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Spatial distribution of turbulence in the Wendelstein 7-AS stellarator

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Endler,  M.
Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society;

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Hirsch,  M.
Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

Basse, N. P., Michaelsen, P. K., Zoletnik, S., Saffman, M., Endler, M., & Hirsch, M. (2002). Spatial distribution of turbulence in the Wendelstein 7-AS stellarator. Plasma Sources Science & Technology, 11(3A Sp. Iss. SI), A138-A142.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-40AE-8
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 kappa 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.