Reactive-diffusive transport of hydrogen in the porous three-dimensional structure of co-deposited films was simulated using a kinetic Monte Carlo method. The simulations were carried out on samples generated from the film growth Monte Carlo code which simulated the film-growth process in remote regions of fusion devices. It was seen that the steric repulsion between the incoming hydrocarbon and the surface atoms was an important parameter which affects the structure and trap concentrations of these soft films. Initial results included that diffusion of hydrogen through pores in the co-deposited films could be a major contributor to the high density of hydrogen in co-deposits seen at remote locations of fusion devices.

Dynamic Monte-Carlo Modeling of Hydrogen Isotope Diffusion in Co-Deposited Layers. A.Rai, P.N.Maya, R.Schneider, S.P.Deshpande, M.Warrier: Journal of Nuclear Materials, 2007, 363-365[1-3], 1272-6