We report the design and the performance of the ten-point Thomson scattering system installed on Helical Symmetry Experiment (HSX). Based upon the design of the GA Thomson scattering system, the HSX Thomson scattering system covers the complete plasma cross section, providing a ten-point plasma parameter profile measurement during a single plasma shot. The system consists of a commercial 1 J–10 ns yttrium–aluminum–garnet laser, ten polychromators from GA, the specially designed collection optics, a CAMAC data acquisition unit, and a controlling computer. The high throughput collection optics enables measurement even at a plasma density of 0.5×1012 cm−3. The system configuration, spectral response calibration, Raman calibration of the system, and operational results are presented.
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Zhai et al. (2004) studied this question.