| The main divertor material in the fusion reactor ITER will be W. During operation, it will be continuously bombarded by a very high flux of D and T ions from the fusion plasma. As T is radioactive, it is crucial to understand the buildup and retention properties of D and T in W. We are carrying out a multiscale modelling effort where DFT is used to determine the trapping and detrapping coefficients of D in defects in W, MD and BCA to calculate the penetration depths, lattice KMC to understand the divacancy mobility properties, and rate equations to model the diffusion of D under experimental annealing conditions. The rate equation results show very good agreement with experiments on D migration, and determine that the majority of D is in monovacancies after implantation at keV energies. |
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