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First measurement of electron temperature from signal ratios in a double-pass Thomson scattering system

Tojo, Hiroshi; Ejiri, Akira*; Hiratsuka, Junichi*; Yamaguchi, Takashi*; Takase, Yuichi*; Itami, Kiyoshi; Hatae, Takaki

This paper presents a experimental demonstration to determine electron temperature ($$T_{rm e}$$) with unknown spectral sensitivity (transmissivity) in a Thomson scattering system. In this method, a double-pass scattering configuration is used and the scattered lights from each pass (with different scattering angles) are measured separately. $$T_{rm e}$$ can be determined from the ratio of the signal intensities without a real chromatic dependence in the sensitivity. This method was applied to the TST-2 Thomson scattering system. As a result, $$T_{rm e}$$ measured from the ratio ($$T_{rm e,r}$$) and $$T_{rm e}$$ measured from a standard method ($$T_{rm e,s}$$) showed a good agreement with $$langle |T_{rm e,r}-T_{rm e,s}|/T_{rm e,s} rangle$$= 7.3%.

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