Abstract
A ${\mathrm{D}}_{2}$O far-infrared laser emitting 0.5J in 1.4 \ensuremath{\mu}s at 385 \ensuremath{\mu}m and a heterodyne receiver system comprising a Schottky barrier diode mixer with a noise temperature of 8000\ifmmode^\circ\else\textdegree\fi{} K (double sideband) were used in a Thomson scattering experiment to measure the ion temperature of a tokamak plasma during a single laser shot. Series of measurements under reproducible plasma conditions have been carried out in hydrogen, deuterium, and helium plasmas. Their statistical analysis yielded a typical relative error of 25% for a single shot measurement.
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