Filtered Thomson scattering in an argon plasma
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A filtered Thomson scattering technique has been developed. This technique has successfully demonstrated the capability to detect Thomson scattered light from a plasma in the presence of strong scattered light and high plasma luminosity. It relies on a rubidium vapor filter cell to provide strong attenuation of stray scattered laser light at the central wavelength of the laser whilst simultaneously allowing the passage of the spectrally broad Thomson scattered light. An ASE filter was developed to obtain a high spectral purity for the laser (pulsed Ti-Sapphire at 780 nm) employed in this study. Successful experiments were performed to detect the Thomson signal which was obtained from an atmospheric pressure argon plasma. Information on the electron number density and the electron temperature was derived from the Thomson signal by fitting a model curve to the data. The measurement results gave an electron temperature of 0.82 0.06 eV, an electron number density of 1.611016 0.05 1016electrons/cm3.
