Modeling of the impact of runaway electrons on the ILW in JET

Abstract A major concern for ITER operation in H-mode with high fusion gain is the occurrence of disruptions which can damage plasma-facing components (PFCs) and therefore limit their lifetime. Moreover, runaway electrons (REs) can be generated and produce additional damage to the first wall. The closest experiments to study and verify numerical codes for ITER is JET ITER-like wall experiments with Be first wall and W divertor. Predictive numerical simulations of RE impact on the typical Be tiles are performed using the codes ENDEP and MEMOS. This work is focused on estimations of after effects of RE impact on the JET Be first wall (FW) and determination of critical parameters of RE beams resulting in melting of Be tiles. Simulations predict that Be PFC melting can occur at relatively low current density of RE beam ranged between 2 and 12 kA/m 2 .