Deuterium trapping and release in JET ITER-like wall divertor tiles

Jari Likonen; K. Heinola; A. De Backer; Seppo Koivuranta; Antti Hakola; C. F. Ayres; A. Baron-Wiechec; P. Coad; G. F. Matthews; M. Mayer; A. Widdowson; JET Contributors

doi:10.1088/0031-8949/T167/1/014074

Deuterium trapping and release in JET ITER-like wall divertor tiles

Jari Likonen (Corresponding Author), K. Heinola, A. De Backer, Seppo Koivuranta, Antti Hakola, C. F. Ayres, A. Baron-Wiechec, P. Coad, G. F. Matthews, M. Mayer, A. Widdowson, JET Contributors

Research output: Contribution to journal › Article › Scientific › peer-review

20 Citations (Scopus)

Abstract

A selected set of samples from JET-ILW divertor tiles exposed in 2011-2012 has been analysed using thermal desorption spectrometry (TDS). The highest amount of deuterium was found on the regions with the thickest deposited layers, i.e. on the horizontal (apron) part and on the top part of Tile 1, which resides deep in the scrape-off layer. Outer divertor Tiles 6, 7 and 8 had nearly an order of magnitude less deuterium. The co-deposited layers on the JET tiles and the W coatings contain C, O and Ni impurities which may change the desorption properties. The D₂ signals in the TDS spectra were convoluted and the positions of the peaks were compared with the Be and C amounts but no correlations between them were found. The remaining fractions of D in the analysed samples at ITER baking temperature 350 °C are rather high implying that co-deposited films may be difficult to be de-tritiated.

Original language	English
Article number	014074
Journal	Physica Scripta
Volume	2016
Issue number	T167
DOIs	https://doi.org/10.1088/0031-8949/T167/1/014074
Publication status	Published - 25 Jan 2016
MoE publication type	A1 Journal article-refereed

Keywords

deuterium
JET
retention

Access to Document

10.1088/0031-8949/T167/1/014074

Cite this

@article{ab6204f2d9dd421594ce392a3d2f213e,

title = "Deuterium trapping and release in JET ITER-like wall divertor tiles",

abstract = "A selected set of samples from JET-ILW divertor tiles exposed in 2011-2012 has been analysed using thermal desorption spectrometry (TDS). The highest amount of deuterium was found on the regions with the thickest deposited layers, i.e. on the horizontal (apron) part and on the top part of Tile 1, which resides deep in the scrape-off layer. Outer divertor Tiles 6, 7 and 8 had nearly an order of magnitude less deuterium. The co-deposited layers on the JET tiles and the W coatings contain C, O and Ni impurities which may change the desorption properties. The D2 signals in the TDS spectra were convoluted and the positions of the peaks were compared with the Be and C amounts but no correlations between them were found. The remaining fractions of D in the analysed samples at ITER baking temperature 350 °C are rather high implying that co-deposited films may be difficult to be de-tritiated.",

keywords = "deuterium, JET, retention",

author = "Jari Likonen and K. Heinola and {De Backer}, A. and Seppo Koivuranta and Antti Hakola and Ayres, {C. F.} and A. Baron-Wiechec and P. Coad and Matthews, {G. F.} and M. Mayer and A. Widdowson and {JET Contributors}",

year = "2016",

month = jan,

day = "25",

doi = "10.1088/0031-8949/T167/1/014074",

language = "English",

volume = "2016",

journal = "Physica Scripta",

issn = "0031-8949",

publisher = "Institute of Physics IOP",

number = "T167",

}

TY - JOUR

T1 - Deuterium trapping and release in JET ITER-like wall divertor tiles

AU - Likonen, Jari

AU - Heinola, K.

AU - De Backer, A.

AU - Koivuranta, Seppo

AU - Hakola, Antti

AU - Ayres, C. F.

AU - Baron-Wiechec, A.

AU - Coad, P.

AU - Matthews, G. F.

AU - Mayer, M.

AU - Widdowson, A.

AU - JET Contributors

PY - 2016/1/25

Y1 - 2016/1/25

N2 - A selected set of samples from JET-ILW divertor tiles exposed in 2011-2012 has been analysed using thermal desorption spectrometry (TDS). The highest amount of deuterium was found on the regions with the thickest deposited layers, i.e. on the horizontal (apron) part and on the top part of Tile 1, which resides deep in the scrape-off layer. Outer divertor Tiles 6, 7 and 8 had nearly an order of magnitude less deuterium. The co-deposited layers on the JET tiles and the W coatings contain C, O and Ni impurities which may change the desorption properties. The D2 signals in the TDS spectra were convoluted and the positions of the peaks were compared with the Be and C amounts but no correlations between them were found. The remaining fractions of D in the analysed samples at ITER baking temperature 350 °C are rather high implying that co-deposited films may be difficult to be de-tritiated.

AB - A selected set of samples from JET-ILW divertor tiles exposed in 2011-2012 has been analysed using thermal desorption spectrometry (TDS). The highest amount of deuterium was found on the regions with the thickest deposited layers, i.e. on the horizontal (apron) part and on the top part of Tile 1, which resides deep in the scrape-off layer. Outer divertor Tiles 6, 7 and 8 had nearly an order of magnitude less deuterium. The co-deposited layers on the JET tiles and the W coatings contain C, O and Ni impurities which may change the desorption properties. The D2 signals in the TDS spectra were convoluted and the positions of the peaks were compared with the Be and C amounts but no correlations between them were found. The remaining fractions of D in the analysed samples at ITER baking temperature 350 °C are rather high implying that co-deposited films may be difficult to be de-tritiated.

KW - deuterium

KW - JET

KW - retention

UR - http://www.scopus.com/inward/record.url?scp=84959894956&partnerID=8YFLogxK

U2 - 10.1088/0031-8949/T167/1/014074

DO - 10.1088/0031-8949/T167/1/014074

M3 - Article

AN - SCOPUS:84959894956

SN - 0031-8949

VL - 2016

JO - Physica Scripta

JF - Physica Scripta

IS - T167

M1 - 014074

ER -

Deuterium trapping and release in JET ITER-like wall divertor tiles

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this