TY  - JOUR
AU  - Heinola, K.
AU  - Likonen, J.
AU  - Ahlgren, T.
AU  - Brezinsek, S.
AU  - De Temmerman, G.
AU  - Jepu, I.
AU  - Matthews, G. F.
AU  - Pitts, R. A.
AU  - Widdowson, A.
TI  - Long-term fuel retention and release in JET ITER-Like Wall at ITER-relevant baking temperatures
JO  - Nuclear fusion
VL  - 57
IS  - 8
SN  - 1741-4326
CY  - Vienna
PB  - IAEA
M1  - FZJ-2017-06230
SP  - 086024 -
PY  - 2017
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000404721100002
DO  - DOI:10.1088/1741-4326/aa747e
UR  - https://juser.fz-juelich.de/record/837261
ER  -