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Vertical localization of phase contrast imaging diagnostic in Alcator C-Mod
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Principle of phase contrast imaging.

Image of FIG. 2.
FIG. 2.

(Color online) PCI wave number detection capability. Two peaks at 2.8 and on the spectrum correspond to the PCI diagnostic measurement of the 15 and sound waves, respectively.

Image of FIG. 3.
FIG. 3.

(Color online) Magnetic pitch angle vs vertical coordinate for a typical shot. The thickness of curve indicates the range of pitch angle across the 32 PCI viewing chords.

Image of FIG. 4.
FIG. 4.

(Color online) Localization hardware setup.

Image of FIG. 5.
FIG. 5.

(Color online) Physics principle of the vertical localization through the magnetic pitch angle change along the beam.

Image of FIG. 6.
FIG. 6.

(Color online) Frequency/wave number spectra of plasma fluctuations measured by the PCI diagnostic. 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 and (b) the top plasma view.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Vertical localization of phase contrast imaging diagnostic in Alcator C-Mod