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Simultaneous measurement of core electron temperature and density fluctuations during electron cyclotron heating on DIII-D
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10.1063/1.3318469
/content/aip/journal/pop/17/2/10.1063/1.3318469
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/2/10.1063/1.3318469
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Radial profiles of (a) electron temperature and (b) , (c) density, and (d) , (e) ion temperature and (f) for the cases with ECH and NBI heating (red dashed) and NBI heating only (black solid) are plotted vs , the normalized square root of the toroidal flux. Derivatives are calculated with respect to non-normalized square root of toroidal flux. The dotted lines indicate the standard deviation calculated from an ensemble of 100 profile fits. ECH power is deposited at in the case with ECH (red). Electron temperature and density fluctuations are measured at , 0.6, and 0.7 (shading).

Image of FIG. 2.
FIG. 2.

(a) and (b) in cases with no ECH (black solid) and with ECH (red dashed). The mean diffusivity and standard deviation (dotted lines) are calculated from an ensemble of 100 ONETWO analyses using as input 100 sets of spline fits to measured radial profiles. Electron temperature and density fluctuations are measured between (yellow shading).

Image of FIG. 3.
FIG. 3.

Spectra of (a) density fluctuations and (b) electron temperature fluctuations measured at in the L-mode with ECH and NBI heating (red dashed) and with NBI heating only (black solid). Fluctuation levels (40–400 kHz) are recorded in the figure. Electron temperature fluctuation amplitude increases 50% in the case with ECH; density fluctuation amplitude does not change.

Image of FIG. 4.
FIG. 4.

The profile of the relative amplitudes of (a) density fluctuations and (b) electron temperature fluctuations with ECH and NBI heating (red circles) and with NBI heating only (black squares). The green shaded region in (b) indicates the noise limit for measurements.

Image of FIG. 5.
FIG. 5.

The change in [(a), (c), and (e)] TEM and [(b), (d), and (f)] ITG mode growth rates at three radii of interest is shown. The horizontal dashed line indicates the two-shot average (with and without ECH) of the flux-surface averaged shearing rate. The estimated wavenumber sensitivity range for the fluctuation diagnostics is indicated with shading.

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/content/aip/journal/pop/17/2/10.1063/1.3318469
2010-02-18
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Simultaneous measurement of core electron temperature and density fluctuations during electron cyclotron heating on DIII-D
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/2/10.1063/1.3318469
10.1063/1.3318469
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