Global transport of light elements boron and carbon in the full-W ASDEX Upgrade

Antti Hakola (Corresponding Author), Jari Likonen, Seppo Koivuranta, K. Krieger, M. Mayer, R. Neu, V. Rohde, K. Sugiyama

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

Transport of carbon and boron has been investigated in the full-W ASDEX Upgrade after experimental campaigns with (2008) and without (2007) boronizations. For this purpose, poloidal deposition profiles of the two elements on tungsten and graphite regions of lower-divertor tiles have been determined. Carbon is mainly deposited in the inner divertor - 80-90% of the determined 12C and 13C inventories on W - while boron shows a much more symmetric deposition profile. In the unboronized machine, the boron inventories are a factor of 10 smaller than in the boronized case and result from residual boron atoms left in the torus prior to the 2007 campaign. Both carbon and boron are deposited more efficiently and/or show less erosion on graphite than on tungsten, particularly in the outer divertor. For 13C, the difference is 10-100 in favor of graphite. This is most probably caused by a higher re-erosion from tungsten surfaces.
Original languageEnglish
Pages (from-to)S227-S230
JournalJournal of Nuclear Materials
Volume415
Issue number1, Suppl.
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

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Hakola, Antti ; Likonen, Jari ; Koivuranta, Seppo ; Krieger, K. ; Mayer, M. ; Neu, R. ; Rohde, V. ; Sugiyama, K. / Global transport of light elements boron and carbon in the full-W ASDEX Upgrade. In: Journal of Nuclear Materials. 2011 ; Vol. 415, No. 1, Suppl. pp. S227-S230.
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abstract = "Transport of carbon and boron has been investigated in the full-W ASDEX Upgrade after experimental campaigns with (2008) and without (2007) boronizations. For this purpose, poloidal deposition profiles of the two elements on tungsten and graphite regions of lower-divertor tiles have been determined. Carbon is mainly deposited in the inner divertor - 80-90{\%} of the determined 12C and 13C inventories on W - while boron shows a much more symmetric deposition profile. In the unboronized machine, the boron inventories are a factor of 10 smaller than in the boronized case and result from residual boron atoms left in the torus prior to the 2007 campaign. Both carbon and boron are deposited more efficiently and/or show less erosion on graphite than on tungsten, particularly in the outer divertor. For 13C, the difference is 10-100 in favor of graphite. This is most probably caused by a higher re-erosion from tungsten surfaces.",
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Global transport of light elements boron and carbon in the full-W ASDEX Upgrade. / Hakola, Antti (Corresponding Author); Likonen, Jari; Koivuranta, Seppo; Krieger, K.; Mayer, M.; Neu, R.; Rohde, V.; Sugiyama, K.

In: Journal of Nuclear Materials, Vol. 415, No. 1, Suppl., 2011, p. S227-S230.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Hakola, Antti

AU - Likonen, Jari

AU - Koivuranta, Seppo

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AU - Mayer, M.

AU - Neu, R.

AU - Rohde, V.

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AB - Transport of carbon and boron has been investigated in the full-W ASDEX Upgrade after experimental campaigns with (2008) and without (2007) boronizations. For this purpose, poloidal deposition profiles of the two elements on tungsten and graphite regions of lower-divertor tiles have been determined. Carbon is mainly deposited in the inner divertor - 80-90% of the determined 12C and 13C inventories on W - while boron shows a much more symmetric deposition profile. In the unboronized machine, the boron inventories are a factor of 10 smaller than in the boronized case and result from residual boron atoms left in the torus prior to the 2007 campaign. Both carbon and boron are deposited more efficiently and/or show less erosion on graphite than on tungsten, particularly in the outer divertor. For 13C, the difference is 10-100 in favor of graphite. This is most probably caused by a higher re-erosion from tungsten surfaces.

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