Modeling D retention in W under D ions and neutrons irradiation

► An improved cluster dynamics model has been developed to study the effect of D retention in W. ► The competition of trapping and diffusion effects dominates the behaviors of D in W. ► Ion-induced and natural defects give rise to the features of the depth distribution of D in W. ► Neutron synergistic irradiation changes the depth distribution but the amount of D retained in W.