Microanalysis of deposited layers in the divertor of JET following operations with carbon wall

H. Bergsåker (Corresponding Author), P. Petersson, I. Bykov, G. Possnert, Jari Likonen, Seppo Koivuranta, Paul Coad, A.M. Widdowson, JET-EFDA Contributors

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

Abstract

Elemental mapping of cross sections of deposited layers on inboard tiles in the JET divertor after exposure to plasma operations with carbon wall are presented.
The study was made using microbeam ion beam analysis methods in combination with optical microscopy and SEM.
The surfaces had been exposed to plasma through different periods of operation (1998–2007, 2007–2009 and 1998–2009). The texture and composition of the layers are non-uniform. The physical structures include columnar, lamellar and disordered globular appearances.
The distribution of trapped deuterium was frequently found to be lamellar, with well-defined sub layers with higher deuterium concentration. However, 3D regions with dimensions of about 100 μm with enhanced deuterium content were also found, both at the layer surfaces and in the layer cross sections.
The distributions of beryllium and Inconel components were lamellar but did not otherwise show large non-uniformity on the same scale length as the deuterium.
Original languageEnglish
Pages (from-to)S668-S672
JournalJournal of Nuclear Materials
Volume438
Issue numberSupplement
DOIs
Publication statusPublished - 2012
MoE publication typeA4 Article in a conference publication
Event20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices - Aachen, Aachen, Germany
Duration: 21 May 201225 May 2012

Fingerprint

Deuterium
Microanalysis
microanalysis
deuterium
Carbon
carbon
Beryllium
Plasmas
Inconel (trademark)
microbeams
tiles
cross sections
Tile
beryllium
nonuniformity
Ion beams
Optical microscopy
surface layers
textures
Textures

Cite this

Bergsåker, H. ; Petersson, P. ; Bykov, I. ; Possnert, G. ; Likonen, Jari ; Koivuranta, Seppo ; Coad, Paul ; Widdowson, A.M. ; Contributors, JET-EFDA. / Microanalysis of deposited layers in the divertor of JET following operations with carbon wall. In: Journal of Nuclear Materials. 2012 ; Vol. 438, No. Supplement. pp. S668-S672.
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title = "Microanalysis of deposited layers in the divertor of JET following operations with carbon wall",
abstract = "Elemental mapping of cross sections of deposited layers on inboard tiles in the JET divertor after exposure to plasma operations with carbon wall are presented. The study was made using microbeam ion beam analysis methods in combination with optical microscopy and SEM. The surfaces had been exposed to plasma through different periods of operation (1998–2007, 2007–2009 and 1998–2009). The texture and composition of the layers are non-uniform. The physical structures include columnar, lamellar and disordered globular appearances. The distribution of trapped deuterium was frequently found to be lamellar, with well-defined sub layers with higher deuterium concentration. However, 3D regions with dimensions of about 100 μm with enhanced deuterium content were also found, both at the layer surfaces and in the layer cross sections. The distributions of beryllium and Inconel components were lamellar but did not otherwise show large non-uniformity on the same scale length as the deuterium.",
author = "H. Bergs{\aa}ker and P. Petersson and I. Bykov and G. Possnert and Jari Likonen and Seppo Koivuranta and Paul Coad and A.M. Widdowson and JET-EFDA Contributors",
year = "2012",
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Bergsåker, H, Petersson, P, Bykov, I, Possnert, G, Likonen, J, Koivuranta, S, Coad, P, Widdowson, AM & Contributors, JET-EFDA 2012, 'Microanalysis of deposited layers in the divertor of JET following operations with carbon wall', Journal of Nuclear Materials, vol. 438, no. Supplement, pp. S668-S672. https://doi.org/10.1016/j.jnucmat.2013.01.141

Microanalysis of deposited layers in the divertor of JET following operations with carbon wall. / Bergsåker, H. (Corresponding Author); Petersson, P.; Bykov, I.; Possnert, G.; Likonen, Jari; Koivuranta, Seppo; Coad, Paul; Widdowson, A.M.; Contributors, JET-EFDA.

In: Journal of Nuclear Materials, Vol. 438, No. Supplement, 2012, p. S668-S672.

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

TY - JOUR

T1 - Microanalysis of deposited layers in the divertor of JET following operations with carbon wall

AU - Bergsåker, H.

AU - Petersson, P.

AU - Bykov, I.

AU - Possnert, G.

AU - Likonen, Jari

AU - Koivuranta, Seppo

AU - Coad, Paul

AU - Widdowson, A.M.

AU - Contributors, JET-EFDA

PY - 2012

Y1 - 2012

N2 - Elemental mapping of cross sections of deposited layers on inboard tiles in the JET divertor after exposure to plasma operations with carbon wall are presented. The study was made using microbeam ion beam analysis methods in combination with optical microscopy and SEM. The surfaces had been exposed to plasma through different periods of operation (1998–2007, 2007–2009 and 1998–2009). The texture and composition of the layers are non-uniform. The physical structures include columnar, lamellar and disordered globular appearances. The distribution of trapped deuterium was frequently found to be lamellar, with well-defined sub layers with higher deuterium concentration. However, 3D regions with dimensions of about 100 μm with enhanced deuterium content were also found, both at the layer surfaces and in the layer cross sections. The distributions of beryllium and Inconel components were lamellar but did not otherwise show large non-uniformity on the same scale length as the deuterium.

AB - Elemental mapping of cross sections of deposited layers on inboard tiles in the JET divertor after exposure to plasma operations with carbon wall are presented. The study was made using microbeam ion beam analysis methods in combination with optical microscopy and SEM. The surfaces had been exposed to plasma through different periods of operation (1998–2007, 2007–2009 and 1998–2009). The texture and composition of the layers are non-uniform. The physical structures include columnar, lamellar and disordered globular appearances. The distribution of trapped deuterium was frequently found to be lamellar, with well-defined sub layers with higher deuterium concentration. However, 3D regions with dimensions of about 100 μm with enhanced deuterium content were also found, both at the layer surfaces and in the layer cross sections. The distributions of beryllium and Inconel components were lamellar but did not otherwise show large non-uniformity on the same scale length as the deuterium.

U2 - 10.1016/j.jnucmat.2013.01.141

DO - 10.1016/j.jnucmat.2013.01.141

M3 - Article in a proceedings journal

VL - 438

SP - S668-S672

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

IS - Supplement

ER -