Impact of divertor geometry on H-mode confinement in the JET metallic wall

E. Joffrin, P. Tamain, E. Belonohy, H. Bufferand, P. Buratti, C. D. Challis, E. Delabie, P. Drewelow, D. Dodt, L. Frassinetti, J. Garcia, C. Giroud, M. Groth, J. Hobirk, A. E. Jarvinen, H. T. Kim, F. Koechl, U. Kruezi, B. Lipschutz, P. J. Lomas & 16 others E. De La Luna, T. Loarer, P. Maget, C. Maggi, G. Matthews, F. Maviglia, A. Meigs, I. Nunes, G. Pucella, F. Rimini, S. Saarelma, E. Solano, A. C.C. Sips, M. Tsalas, I. Voitsekhovitch, H. Weisen

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

Recent experiments with the ITER-like wall have demonstrated that changes in divertor strike point position are correlated with strong modification of the global energy confinement. The impact on energy confinement is observable both on the pedestal confinement and core normalised gradients. The corner configuration shows an increased core density gradient length and ion pressure indicating a better ion confinement. The study of neutral re-circulation indicates the neutral pressure in the main chamber varies inversely with the energy confinement and a correlation between the pedestal total pressure and the neutral pressure in the main chamber can be established. It does not appear that charge exchange losses nor momentum losses could explain this effect, but it may be that changes in edge electric potential are playing a role at the plasma edge. This study emphasizes the importance of the scrape-off layer (SOL) conditions on the pedestal and core confinement.

Original languageEnglish
Article number086025
JournalNuclear Fusion
Volume57
Issue number8
DOIs
Publication statusPublished - 30 Jun 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

geometry
chambers
gradients
charge exchange
energy
ions
momentum
electric potential
configurations

Keywords

  • confinement
  • divertor
  • neutrals

Cite this

Joffrin, E., Tamain, P., Belonohy, E., Bufferand, H., Buratti, P., Challis, C. D., ... Weisen, H. (2017). Impact of divertor geometry on H-mode confinement in the JET metallic wall. Nuclear Fusion, 57(8), [086025]. https://doi.org/10.1088/1741-4326/aa6e1c
Joffrin, E. ; Tamain, P. ; Belonohy, E. ; Bufferand, H. ; Buratti, P. ; Challis, C. D. ; Delabie, E. ; Drewelow, P. ; Dodt, D. ; Frassinetti, L. ; Garcia, J. ; Giroud, C. ; Groth, M. ; Hobirk, J. ; Jarvinen, A. E. ; Kim, H. T. ; Koechl, F. ; Kruezi, U. ; Lipschutz, B. ; Lomas, P. J. ; De La Luna, E. ; Loarer, T. ; Maget, P. ; Maggi, C. ; Matthews, G. ; Maviglia, F. ; Meigs, A. ; Nunes, I. ; Pucella, G. ; Rimini, F. ; Saarelma, S. ; Solano, E. ; Sips, A. C.C. ; Tsalas, M. ; Voitsekhovitch, I. ; Weisen, H. / Impact of divertor geometry on H-mode confinement in the JET metallic wall. In: Nuclear Fusion. 2017 ; Vol. 57, No. 8.
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abstract = "Recent experiments with the ITER-like wall have demonstrated that changes in divertor strike point position are correlated with strong modification of the global energy confinement. The impact on energy confinement is observable both on the pedestal confinement and core normalised gradients. The corner configuration shows an increased core density gradient length and ion pressure indicating a better ion confinement. The study of neutral re-circulation indicates the neutral pressure in the main chamber varies inversely with the energy confinement and a correlation between the pedestal total pressure and the neutral pressure in the main chamber can be established. It does not appear that charge exchange losses nor momentum losses could explain this effect, but it may be that changes in edge electric potential are playing a role at the plasma edge. This study emphasizes the importance of the scrape-off layer (SOL) conditions on the pedestal and core confinement.",
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Joffrin, E, Tamain, P, Belonohy, E, Bufferand, H, Buratti, P, Challis, CD, Delabie, E, Drewelow, P, Dodt, D, Frassinetti, L, Garcia, J, Giroud, C, Groth, M, Hobirk, J, Jarvinen, AE, Kim, HT, Koechl, F, Kruezi, U, Lipschutz, B, Lomas, PJ, De La Luna, E, Loarer, T, Maget, P, Maggi, C, Matthews, G, Maviglia, F, Meigs, A, Nunes, I, Pucella, G, Rimini, F, Saarelma, S, Solano, E, Sips, ACC, Tsalas, M, Voitsekhovitch, I & Weisen, H 2017, 'Impact of divertor geometry on H-mode confinement in the JET metallic wall', Nuclear Fusion, vol. 57, no. 8, 086025. https://doi.org/10.1088/1741-4326/aa6e1c

