%0 Journal Article
%A Heinola, K.
%A Likonen, J.
%A Ahlgren, T.
%A Brezinsek, S.
%A De Temmerman, G.
%A Jepu, I.
%A Matthews, G. F.
%A Pitts, R. A.
%A Widdowson, A.
%T Long-term fuel retention and release in JET ITER-Like Wall at ITER-relevant baking temperatures
%J Nuclear fusion
%V 57
%N 8
%@ 1741-4326
%C Vienna
%I IAEA
%M FZJ-2017-06230
%P 086024 -
%D 2017
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000404721100002
%R 10.1088/1741-4326/aa747e
%U https://juser.fz-juelich.de/record/837261