Observation of Marfes in the Wendelstein 7-X stellarator with inboard limiters

U. Wenzel, C. Biedermann, G. Kocsis, T. Szepesi, B. D. Blackwell, S. Klose, J. Knauer, M. Krychowiak, L. Stephey, O. Schmitz, J. Harris, R. König, T. S. Pedersen

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2 Citations (Scopus)

Abstract

In the first operational campaign of the Wendelstein 7-X (W7-X) stellarator we observed Marfe-like radiation belts at the plasma edge. We describe and analyze the behaviour of these radiation belts, especially with respect to the high density inside the belt, with a set of suitable diagnostics. We present evidence suggesting that these Marfe-like radiation belts are triggered by a drop of the edge temperature below 30 eV. From this observation we draw the conclusion that the physical cause of Marfes in tokamaks and Marfe-like radiation belts in W7-X is the same, namely radiative condensation. Furthermore, both exhibit the device symmetry, i.e. axisymmetry in a tokamak and the fivefold stellarator symmetry in W7-X.

Original languageEnglish
Article number096025
JournalNuclear Fusion
Volume58
Issue number9
DOIs
Publication statusPublished - Jul 11 2018

Keywords

  • Marfe
  • radiative condensation
  • stellarator

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Wenzel, U., Biedermann, C., Kocsis, G., Szepesi, T., Blackwell, B. D., Klose, S., Knauer, J., Krychowiak, M., Stephey, L., Schmitz, O., Harris, J., König, R., & Pedersen, T. S. (2018). Observation of Marfes in the Wendelstein 7-X stellarator with inboard limiters. Nuclear Fusion, 58(9), [096025]. https://doi.org/10.1088/1741-4326/aacb86