Abstract
This paper describes a new diagnostic technique to decode information contained in the spectral and spatial distribution of photons emitted by fast neutral beam particles and provide an estimate of the 2-D beam density distribution function in a cross-sectional slice. By scanning Doppler-shifted Hα radiation from the fast beam particles at a number of peripheral locations around the beam axis, tomographic reconstructions of the beam distribution with spatial resolution Δx≂2 cm and time resolution Δt≂10 ms can be made. Using a maximum entropy reconstruction algorithm (making no symmetry assumptions), experimental reconstructions are presented of the 2-D profile of the beam generated by the prototype JET source for each of the Doppler-shifted line radiation components. Applications of this image processing technique in other areas of high-temperature plasma diagnostic development are discussed briefly.
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