Investigation of the influence of divertor recycling on global plasma confinement in JET ITER-like wall
2015 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 463, 450-454 p.Article in journal (Refereed) Published
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 H-98 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.
Place, publisher, year, edition, pages
2015. Vol. 463, 450-454 p.
IdentifiersURN: urn:nbn:se:kth:diva-172691DOI: 10.1016/j.jnucmat.2014.12.021ISI: 000358467200091ScopusID: 2-s2.0-84944866411OAI: oai:DiVA.org:kth-172691DiVA: diva2:850207
QC 201509012015-09-012015-08-272015-09-01Bibliographically approved