Speaker
Description
The material displacement damage index of displacement per atom (dpa) is obtained by the particle flux and the displacement cross section. However, the experimental data of the displacement cross section was scarce, so our group conducted the measurement using proton beams. So far, the experimental data of protons up to 30 GeV were obtained using FFAG at Kyoto University, RCNP at Osaka University, and RCS and MR at J-PARC. In the projectile protons energy region above several GeV, it was found that the cross section was almost constant regardless of the energy. This tendency is against the expectation because the heat deposition given by the proton increases as projectile energy due to the relativistic theory. We conducted the experiment with 120 GeV protons at Fermi National Laboratory (FNAL) to obtain the data for high-energy regions. The first experiment was successfully finished by February 2023. The experimental data will be presented as a rapid communication. We will experiment with 430-GeV protons at HiRadMat in CERN to extend the energy region. Additionally, a new facility plan at J-PARC with 400-MeV protons to study material radiation damage will be presented in this talk.
