Interpretation of neutron rate measurements for fusion plasmas with deuterium injection

In this work different models for the calculation of ion distribution functions for the numerical investigation of fusion reactivities are introduced and compared. The most important results of a systematic examination concerning its limits and parametrical dependence are discussed. It follows that the neutron rate during deuterium injection sensitively depends on the deuteron density, the electron temperature and the injection power, so that the errors in measurement of the profiles and of the central values strongly influence the calculated neutron rates, especially in tokamak operation. These considerations and the results of the parametric study lead to the definition of a parametric range, within which a determination of temperature and density from measurements of the neutron rates is meaningful and possible in the framework of the errors. The application of the Fokker-Planck-calculations for JET-Tokamak is presented. In the cases investigated the calculated temperatures and densities do agree well with the experimental results, the calculation accuracy of the density in the case of low deuteron densities is better than that yielded by the other experimental methods. (orig.)