Carbon chemical erosion in H-mode discharges in ASDEX Upgrade divertor IIb: Flux dependence and local redeposition

R. Pugno (Corresponding Author), K. Krieger, A. Kirschner, A. Kallenbach, D.P. Coster, R. Dux, U. Fantz, Jari Likonen, H.W. Müller, J. Neuhauser, V. Rohde, Elizaveta Vainonen-Ahlgren, ASDEX Upgrade Team

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)

Abstract

Carbon erosion at the outboard divertor in ASDEX Upgrade has been investigated using the emission spectroscopy technique. The methane molecular influx was calibrated by simultaneous CD4 puffing. In deuterium H-mode discharges a decrease of D/XBCD←CD4 with increasing ion flux (decreasing temperature) is found at fluxes in the range 0.5–2 × 1022 m−2 s−1 and no dependence for higher fluxes. The corresponding obtained yields show a negative power law flux dependence with exponent γ = −0.46. To investigate the combined effect of re-deposition, re-erosion and local transport, known quantities of 13CH4 were puffed at the end of the 2002/2003 experimental campaign. The amount of 13C locally redeposited has been measured by nuclear reaction analysis (NRA). The results show a strongly localised re-deposition near the puff location, with a downstream tail and a moderate downward drift with respect to the magnetic field line direction.
Original languageEnglish
Pages (from-to)985 - 989
Number of pages5
JournalJournal of Nuclear Materials
Volume337-339
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

Fingerprint

erosion
Erosion
Carbon
Fluxes
carbon
Nuclear reactions
Deuterium
Methane
Emission spectroscopy
nuclear reactions
deuterium
methane
exponents
Ions
Magnetic fields
Hydrogen
magnetic fields
spectroscopy
ions
Temperature

Keywords

  • ASDEX upgrade
  • chemical erosion
  • erosion
  • deposition
  • spectroscopy
  • surface analysis
  • ITER
  • JET
  • fusion energy

Cite this

Pugno, R., Krieger, K., Kirschner, A., Kallenbach, A., Coster, D. P., Dux, R., ... ASDEX Upgrade Team (2005). Carbon chemical erosion in H-mode discharges in ASDEX Upgrade divertor IIb: Flux dependence and local redeposition. Journal of Nuclear Materials, 337-339, 985 - 989. https://doi.org/10.1016/j.jnucmat.2004.09.053
Pugno, R. ; Krieger, K. ; Kirschner, A. ; Kallenbach, A. ; Coster, D.P. ; Dux, R. ; Fantz, U. ; Likonen, Jari ; Müller, H.W. ; Neuhauser, J. ; Rohde, V. ; Vainonen-Ahlgren, Elizaveta ; ASDEX Upgrade Team. / Carbon chemical erosion in H-mode discharges in ASDEX Upgrade divertor IIb : Flux dependence and local redeposition. In: Journal of Nuclear Materials. 2005 ; Vol. 337-339. pp. 985 - 989.
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title = "Carbon chemical erosion in H-mode discharges in ASDEX Upgrade divertor IIb: Flux dependence and local redeposition",
abstract = "Carbon erosion at the outboard divertor in ASDEX Upgrade has been investigated using the emission spectroscopy technique. The methane molecular influx was calibrated by simultaneous CD4 puffing. In deuterium H-mode discharges a decrease of D/XBCD←CD4 with increasing ion flux (decreasing temperature) is found at fluxes in the range 0.5–2 × 1022 m−2 s−1 and no dependence for higher fluxes. The corresponding obtained yields show a negative power law flux dependence with exponent γ = −0.46. To investigate the combined effect of re-deposition, re-erosion and local transport, known quantities of 13CH4 were puffed at the end of the 2002/2003 experimental campaign. The amount of 13C locally redeposited has been measured by nuclear reaction analysis (NRA). The results show a strongly localised re-deposition near the puff location, with a downstream tail and a moderate downward drift with respect to the magnetic field line direction.",
keywords = "ASDEX upgrade, chemical erosion, erosion, deposition, spectroscopy, surface analysis, ITER, JET, fusion energy",
author = "R. Pugno and K. Krieger and A. Kirschner and A. Kallenbach and D.P. Coster and R. Dux and U. Fantz and Jari Likonen and H.W. M{\"u}ller and J. Neuhauser and V. Rohde and Elizaveta Vainonen-Ahlgren and {ASDEX Upgrade Team}",
year = "2005",
doi = "10.1016/j.jnucmat.2004.09.053",
language = "English",
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Pugno, R, Krieger, K, Kirschner, A, Kallenbach, A, Coster, DP, Dux, R, Fantz, U, Likonen, J, Müller, HW, Neuhauser, J, Rohde, V, Vainonen-Ahlgren, E & ASDEX Upgrade Team 2005, 'Carbon chemical erosion in H-mode discharges in ASDEX Upgrade divertor IIb: Flux dependence and local redeposition', Journal of Nuclear Materials, vol. 337-339, pp. 985 - 989. https://doi.org/10.1016/j.jnucmat.2004.09.053

