Neutron energy spectra from deuterium neutral beam heated plasmas at the Joint European Torus (JET) have been measured with a time-of-flight spectrometer. The different source fractions, resulting from thermal-thermal (TT), beam-thermal (BT) and beam-beam (BB) interactions have been extracted. The measured TT fraction and associated ion temperature is checked for consistency with diagnostic data for electron density n e , effective charge Z eff , ion temperature T i and total neutron emission. Two different ways of comparing the data are represented. Firstly, the measured TT fraction, total neutron emission, n e , Z eff and T e profile shape are used to deduce a consistent T i , which is compared with T i values obtained independently by other diagnostics. Secondly, the measured TT fraction, total neutron emission, n e profile shape and T i are used to determine a consistent thermal deuterium density n D , which is compared with n D obtained from Z eff measurements.
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Olsson et al. (1993) studied this question.
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