Interpretation of radiative divertor studies with impurity seeding in type-I ELMy H-mode plasmas in JET-ILW using EDGE2D-EIRENE

A. E. Järvinen (Corresponding Author), M. Groth, M. Airila, P. Belo, M. Beurskens, S. Brezinsek, M. Clever, G. Corrigan, S. Devaux, P. Drewelow, T. Eich, C. Giroud, D. Harting, A. Huber, S. Jachmich, K. Lawson, B. Lipschultz, G. Maddison, C. Maggi, T. MakkonenC. Marchetto, S. Marsen, G. F. Matthews, A. G. Meigs, D. Moulton, M. F. Stamp, S. Wiesen, M. Wischmeier, JET-EFDA collaborators

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Abstract Nitrogen seeded JET-ILW H-mode plasmas have been investigated with EDGE2D-EIRENE. The simulations reproduce the experimentally observed factor of 10 reduction in the outer target power deposition when the normalized divertor radiation, Praddiv/PSOL, increases from the unseeded levels of 15% up to the 50% levels required for detachment. At these radiation levels, nitrogen is predicted dominate the total radiation with a contribution of 85%, consistent with previous measurements in JET-C. Due to the low radiative potential of nitrogen at the electron temperatures above 100 eV, more than 80% of the radiation is predicted to occur in the scrape-off layer, making nitrogen a suitable divertor radiator for typical JET divertor conditions with Te around 30 eV. The simulations reproduce the experimentally observed particle flux reduction at the low-field side target without the need for strong recombination. This is due to strong impurity radiation reducing the power levels entering the deuterium ionization front.

Original languageEnglish
Article number48544
Pages (from-to)135-142
Number of pages8
JournalJournal of Nuclear Materials
Volume463
DOIs
Publication statusPublished - 22 Jul 2015
MoE publication typeA1 Journal article-refereed

Fingerprint

inoculation
Impurities
Plasmas
Radiation
Nitrogen
impurities
radiation
nitrogen
Deuterium
Electron temperature
Radiators
radiators
flux (rate)
detachment
Ionization
deuterium
simulation
electron energy
Fluxes
ionization

Cite this

Järvinen, A. E. ; Groth, M. ; Airila, M. ; Belo, P. ; Beurskens, M. ; Brezinsek, S. ; Clever, M. ; Corrigan, G. ; Devaux, S. ; Drewelow, P. ; Eich, T. ; Giroud, C. ; Harting, D. ; Huber, A. ; Jachmich, S. ; Lawson, K. ; Lipschultz, B. ; Maddison, G. ; Maggi, C. ; Makkonen, T. ; Marchetto, C. ; Marsen, S. ; Matthews, G. F. ; Meigs, A. G. ; Moulton, D. ; Stamp, M. F. ; Wiesen, S. ; Wischmeier, M. ; JET-EFDA collaborators. / Interpretation of radiative divertor studies with impurity seeding in type-I ELMy H-mode plasmas in JET-ILW using EDGE2D-EIRENE. In: Journal of Nuclear Materials. 2015 ; Vol. 463. pp. 135-142.
@article{acff59fff0ed461fb8132a80bce5af2b,
title = "Interpretation of radiative divertor studies with impurity seeding in type-I ELMy H-mode plasmas in JET-ILW using EDGE2D-EIRENE",
abstract = "Abstract Nitrogen seeded JET-ILW H-mode plasmas have been investigated with EDGE2D-EIRENE. The simulations reproduce the experimentally observed factor of 10 reduction in the outer target power deposition when the normalized divertor radiation, Praddiv/PSOL, increases from the unseeded levels of 15{\%} up to the 50{\%} levels required for detachment. At these radiation levels, nitrogen is predicted dominate the total radiation with a contribution of 85{\%}, consistent with previous measurements in JET-C. Due to the low radiative potential of nitrogen at the electron temperatures above 100 eV, more than 80{\%} of the radiation is predicted to occur in the scrape-off layer, making nitrogen a suitable divertor radiator for typical JET divertor conditions with Te around 30 eV. The simulations reproduce the experimentally observed particle flux reduction at the low-field side target without the need for strong recombination. This is due to strong impurity radiation reducing the power levels entering the deuterium ionization front.",
author = "J{\"a}rvinen, {A. E.} and M. Groth and M. Airila and P. Belo and M. Beurskens and S. Brezinsek and M. Clever and G. Corrigan and S. Devaux and P. Drewelow and T. Eich and C. Giroud and D. Harting and A. Huber and S. Jachmich and K. Lawson and B. Lipschultz and G. Maddison and C. Maggi and T. Makkonen and C. Marchetto and S. Marsen and Matthews, {G. F.} and Meigs, {A. G.} and D. Moulton and Stamp, {M. F.} and S. Wiesen and M. Wischmeier and {JET-EFDA collaborators}",
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month = "7",
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Järvinen, AE, Groth, M, Airila, M, Belo, P, Beurskens, M, Brezinsek, S, Clever, M, Corrigan, G, Devaux, S, Drewelow, P, Eich, T, Giroud, C, Harting, D, Huber, A, Jachmich, S, Lawson, K, Lipschultz, B, Maddison, G, Maggi, C, Makkonen, T, Marchetto, C, Marsen, S, Matthews, GF, Meigs, AG, Moulton, D, Stamp, MF, Wiesen, S, Wischmeier, M & JET-EFDA collaborators 2015, 'Interpretation of radiative divertor studies with impurity seeding in type-I ELMy H-mode plasmas in JET-ILW using EDGE2D-EIRENE', Journal of Nuclear Materials, vol. 463, 48544, pp. 135-142. https://doi.org/10.1016/j.jnucmat.2014.10.047

