The mastery of nuclear Fusion and the construction of the ITER tokamak will inevitably involve a number of challenges. The WEST tokamak is dealing with one of them already: the divertor.
WEST (acronym derived from W Environment in Steady-state Tokamak, where W is the chemical symbol for tungsten) is the transformation of the Tore Supra tokamak from a limiter to a divertor configuration.