Update on the Negative Ion Based Neutral Beam Injectors for ITER

The ITER baseline foresees 2 Heating Neutral Beams (HNB's) operating at 1 MeV 40 A D-0, each capable of delivering 16.5 MW of deuterium neutrals to the plasma, with a 3rd HNB injector foreseen as an upgrade option that would bring up the total neutral beam power to 50NW [1]. In addition a dedicated Diagnostic Neutral Beam (DNB) will be injecting 100 keV 60 A of H-0 for charge exchange recombination spectroscopy (CXRS) [2]. This paper highlights the impact of the staged approach on the ITER NBI, presents the new installation strategy and reports on the status of the adopted design refinements and the integration of the HNB's and the DNB into the ITER plant.