Neutron spectra from beam-heated fusion plasmas

Distributions of the neutrons emerging from a hot fusion plasma, heated by neutral beam injection, are presented. By means of a numerical method neutron energy spectra as functions of the plasma parameters have been obtained. These spectra, if obtained experimentally, contain information regarding the deposition of the beam into the plasma, and the plasma temperature and density. The reasons are that (i) neutron spectra resulting from beam-plasma and plasma-plasma interaction are, for certain parameter ranges, well separated in energy. (ii) neutrons from plasma-plasma interaction provide information about the ion temperature Tsub(i)(R), and, under certain circumstances, the ion density nsub(i)(R). (iii) neutron spectra and reactivities from beam-plasma interaction are strongly dependent on the beam deposition profile as well as on the electron temperature Tsub(e) and plasma effective charge zsub(eff). (Auth.)