Impact of divertor geometry on H-mode confinement in the JET metallic wall. / Joffrin, E.; Tamain, P.; Belonohy, E.; Bufferand, H.; Buratti, P.; Challis, C. D.; Delabie, E.; Drewelow, P.; Dodt, D.; Frassinetti, L.; Garcia, J.; Giroud, C.; Groth, M.; Hobirk, J.; Jarvinen, A. E.; Kim, H. T.; Koechl, F.; Kruezi, U.; Lipschutz, B.; Lomas, P. J.; De La Luna, E.; Loarer, T.; Maget, P.; Maggi, C.; Matthews, G.; Maviglia, F.; Meigs, A.; Nunes, I.; Pucella, G.; Rimini, F.; Saarelma, S.; Solano, E.; Sips, A. C.C.; Tsalas, M.; Voitsekhovitch, I.; Weisen, H.

In: Nuclear Fusion, Vol. 57, No. 8, 086025, 30.06.2017.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Impact of divertor geometry on H-mode confinement in the JET metallic wall

AU - Joffrin, E.

AU - Tamain, P.

AU - Belonohy, E.

AU - Bufferand, H.

AU - Buratti, P.

AU - Challis, C. D.

AU - Delabie, E.

AU - Drewelow, P.

AU - Dodt, D.

AU - Frassinetti, L.

AU - Garcia, J.

AU - Giroud, C.

AU - Groth, M.

AU - Hobirk, J.

AU - Jarvinen, A. E.

AU - Kim, H. T.

AU - Koechl, F.

AU - Kruezi, U.

AU - Lipschutz, B.

AU - Lomas, P. J.

AU - De La Luna, E.

AU - Loarer, T.

AU - Maget, P.

AU - Maggi, C.

AU - Matthews, G.

AU - Maviglia, F.

AU - Meigs, A.

AU - Nunes, I.

AU - Pucella, G.

AU - Rimini, F.

AU - Saarelma, S.

AU - Solano, E.

AU - Sips, A. C.C.

AU - Tsalas, M.

AU - Voitsekhovitch, I.

AU - Weisen, H.

PY - 2017/6/30

Y1 - 2017/6/30

N2 - Recent experiments with the ITER-like wall have demonstrated that changes in divertor strike point position are correlated with strong modification of the global energy confinement. The impact on energy confinement is observable both on the pedestal confinement and core normalised gradients. The corner configuration shows an increased core density gradient length and ion pressure indicating a better ion confinement. The study of neutral re-circulation indicates the neutral pressure in the main chamber varies inversely with the energy confinement and a correlation between the pedestal total pressure and the neutral pressure in the main chamber can be established. It does not appear that charge exchange losses nor momentum losses could explain this effect, but it may be that changes in edge electric potential are playing a role at the plasma edge. This study emphasizes the importance of the scrape-off layer (SOL) conditions on the pedestal and core confinement.

AB - Recent experiments with the ITER-like wall have demonstrated that changes in divertor strike point position are correlated with strong modification of the global energy confinement. The impact on energy confinement is observable both on the pedestal confinement and core normalised gradients. The corner configuration shows an increased core density gradient length and ion pressure indicating a better ion confinement. The study of neutral re-circulation indicates the neutral pressure in the main chamber varies inversely with the energy confinement and a correlation between the pedestal total pressure and the neutral pressure in the main chamber can be established. It does not appear that charge exchange losses nor momentum losses could explain this effect, but it may be that changes in edge electric potential are playing a role at the plasma edge. This study emphasizes the importance of the scrape-off layer (SOL) conditions on the pedestal and core confinement.

KW - confinement

KW - divertor

KW - neutrals

UR - http://www.scopus.com/inward/record.url?scp=85026521047&partnerID=8YFLogxK

U2 - 10.1088/1741-4326/aa6e1c

DO - 10.1088/1741-4326/aa6e1c

M3 - Article

VL - 57

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 8

M1 - 086025

ER -

Joffrin E, Tamain P, Belonohy E, Bufferand H, Buratti P, Challis CD et al. Impact of divertor geometry on H-mode confinement in the JET metallic wall. Nuclear Fusion. 2017 Jun 30;57(8). 086025. https://doi.org/10.1088/1741-4326/aa6e1c