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Studies of turbulence and transport in Alcator C-Mod H-mode plasmas with phase contrast imaging and comparisons with GYRO
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10.1063/1.3057420
/content/aip/journal/pop/16/1/10.1063/1.3057420
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/1/10.1063/1.3057420
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Plasma parameters for the studied discharge: (a) Store energy; (b) neutron rate; (c) line-integrated electron density; (d) ICRF power; (e) light.

Image of FIG. 2.
FIG. 2.

Profiles of electron density (a) and temperature (b) from the Thomson scattering (TS) diagnostic (Ref. 18) are shown before the ITB onset (black diamond), during the ITB with only off-axis ICRF heating (blue triangle), and during the ITB after adding on-axis ICRF heating (red square). The solid line is a fit to the experimental measurements using FiTs. Two vertical dashed lines are the magnetic axis and last closed flux surface (LCFS), respectively.

Image of FIG. 3.
FIG. 3.

Principle of phase contrast imaging.

Image of FIG. 4.
FIG. 4.

Left: Magnetic pitch angle vs vertical coordinate . Right: Principle of vertical localization. The vertical beam (red online) passing through the whole plasma corresponds to the unscattered beam, while the beams originated from the bottom (blue online) and the top (green online) correspond to the scattered beams from the turbulence localized at and , respectively.

Image of FIG. 5.
FIG. 5.

Main plot: Spectrogram of a core PCI channel (17) vs time. Time resolution is and frequency resolution is . Bottom plot: Traces of on-axis (black) and off-axis [gray (red online)] ICRF power.

Image of FIG. 6.
FIG. 6.

Frequency/wavenumber spectra of plasma fluctuations measured by PCI in the H-mode plasma before the ITB formation. On the left corner of each plot, the diagnostic line-of-sight is shown according to the masking phase plate setup: (a) The bottom plasma view, (b) the top plasma view.

Image of FIG. 7.
FIG. 7.

Frequency/wavenumber spectra of plasma fluctuations measured by PCI in the ITB plasma with only off-axis ICRF heating. On the left corner of each plot, the diagnostic line-of-sight is shown according to the masking phase plate setup: (a) The bottom plasma view, (b) the top plasma view.

Image of FIG. 8.
FIG. 8.

Comparison of experimental and nonlinearly simulated thermal diffusivities: (a) Before the ITB onset; (b) during the ITB with only off-axis ICRF heating.

Image of FIG. 9.
FIG. 9.

(a) Impact of varying a correction factor applied to the measured ion temperature gradient in the ITB plasma with only off-axis ICRF heating, where . (b) Effect of the shear on turbulent transport in the ITB plasma with only off-axis ICRF heating, where .

Image of FIG. 10.
FIG. 10.

Impact of varying a correction factor applied to the measured density gradient on turbulent transport in the ITB plasma with only off-axis ICRF heating, where .

Image of FIG. 11.
FIG. 11.

(a) Synthetic PCI frequency/wavenumber spectra in the H-mode plasma before the ITB formation. A system response function has been implemented to emulate the top view configuration of the masked phase plate. (b) Comparison of the synthetic and experimental PCI wavenumber spectra integrated in the frequency range of .

Image of FIG. 12.
FIG. 12.

Synthetic PCI frequency/wavenumber spectra in the ITB with only off-axis ICRF heating. In the analysis, appropriate system response functions have been implemented to emulate the top view configuration of the masked phase plate.

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/content/aip/journal/pop/16/1/10.1063/1.3057420
2009-01-12
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Studies of turbulence and transport in Alcator C-Mod H-mode plasmas with phase contrast imaging and comparisons with GYRO
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/1/10.1063/1.3057420
10.1063/1.3057420
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