Radiation damage parameters for modelling of FRM irradiation conditions at the RADEX facility of INR RAS

Results of MC calculations of primary radiation damage generated by the intense proton beam at the RADiation EXperiment (RADEX) facility of the Institute for Nuclear Research, Russian Academy of Sciences (INR RAS) are presented. RADEX is the irradiation channel located inside a proton target at the beam stop of the INR RAS linear proton accelerator having energy up to 600 MeV. The position of the irradiation channel at the facility can be changed by rotation of the proton target relative to the vertical axis, thus varying the relative influence of the primary protons and spallation neutrons on the primary damage kinetics. By shifting the proton target position outside the horizontal beam axis, one may reduce the predominant input of high-energy protons to the irradiation field. As a result, the spectrum of primary knock-on atoms in the irradiated sample may be significantly softened. This gives the possibility of changing irradiation parameters to simulate irradiation conditions at other installations (ITER and DEMO fusion devices and the IFMIF project).