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