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; Aaro Järvinen; H.T. Kim; F. Koechl; U. Kruezi; B. Lipschutz; P. J. Lomas; 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; JET Contributors

doi:10.1088/1741-4326/aa6e1c

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, Aaro Järvinen, H.T. Kim, F. Koechl, U. Kruezi, B. Lipschutz, P. J. LomasE. 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, JET Contributors

^*Corresponding author for this work

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

29 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 language	English
Article number	086025
Journal	Nuclear Fusion
Volume	57
Issue number	8
DOIs	https://doi.org/10.1088/1741-4326/aa6e1c
Publication status	Published - 30 Jun 2017
MoE publication type	A1 Journal article-refereed

Keywords

confinement
divertor
neutrals

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/1741-4326/aa6e1c

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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., Järvinen, A., Kim, H. T., Koechl, F., Kruezi, U., Lipschutz, B., ... JET Contributors (2017). Impact of divertor geometry on H-mode confinement in the JET metallic wall. Nuclear Fusion, 57(8), Article 086025. https://doi.org/10.1088/1741-4326/aa6e1c

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title = "Impact of divertor geometry on H-mode confinement in the JET metallic wall",

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.",

keywords = "confinement, divertor, neutrals",

author = "E. Joffrin and P. Tamain and E. Belonohy and H. Bufferand and P. Buratti and Challis, {C. D.} and E. Delabie and P. Drewelow and D. Dodt and L. Frassinetti and J. Garcia and C. Giroud and M. Groth and J. Hobirk and Aaro J{\"a}rvinen and H.T. Kim and F. Koechl and U. Kruezi and B. Lipschutz and Lomas, {P. J.} and {De La Luna}, E. and T. Loarer and P. Maget and C. Maggi and G. Matthews and F. Maviglia and A. Meigs and I. Nunes and G. Pucella and F. Rimini and S. Saarelma and E. Solano and Sips, {A. C.C.} and M. Tsalas and I. Voitsekhovitch and H. Weisen and {JET Contributors}",

year = "2017",

month = jun,

day = "30",

doi = "10.1088/1741-4326/aa6e1c",

language = "English",

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journal = "Nuclear Fusion",

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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, Järvinen, A, 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 & JET Contributors 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

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 - Järvinen, Aaro

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.

AU - JET Contributors

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

AN - SCOPUS:85026521047

SN - 0029-5515

VL - 57

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 8

M1 - 086025

ER -

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

Abstract

Keywords

UN SDGs

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