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Pedestal density fluctuation dynamics during the inter-ELM cycle in DIII-D a)
a)Paper GI2 4, Bull. Am. Phys. Soc. 55, 107 (2010).
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10.1063/1.3590936
/content/aip/journal/pop/18/5/10.1063/1.3590936
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/5/10.1063/1.3590936
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Basic parameters: (a) current, (b) toroidal field, (c) electron density, (d) , and (e) in the experiment.

Image of FIG. 2.
FIG. 2.

(Color online) Equilibrium of plasma from EFIT with BES diagnostic image locations overlaid.

Image of FIG. 3.
FIG. 3.

(Color) (a) Electron pressure profiles, (b) radial electric field across pedestal region, and (c) poloidal cross spectrum (upper panel) and cross phase () (lower panel) of density fluctuations from BES measurements at for four different radial locations: (black), (blue), (red), and (green). The blue region (positive cross phase) indicates turbulence propagating in the ion diamagnetic direction in the lab frame and the yellow region (negative cross phase) indicates turbulence propagating in the electron diamagnetic direction.

Image of FIG. 4.
FIG. 4.

(Color) Poloidal cross spectrum (upper panel) and cross phase (lower panel) of density fluctuations from BES measurements at for three different : (black), (red), and (blue).

Image of FIG. 5.
FIG. 5.

(Color online) Turbulent group velocity from BES measurements for lower frequency band 50–150 kHz (triangles), higher frequency band 200–350 kHz (squares), and velocity (solid line) from CER measurements for three different values: (a) , (b) , and (c) .

Image of FIG. 6.
FIG. 6.

Turbulence decorrelation rate profile from BES measurements (diamonds) and shearing rate profile at .

Image of FIG. 7.
FIG. 7.

(Color online) (a) Radial correlation function for lower frequency band (50–150 kHz) for three different values; (b) Poloidal correlation function for lower frequency band (50–150 kHz) for three different values.

Image of FIG. 8.
FIG. 8.

Skewness of density fluctuations (50–150 kHz) from BES measurements for different radial locations at .

Image of FIG. 9.
FIG. 9.

(Color) Pedestal density fluctuation cross spectrum and cross phase () for different times relative to the peak of the light that indicates an ELM event at three values of (a) , (b) , and (c) near maximal pressure gradient location. Different colors correspond to different times after an ELM crash. The blue region (positive cross phase) indicates turbulence propagating in the ion diamagnetic direction in the lab frame and the yellow region (negative cross phase) indicates turbulence propagating in the electron diamagnetic direction.

Image of FIG. 10.
FIG. 10.

(Color online) Pedestal electron pressure, electron density, and electron temperature gradients for different times relative to an ELM crash (triangles) normalized by the maximal value during the inter-ELM cycle, and the relative density fluctuation amplitude integrated over 50–150 kHz from BES measurements during the same time window normalized by the maximal value (diamonds) for (a-c) and (d-f) .

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2011-05-26
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Pedestal density fluctuation dynamics during the inter-ELM cycle in DIII-D a)
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/5/10.1063/1.3590936
10.1063/1.3590936
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