Measurement of neutral beam profiles on DIII-D inner wall armor tiles using scanning infrared optics

Characteristic thermal footprints made by energetic neutral beams on the inner-wall graphite tiles of the DIII-D tokamak have been examined using infrared scanning optical detectors. Horizontal and vertical neutral-beam widths are measured from the IR scanner images, and the corresponding divergence angles are estimated and compared to those obtained from calorimetry techniques. Neutral-beam injected power is estimated using a one-dimensional heat flow model and temperature data from an IR scanner.<>