Evaluation of radial particle flux profile based on atomic hydrogen density measurements using laser induced fluorescence and emission at Halpha

H. Takenaga, T. Nakao, K. Uchino, K. Muraoka, M. Maeda, H. Iguchi, K. Ida, I. Yamada, S. Okamura, H. Yamada, S. Morita, C. Takahashi, K. Matsuoka

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Abstract

Local atomic hydrogen densities inside plasmas of the Compact Helical System (CHS) were measured using laser induced fluorescence tuned to H α, and the results were compared with those calculated using a neutral particle simulation code, in order to determine the penetration energy of hydrogen atoms from the chamber wall into the plasma. The results of these and supplementary measurements of Hα emission intensities using CCD cameras and photomultipliers at various toroidal positions yielded local atomic hydrogen density distributions throughout the whole plasma. The distribution of the particle source rate was evaluated from the atomic hydrogen distribution, and then the radial particle flux profile was obtained from a particle continuity equation. Estimated errors for the latter were ±30% at an absolute level and several per cent in the profile shape. The radial particle flux thus obtained is valuable for evaluations of particle diffusion coefficient and convection velocity.

Original languageEnglish
Article numberI09
Pages (from-to)107-111
Number of pages5
JournalNuclear Fusion
Volume35
Issue number1
DOIs
Publication statusPublished - Dec 1 1995

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Takenaga, H., Nakao, T., Uchino, K., Muraoka, K., Maeda, M., Iguchi, H., Ida, K., Yamada, I., Okamura, S., Yamada, H., Morita, S., Takahashi, C., & Matsuoka, K. (1995). Evaluation of radial particle flux profile based on atomic hydrogen density measurements using laser induced fluorescence and emission at Halpha. Nuclear Fusion, 35(1), 107-111. [I09]. https://doi.org/10.1088/0029-5515/35/1/I09