The NPI cyclotron-based fast neutron facility

For validating activation cross-section data in the energy range relevant to IFMIF (International Fusion Material Irradiation Facility), the fast neutron sources were developed utilizing the NPI variable-energy cyclotron U-120M. Novel concept of source reaction was investigated for a generation of the white - (IFMIF-like) - spectrum on NPI cyclotron. The deuteron break-up process induced by 37MeV protons onflowing heavy water target was found to produce neutrons with high intensity, mean energy of 14MeV and spectrum extending to 32MeV. The small-size samples (diameter of 15mm) are irradiated at neutron flux up to 10 11 n/cm 2 /s in this source. The quasi-monoenergetic neutron field in the energy range from 20 to 35MeV is produced using standard 7 Li(p,n) reaction on thin (carbon backed) lithium foil. The p-Li source produces neutron flux up to 10 9 n/cm 2 /s. The present work deals with methodical, technical and functional characteristics of p-D2O and p- 7 Li neutron sources. The determination of spectral flux at position of irradiated samples is described in details. A summary of present and next program of experiments is outlined.