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Enhanced Transport at High Plasma Pressure and Subthreshold Kinetic Ballooning Modes in Wendelstein 7-X.
Mulholland, P; Aleynikova, K; Faber, B J; Pueschel, M J; Proll, J H E; Hegna, C C; Terry, P W; Nührenberg, C.
Affiliation
  • Mulholland P; Eindhoven University of Technology, 5600 MB Eindhoven, Netherlands.
  • Aleynikova K; Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany.
  • Faber BJ; University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
  • Pueschel MJ; Eindhoven University of Technology, 5600 MB Eindhoven, Netherlands.
  • Proll JHE; Dutch Institute for Fundamental Energy Research, 5612 AJ Eindhoven, Netherlands.
  • Hegna CC; Department of Physics and Astronomy, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
  • Terry PW; Eindhoven University of Technology, 5600 MB Eindhoven, Netherlands.
  • Nührenberg C; University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Phys Rev Lett ; 131(18): 185101, 2023 Nov 03.
Article in En | MEDLINE | ID: mdl-37977609
ABSTRACT
High-performance fusion plasmas, requiring high pressure ß, are not well understood in stellarator-type experiments. Here, the effect of ß on ion-temperature-gradient-driven (ITG) turbulence is studied in Wendelstein 7-X (W7-X), showing that subdominant kinetic ballooning modes (KBMs) are unstable well below the ideal MHD threshold and get strongly excited in the turbulence. By zonal-flow erosion, these subthreshold KBMs (stKBMs) affect ITG saturation and enable higher heat fluxes. Controlling stKBMs will be essential to allow W7-X and future stellarators to achieve maximum performance.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2023 Document type: Article Affiliation country: Netherlands
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Add to My VHL
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XML
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2023 Document type: Article Affiliation country: Netherlands