Characterization of the W7-X scrape-off layer using reciprocating probes: Paper

Research output: Contribution to journalJournal article – Annual report year: 2019Researchpeer-review

DOI

  • Author: Killer, Carsten

    Max Planck Institute for Plasma Physics, Germany

  • Author: Grulke, Olaf

    Department of Physics, Technical University of Denmark, Fysikvej, DK-2800, Kgs. Lyngby, Denmark

  • Author: Drews, Philipp

    Forschungszentrum Jülich GmbH, Germany

  • Author: Gao, Yu-Tang

    Forschungszentrum Jülich GmbH, Germany

  • Author: Jakubowski, Marcin

    Max Planck Institute for Plasma Physics, Germany

  • Author: Knieps, Alexander

    Forschungszentrum Jülich GmbH, Germany

  • Author: Nicolai, Dirk

    Forschungszentrum Jülich GmbH, Germany

  • Author: Niemann, Holger

    Max Planck Institute for Plasma Physics, Germany

  • Author: Sitjes, Aleix Puig

    Max Planck Institute for Plasma Physics, Germany

  • Author: Satheeswaran, Guruparan

    Forschungszentrum Jülich GmbH, Germany

  • Author: W7-X Team

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The W7-X scrape-off layer (SOL) with its characteristic magnetic island chain has been investigated using electric probes mounted on a reciprocating manipulator close to the outboard mid-plane. A survey of the W7-X configuration space shows that the presence and particular topology of magnetic islands significantly affects the SOL profiles of electron temperature, density, electric field and plasma flows. Particularly relevant for divertor operation, very wide SOL heat flux profiles have been observed in some magnetic configurations, which we link to the presence of magnetic islands. In these situations, the islands can feature a local minimum of the plasma potential accompanied by a direction reversal of E x B driven dynamics measured by probe arrays.
Original languageEnglish
Article number086013
JournalNuclear Fusion
Volume59
Issue number8
Number of pages13
ISSN0029-5515
DOIs
Publication statusPublished - 2019
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

  • Scrape-off layer, Stallarator, Langmuir probes

ID: 183625140