ERO modelling of local deposition of injected 13C tracer at the outer divertor of JET

Markus, I. Airila, L.K. Aho-Mantila, S. Brezinsek, J.P. Coad, A. Kirschner, Jari Likonen, D. Matveev, M. Rubel, J.D. Strachan, A. Widdowson, S. Wiesen, JET EFDA Contributors

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Abstract

The 2004 tracer experiment of JET with the injection of 13CH4 into H-mode plasma at the outer divertor has been modelled with the Monte Carlo impurity transport code ERO. EDGE2D solutions for inter-ELM and ELM-peak phases were used as plasma backgrounds. Local two-dimensional (2D) deposition patterns at the vertical outer divertor target plate were obtained for comparison with post-mortem surface analyses. ERO also provides emission profiles for comparison with radially resolved spectroscopic measurements. Modelling indicates that enhanced re-erosion of deposited carbon layers is essential in explaining the amount of local deposition. Assuming negligible effective sticking of hydrocarbons, the measured local deposition of 20–34% is reproduced if re-erosion of deposits is enhanced by a factor of 2.5–7 compared to graphite erosion. If deposits are treated like the substrate, the modelled deposition is 55%. Deposition measurements at the shadowed area around injectors can be well explained by assuming negligible re-erosion but similar sticking behaviour there as on plasma-wetted surfaces.
Original languageEnglish
Article number014021
JournalPhysica Scripta
Issue numberT138
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

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tracers
Erosion
erosion
Modeling
Plasma
deposits
Injector
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Hydrocarbons
Impurities
injectors
Injection
Carbon
graphite
hydrocarbons
Vertical
Substrate
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impurities
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Cite this

Airila, Markus, I. ; Aho-Mantila, L.K. ; Brezinsek, S. ; Coad, J.P. ; Kirschner, A. ; Likonen, Jari ; Matveev, D. ; Rubel, M. ; Strachan, J.D. ; Widdowson, A. ; Wiesen, S. ; Contributors, JET EFDA. / ERO modelling of local deposition of injected 13C tracer at the outer divertor of JET. In: Physica Scripta. 2009 ; No. T138.
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title = "ERO modelling of local deposition of injected 13C tracer at the outer divertor of JET",
abstract = "The 2004 tracer experiment of JET with the injection of 13CH4 into H-mode plasma at the outer divertor has been modelled with the Monte Carlo impurity transport code ERO. EDGE2D solutions for inter-ELM and ELM-peak phases were used as plasma backgrounds. Local two-dimensional (2D) deposition patterns at the vertical outer divertor target plate were obtained for comparison with post-mortem surface analyses. ERO also provides emission profiles for comparison with radially resolved spectroscopic measurements. Modelling indicates that enhanced re-erosion of deposited carbon layers is essential in explaining the amount of local deposition. Assuming negligible effective sticking of hydrocarbons, the measured local deposition of 20–34{\%} is reproduced if re-erosion of deposits is enhanced by a factor of 2.5–7 compared to graphite erosion. If deposits are treated like the substrate, the modelled deposition is 55{\%}. Deposition measurements at the shadowed area around injectors can be well explained by assuming negligible re-erosion but similar sticking behaviour there as on plasma-wetted surfaces.",
author = "Airila, {Markus, I.} and L.K. Aho-Mantila and S. Brezinsek and J.P. Coad and A. Kirschner and Jari Likonen and D. Matveev and M. Rubel and J.D. Strachan and A. Widdowson and S. Wiesen and Contributors, {JET EFDA}",
year = "2009",
doi = "10.1088/0031-8949/2009/T138/014021",
language = "English",
journal = "Physica Scripta",
issn = "0031-8949",
publisher = "Institute of Physics IOP",
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Airila, MI, Aho-Mantila, LK, Brezinsek, S, Coad, JP, Kirschner, A, Likonen, J, Matveev, D, Rubel, M, Strachan, JD, Widdowson, A, Wiesen, S & Contributors, JETEFDA 2009, 'ERO modelling of local deposition of injected 13C tracer at the outer divertor of JET', Physica Scripta, no. T138, 014021. https://doi.org/10.1088/0031-8949/2009/T138/014021

ERO modelling of local deposition of injected 13C tracer at the outer divertor of JET. / Airila, Markus, I.; Aho-Mantila, L.K.; Brezinsek, S.; Coad, J.P.; Kirschner, A.; Likonen, Jari; Matveev, D.; Rubel, M.; Strachan, J.D.; Widdowson, A.; Wiesen, S.; Contributors, JET EFDA.

In: Physica Scripta, No. T138, 014021, 2009.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - ERO modelling of local deposition of injected 13C tracer at the outer divertor of JET

AU - Airila, Markus, I.

AU - Aho-Mantila, L.K.

AU - Brezinsek, S.

AU - Coad, J.P.

AU - Kirschner, A.

AU - Likonen, Jari

AU - Matveev, D.

AU - Rubel, M.

AU - Strachan, J.D.

AU - Widdowson, A.

AU - Wiesen, S.

AU - Contributors, JET EFDA

PY - 2009

Y1 - 2009

N2 - The 2004 tracer experiment of JET with the injection of 13CH4 into H-mode plasma at the outer divertor has been modelled with the Monte Carlo impurity transport code ERO. EDGE2D solutions for inter-ELM and ELM-peak phases were used as plasma backgrounds. Local two-dimensional (2D) deposition patterns at the vertical outer divertor target plate were obtained for comparison with post-mortem surface analyses. ERO also provides emission profiles for comparison with radially resolved spectroscopic measurements. Modelling indicates that enhanced re-erosion of deposited carbon layers is essential in explaining the amount of local deposition. Assuming negligible effective sticking of hydrocarbons, the measured local deposition of 20–34% is reproduced if re-erosion of deposits is enhanced by a factor of 2.5–7 compared to graphite erosion. If deposits are treated like the substrate, the modelled deposition is 55%. Deposition measurements at the shadowed area around injectors can be well explained by assuming negligible re-erosion but similar sticking behaviour there as on plasma-wetted surfaces.

AB - The 2004 tracer experiment of JET with the injection of 13CH4 into H-mode plasma at the outer divertor has been modelled with the Monte Carlo impurity transport code ERO. EDGE2D solutions for inter-ELM and ELM-peak phases were used as plasma backgrounds. Local two-dimensional (2D) deposition patterns at the vertical outer divertor target plate were obtained for comparison with post-mortem surface analyses. ERO also provides emission profiles for comparison with radially resolved spectroscopic measurements. Modelling indicates that enhanced re-erosion of deposited carbon layers is essential in explaining the amount of local deposition. Assuming negligible effective sticking of hydrocarbons, the measured local deposition of 20–34% is reproduced if re-erosion of deposits is enhanced by a factor of 2.5–7 compared to graphite erosion. If deposits are treated like the substrate, the modelled deposition is 55%. Deposition measurements at the shadowed area around injectors can be well explained by assuming negligible re-erosion but similar sticking behaviour there as on plasma-wetted surfaces.

U2 - 10.1088/0031-8949/2009/T138/014021

DO - 10.1088/0031-8949/2009/T138/014021

M3 - Article

JO - Physica Scripta

JF - Physica Scripta

SN - 0031-8949

IS - T138

M1 - 014021

ER -