This thesis presents a simplified model of the neutral particle transport at the divertor
of the Wendelstein 7-X stellarator. The model uses the angular coefficient method
implemented in the commercial software COMSOL Multiphysics to calculate the
neutral particle transport as a free molecular flow. The location of the neutral particle
origin is derived by coupling the simulation to the plasma edge code EMC3-Lite. The
presented simulation is capable of quantifying the amount of reionised particles, the
particle flux entering the sub-divertor region and the contribution of different wall
components to the neutral particle transport in a few CPU minutes. A preliminary
validation of the simulation shows that the results are comparable to experimental
and EMC3-Eirene values.
