The beam source of the MITICA experiment: Strategy adopted, manufacturing design, engineering and fabrication of the main components

•The MITICA (Megavolt ITER injector and concept Advancement) experiment, currently in the installation and commissioning phase at the neutral beam test facility in Padua-Italy, will be equipped with a beam source (BS) expected to generate a 40A negative ion beam to the energy of 1MeV (values for D). It is composed of an ion source to generate a h or d plasma and of a multiple-Aperture multiple-grid (MAMuG) accelerator [1], where ions extracted are accelerated in five consecutive stages of 200 kV each.•The engineering and fabrication of the beam source for MITICA BS started in october 2018, when a contract between fusion for energy (F4E) and alsymex (France) was signed. Presently, all the components and sub-assemblies have been manufactured, except for a few non-critical items. Assembly of the accelerator is well advanced and ion source is on-going.•A review of the fabrication of the main components and aspects of their assembly is reported in this paper, with a focus on the main achievements. The MITICA (Megavolt ITER Injector and Concept Advancement) experiment, currently in the installation and commissioning phase at the Neutral Beam Test Facility in Padua-Italy, will be equipped with a Beam Source (BS) expected to generate a 40A negative ion beam to the energy of 1MeV (values for D). It is composed of an ion source to generate a H or D plasma and of a multiple-Aperture multiple-grid (MAMuG) Accelerator [1], where ions extracted are accelerated in five consecutive stages of 200 kV each. The engineering and fabrication of the beam source for MITICA BS started in October 2018, when a contract between Fusion for Energy (F4E) and Alsymex (France) was signed. Presently, all the components and sub-assemblies have been manufactured, except for a few non-critical items. Assembly of the accelerator is well advanced and ion source is on-going. A review of the fabrication of the main components and aspects of their assembly is reported in this paper, with a focus on the main achievements.