Modelling of the effect of ELMs on fuel retention at the bulk W divertor of JET

Heinola, K.; Wiesen, S.; Ahlgren, T.; Brezinsek, S.; Vuoriheimo, T.

doi:10.1016/j.nme.2019.03.013

Journal Article

FZJ-2019-02756

Modelling of the effect of ELMs on fuel retention at the bulk W divertor of JET

Heinola, K. (Corresponding author) ; Ahlgren, T. ; Brezinsek, S.FZJ* ; Vuoriheimo, T. ; Wiesen, S.FZJ*

2019
Elsevier Amsterdam [u.a.]

Nuclear materials and energy 19, 397 - 402 (2019) [10.1016/j.nme.2019.03.013]

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Please use a persistent id in citations: http://hdl.handle.net/2128/22102 doi:10.1016/j.nme.2019.03.013

Abstract: Effect of ELMs on fuel retention at the bulk W target of JET ITER-Like Wall was studied with multi-scale calculations. Plasma input parameters were taken from ELMy H-mode plasma experiment. The energetic intra-ELM fuel particles get implanted and create near-surface defects up to depths of few tens of nm, which act as the main fuel trapping sites during ELMs. Clustering of implantation-induced vacancies were found to take place. The incoming flux of inter-ELM plasma particles increases the different filling levels of trapped fuel in defects. The temperature increase of the W target during the pulse increases the fuel detrapping rate. The inter-ELM fuel particle flux refills the partially emptied trapping sites and fills new sites. This leads to a competing effect on the retention and release rates of the implanted particles. At high temperatures the main retention appeared in larger vacancy clusters due to increased clustering rate.

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