RADIATION TRANSPORT EFFECTS IN DIVERTOR PLASMAS GENERATED DURING A TOKAMAK REACTOR DISRUPTION

Vaporization of material from tokamak diverters during disruptions is a critical issue for tokamak reactors from ITER to commercial power pl ants. Radiation transport from the vaporized material onto the remaini ng divertor surface plays an important role in the total mass loss to the divertor. Radiation transport in such a vapor is very difficult to calculate in full detail, and this paper quantifies the sensitivity o f the divertor mass loss to uncertainties in the radiation transport. Specifically, the paper presents the results of computer simulations o f the vaporization of a graphite coated divertor during a tokamak disr uption with ITER CDA parameters. The results show that a factor of 100 change in the radiation conductivity changes the mass loss by more th an a factor of two.