Long-term fuel retention and release in JET ITER-Like Wall at ITER-relevant baking temperatures

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http://hdl.handle.net/10138/214441

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Heinola , K , Likonen , J , Ahlgren , T , Brezinsek , S , De Temmerman , G , Jepu , I , Matthews , G F , Pitts , R A , Widdowson , A & JET Contributors 2017 , ' Long-term fuel retention and release in JET ITER-Like Wall at ITER-relevant baking temperatures ' , Nuclear Fusion , vol. 57 , no. 8 , 086024 . https://doi.org/10.1088/1741-4326/aa747e

Title: Long-term fuel retention and release in JET ITER-Like Wall at ITER-relevant baking temperatures
Author: Heinola, K.; Likonen, J.; Ahlgren, T.; Brezinsek, S.; De Temmerman, G.; Jepu, I.; Matthews, G. F.; Pitts, R. A.; Widdowson, A.; JET Contributors
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2017-08
Language: eng
Number of pages: 6
Belongs to series: Nuclear Fusion
ISSN: 0029-5515
URI: http://hdl.handle.net/10138/214441
Abstract: The fuel outgassing efficiency from plasma-facing components exposed in JET-ILW has been studied at ITER-relevant baking temperatures. Samples retrieved from the W divertor and Be main chamber were annealed at 350 and 240 degrees C, respectively. Annealing was performed with thermal desoprtion spectrometry (TDS) for 0, 5 and 15 h to study the deuterium removal effectiveness at the nominal baking temperatures. The remained fraction was determined by emptying the samples fully of deuterium by heating W and Be samples up to 1000 and 775 degrees C, respectively. Results showed the deposits in the divertor having an increasing effect to the remaining retention at temperatures above baking. Highest remaining fractions 54 and 87% were observed with deposit thicknesses of 10 and 40 mu m, respectively. Substantially high fractions were obtained in the main chamber samples from the deposit-free erosion zone of the limiter midplane, in which the dominant fuel retention mechanism is via implantation: 15 h annealing resulted in retained deuterium higher than 90%. TDS results from the divertor were simulated with TMAP7 calculations. The spectra were modelled with three deuterium activation energies resulting in good agreement with the experiments.
Subject: fuel retention
ITER
deposition
divertor
main chamber
JET-ILW
114 Physical sciences
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