The experimental performance of a high-brightness neutral-beam system is described which has been designed and manufactured by Culham Laboratory under contract to the Princeton Plasma Physics Laboratory. The neutral beam serves as a diagnostic on the PBX-M experiment and is used to perform studies of high-bet a, bean-shaped, neutral-beam-heated plasmas, and plasmacurrent profile shaping using ion Bernstein wave and lower hybrid rf systems. A maximum extracted current of ~ 2.7 A of positive hydrogen ions at 80 keY has been obtained from a multiaperture extraction system.
