Microanalysis of deposited layers in the inner divertor of JET with ITER-like wall

Y. Zhou, H. Bergsåker, I. Bykov, P. Petersson, G. Possnert, J. Likonen, J. Pettersson, S. Koivuranta, A. Widdowson

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

In JET with ITER-like wall, beryllium eroded in the main chamber is transported to the divertor and deposited mainly at the horizontal surfaces of tiles 1 and 0 (high field gap closure, HFGC). These surfaces are tungsten coated carbon fibre composite (CFC). Surface sampleswere collected following the plasma operations in 2011-2012 and 2013-2014 respectively. The surfaces, as well as polished cross sections of the deposited layers at the surfaces have been studied with micro ion beam analysis methods (µ-IBA).Deposition of Beand other impurities, and retention of D is microscopically inhomogeneous. Impurities and trapped deuterium accumulate preferentially in cracks, pits and depressed regions, and at the sides of large pits in the substrate (e.g. arc tracks where the W coating has been removed). With careful overlaying of µ-NRA elemental maps with optical microscopy images, it is possible to separate surface roughness effects from depth profiles at microscopically flat surface regions.
Original languageEnglish
Pages (from-to)412-417
Number of pages6
JournalNuclear Materials and Energy
Volume12
Early online date2017
DOIs
Publication statusPublished - 1 Aug 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

Microanalysis
microanalysis
surface roughness effects
impurities
Impurities
fiber composites
Beryllium
tiles
beryllium
carbon fibers
Tungsten
Deuterium
closures
Tile
deuterium
flat surfaces
tungsten
cracks
arcs
Ion beams

Keywords

  • carbon
  • carbon fibers
  • fusion reactor divertors
  • Ion beams
  • surface roughness
  • deposited layer
  • elemental maps
  • flat surfaces
  • horizontal surfaces
  • Ion beam analysis
  • plasma operations
  • surface roughness effects
  • tungsten coated carbon

Cite this

Zhou, Y. ; Bergsåker, H. ; Bykov, I. ; Petersson, P. ; Possnert, G. ; Likonen, J. ; Pettersson, J. ; Koivuranta, S. ; Widdowson, A. / Microanalysis of deposited layers in the inner divertor of JET with ITER-like wall. In: Nuclear Materials and Energy. 2017 ; Vol. 12. pp. 412-417.
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title = "Microanalysis of deposited layers in the inner divertor of JET with ITER-like wall",
abstract = "In JET with ITER-like wall, beryllium eroded in the main chamber is transported to the divertor and deposited mainly at the horizontal surfaces of tiles 1 and 0 (high field gap closure, HFGC). These surfaces are tungsten coated carbon fibre composite (CFC). Surface sampleswere collected following the plasma operations in 2011-2012 and 2013-2014 respectively. The surfaces, as well as polished cross sections of the deposited layers at the surfaces have been studied with micro ion beam analysis methods (µ-IBA).Deposition of Beand other impurities, and retention of D is microscopically inhomogeneous. Impurities and trapped deuterium accumulate preferentially in cracks, pits and depressed regions, and at the sides of large pits in the substrate (e.g. arc tracks where the W coating has been removed). With careful overlaying of µ-NRA elemental maps with optical microscopy images, it is possible to separate surface roughness effects from depth profiles at microscopically flat surface regions.",
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year = "2017",
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Zhou, Y, Bergsåker, H, Bykov, I, Petersson, P, Possnert, G, Likonen, J, Pettersson, J, Koivuranta, S & Widdowson, A 2017, 'Microanalysis of deposited layers in the inner divertor of JET with ITER-like wall', Nuclear Materials and Energy, vol. 12, pp. 412-417. https://doi.org/10.1016/j.nme.2017.02.015

Microanalysis of deposited layers in the inner divertor of JET with ITER-like wall. / Zhou, Y.; Bergsåker, H.; Bykov, I.; Petersson, P.; Possnert, G.; Likonen, J.; Pettersson, J.; Koivuranta, S.; Widdowson, A.

In: Nuclear Materials and Energy, Vol. 12, 01.08.2017, p. 412-417.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Zhou, Y.

AU - Bergsåker, H.

AU - Bykov, I.

AU - Petersson, P.

AU - Possnert, G.

AU - Likonen, J.

AU - Pettersson, J.

AU - Koivuranta, S.

AU - Widdowson, A.

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KW - deposited layer

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KW - flat surfaces

KW - horizontal surfaces

KW - Ion beam analysis

KW - plasma operations

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KW - tungsten coated carbon

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JF - Nuclear Materials and Energy

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