Neutronic Analysis Studies of the Spallation Target Window for a Gas Cooled Ads Concept

Some design options for transmutation devices are under consideration, one of them includes a window target cooled by eutectic Lead Bismuth for a gas cooled transmutation core. In this paper we will show the neutronic calculations that we have performed to obtain the heat deposition in the target material, the neutron flux produced in the target and the radiation damage in the structural material for the window target of the gas cooled option of the PDS-XADS project. For the 6 mA – 600 MeV proton beam, the energy deposition in the window structure reaches more than 800 W/cm and more than 2/3 of the total energy of the beam is deposited in the target as heat. The rest of the energy is carried away by the 13 neutrons per proton that enter the surrounding core. The radiation damage and gas production is a very limiting aspect in the design reaching 29 dpa/mA and maximum Hydrogen production of 3000 appm/mA for a full year operation.