Plasma shield formation and divertor plate erosion for ITER tokamak plasma disruptions

During plasma disruptions and ELMs a plasma shield from vaporized target material is formed in front oi the divertor plates within a few microseconds which protects the divertor against further excessive evaporation. For calculation of plasma shield formation and material erosion the one dimensional (1 D) radiation magnetohydrodynamics (MHD) code FOREV-1 with 1 1/2 D MHD model was developed, Experimental results on plasma shield formation obtained at the 2MK-200 disruption simulation facility were used to check the adequacy of the physical models used in FOREV-1, It was demonstrated that the theoretical models adequately describe the complex physical processes during plasma shield formation. Plasma shield formation and material erosion iii a tokamak is a 2 D problem requiring a 2 1/2 D MHD model. For modeling of this situation the 2 D code FOREV-2 is under development, First results are presented here.