research article
Signature of turbulent zonal flows observed in the DIII-D tokamak
The spectrum of turbulent density fluctuations at long poloidal wavelengths in the edge plasma of the DIII-D tokamak peaks at nonzero radial wave number. The associated electric-potential fluctuations cause sheared E~×B flows primarily in the poloidal direction. These zonal flows have been predicted by theory and are believed to regulate the overall level of turbulence and anomalous transport. This study provides the first indirect experimental identification of zonal flows.
Type
research article
Author(s)
Date Issued
2001
Published in
Volume
86
Issue
21
Start page
4835
End page
4838
Editorial or Peer reviewed
REVIEWED
Written at
EPFL
Available on Infoscience
April 16, 2008
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