Measurement of displacement cross section for high-energy protons and future plan for material damage using 0.4 GeV protons at J-PARC

Meigo, Shinichiro   

Material damage index of displacement per atom (dpa) is calculated by the particle flux and the displacement cross section. Since the experimental data of the displacement cross section was scarce, the measurements using protons were conducted, and the experimental data of protons up to 30 GeV have been obtained in J-PARC. The displacement cross section was almost constant regardless of the projectile proton energy above several GeV, which is against the expectation because the heat deposition given by the proton increases as projectile energy due to the relativistic theory. The experiment with 120 GeV protons at FNAL was conducted to obtain the data for high-energy regions. To extend the energy region, the experiment with 430-GeV protons at HiRadMat is planned for the following year. Additionally, a new beam irradiation facility plan at J-PARC with 0.4-GeV protons to study material radiation damage will be presented in this talk.