Collisionality dependent transport in TCV SOL plasmas

Research output: Contribution to journalJournal article – Annual report year: 2007Researchpeer-review

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Results are presented from probe measurements in the low field side scrape-off layer (SOL) region of TCV during plasma current scan experiments. It is shown that with decreasing plasma current the radial particle density profile becomes broader and the fluctuation levels and turbulence driven radial particle flux increase. In the far SOL the fluctuations exhibit a high degree of statistical similarity and the particle density and flux at the wall radius scale inversely with the plasma current. Together with previous TCV density scan experiments, this indicates that plasma fluctuations and radial transport increase with plasma collisionality. Such a collisionality dependence is consistent with a recent theory for radial blob motion, which suggests that filamentary structures become electrically disconnected from the target sheaths at large collisionality and thus experience less sheath dissipation. This increases the radial convective transport and is possibly linked to the discharge density limit.
Original languageEnglish
JournalPlasma Physics and Controlled Fusion
Volume49
Issue number12B
Pages (from-to)B47-B57
ISSN0741-3335
DOIs
Publication statusPublished - 2007
CitationsWeb of Science® Times Cited: No match on DOI
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