Modelling of carbon migration during JET 13C injection experiments

J. D. Strachan, Jari Likonen, P. Coad, M. Rubel, A. Widdowson, M. Airila, P. Andrew, S. Brezinsek, G. Corrigan, H. G. Esser, S. Jachmich, A. Kallenbach, A. Kirschner, A. Kreter, G. F. Matthews, V. Philipps, R. A. Pitts, J. Spence, M. Stamp, S. WiesenJET-EFDA Contributors

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Abstract

JET has performed two dedicated carbon migration experiments on the final run day of separate campaigns (2001 and 2004) using 13CH4 methane injected into repeated discharges. The EDGE2D/NIMBUS code modelled the carbon migration in both experiments. This paper describes this modelling and identifies a number of important migration pathways: (1) deposition and erosion near the injection location, (2) migration through the main chamber SOL, (3) migration through the private flux region (PFR) aided by E × B drifts and (4) neutral migration originating near the strike points. In H-Mode, type I ELMs are calculated to influence the migration by enhancing erosion during the ELM peak and increasing the long-range migration immediately following the ELM. The erosion/re-deposition cycle along the outer target leads to a multistep migration of 13C towards the separatrix which is called 'walking'. This walking created carbon neutrals at the outer strike point and led to 13C deposition in the PFR. Although several migration pathways have been identified, quantitative analyses are hindered by experimental uncertainty in divertor leakage, and the lack of measurements at locations such as gaps and shadowed regions.
Original languageEnglish
Article number105002
JournalNuclear Fusion
Volume48
Issue number10
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

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Strachan, J. D., Likonen, J., Coad, P., Rubel, M., Widdowson, A., Airila, M., ... JET-EFDA Contributors (2008). Modelling of carbon migration during JET 13C injection experiments. Nuclear Fusion, 48(10), [105002]. https://doi.org/10.1088/0029-5515/48/10/105002
Strachan, J. D. ; Likonen, Jari ; Coad, P. ; Rubel, M. ; Widdowson, A. ; Airila, M. ; Andrew, P. ; Brezinsek, S. ; Corrigan, G. ; Esser, H. G. ; Jachmich, S. ; Kallenbach, A. ; Kirschner, A. ; Kreter, A. ; Matthews, G. F. ; Philipps, V. ; Pitts, R. A. ; Spence, J. ; Stamp, M. ; Wiesen, S. ; JET-EFDA Contributors. / Modelling of carbon migration during JET 13C injection experiments. In: Nuclear Fusion. 2008 ; Vol. 48, No. 10.
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title = "Modelling of carbon migration during JET 13C injection experiments",
abstract = "JET has performed two dedicated carbon migration experiments on the final run day of separate campaigns (2001 and 2004) using 13CH4 methane injected into repeated discharges. The EDGE2D/NIMBUS code modelled the carbon migration in both experiments. This paper describes this modelling and identifies a number of important migration pathways: (1) deposition and erosion near the injection location, (2) migration through the main chamber SOL, (3) migration through the private flux region (PFR) aided by E × B drifts and (4) neutral migration originating near the strike points. In H-Mode, type I ELMs are calculated to influence the migration by enhancing erosion during the ELM peak and increasing the long-range migration immediately following the ELM. The erosion/re-deposition cycle along the outer target leads to a multistep migration of 13C towards the separatrix which is called 'walking'. This walking created carbon neutrals at the outer strike point and led to 13C deposition in the PFR. Although several migration pathways have been identified, quantitative analyses are hindered by experimental uncertainty in divertor leakage, and the lack of measurements at locations such as gaps and shadowed regions.",
author = "Strachan, {J. D.} and Jari Likonen and P. Coad and M. Rubel and A. Widdowson and M. Airila and P. Andrew and S. Brezinsek and G. Corrigan and Esser, {H. G.} and S. Jachmich and A. Kallenbach and A. Kirschner and A. Kreter and Matthews, {G. F.} and V. Philipps and Pitts, {R. A.} and J. Spence and M. Stamp and S. Wiesen and {JET-EFDA Contributors}",
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Strachan, JD, Likonen, J, Coad, P, Rubel, M, Widdowson, A, Airila, M, Andrew, P, Brezinsek, S, Corrigan, G, Esser, HG, Jachmich, S, Kallenbach, A, Kirschner, A, Kreter, A, Matthews, GF, Philipps, V, Pitts, RA, Spence, J, Stamp, M, Wiesen, S & JET-EFDA Contributors 2008, 'Modelling of carbon migration during JET 13C injection experiments', Nuclear Fusion, vol. 48, no. 10, 105002. https://doi.org/10.1088/0029-5515/48/10/105002

