Speaker
Description
As a material-damage index due to the radiation, displacement per atom (dpa) is used widely, which is given by the particle fluence and the displacement cross section. The displacement cross section can be obtained by the electrical resistivity change of target materials due to the proton irradiation by the Matthiessen rule. The sample had to be cooled at cryogenic temperature to observe the very small resistivity change and sustain the damage. To obtain the cross section data, J-PARC and JAEA conducted experiments using protons in the kinetic energy range from 100 MeV to 120 GeV. The experimental results were compared with the calculation based on the Norgett-Robinson-Torrens model (NRT-dpa), which is widely utilized to determine the dpa. A recent model based on the athermal recombination corrected model (arc-dpa) showed good agreement with the experiment. It is of interest to compare the experimental cross section with the calculation model at high energy, where relativistic effects increase energy deposition. To obtain the experimental data, an experiment at CERN HiRadMat using 440 GeV protons was conducted. In this session, the preliminary results are cross-validated with Monte-Carlo simulations, using the well benchmarked program PHITS and FLUKA. It was found that PHITS and FLUKA calculations with arc-dpa reproduced the experiment well. On the contrary, the NRT-dpa calculation overestimates the experimental data. Also, future plans will be discussed in the session.
Funding Agency
This project has been supported by JSPS KAKENHI Grant Numbers JP22K04992 and the European Union’s Horizon Europe research and innovation program under grant agreement No 101057511.
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