Context:
The interaction between carbon divertor and hydrogen plasma is investigated by molecular dynamics simulation. Polycrystalline graphite materials are employed for the divertor plates in LHD. The polycrystalline graphite consists of many single crystalline graphites whose crystal axes are disordered. Furthermore, the single crystalline graphite has the structure which many graphene sheets are stacked. It means that the hydrogen plasma which perpendicularly entered into the divertor plate has an oblique incident angle for each graphene sheet. This study, therefore, the reaction rates of reflection, penetration and adsorption, and their physical mechanism are revealed by investigating the incident angle dependence of hydrogen atom injection into a graphene sheet.