Doppler-shift emission tomography of intense neutral beams

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Abstract
Describes an optical diagnostic which will make it possible to reconstruct the two-dimensional intensity profile of a neutral beam with a time resolution of a few milliseconds. Using Doppler-shift techniques, each neutral species in the beam can be mapped separately and, if used in conjunction with a simple neutral power calibration diagnostic the spatial distribution of neutral power density in a simulated tokamak duct region can be measured. Numerical reconstructions, based on the maximum-entropy method of expected two-dimensional beam profiles are presented. With 12 H alpha scanners round the periphery of the beam, each having effectively 60 photon detectors, the beam profile can be reconstructed accurately down to the 1% peak power level.

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