A scanning instrument to measure the optical profile of a high-power neutral beam is described. The instrument is capable of both spectral and spatial resolution of Doppler-shifted Balmer-alpha radiation from the beam. To interpret the line-integral data from the scanner a theoretical model giving both the three-dimensional beam particle density and expected (line-integral) optical profiles is presented. By fitting empirical light profiles to experimental data, it is shown how information on beam divergence, beam steering, uniformity and hydrogenic species ratios can be obtained.
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Geoff Cottrell (1982) studied this question.
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