Numerical study of graphene protective properties for copper, iron, or tungsten substrates under different types of irradiation (proton, alpha particles, and particle clusters)

Numerically the positron lifetime values for a graphene coated metal, in particular, copper, iron, and tungsten substrate were obtained. Similarly, such values for a single vacancy filled with impurities, hydrogen or helium, coming from the irradiation with proton or alpha particles, respectively are also reported. We have for a graphene-Cu - 131ps, graphene-Fe - 119 ps, and for graphene-W - 126 ps, while for a single metal vacancy near the graphene coating we have - 194 ps, 186 ps, 209 ps, correspondingly. A comparison is made with the case of a metal slabs under same conditions. The momentum distribution shape S and W parameters have also been calculated, and reported here. A general trend discussion in relation to the dependence of the S and W parameters, as well as the positron lifetime on the number of impurities in the single metal vacancy is given. This results have been obtained within the Local Density Approximation method. A modeling relevant to the reactor plasma dusting from the walls is performed by molecular dynamics simulation of the impact of energetic copper clusters on the surface coated with the graphene. A protective influence of the graphene coating leads to the decreased destruction of the bulk from the impacting cluster.

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