Tungsten redistribution patterns in ASDEX Upgrade

K. Krieger (Corresponding Author), Jari Likonen, M. Mayer, R. Pugno, V. Rohde, Elizaveta Vainonen-Ahlgren

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

In ASDEX Upgrade tungsten is used as a high-Z plasma facing material. Its erosion, migration and subsequent deposition have been studied by analysis of a set of customised marker tiles, which was installed in the divertor and at the central column for one experimental campaign. Erosion rates were determined at the central column, which was the main tungsten source in that campaign. Deposition rates were determined at the central column and in the divertor region. The W-deposition in the divertor is strongly correlated to the local strike point exposure time. In contrast to low-Z wall materials, where deposition occurs mainly in the inner divertor, tungsten is found in similar quantities also in the outer divertor. The total amount of tungsten deposited outside the central column is about 40% of the gross W-source at the central column. One possible explanation for the 60% undetected tungsten might be the prompt local redeposition of eroded W atoms.
Original languageEnglish
Pages (from-to)10 - 16
Number of pages7
JournalJournal of Nuclear Materials
Volume337 - 339
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

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Tungsten
tungsten
erosion
Erosion
tiles
Tile
Deposition rates
markers
Plasmas
Atoms
atoms

Keywords

  • ASDEX upgrade
  • erosion
  • deposition
  • first wall
  • impurity transport
  • tungsten
  • ITER
  • JET
  • fusion energy

Cite this

Krieger, K., Likonen, J., Mayer, M., Pugno, R., Rohde, V., & Vainonen-Ahlgren, E. (2005). Tungsten redistribution patterns in ASDEX Upgrade. Journal of Nuclear Materials, 337 - 339, 10 - 16. https://doi.org/10.1016/j.jnucmat.2004.09.044
Krieger, K. ; Likonen, Jari ; Mayer, M. ; Pugno, R. ; Rohde, V. ; Vainonen-Ahlgren, Elizaveta. / Tungsten redistribution patterns in ASDEX Upgrade. In: Journal of Nuclear Materials. 2005 ; Vol. 337 - 339. pp. 10 - 16.
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Krieger, K, Likonen, J, Mayer, M, Pugno, R, Rohde, V & Vainonen-Ahlgren, E 2005, 'Tungsten redistribution patterns in ASDEX Upgrade', Journal of Nuclear Materials, vol. 337 - 339, pp. 10 - 16. https://doi.org/10.1016/j.jnucmat.2004.09.044

Tungsten redistribution patterns in ASDEX Upgrade. / Krieger, K. (Corresponding Author); Likonen, Jari; Mayer, M.; Pugno, R.; Rohde, V.; Vainonen-Ahlgren, Elizaveta.

In: Journal of Nuclear Materials, Vol. 337 - 339, 2005, p. 10 - 16.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Tungsten redistribution patterns in ASDEX Upgrade

AU - Krieger, K.

AU - Likonen, Jari

AU - Mayer, M.

AU - Pugno, R.

AU - Rohde, V.

AU - Vainonen-Ahlgren, Elizaveta

PY - 2005

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N2 - In ASDEX Upgrade tungsten is used as a high-Z plasma facing material. Its erosion, migration and subsequent deposition have been studied by analysis of a set of customised marker tiles, which was installed in the divertor and at the central column for one experimental campaign. Erosion rates were determined at the central column, which was the main tungsten source in that campaign. Deposition rates were determined at the central column and in the divertor region. The W-deposition in the divertor is strongly correlated to the local strike point exposure time. In contrast to low-Z wall materials, where deposition occurs mainly in the inner divertor, tungsten is found in similar quantities also in the outer divertor. The total amount of tungsten deposited outside the central column is about 40% of the gross W-source at the central column. One possible explanation for the 60% undetected tungsten might be the prompt local redeposition of eroded W atoms.

AB - In ASDEX Upgrade tungsten is used as a high-Z plasma facing material. Its erosion, migration and subsequent deposition have been studied by analysis of a set of customised marker tiles, which was installed in the divertor and at the central column for one experimental campaign. Erosion rates were determined at the central column, which was the main tungsten source in that campaign. Deposition rates were determined at the central column and in the divertor region. The W-deposition in the divertor is strongly correlated to the local strike point exposure time. In contrast to low-Z wall materials, where deposition occurs mainly in the inner divertor, tungsten is found in similar quantities also in the outer divertor. The total amount of tungsten deposited outside the central column is about 40% of the gross W-source at the central column. One possible explanation for the 60% undetected tungsten might be the prompt local redeposition of eroded W atoms.

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KW - first wall

KW - impurity transport

KW - tungsten

KW - ITER

KW - JET

KW - fusion energy

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