Interpretation of radiative divertor studies with impurity seeding in type-I ELMy H-mode plasmas in JET-ILW using EDGE2D-EIRENE. / Järvinen, A. E. (Corresponding Author); Groth, M.; Airila, M.; Belo, P.; Beurskens, M.; Brezinsek, S.; Clever, M.; Corrigan, G.; Devaux, S.; Drewelow, P.; Eich, T.; Giroud, C.; Harting, D.; Huber, A.; Jachmich, S.; Lawson, K.; Lipschultz, B.; Maddison, G.; Maggi, C.; Makkonen, T.; Marchetto, C.; Marsen, S.; Matthews, G. F.; Meigs, A. G.; Moulton, D.; Stamp, M. F.; Wiesen, S.; Wischmeier, M.; JET-EFDA collaborators.

In: Journal of Nuclear Materials, Vol. 463, 48544, 22.07.2015, p. 135-142.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Interpretation of radiative divertor studies with impurity seeding in type-I ELMy H-mode plasmas in JET-ILW using EDGE2D-EIRENE

AU - Järvinen, A. E.

AU - Groth, M.

AU - Airila, M.

AU - Belo, P.

AU - Beurskens, M.

AU - Brezinsek, S.

AU - Clever, M.

AU - Corrigan, G.

AU - Devaux, S.

AU - Drewelow, P.

AU - Eich, T.

AU - Giroud, C.

AU - Harting, D.

AU - Huber, A.

AU - Jachmich, S.

AU - Lawson, K.

AU - Lipschultz, B.

AU - Maddison, G.

AU - Maggi, C.

AU - Makkonen, T.

AU - Marchetto, C.

AU - Marsen, S.

AU - Matthews, G. F.

AU - Meigs, A. G.

AU - Moulton, D.

AU - Stamp, M. F.

AU - Wiesen, S.

AU - Wischmeier, M.

AU - JET-EFDA collaborators

PY - 2015/7/22

Y1 - 2015/7/22

N2 - Abstract Nitrogen seeded JET-ILW H-mode plasmas have been investigated with EDGE2D-EIRENE. The simulations reproduce the experimentally observed factor of 10 reduction in the outer target power deposition when the normalized divertor radiation, Praddiv/PSOL, increases from the unseeded levels of 15% up to the 50% levels required for detachment. At these radiation levels, nitrogen is predicted dominate the total radiation with a contribution of 85%, consistent with previous measurements in JET-C. Due to the low radiative potential of nitrogen at the electron temperatures above 100 eV, more than 80% of the radiation is predicted to occur in the scrape-off layer, making nitrogen a suitable divertor radiator for typical JET divertor conditions with Te around 30 eV. The simulations reproduce the experimentally observed particle flux reduction at the low-field side target without the need for strong recombination. This is due to strong impurity radiation reducing the power levels entering the deuterium ionization front.

AB - Abstract Nitrogen seeded JET-ILW H-mode plasmas have been investigated with EDGE2D-EIRENE. The simulations reproduce the experimentally observed factor of 10 reduction in the outer target power deposition when the normalized divertor radiation, Praddiv/PSOL, increases from the unseeded levels of 15% up to the 50% levels required for detachment. At these radiation levels, nitrogen is predicted dominate the total radiation with a contribution of 85%, consistent with previous measurements in JET-C. Due to the low radiative potential of nitrogen at the electron temperatures above 100 eV, more than 80% of the radiation is predicted to occur in the scrape-off layer, making nitrogen a suitable divertor radiator for typical JET divertor conditions with Te around 30 eV. The simulations reproduce the experimentally observed particle flux reduction at the low-field side target without the need for strong recombination. This is due to strong impurity radiation reducing the power levels entering the deuterium ionization front.

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U2 - 10.1016/j.jnucmat.2014.10.047

DO - 10.1016/j.jnucmat.2014.10.047

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SP - 135

EP - 142

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

M1 - 48544

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