Deuterium retention on the tungsten-coated divertor tiles of JET ITER-like wall in 2015-2016 campaign

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JET Contributors , Lahtinen , A , Likonen , J , Koivuranta , S , Alves , E , Baron-Wiechec , A , Catarino , N , Coad , J P , Heinola , K , Räisänen , J & Widdowson , A 2019 , ' Deuterium retention on the tungsten-coated divertor tiles of JET ITER-like wall in 2015-2016 campaign ' , Fusion Engineering and Design , vol. 146 , pp. 1979-1982 . https://doi.org/10.1016/j.fusengdes.2019.03.081

Title: Deuterium retention on the tungsten-coated divertor tiles of JET ITER-like wall in 2015-2016 campaign
Author: JET Contributors; Lahtinen, A.; Likonen, J.; Koivuranta, S.; Alves, E.; Baron-Wiechec, A.; Catarino, N.; Coad, J. P.; Heinola, K.; Räisänen, J.; Widdowson, A.
Contributor: University of Helsinki, Materials Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2019-09
Language: eng
Number of pages: 4
Belongs to series: Fusion Engineering and Design
ISSN: 0920-3796
URI: http://hdl.handle.net/10138/334439
Abstract: Tungsten-coated divertor files exposed during the third JET ITER-Like Wall (ILW) campaign in 2015-2016 (ILW-3) were studied with Secondary Ion Mass Spectrometry (SIMS). ILW-3 campaign contained more high-power plasma discharges and longer plasma time than the earlier ILW campaigns. Measurements showed increased beryllium (Be) deposition on the upper inner divertor, whereas on the outer divertor, Be deposition was lower than during the second campaign in 2013-2014 (ILW-2). Increased intensifies of nickel, molybdenum and tungsten were observed at the surface layer of the inner divertor Be dominated deposits. These layers are probably formed during the high-power plasma discharge phase near the end of the ILW-3 campaign. Compared to the earlier campaigns, D retention on the upper inner divertor was observed to on a similar level than after ILW-2, whereas at the lower inner divertor and most parts of the outer divertor, D retention was lower for ILW-3 than ILW-2. D retention was increased at lower part of outer divertor Tile 7, where Be deposition was slightly increased. Probable reason for the reduction is the higher surface temperature of the files due to higher powers used.
Subject: JET
Fuel retention
Erosion
Deposition
114 Physical sciences
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