Induced carbon deposition by local hydrocarbon injection into detached divertor plasmas in JET

Markus Airila (Corresponding Author), J.P. Coad, JET-EFDA collaborators, S. Brezinsek, P. Belo, M. Groth, A. Kirschner, T. Makkonen, M.F. Stamp, J.D. Strachan, A.M. Widdowson, S. Wiesen

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

During detachment experiments of JET in 2007 (Brezinsek et al., 2009 [1]), 1 × 1022 molecules of 12CD4 were injected at a rate of about 5 × 1020 s−1 into L-mode plasma. The injection was done at the outer strike point in the centre of the horizontal target, just before opening the machine. The deposited layers were analyzed for deuterium post mortem after the removal of tiles. The heaviest local D deposition density is found immediately upstream of the gas inlet, but downstream the deposition is found over a larger area. In total, 3.7 × 1020 deuterium atoms were found locally deposited; if the mean D/C in the deposits is 0.4, then about 10% of the injected carbon was locally deposited. Transport and local deposition of the injected carbon was modeled with the 3D Monte Carlo impurity transport code ERO (Kirschner et al., 2000 [2]). The plasma background was generated with the onion-skin solver of the DIVIMP code (Stangeby and Elder, 1992 [3]). Locally deposited fraction is reproduced with ERO but the distribution not satisfactorily. In particular the poloidal transport of carbon is several times weaker than measured.
Original languageEnglish
Pages (from-to)S235-S238
Number of pages4
JournalJournal of Nuclear Materials
Volume415
Issue number1
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed
Event19th International Conference on Plasma Surface Interactions in Controlled Fusion Devices, PSI-19 - San Diego, United States
Duration: 24 May 201028 May 2010

Fingerprint

Hydrocarbons
Carbon
hydrocarbons
Deuterium
injection
Plasmas
deuterium
carbon
tiles
Tile
detachment
upstream
Skin
Deposits
Gases
deposits
Impurities
impurities
Atoms
Molecules

Keywords

  • plasma physics
  • Monte Carlo code
  • divertors

Cite this

Airila, M., Coad, J. P., JET-EFDA collaborators, Brezinsek, S., Belo, P., Groth, M., ... Wiesen, S. (2011). Induced carbon deposition by local hydrocarbon injection into detached divertor plasmas in JET. Journal of Nuclear Materials, 415(1), S235-S238. https://doi.org/10.1016/j.jnucmat.2010.11.054
Airila, Markus ; Coad, J.P. ; JET-EFDA collaborators ; Brezinsek, S. ; Belo, P. ; Groth, M. ; Kirschner, A. ; Makkonen, T. ; Stamp, M.F. ; Strachan, J.D. ; Widdowson, A.M. ; Wiesen, S. / Induced carbon deposition by local hydrocarbon injection into detached divertor plasmas in JET. In: Journal of Nuclear Materials. 2011 ; Vol. 415, No. 1. pp. S235-S238.
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title = "Induced carbon deposition by local hydrocarbon injection into detached divertor plasmas in JET",
abstract = "During detachment experiments of JET in 2007 (Brezinsek et al., 2009 [1]), 1 × 1022 molecules of 12CD4 were injected at a rate of about 5 × 1020 s−1 into L-mode plasma. The injection was done at the outer strike point in the centre of the horizontal target, just before opening the machine. The deposited layers were analyzed for deuterium post mortem after the removal of tiles. The heaviest local D deposition density is found immediately upstream of the gas inlet, but downstream the deposition is found over a larger area. In total, 3.7 × 1020 deuterium atoms were found locally deposited; if the mean D/C in the deposits is 0.4, then about 10{\%} of the injected carbon was locally deposited. Transport and local deposition of the injected carbon was modeled with the 3D Monte Carlo impurity transport code ERO (Kirschner et al., 2000 [2]). The plasma background was generated with the onion-skin solver of the DIVIMP code (Stangeby and Elder, 1992 [3]). Locally deposited fraction is reproduced with ERO but the distribution not satisfactorily. In particular the poloidal transport of carbon is several times weaker than measured.",
keywords = "plasma physics, Monte Carlo code, divertors",
author = "Markus Airila and J.P. Coad and {JET-EFDA collaborators} and S. Brezinsek and P. Belo and M. Groth and A. Kirschner and T. Makkonen and M.F. Stamp and J.D. Strachan and A.M. Widdowson and S. Wiesen",
year = "2011",
doi = "10.1016/j.jnucmat.2010.11.054",
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Airila, M, Coad, JP, JET-EFDA collaborators, Brezinsek, S, Belo, P, Groth, M, Kirschner, A, Makkonen, T, Stamp, MF, Strachan, JD, Widdowson, AM & Wiesen, S 2011, 'Induced carbon deposition by local hydrocarbon injection into detached divertor plasmas in JET', Journal of Nuclear Materials, vol. 415, no. 1, pp. S235-S238. https://doi.org/10.1016/j.jnucmat.2010.11.054

