Speaker
Description
High-power proton accelerators with wide energy range between several ten MeV and a few hundred GeV have been used for production of secondary particles with target materials for material science, radiation therapy and physics research. In the design of accelerator facilities, it is important to evaluate the radiation damage quantities of the target material, such as displacement per atom (DPA) and energy deposition, as well as the particle fluences. Monte Carlo (MC) particle transport codes such as FLUKA, MARS, MCNP, and PHITS are widely used to calculate these quantities in accelerator facilities. Even though same nuclear data libraries can be used in some of the above codes, different implementation of the libraries can give different results. Moreover, the nuclear physic models, which are mainly used here to define the nuclear interactions between proton and the target materials since the interested beam energy is higher than nuclear data libraries, are all different in all those codes. Therefore, it is essential to validate the calculation results by comparing the results of radiation damage calculations using these MC codes with each other.
In this work, the following four cases were selected for intercomparison of radiation damage calculations for target materials: 1) a neutron source with 30 MeV protons injected into a beryllium target, 2) a spallation neutron source at LANCE with 800 MeV protons injected into a tungsten target, 3) a neutrino source with 30 GeV protons injected into a graphite target, and 4) an antiproton source at FNAL's pbar target station with 120 GeV protons injected into a copper target. The quantities used for the intercomparison are depth distributions of NRT-DPA (standard index of displacement damage), Arc-DPA (modified index of displacement damage), energy deposition, and particle (proton, neutron, pion+, and pion-) fluence. Results of intercomparison will be presented at the conference.