Description of a four angle time-of-flight spectrometer for studying neutron scattering in the energy range from 8 to 15 MeV

Neutron cross sections in the energy range from 8 to 15 MeV are frequently requested mainly for fission and fusion reactor development and for nuclear safety applications. As a consequence a four angle time-of-flight fast neutron spectrometer has been designed and realized. Incident neutrons are produced using the Super EN tandem Van de Graaff accelerator installed at the Centre d'Etudes de Bruyeres-le-Chatel and either deuterium or tritium gas targets. An auxiliary facility consisting in a 150 kV pulsed accelerator enables the production of 14.9 MeV energy primary neutron fluxes and the use of the same experimental set-up. Complete description and main characteristics of the apparatus are presented along with some experimental results