TY - JOUR
T1 - Global transport of light elements boron and carbon in the full-W ASDEX Upgrade
AU - Hakola, A.
AU - Likonen, J.
AU - Koivuranta, S.
AU - Krieger, K.
AU - Mayer, M.
AU - Neu, R.
AU - Rohde, V.
AU - Sugiyama, K.
N1 - Funding Information:
This work, supported by the European Communities under the contract of Association between Euratom and Tekes, was carried out within the framework of the Task Force on Plasma Wall Interactions of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission. The technical support by M. Fußeder and J. Dorner is gratefully acknowledged.
PY - 2011/8/1
Y1 - 2011/8/1
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=80054833756&partnerID=8YFLogxK
U2 - 10.1016/j.jnucmat.2010.08.053
DO - 10.1016/j.jnucmat.2010.08.053
M3 - Article
AN - SCOPUS:80054833756
SN - 0022-3115
VL - 415
SP - S227-S230
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 1 SUPPL
ER -