The 33 MW TFTR neutral beams

The TFTR (Tokamak Fusion Test Reactor) neutral beam injection system (NBIS) has performed injection experiments on TFTR since 1984. During the 1990 run period the NBIS exceeded previous levels, reaching a record 48 MJ (24 MW for 2 s) of neutral injected energy and, at a later date, a record neutral power of 33 MW, which produced a record plasma neutron source rate. The operation of the NBIS resulting in this performance, the equipment changes and operational improvements from the 1989 operating experience which contributed to achieving this result, and the techniques used to analyze the effects of these changes are discussed