A new custom-built duo spectrometer has been commissioned for fast localized Doppler measurements of plasma ions in the Madison Symmetric Torus. The instrument combines very high optical throughput (transmission efficiency of 6% and etendue of divided into two simultaneous measurements) with good resolution . The design is a double grating variant of the Czerny-Turner layout and has been carefully optimized for fast measurements of the line at . The instrument is currently being applied for high speed charge exchange recombination spectroscopy measurements.
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