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

doi:10.1088/0963-0252/11/3A/320

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 journal › Conference article › Research › peer-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 language	English
Journal	Plasma Sources Science and Technology
Volume	11
Issue number	3A
Pages (from-to)	A138-A142
ISSN	0963-0252
DOIs	https://doi.org/10.1088/0963-0252/11/3A/320
Publication status	Published - 2002
Event	25th International Conference on Phenomena in Ionized Gases - Nagoya, Japan Duration: 17 Jul 2001 → 22 Jul 2001 Conference number: 25

Conference

Conference	25th International Conference on Phenomena in Ionized Gases
Number	25
Country/Territory	Japan
City	Nagoya
Period	17/07/2001 → 22/07/2001

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title = "Spatial distribution of turbulence in the Wendelstein 7-AS stellarator (invited paper)",

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.",

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author = "N.P. Basse and Poul Michelsen and S. Zoletnik and M. Saffman and M. Endler and M. Hirsch",

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language = "English",

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T1 - Spatial distribution of turbulence in the Wendelstein 7-AS stellarator (invited paper)

AU - Basse, N.P.

AU - Michelsen, Poul

AU - Zoletnik, S.

AU - Saffman, M.

AU - Endler, M.

AU - Hirsch, M.

N1 - Conference code: 25

PY - 2002

Y1 - 2002

N2 - 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.

AB - 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.

KW - 6-I optik

U2 - 10.1088/0963-0252/11/3A/320

DO - 10.1088/0963-0252/11/3A/320

M3 - Conference article

SN - 0963-0252

VL - 11

SP - A138-A142

JO - Plasma Sources Science and Technology

JF - Plasma Sources Science and Technology

IS - 3A

T2 - 25th International Conference on Phenomena in Ionized Gases

Y2 - 17 July 2001 through 22 July 2001

ER -

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

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