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Edge turbulence measurements in electron-heated Helically Symmetric Experiment plasmas
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View: Figures


Image of FIG. 1.
FIG. 1.

Probe configurations used for the turbulence measurements at two different toroidal locations, and . A poloidal cut of the QHS flux surfaces is also shown for each location.

Image of FIG. 2.
FIG. 2.

Edge electron temperatures measured by the Thomson scattering (squares) and a double probe (crosses) for a 0.5 T QHS plasma .

Image of FIG. 3.
FIG. 3.

Normalized fluctuation levels measured in both the QHS and Mirror configurations. Also shown is the mixing length estimate used in the Weiland model.

Image of FIG. 4.
FIG. 4.

Power spectra of and at for both QHS and Mirror configurations.

Image of FIG. 5.
FIG. 5.

Local spectra (conditioned on the fluctuation amplitude at each frequency) for the QHS configuration at . The bold solid line is the average poloidal wavenumber at each frequency .

Image of FIG. 6.
FIG. 6.

Local poloidal wavenumber spectra for the QHS and Mirror configurations for the same conditions as Fig. 5.

Image of FIG. 7.
FIG. 7.

Radial correlation lengths vs line-averaged density at for QHS and Mirror configurations.

Image of FIG. 8.
FIG. 8.

Spectrum averaged phase velocities for the QHS density scan data (triangles), local velocity determined by the radially separated floating potential measurements (diamonds), and mode velocity from the Weiland model (square).

Image of FIG. 9.
FIG. 9.

(a) Turbulent driven particle flux at for QHS and Mirror plasmas, measured with the LFS probe. (b) Turbulent driven particle fluxes from both LFS and HFS probes in the QHS configuration.

Image of FIG. 10.
FIG. 10.

Measured turbulent particle flux from the LFS probe for the QHS density scans (closed squares). Also shown are values determined from 3D DEGAS simulations (circles) and predicted from the Weiland model (open square).

Image of FIG. 11.
FIG. 11.

(a) Amplitude of density-potential cross power spectra, (b) poloidal wavenumber, (c) density-potential cross phase, and (d) transport spectra for lower (solid) and higher (dashed) density QHS discharges.

Image of FIG. 12.
FIG. 12.

(a) Floating potential profiles in the low and high density discharges of HSX. (b) Calculated shear rates using the floating potential profiles and Eq. (8).

Image of FIG. 13.
FIG. 13.

Normalized fluctuation levels measured in the QHS configuration for both LFS and HFS probes.

Image of FIG. 14.
FIG. 14.

Measured mean density-potential cross phase vs local poloidal wavenumber. The thin lines represent the standard deviation of the measured cross phase. Also shown is the cross phase from the Weiland linear stability calculation.

Image of FIG. 15.
FIG. 15.

Experimentally inferred growth rates for the high density QHS discharge . Also shown is the linear prediction from the Weiland model.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Edge turbulence measurements in electron-heated Helically Symmetric Experiment plasmas