactors.