A study of charge dependence of particle transport using impurity pellet injection and high-spatial resolution bremsstrahlung measurement on the Large Helical Device

• DOI: 10.1063/1.1695355
• Publication Date: 2004-04-29T00:48:41Z
• Authors: H. Nozato; S. Morita; M. Goto; Y. Takase; A. Ejiri; T. Amano; K. Tanaka; S. Inagaki
• Keywords: 0103 physical sciences; 01 natural sciences; 7. Clean energy

The spatial structure and Z dependence of transport coefficient were studied by injecting impurity pellets (C, Al, Ti) measuring high-spatial resolution bremsstrahlung in steady-state neutral beam heated plasmas on the Large Helical Device [A. Iiyoshi et al., Fusion Techol. 17, 169 (1990)]. D V evaluated from a diffusive/convective model with minimizing residual error between experimental computational intensities taking recycling rate into account. As result, existence an inward convection was observed at ρ>0.6, no required ρ<0.6. Furthermore, it is found that electron density, species charge state weak [typically D=0.15–0.25 (m2/s) range ne=1.4–5.2×1019 (m−3)], but has strong not only density also state. convective velocity for carbon titanium ions evaluated.