Speaker
Description
Abstract
In fusion reactor design, neutron leaks intensively from blanket material through a gap. In this streaming phenomenon, back scattering cross section is known to be very crucial. In the present study, the author’s team carried out a new experiment for benchmarking the large-angle scattering cross section of tungsten using a DT neutron source of OKTAVIAN facility, Osaka University, Japan. Tungsten containing material is under consideration as the radiation shield in fusion reactor. The experimental geometry consists of a DT neutron source, two shadow bars, niobium foil, and tungsten target. Four irradiations were performed at neutron energy of 14 MeV using DT neutrons to extract only the contribution of large-angle scattering cross section. By using two shadow bars, room return contribution was effectively suppressed. Consequently, only back scattering neutrons were measured by using a niobium foil. In the present benchmark study, obtained experimental data were compared with numerical calculations by MCNP5 using various nuclear data libraries including JENDL-4.0, JEFF-3.3, and ENDF/B-VIII.
Keywords: benchmark, scattering cross section, tungsten, back scattering, 14 MeV, OKTAVIAN.