Neutron emission study of DT plasmas heated with tritium neutral beams

The neutron emission energy spectrum from deuterium-tritium fusion reaction s has been measured in experiments carried out at the Joint European Torus for plasmas heated with high power neutral beam (NB) injection of tritium b eams at E-b approximate to 150 keV using a magnetic proton recoil neutron s pectrometer. High quality data were obtained in which up to three spectral components due to different ion reactions could be distinguished with the h elp of dedicated model calculations of the fusion neutron emission based on Monte Carlo simulations. The analysis model involved neutrons from reactio ns of NB ions on passing and trapped orbits interacting with thermal bulk i ons. Moreover, a narrow Gaussian component, due to neutrons from thermal d + t --> alpha + n reactions, could be resolved in some cases. Results are p resented and the plasma information obtained is discussed as an illustratio n of the capabilities of neutron emission spectroscopy diagnostics. (C) 200 1 American Institute of Physics.