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Upgrade of the helically symmetric experiment Thomson scattering diagnostic suite
W R Goodman1, E R Scott1, Z Keith1
1HSX Plasma Laboratory, University of Wisconsin, Madison, Wisconsin 53703, USA.
Abstract:
The Helically Symmetric eXperiment (HSX) Thomson Scattering (TS) diagnostic is being upgraded to decrease uncertainty in electron temperature and density measurements. Upgrades to the HSX TS diagnostic will consist of a novel redesign of polychromator electronics and digitization of the TS output signal. Here, we also present a study of the benefits of an additional spectral channel that will sample the red-shifted band of the scattered spectrum. To maximize system bandwidth (BW) and gain, while minimizing noise, the existing low-BW polychromator electronics on HSX will be replaced by high-BW, high gain circuitry designed in-house.
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