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

A. E. Jaervinen; 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. Makkonen; C. Marchetto; S. Marsen; G. F. Matthews; A. G. Meigs; D. Moulton; M. F. Stamp; S. Wiesen; M. Wischmeier

doi: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

A. E. Jaervinen^*, 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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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/P<inf>SOL</inf>, 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 T<inf>e</inf> 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 language	English
Article number	48544
Pages (from-to)	135-142
Number of pages	8
Journal	Journal of Nuclear Materials
Volume	463
DOIs	https://doi.org/10.1016/j.jnucmat.2014.10.047
Publication status	Published - 22 Jul 2015
Event	Proceedings of the 21st International Conference on Plasma-Surface Interactions in Controlled Fusion Devices - Kanazawa, Japan Duration: 26 May 2014 → 30 May 2014

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Jaervinen, 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., ... Wischmeier, M. (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, 463, 135-142. Article 48544. https://doi.org/10.1016/j.jnucmat.2014.10.047

@article{e3dbc49761a84bc5bad5abaa682d2656,

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 = "Jaervinen, {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",

year = "2015",

month = jul,

day = "22",

doi = "10.1016/j.jnucmat.2014.10.047",

language = "English",

volume = "463",

pages = "135--142",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

note = "Proceedings of the 21st International Conference on Plasma-Surface Interactions in Controlled Fusion Devices ; Conference date: 26-05-2014 Through 30-05-2014",

}

Jaervinen, 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 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

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 - Jaervinen, 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.

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.

UR - http://www.scopus.com/inward/record.url?scp=84937677823&partnerID=8YFLogxK

U2 - 10.1016/j.jnucmat.2014.10.047

DO - 10.1016/j.jnucmat.2014.10.047

M3 - Article

AN - SCOPUS:84937677823

SN - 0022-3115

VL - 463

SP - 135

EP - 142

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

M1 - 48544

T2 - Proceedings of the 21st International Conference on Plasma-Surface Interactions in Controlled Fusion Devices

Y2 - 26 May 2014 through 30 May 2014

ER -

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

Abstract

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