This title appears in the Scientific Report :
2017
Please use the identifier:
http://dx.doi.org/10.1088/1741-4326/aa747e in citations.
Long-term fuel retention and release in JET ITER-Like Wall at ITER-relevant baking temperatures
Long-term fuel retention and release in JET ITER-Like Wall at ITER-relevant baking temperatures
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 °C, respectively. Annealing was performed with thermal desoprtion spectrometry...
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Personal Name(s): | Heinola, K. (Corresponding author) |
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Likonen, J. / Ahlgren, T. / Brezinsek, S. / De Temmerman, G. / Jepu, I. / Matthews, G. F. / Pitts, R. A. / Widdowson, A. | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Nuclear fusion, 57 (2017) 8, S. 086024 - |
Imprint: |
Vienna
IAEA
2017
|
DOI: |
10.1088/1741-4326/aa747e |
Document Type: |
Journal Article |
Research Program: |
Plasma-Wall-Interaction |
Publikationsportal JuSER |
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 °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 °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 μm, 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. |