Spatial distribution of turbulence in the Wendelstein 7-AS stellarator

N. P. Basse, P. K. Michelsen, S. Zoletnik, M. Saffman, M. Endler, M. Hirsch

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In this paper measurements of short wavelength electron density fluctuations using collective scattering of infrared light are presented. The Wendelstein 7-AS (W7-AS) stellarator (Renner H et al 1989 Plasma Phys. Control. Fusion 31 1579) and the diagnostic are briefly described. A series of plasma discharges with reproducible confinement transitions was created by ramping up the plasma current. Utilizing the fact that the density fluctuation wavenumber κ is anisotropic in the directions parallel and perpendicular to the local magnetic field, the diagnostic can provide a radial profile of the turbulence during both normal and degraded confinement. The found profiles display an increase of core turbulence for the reduced confinement state. The results are discussed and compared to similar tokamak measurements.

Original languageEnglish
JournalPlasma Sources Science and Technology
Volume11
Issue number3 A
Publication statusPublished - Aug 2002

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stellarators
spatial distribution
turbulence
plasma currents
profiles
plasma jets
fusion
scattering
magnetic fields
wavelengths

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Condensed Matter Physics

Cite this

Basse, N. P., Michelsen, P. K., Zoletnik, S., Saffman, M., Endler, M., & Hirsch, M. (2002). Spatial distribution of turbulence in the Wendelstein 7-AS stellarator. Plasma Sources Science and Technology, 11(3 A).

Spatial distribution of turbulence in the Wendelstein 7-AS stellarator. / Basse, N. P.; Michelsen, P. K.; Zoletnik, S.; Saffman, M.; Endler, M.; Hirsch, M.

In: Plasma Sources Science and Technology, Vol. 11, No. 3 A, 08.2002.

Research output: Contribution to journalArticle

Basse, NP, Michelsen, PK, Zoletnik, S, Saffman, M, Endler, M & Hirsch, M 2002, 'Spatial distribution of turbulence in the Wendelstein 7-AS stellarator', Plasma Sources Science and Technology, vol. 11, no. 3 A.
Basse, N. P. ; Michelsen, P. K. ; Zoletnik, S. ; Saffman, M. ; Endler, M. ; Hirsch, M. / Spatial distribution of turbulence in the Wendelstein 7-AS stellarator. In: Plasma Sources Science and Technology. 2002 ; Vol. 11, No. 3 A.
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