Displacement damage study in tungsten and iron for fusion neutron irradiation

•The EDX of outgoing particles and recoil atoms from Fe and W are calculated with the TALYS code.•The MD simulations of damage cascade caused by the self-recoil of up to 200 keV damage energies are performed for Fe and W.•The Arc-dpa parameters are calibrated with the results of the MD Simulations.•The displacement damage cross section of iron and tungsten are calculated using the Arc-dpa and NRT approach.•The dpa values in iron and tungsten are calculated for different neutron fields of fusion reactor. In the present paper, displacement damage in tungsten and iron are studied using the TALYS-1.8 code and molecular dynamics simulations. The TALYS-1.8 code is used to predict the energy spectra of recoils. The MD simulations of self-recoils of up to 200 keV damage energies are carried out to predict the number of Frenkel pairs in iron and tungsten using the LAMMPS code. Time evolution of vacancies and interstitials are studied and discussed. The results of MD simulations are used to calibrate the constant parameters of the Arc-dpa method. The displacement damage cross section of tungsten and iron are calculated for the neutron irradiation of up to 15 MeV energy with the NRT and Arc-dpa approaches. The dpa (Arc-dpa) value at the first wall location of EU DEMO reaches 1.19 dpa/FPY and 0.93 dpa/FPY in iron and tungsten, respectively. Similarly, dpa values in iron and tungsten are also predicted at different neutron fields using the NRT and Arc-dpa mechanism.