Conceptual design of the neutral beam injection system for the 2000MWt tokamak reactor

The design of a neutral beam injection system for the 2000MWt tokamak fusion reactor is described. It consists of ion source, neutralizing gas cell, ion deflection magnet, energy converter, magnetic shield and evacuation system, with consideration on power efficiency and processing of the cold gas. Twenty-four neutral beams are introduced into the reactor through 12 injection ports in the blanket, perpendicular to the axis of a plasma. A net input power of 30MW with energy 120keV should be absorbed in the relatively low density plasma of 3x1013cm-3 in the initial heating phase. (auth.)