Enhanced -->E*-->B drift effects in the TCV snowflake divertor

TitleEnhanced -->E*-->B drift effects in the TCV snowflake divertor
Publication TypeJournal Article
Year of Publication2015
AuthorsG.P. Canal, T. Lunt, H. Reimerdes, B.P Duval, B. Labit, W.AJ Vijvers, TCV team
JournalNuclear Fusion
Volume55
Issue12
Pagination123023
Abstract

Measurements of various plasma parameters at the divertor targets of snowflake (SF) and conventional single-null configurations indicate an enhanced effect of the -->E*-->B drift in the scrape-off layer of plasmas in the SF configuration. Plasma boundary transport simulations using the EMC3-Eirene code show that the poloidal gradients of the kinetic profiles in the vicinity of the null-point of a SF divertor are substantially larger than those of a conventional single-null configuration. These gradients are expected to drive larger -->E*-->B flows in the SF divertor and are thought to be responsible for the formation of the double-peaked particle and heat flux target profiles observed experimentally. Experiments in forward and reversed toroidal magnetic field directions further support this conclusion. The formation of such a double-peaked profiles is enhanced at higher plasma densities and may have beneficial effects on the divertor heat loads since they lead to broader target profiles and lower peak heat fluxes.

URLhttp://pubman.mpdl.mpg.de/pubman/item/escidoc:2228391:2/component/escidoc:2391697/Canal_Enhanced.pdf
DOI10.1088/0029-5515/55/12/123023
Division

FP

Department

PDG

PID4218b275031b009ff3322c11d6691852
Alternate TitleNucl. Fusion
LabelOA

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