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 language | English |
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Pages (from-to) | S227-S230 |
Journal | Journal of Nuclear Materials |
Volume | 415 |
Issue number | 1, Supplement |
DOIs | |
Publication status | Published - 2011 |
MoE publication type | A1 Journal article-refereed |