PLASMA SHIELD FORMATION AND DIVERTOR PLATE EROSION FOR ITER TOKAMAK PLASMA DISRUPTIONS

During plasma disruptions and ELMs a plasma shield from vaporized targ et material is formed in front oi the divertor plates within a few mic roseconds which protects the divertor against further excessive evapor ation. For calculation of plasma shield formation and material erosion the one dimensional (1 D) radiation magnetohydrodynamics (MHD) code F OREV-1 with 1 1/2 D MHD model was developed, Experimental results on p lasma shield formation obtained at the 2MK-200 disruption simulation f acility were used to check the adequacy of the physical models used in FOREV-1, It was demonstrated that the theoretical models adequately d escribe the complex physical processes during plasma shield formation. Plasma shield formation and material erosion iii a tokamak is a 2 D p roblem requiring a 2 1/2 D MHD model. For modeling of this situation t he 2 D code FOREV-2 is under development, First results are presented here.