Spatial distribution of turbulence in the Wendelstein 7-AS stellarator (invited paper)

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

    Research output: Contribution to journalConference articleResearchpeer-review

    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 number3A
    Pages (from-to)A138-A142
    ISSN0963-0252
    DOIs
    Publication statusPublished - 2002
    Event25th International Conference on Phenomena in Ionized Gases - Nagoya, Japan
    Duration: 17 Jul 200122 Jul 2001
    Conference number: 25

    Conference

    Conference25th International Conference on Phenomena in Ionized Gases
    Number25
    CountryJapan
    CityNagoya
    Period17/07/200122/07/2001

    Fingerprint Dive into the research topics of 'Spatial distribution of turbulence in the Wendelstein 7-AS stellarator (invited paper)'. Together they form a unique fingerprint.

    Cite this