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The ITER Vertical Neutron Camera (VNC) is a multichannel collimator systemdesigned to measure the neutron emissivity profile and spectra. The energyspectrum measurements of neutrons made by the VNC will contribute to thereconstruction of the ion temperature, fuel ratio, and fast ion distributionfunction. In this paper, the results of neutron spectra calculations for theITER VNC are presented. The developed software allows for the simulation ofparticle spectra resulting from interaction of suprathermal ions with thermalbackground plasma. The method relies on direct reaction rate calculation andexplicit fusion reaction kinematics modelling. The assessment of the D-Tneutron spectra is carried out for D-NBI heated baseline D-T ITER operationscenarios. It is shown that neutron flux resulting from fast (beam) D withthermal T ion interaction dominates at more than 16 MeV part of the spectra.Thus, it is possible to assess fuel ratio based on calculated thermal-thermaland beam-thermal neutron energy spectra. An ability to observe sawtooth-inducedmixing via VNC is studied. Lower energy boundary for the observable part of thesuprathermal ion distribution is derived.

Modelling of the NBI contribution to the neutron energy spectra for the ITER Vertical Neutron Camera