Modelling of carbon migration during JET 13C injection experiments. / Strachan, J. D.; Likonen, Jari; Coad, P.; Rubel, M.; Widdowson, A.; Airila, M.; Andrew, P.; Brezinsek, S.; Corrigan, G.; Esser, H. G.; Jachmich, S.; Kallenbach, A.; Kirschner, A.; Kreter, A.; Matthews, G. F.; Philipps, V.; Pitts, R. A.; Spence, J.; Stamp, M.; Wiesen, S.; JET-EFDA Contributors.

In: Nuclear Fusion, Vol. 48, No. 10, 105002, 2008.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Modelling of carbon migration during JET 13C injection experiments

AU - Strachan, J. D.

AU - Likonen, Jari

AU - Coad, P.

AU - Rubel, M.

AU - Widdowson, A.

AU - Airila, M.

AU - Andrew, P.

AU - Brezinsek, S.

AU - Corrigan, G.

AU - Esser, H. G.

AU - Jachmich, S.

AU - Kallenbach, A.

AU - Kirschner, A.

AU - Kreter, A.

AU - Matthews, G. F.

AU - Philipps, V.

AU - Pitts, R. A.

AU - Spence, J.

AU - Stamp, M.

AU - Wiesen, S.

AU - JET-EFDA Contributors,

PY - 2008

Y1 - 2008

N2 - JET has performed two dedicated carbon migration experiments on the final run day of separate campaigns (2001 and 2004) using 13CH4 methane injected into repeated discharges. The EDGE2D/NIMBUS code modelled the carbon migration in both experiments. This paper describes this modelling and identifies a number of important migration pathways: (1) deposition and erosion near the injection location, (2) migration through the main chamber SOL, (3) migration through the private flux region (PFR) aided by E × B drifts and (4) neutral migration originating near the strike points. In H-Mode, type I ELMs are calculated to influence the migration by enhancing erosion during the ELM peak and increasing the long-range migration immediately following the ELM. The erosion/re-deposition cycle along the outer target leads to a multistep migration of 13C towards the separatrix which is called 'walking'. This walking created carbon neutrals at the outer strike point and led to 13C deposition in the PFR. Although several migration pathways have been identified, quantitative analyses are hindered by experimental uncertainty in divertor leakage, and the lack of measurements at locations such as gaps and shadowed regions.

AB - JET has performed two dedicated carbon migration experiments on the final run day of separate campaigns (2001 and 2004) using 13CH4 methane injected into repeated discharges. The EDGE2D/NIMBUS code modelled the carbon migration in both experiments. This paper describes this modelling and identifies a number of important migration pathways: (1) deposition and erosion near the injection location, (2) migration through the main chamber SOL, (3) migration through the private flux region (PFR) aided by E × B drifts and (4) neutral migration originating near the strike points. In H-Mode, type I ELMs are calculated to influence the migration by enhancing erosion during the ELM peak and increasing the long-range migration immediately following the ELM. The erosion/re-deposition cycle along the outer target leads to a multistep migration of 13C towards the separatrix which is called 'walking'. This walking created carbon neutrals at the outer strike point and led to 13C deposition in the PFR. Although several migration pathways have been identified, quantitative analyses are hindered by experimental uncertainty in divertor leakage, and the lack of measurements at locations such as gaps and shadowed regions.

U2 - 10.1088/0029-5515/48/10/105002

DO - 10.1088/0029-5515/48/10/105002

M3 - Article

VL - 48

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 10

M1 - 105002

ER -