Induced carbon deposition by local hydrocarbon injection into detached divertor plasmas in JET. / Airila, Markus (Corresponding Author); Coad, J.P.; JET-EFDA collaborators; Brezinsek, S.; Belo, P.; Groth, M.; Kirschner, A.; Makkonen, T.; Stamp, M.F.; Strachan, J.D.; Widdowson, A.M.; Wiesen, S.

In: Journal of Nuclear Materials, Vol. 415, No. 1, 2011, p. S235-S238.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Induced carbon deposition by local hydrocarbon injection into detached divertor plasmas in JET

AU - Airila, Markus

AU - Coad, J.P.

AU - JET-EFDA collaborators

AU - Brezinsek, S.

AU - Belo, P.

AU - Groth, M.

AU - Kirschner, A.

AU - Makkonen, T.

AU - Stamp, M.F.

AU - Strachan, J.D.

AU - Widdowson, A.M.

AU - Wiesen, S.

PY - 2011

Y1 - 2011

N2 - During detachment experiments of JET in 2007 (Brezinsek et al., 2009 [1]), 1 × 1022 molecules of 12CD4 were injected at a rate of about 5 × 1020 s−1 into L-mode plasma. The injection was done at the outer strike point in the centre of the horizontal target, just before opening the machine. The deposited layers were analyzed for deuterium post mortem after the removal of tiles. The heaviest local D deposition density is found immediately upstream of the gas inlet, but downstream the deposition is found over a larger area. In total, 3.7 × 1020 deuterium atoms were found locally deposited; if the mean D/C in the deposits is 0.4, then about 10% of the injected carbon was locally deposited. Transport and local deposition of the injected carbon was modeled with the 3D Monte Carlo impurity transport code ERO (Kirschner et al., 2000 [2]). The plasma background was generated with the onion-skin solver of the DIVIMP code (Stangeby and Elder, 1992 [3]). Locally deposited fraction is reproduced with ERO but the distribution not satisfactorily. In particular the poloidal transport of carbon is several times weaker than measured.

AB - During detachment experiments of JET in 2007 (Brezinsek et al., 2009 [1]), 1 × 1022 molecules of 12CD4 were injected at a rate of about 5 × 1020 s−1 into L-mode plasma. The injection was done at the outer strike point in the centre of the horizontal target, just before opening the machine. The deposited layers were analyzed for deuterium post mortem after the removal of tiles. The heaviest local D deposition density is found immediately upstream of the gas inlet, but downstream the deposition is found over a larger area. In total, 3.7 × 1020 deuterium atoms were found locally deposited; if the mean D/C in the deposits is 0.4, then about 10% of the injected carbon was locally deposited. Transport and local deposition of the injected carbon was modeled with the 3D Monte Carlo impurity transport code ERO (Kirschner et al., 2000 [2]). The plasma background was generated with the onion-skin solver of the DIVIMP code (Stangeby and Elder, 1992 [3]). Locally deposited fraction is reproduced with ERO but the distribution not satisfactorily. In particular the poloidal transport of carbon is several times weaker than measured.

KW - plasma physics

KW - Monte Carlo code

KW - divertors

U2 - 10.1016/j.jnucmat.2010.11.054

DO - 10.1016/j.jnucmat.2010.11.054

M3 - Article

VL - 415

SP - S235-S238

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

IS - 1

ER -