Impurity Transport and Its Application to Ion Temperature Measurement in JT-60U Divertor Plasmas

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The ratio of population densities of C^<3+> excited levels, C^<3+>(3p^2P_<3/2>), C^<3+>(n=6), and C^<3+>(n=7), indicates that C^<3+>(n=7) is predominantly excited by electron collision with the ground state of C^<3+> in attached plasmas. Hence, Doppler broadening of the C IV (n=6-7) spectral line provides C^<3+> temperature. Regression analysis of the spectrum results in two C^<3+> temperature components. The higher C^<3+> temperature ranges from 50eV to 150eV, the lower around 20eV. From the results of the analyses with plasma and impurity transport codes and a collisional-radiative model, the higher and the lower C^<3+> temperature correspond to the C^<3+> temperature of the common flux (divertor) plasma and of the private plasma, respectively. In the inner divertor, C^<3+> temperature is close to D^+ temperature, and the C IV spectral line is predominantly emitted around the inner divertor leg. Therefore, it is concluded that D^+ temperature around the inner divertor leg can be measured from the C IV spectral line. On the contrary, it is found difficult to measure the D^+ temperature in the outer divertor.
社団法人プラズマ・核融合学会の論文
2004-06-25