Abstract
A disc chopper for time-of-flight analysis of fast neutral particles was constructed for the determination of the ion energy spectrum at lower energies than can be obtained by conventional electromagnetic analyzers. The method has been applied to the TORTUR II Tokamak. The chopper and detection system are described and the measurements are presented. For the interpretation of the results of the measurements, a data analysis procedure was developed. The influence of the kinetic effects near the linear wall was shown to be important in the calculations of the neutral density profile at the plasma edge. The neutral energy spectrum in the lower energy range is strongly influenced by this effect.
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