The possibility of determining the plasma electron temperature by measuring the depolarization of the radiation scattered by the high temperature fusion reactor plasma is explored in this article. A numerical calculation based on the theory of the article [Sov. J. Plasma Phys. 7, 669 (1981)] in the case of 90° scattering, with the incident radiation linearly polarized and the polarization plane at 45° with respect to the scattering plane, is carried out. The result is that there is a one to one relationship between plasma electron temperature and depolarization, being independent from the detection wavelength. As an example electron density and temperature of 1020m-3and 20 keV, respectively, are taken, a wavelength and energy of the incident radiation pulse of 1064 nm and 8 J, respectively, and for a wavelength detection range of 1050-660 nm, a depolarization value of 0.19 and an estimated error on it of 1.7% are found, if the scattering volume is 2 cm long and the collection solid angle is 7.85×10-3sr. A prototype of the diagnostic apparatus based on beamsplitting Thompson prism is proposed. © 1999 American Institute of Physics.
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