Investigation of local carbon transport in the ASDEX Upgrade divertor using 13CH4 puffing

R. Pugno (Corresponding Author), K. Krieger, Markus Airila, Leena Aho-Mantila, A. Kreter, S. Brezinsek, V. Rohde, D. Coster, A. Chankin, M. Wischmeier, ASDEX Upgrade Team

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

Abstract

To investigate the combined effect of re-deposition, re-erosion and local transport, known quantities of 13CH4 were puffed at the end of the 2007 experimental campaign in the ASDEX Upgrade outboard divertor. Exposed tiles were carefully removed for analysis. The amount of 13C locally deposited was measured by nuclear reaction analysis (NRA) and colorimetry. About 100% of injected carbon is deposited within a ± 15 cm extension in the toroidal direction. In contrast to H-mode results where re-deposition was exclusively downstream, in L-mode, more than one third of the injected hydrocarbon is found upstream. Colorimetric analysis of images taken with different lighting angles to the surface reveals a strong asymmetry in the carbon deposition pattern with respect to the injection facing/averting side of the surface roughness, with 4× thicker layers on the side facing the puffing location. The deposition pattern deviates clearly from the magnetic trajectories showing the effect of downward and radial drifts. ERO modelling of a similar experiment carried out in 2003 in H-mode background plasma can nicely reproduce the toroidal deposition pattern but drifts are not yet satisfactory described.
Original languageEnglish
Pages (from-to)68-71
Number of pages4
JournalJournal of Nuclear Materials
Volume390-391
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed
Event18th International Conference on Plasma-Surface Interactions in Controlled Fusion Device, 26-30 May 2008, Toledo, Spain -
Duration: 1 Jan 2009 → …

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Carbon
carbon
Colorimetric analysis
colorimetry
Colorimetry
Facings
Nuclear reactions
tiles
Tile
Hydrocarbons
nuclear reactions
illuminating
upstream
erosion
Erosion
surface roughness
hydrocarbons
Lighting
Surface roughness
Trajectories

Cite this

Pugno, R. ; Krieger, K. ; Airila, Markus ; Aho-Mantila, Leena ; Kreter, A. ; Brezinsek, S. ; Rohde, V. ; Coster, D. ; Chankin, A. ; Wischmeier, M. ; Team, ASDEX Upgrade. / Investigation of local carbon transport in the ASDEX Upgrade divertor using 13CH4 puffing. In: Journal of Nuclear Materials. 2009 ; Vol. 390-391. pp. 68-71.
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title = "Investigation of local carbon transport in the ASDEX Upgrade divertor using 13CH4 puffing",
abstract = "To investigate the combined effect of re-deposition, re-erosion and local transport, known quantities of 13CH4 were puffed at the end of the 2007 experimental campaign in the ASDEX Upgrade outboard divertor. Exposed tiles were carefully removed for analysis. The amount of 13C locally deposited was measured by nuclear reaction analysis (NRA) and colorimetry. About 100{\%} of injected carbon is deposited within a ± 15 cm extension in the toroidal direction. In contrast to H-mode results where re-deposition was exclusively downstream, in L-mode, more than one third of the injected hydrocarbon is found upstream. Colorimetric analysis of images taken with different lighting angles to the surface reveals a strong asymmetry in the carbon deposition pattern with respect to the injection facing/averting side of the surface roughness, with 4× thicker layers on the side facing the puffing location. The deposition pattern deviates clearly from the magnetic trajectories showing the effect of downward and radial drifts. ERO modelling of a similar experiment carried out in 2003 in H-mode background plasma can nicely reproduce the toroidal deposition pattern but drifts are not yet satisfactory described.",
author = "R. Pugno and K. Krieger and Markus Airila and Leena Aho-Mantila and A. Kreter and S. Brezinsek and V. Rohde and D. Coster and A. Chankin and M. Wischmeier and Team, {ASDEX Upgrade}",
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Pugno, R, Krieger, K, Airila, M, Aho-Mantila, L, Kreter, A, Brezinsek, S, Rohde, V, Coster, D, Chankin, A, Wischmeier, M & Team, ASDEXU 2009, 'Investigation of local carbon transport in the ASDEX Upgrade divertor using 13CH4 puffing', Journal of Nuclear Materials, vol. 390-391, pp. 68-71. https://doi.org/10.1016/j.jnucmat.2009.01.065

Investigation of local carbon transport in the ASDEX Upgrade divertor using 13CH4 puffing. / Pugno, R. (Corresponding Author); Krieger, K.; Airila, Markus; Aho-Mantila, Leena; Kreter, A.; Brezinsek, S.; Rohde, V.; Coster, D.; Chankin, A.; Wischmeier, M.; Team, ASDEX Upgrade.

In: Journal of Nuclear Materials, Vol. 390-391, 2009, p. 68-71.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Investigation of local carbon transport in the ASDEX Upgrade divertor using 13CH4 puffing

AU - Pugno, R.

AU - Krieger, K.

AU - Airila, Markus

AU - Aho-Mantila, Leena

AU - Kreter, A.

AU - Brezinsek, S.

AU - Rohde, V.

AU - Coster, D.

AU - Chankin, A.

AU - Wischmeier, M.

AU - Team, ASDEX Upgrade

PY - 2009

Y1 - 2009

N2 - To investigate the combined effect of re-deposition, re-erosion and local transport, known quantities of 13CH4 were puffed at the end of the 2007 experimental campaign in the ASDEX Upgrade outboard divertor. Exposed tiles were carefully removed for analysis. The amount of 13C locally deposited was measured by nuclear reaction analysis (NRA) and colorimetry. About 100% of injected carbon is deposited within a ± 15 cm extension in the toroidal direction. In contrast to H-mode results where re-deposition was exclusively downstream, in L-mode, more than one third of the injected hydrocarbon is found upstream. Colorimetric analysis of images taken with different lighting angles to the surface reveals a strong asymmetry in the carbon deposition pattern with respect to the injection facing/averting side of the surface roughness, with 4× thicker layers on the side facing the puffing location. The deposition pattern deviates clearly from the magnetic trajectories showing the effect of downward and radial drifts. ERO modelling of a similar experiment carried out in 2003 in H-mode background plasma can nicely reproduce the toroidal deposition pattern but drifts are not yet satisfactory described.

AB - To investigate the combined effect of re-deposition, re-erosion and local transport, known quantities of 13CH4 were puffed at the end of the 2007 experimental campaign in the ASDEX Upgrade outboard divertor. Exposed tiles were carefully removed for analysis. The amount of 13C locally deposited was measured by nuclear reaction analysis (NRA) and colorimetry. About 100% of injected carbon is deposited within a ± 15 cm extension in the toroidal direction. In contrast to H-mode results where re-deposition was exclusively downstream, in L-mode, more than one third of the injected hydrocarbon is found upstream. Colorimetric analysis of images taken with different lighting angles to the surface reveals a strong asymmetry in the carbon deposition pattern with respect to the injection facing/averting side of the surface roughness, with 4× thicker layers on the side facing the puffing location. The deposition pattern deviates clearly from the magnetic trajectories showing the effect of downward and radial drifts. ERO modelling of a similar experiment carried out in 2003 in H-mode background plasma can nicely reproduce the toroidal deposition pattern but drifts are not yet satisfactory described.

U2 - 10.1016/j.jnucmat.2009.01.065

DO - 10.1016/j.jnucmat.2009.01.065

M3 - Article

VL - 390-391

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EP - 71

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

ER -