Abstract
The neutral beams (NB) in JT-60U and LHD are unique systems in the world to clarify the physics necessary to realize ITER and future fusion reactors. There were considerable progresses in these years in the plasma physics research utilizing those existing NB systems, which substantially contributed in the ITER and fusion reactor designs. In the meantime, the operation and tests in the existing systems together with the R&D toward ITER have achieved remarkable breakthroughs and milestones, such as achievement of the ITER relevant high power density beams in the MeV accelerator R&D. The R&D results developed for the existing NB systems have now widely spread in the industries, in particular in Hi-Tech device manufacturing processes, and are supporting technological basis of the IT societies.
