Dynamics of SOL-divertor plasmas after an ELM crash in tokamak H-mode plasma

Takizuka, Tomonori; Hosokawa, Masanari*

Enhanced particle and heat fluxes to the divertor plates after an ELM crash in H-mode plasmas give the serious load to the plate. We investigate these fluxes with the particle simulation code PARASOL, where an electrostatic PIC method is combined with a Monte-Carlo binary collision model. The electron heat pulse after an ELM crash propagates fast to the plate. Next the ion heat pulse and plasma particle pulse reach the plate slowly with the sound-speed time scale. We study the effect of the ELM-induced-source asymmetry and of the recycling asymmetry on the dynamic behavior of SOL-divertor plasmas. The SOL current plays an important role in the dynamics with the asymmetry.