Neutron physics calculations for ADS targets

The LAHET Code System (LCS) is used to investigate the neutron physics of a liquid lead target hit by a high energy proton beam. The main goals of the performed analysis are the calculation of the spatial dependence of the energy deposition in the beam window and in the liquid lead target and the calculation of the neutron flux density spectra in the beam window and in different zones of the target. Moreover, the reaction products (nucleons, mesons, deuterons, tritons, 3He, α-particles and residual nuclei) which result from the spallation process in a lead-bismuth target are investigated. Some of the calculations mentioned above have also been carried out with the beta test version of the MCNPX code, provided by LANL/USA, that was established by merging of LAHET and MCNP. In the Appendix, calculations for neutron flux density spectra up to 1 GeV in different regions (target, inner and outer core region, radial blanket) of an accelerator-driven system (ADS) are presented. The results described in this report were used for the thermohydraulic layout of the window- and target-cooling and contributed to benchmark intercomparisons. (orig.)