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- W2326471720 abstract "The recycling of D ions impinging onto a W divertor surface is a key input parameter into the power and momentum balance at the target boundary during SOL modeling. It is described by the ratio R of the flux of recombining D2 molecules to the non-reflected incident ion flux. In steady-state plasmas where the surface is in equilibrium with the incident flux, R equals one due to particle conservation. However, during transient events such as edge localized modes (ELMs) the evolution of R with time is not straightforward to predict. Therefore, detailed diffusion-trapping calculations were performed taking into account the variations in power influx and particle energy during an ELM. They showed that in contrast to the naive expectation, that the ELM would deplete the surface and subsequently lead to 'pumping' (R 1) of the incident flux by the empty surface, R ≈ 1 or even R occurs. This paper will first describe how the ELM was approximated in the 1D diffusion-trapping code and then discuss the evolution of R during an ELM and in the inter ELM phase. Also, an analytical picture of R will be developed which allows qualitatively understanding the evolution of R as calculated by the diffusion-trapping code." @default.
- W2326471720 created "2016-06-24" @default.
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- W2326471720 date "2016-01-12" @default.
- W2326471720 modified "2023-09-27" @default.
- W2326471720 title "Diffusion-trapping modelling of hydrogen recycling in tungsten under ELM-like heat loads" @default.
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- W2326471720 doi "https://doi.org/10.1088/0031-8949/t167/1/014025" @default.
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