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 | |
| Publication status | Published - 30 Jun 2017 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- confinement
- divertor
- neutrals
Cite this
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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 journal › Article › Scientific › peer-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 -