Computer modelling of boundary plasmas in tokamaks.

Details of the numerical modelling and method of the UEDA code which was developed for the analysis of the boundary plasma are described. The code employs a two-dimensional dynamic fluid model for fuel and impurity ions. The transport of the neutral gas is solved with the Monte Carlo method and coupled to the fluid equations. Collision dominated Particle-in-Cell method is utilized for the solution of the fluid equations. Representative numerical results of the edge/divertor plasma behaviour for the present day tokamak machine, and future reactor are shown.