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Ultra-fast charge exchange spectroscopy for turbulent ion temperature fluctuation measurements on the DIII-D tokamak (invited)a)
a)Invited paper, published as part of the Proceedings of the 19th Topical Conference on High-Temperature Plasma Diagnostics, Monterey, California, May 2012.
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic of the UF-CHERS spectrometer and the APD detector box are shown.

Image of FIG. 2.
FIG. 2.

Measured instrument profile from a single spectral channel.

Image of FIG. 3.
FIG. 3.

Example signals for L-mode ECH and beam heated discharges (shot # 146351). (a) UF-CHERS peak spectral channel, (left axis) UF-CHERS side spectral channel, (right axis). (b) The 150 L beam power (left axis), and ECH power (right axis).

Image of FIG. 4.
FIG. 4.

Line profile from Doppler broadened C VI emission. Δt = 1 μs. Dots show the data after the background subtraction, whereas triangles show the data for background emission.

Image of FIG. 5.
FIG. 5.

For an example L-mode discharge, the ion temperature measurements from the UF-CHERS (blue) and the nearby CER chord (black).

Image of FIG. 6.
FIG. 6.

The ion temperature measurements profile comparison.

Image of FIG. 7.
FIG. 7.

Cross power spectral density for 2-point Ti measurements are shown in solid red. The uncorrelated measurements (noise floor) are shown in blue dashed line.

Image of FIG. 8.
FIG. 8.

Measured density fluctuation cross power spectral using the nearby BES channels.

Image of FIG. 9.
FIG. 9.

Cross power spectral density measurements of (a) the ion temperature, (b) the line of sight velocity with the adjacent BES channel.

Image of FIG. 10.
FIG. 10.

The coherency spectra (a) and the cross-correlation measurements (b) between the ion temperature fluctuations from the UF-CHERS and the density fluctuation measurements from the BES diagnostic as a function of poloidal separation are shown.

Image of FIG. 11.
FIG. 11.

Signal-to-noise ratio (a) and the internal gain (b) are measured as a function of the reverse bias voltage.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ultra-fast charge exchange spectroscopy for turbulent ion temperature fluctuation measurements on the DIII-D tokamak (invited)a)