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Kinetic modelling of divertor fluxes during ELMs in ITER

Hosokawa, Masanari*; Loarte, A.*; Huijsmans, G.*; Takizuka, Tomonori*; Hayashi, Nobuhiko

The Type I ELMy H-mode is the reference inductive operation for ITER, but the periodic ELM power loads on plasma facing components need to be understood and controlled. Understanding of the mechanisms of ELM particle and heat loads is required: electron/ion contributions, in/out asymmetry and timescale of ELM heat fluxes. Modelling of typical edge plasma conditions during ITER ELMs has been carried out with PARASOL (PARticle Advanced code for SOL and divertor plasmas) code, which has been developed in JAEA. Simulations show that ions carry larger heat flux than electrons for large ELM particle loss, whereas ions and electrons deposit comparable heat flux for small ELM particle loss. The total energy loss to the two divertors is similar for the two divertors for ELM energy loss larger than 10 MJ independent inter-ELM divertor conditions. Even though inner peak heat flux is larger than outer one in some cases, inner time-integrated heat load is smaller than outer one. This is due to strong current flow in SOL during ELM.

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