Abstract
Extensive and informative plasma measurements have been made with the intense and energetic neutral-particle beams that are used for fueling and heating magnetically confined, controlled-fusion experimental plasmas. This diagnostic technique does not perturb the plasma because only the unused transmitted fraction of a neutral beam is detected. Orthogonal arrays of highly collimated detectors of the simple secondary-electron-emission type are used in magnetic-mirror experiments to measure neutral-beam attenuation (directly related to the plasma line density) along chords through the plasma volume at different radial and axial positions. Data from these arrays yield radial and axial plasma-density profiles, ion angular distributions at the plasma midplane, estimates of the neutral-beam input power to the plasma, and information on macroscopic plasma motion. Representative results obtained by applying this useful diagnostic technique to the recently completed tandem-mirror experiment TMX are included here. This diagnostic method can also be advantageously applied to other controlled-fusion experiments that use neutral-beam injection.
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