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Demonstration of in-situ relative calibration method for a Thomson scattering diagnostic on TST-2

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

This paper presents experimental demonstrations of an in-situ calibration method for Thomson scattering diagnostics in the TST-2 spherical tokamak. Electron temperature $$T_{rm e,c}$$ from this new method shows a good agreement with $$T_{rm e,2}$$ from the single (second) pass within $$langle |T_{rm e,c}-T_{rm e,2}|/T_{rm e,2}rangle = 3.7%$$ for a wide $$T_{rm e}$$ range (100-400 eV). Relative sensitivities among spectral channels can be then obtained from $$T_{rm e,c}$$ without accessing to the machines. Although some deviations are observed in a spectral channel, the sensitivities from this new method tend to correspond to the true (directly measured) values within $$sim$$ 5%, providing a feasibility of application to Thomson scattering diagnostics in severe radiation condition.

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