Comparison of elastic and non-elastic displacement damage under light ion simulation irradiation

In order to simulate fusion neutron displacement damage, irradiations with light ions can be used. For this purpose irradiations of iron with protons and alpha-particles were experimentally and theoretically investigated. The main emphasis was put on the behavior of displacement damage production caused by high-energetic recoils induced by charged particle nuclear reactions. Evaluation of excitation functions and mean recoil ranges lead to non-elastic PKA-spectra. The comparison between charged particle and fusion neutron induced PKA-spectra points out, that the charged particle-induced non-elastic fraction contributes a considerable part to the PKA-spectra. The closest fit was found for the 20 MeV proton-induced PKA-spectrum. Further comparisons of DPA-data show, that at the highest examined energies the non-elastic/total DPA-ratio is 0.43 for protons and 0.47 for alpha-particles.