TY - JOUR
T1 - Investigation of the influence of divertor recycling on global plasma confinement in JET ITER-like wall
AU - Tamain, P.
AU - Joffrin, E.
AU - Bufferand, H.
AU - Järvinen, Aaro
AU - Brezinsek, S.
AU - Ciraolo, G.
AU - Delabie, E.
AU - Frassinetti, L.
AU - Giroud, C.
AU - Groth, M.
AU - Lipschultz, B.
AU - Lomas, P.
AU - Marsen, S.
AU - Menmuir, S.
AU - Oberkofler, M.
AU - Stamp, M.
AU - Wiesen, S.
AU - JET-EFDA contributors
N1 - Funding Information:
This work, supported by the European Communities under the contract of Association between EURATOM and CEA, was carried out within the framework of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Computations have been performed at the Mésocentre d’Aix-Marseille Université.
Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2015/7/22
Y1 - 2015/7/22
N2 - Abstract The impact of the divertor geometry on global plasma confinement in type I ELMy H-mode has been investigated in the JET tokamak equipped with ITER-Like Wall. Discharges have been performed in which the position of the strike-points was changed while keeping the bulk plasma equilibrium essentially unchanged. Large variations of the global plasma confinement have been observed, the H98 factor changing from typically 0.7 when the outer strike-point is on the vertical or horizontal targets to 0.9 when it is located in the pump duct entrance. Profiles are mainly impacted in the pedestal but core gradient lengths, especially for the density, are also modified. Although substantial differences are observed in the divertor conditions, none seem to correlate directly with the confinement. Modelling with the EDGE2D-EIRENE and SOLEDGE2D-EIRENE transport codes exhibits differences in the energy losses due to neutrals inside the separatrix, but orders of magnitude are too low to explain simply the impact on the confinement.
AB - Abstract The impact of the divertor geometry on global plasma confinement in type I ELMy H-mode has been investigated in the JET tokamak equipped with ITER-Like Wall. Discharges have been performed in which the position of the strike-points was changed while keeping the bulk plasma equilibrium essentially unchanged. Large variations of the global plasma confinement have been observed, the H98 factor changing from typically 0.7 when the outer strike-point is on the vertical or horizontal targets to 0.9 when it is located in the pump duct entrance. Profiles are mainly impacted in the pedestal but core gradient lengths, especially for the density, are also modified. Although substantial differences are observed in the divertor conditions, none seem to correlate directly with the confinement. Modelling with the EDGE2D-EIRENE and SOLEDGE2D-EIRENE transport codes exhibits differences in the energy losses due to neutrals inside the separatrix, but orders of magnitude are too low to explain simply the impact on the confinement.
UR - http://www.scopus.com/inward/record.url?scp=84944866411&partnerID=8YFLogxK
U2 - 10.1016/j.jnucmat.2014.12.021
DO - 10.1016/j.jnucmat.2014.12.021
M3 - Article
AN - SCOPUS:84944866411
VL - 463
SP - 450
EP - 454
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
M1 - 48752
ER -