Implications of high density operation on SOL transport: A multimachine investigation

ASDEX Upgrade Team, COMPASS team, JET-EFDA Contributors

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33 Scopus citations

Abstract

Abstract The transition reported in L-mode plasmas leading to the formation of a density "shoulder" in the Scrape-off Layer (SOL) of tokamaks is investigated in the three ITER stepladder machines: COMPASS, ASDEX Upgrade (AUG) and JET. In AUG and JET, the broadening of the profiles can be observed at similar relative densities (ne/nGW ∼ 0.4-0.5) and coincides with a clear increase in the size of SOL filaments and the onset of the outer divertor detachment. In COMPASS, no transition is observed in the same density range: the divertor does not detach and no clear effect is observed neither in the profiles nor in the turbulence. This is explained as the result of an increase of intermittent transport triggered by the increased resistivity along filaments associated to divertor detachment. The transition conditions in AUG and JET are compared to foreseen ITER SOL parameters, and the implications are briefly discussed.

Original languageEnglish
Article number48516
Pages (from-to)123-127
Number of pages5
JournalJournal of Nuclear Materials
Volume463
DOIs
StatePublished - 22 Jul 2015
Externally publishedYes

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