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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. Yamada1995年被引用 9Nuclear FusionIF 3出版社

Local atomic hydrogen densities inside plasmas of the Compact Helical System (CHS) were measured using laser induced fluorescence tuned to Hα, 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

日本語訳

コンパクトヘリカルシステム(CHS)のプラズマ内部の局所的な水素原子密度を、Hαに同調させたレーザー誘起蛍光法を用いて測定し、その結果を中性粒子シミュレーションコードを用いた計算結果と比較した。これにより、プラズマ周辺部からプラズマ内部への水素原子の侵入エネルギーを決定した。さらに、様々なトロイダル位置におけるCCDカメラおよび光電子増倍管を用いたHα発光強度の補助測定の結果から、プラズマ全体にわたる局所的な水素原子密度分布を得た。この水素原子密度分布から粒子源分布を評価し、その後、粒子連続の式を用いて動径方向の粒子フラックス分布を求めた。後者の推定誤差は、絶対値で±30%、分布形状で数パーセントであった。このようにして得られた動径方向の粒子フラックスは、粒子拡散係数および対流速度の評価に有用である。

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