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Neutral beam injection (NBI) system of the thermonuclear neutron source DEMO-FNS is suggested for plasma heating and current drive by means of high energy atoms injection. Six neutral beam injectors will provide DEMO-FNS machine with 30MW of a steady-state additional heating power, with neutral particles energy 500 keV. NBI systems developed for ITER are assumed as a prototype for DEMOFNS NBI, as both injectors employ the similar ion source current, with the total beam power in ITER NBI (1MeV) being twice as large as in DEMO-FNS. The injector scheme incorporates a negative ions source coupled with accelerator delivering D beam accelerated to 500keV with the current 40A. The subsequent neutralization and ions removal from the beam, as well as its further path to plasma lead to a significant distance between beam source and injection point (~20 m).

MODELLING AND OPTIMIZATION OF NEUTRAL BEAM INJECTORS FOR FUSION NEUTRON SOURCE DEMO-FNS