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

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http://hdl.handle.net/10138/300873

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Heinola , K , Ahlgren , T , Brezinsek , S , Vuoriheimo , T & Wiesen , S 2019 , ' Modelling of the effect of ELMs on fuel retention at the bulk W divertor of JET ' , Nuclear Materials and Energy , vol. 19 , pp. 397-402 . https://doi.org/10.1016/j.nme.2019.03.013

Title: Modelling of the effect of ELMs on fuel retention at the bulk W divertor of JET
Author: Heinola, K.; Ahlgren, T.; Brezinsek, S.; Vuoriheimo, T.; Wiesen, S.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Materials Physics
Date: 2019-05
Language: eng
Number of pages: 6
Belongs to series: Nuclear Materials and Energy
ISSN: 2352-1791
URI: http://hdl.handle.net/10138/300873
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.
Subject: 114 Physical sciences
ELM
Fuel retention
Multi-scale computing
JET
HYDROGEN
TUNGSTEN
SIMULATION
DEUTERIUM RETENTION
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