Carbon chemical erosion in H-mode discharges in ASDEX Upgrade divertor IIb : Flux dependence and local redeposition. / Pugno, R. (Corresponding Author); Krieger, K.; Kirschner, A.; Kallenbach, A.; Coster, D.P.; Dux, R.; Fantz, U.; Likonen, Jari; Müller, H.W.; Neuhauser, J.; Rohde, V.; Vainonen-Ahlgren, Elizaveta; ASDEX Upgrade Team.

In: Journal of Nuclear Materials, Vol. 337-339, 2005, p. 985 - 989.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Carbon chemical erosion in H-mode discharges in ASDEX Upgrade divertor IIb

T2 - Flux dependence and local redeposition

AU - Pugno, R.

AU - Krieger, K.

AU - Kirschner, A.

AU - Kallenbach, A.

AU - Coster, D.P.

AU - Dux, R.

AU - Fantz, U.

AU - Likonen, Jari

AU - Müller, H.W.

AU - Neuhauser, J.

AU - Rohde, V.

AU - Vainonen-Ahlgren, Elizaveta

AU - ASDEX Upgrade Team, null

PY - 2005

Y1 - 2005

N2 - Carbon erosion at the outboard divertor in ASDEX Upgrade has been investigated using the emission spectroscopy technique. The methane molecular influx was calibrated by simultaneous CD4 puffing. In deuterium H-mode discharges a decrease of D/XBCD←CD4 with increasing ion flux (decreasing temperature) is found at fluxes in the range 0.5–2 × 1022 m−2 s−1 and no dependence for higher fluxes. The corresponding obtained yields show a negative power law flux dependence with exponent γ = −0.46. To investigate the combined effect of re-deposition, re-erosion and local transport, known quantities of 13CH4 were puffed at the end of the 2002/2003 experimental campaign. The amount of 13C locally redeposited has been measured by nuclear reaction analysis (NRA). The results show a strongly localised re-deposition near the puff location, with a downstream tail and a moderate downward drift with respect to the magnetic field line direction.

AB - Carbon erosion at the outboard divertor in ASDEX Upgrade has been investigated using the emission spectroscopy technique. The methane molecular influx was calibrated by simultaneous CD4 puffing. In deuterium H-mode discharges a decrease of D/XBCD←CD4 with increasing ion flux (decreasing temperature) is found at fluxes in the range 0.5–2 × 1022 m−2 s−1 and no dependence for higher fluxes. The corresponding obtained yields show a negative power law flux dependence with exponent γ = −0.46. To investigate the combined effect of re-deposition, re-erosion and local transport, known quantities of 13CH4 were puffed at the end of the 2002/2003 experimental campaign. The amount of 13C locally redeposited has been measured by nuclear reaction analysis (NRA). The results show a strongly localised re-deposition near the puff location, with a downstream tail and a moderate downward drift with respect to the magnetic field line direction.

KW - ASDEX upgrade

KW - chemical erosion

KW - erosion

KW - deposition

KW - spectroscopy

KW - surface analysis

KW - ITER

KW - JET

KW - fusion energy

U2 - 10.1016/j.jnucmat.2004.09.053

DO - 10.1016/j.jnucmat.2004.09.053

M3 - Article

VL - 337-339

SP - 985

EP - 989

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

ER -