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Prospects for the Thomson scattering system on NSTX-Upgradea)
a)Contributed 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.

NSTX-U midplane cross section shows the new laser beam path next to the old path, and the collection optics (at bay F).

Image of FIG. 2.
FIG. 2.

(a) Ray tracing using OSLO showing both the old and new laser beam paths. (b) Close-up on the optics box depicting the displaced fiber holder associated with rays in (a).

Image of FIG. 3.
FIG. 3.

Shown here is a comparison of the image rms size at the fiber holder for the two configurations (NSTX and NSTX-U). The resolution is better than a fiber diameter (535 μm).

Image of FIG. 4.
FIG. 4.

Transmission curves (folding in the detector quantum efficiency) with examples of the computed Thomson scattered spectra at 6 keV and 200 eV (see Ref. 7).

Image of FIG. 5.
FIG. 5.

(Top) Electron temperature relative error as a function of measured temperature for both neutral beam heated and high harmonic fast wave heated discharges. Comparison between 4- and 6-filter polychromators. (Bottom) Close-up look at the low temperature range. Note the corresponding densities are also included in the plots. The inset represents the simulated polychromator response with the actual experimental data overlaid.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Prospects for the Thomson scattering system on NSTX-Upgradea)