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Direct measurement of the impurity radial flux in the FTU plasma core

D Pacella, L Gabellieri, G Mazzitelli, K B Fournier, M Finkenthal1997年Plasma Physics and Controlled FusionIF 2.2出版社

A direct measurement of the impurity radial flux in the FTU plasma core has been obtained by observation of soft x-ray spectra from highly ionized charge states of intrinsic molybdenum. This measurement has been performed using the equation of continuity for Mo31+ and the radial density profiles of Mo32+, Mo31+ and Mo30+. The profiles of these ions have been obtained by inversion of the measured signal along six different lines of sight in a series of reproducible discharges. Other ions, such as Fe and Ni, which emit in the VUV range, are also monitored at different chords and confirm the picture given by the soft x-ray measurements. A collisional - radiative model developed at LLNL and JHU allowed the reconstruction, from the spectra, of the radial profiles for the three molybdenum ions. The resulting flux shows that the transport is negligible (within the experimental errors) in the central region r < 10 cm, but is very rapid in the intermediate region 10 < r < 20 cm, and is more than one order of magnitude greater than the neoclassical prediction. Defining an effective `radial drift velocity' , it is found that has its maximum at half radius and there its value is about 0.4% of the thermal velocity.

日本語訳

プラズマコアにおける不純物の径方向フラックスの直接測定は、固有のモリブデンの高電離電荷状態からの軟X線スペクトルの観測によって得られた。この測定は、Mo31+の連続の式と、Mo32+、Mo31+、Mo30+の径方向密度分布を用いて行われた。これらのイオンの分布は、一連の再現性のある放電における6つの異なる視線に沿った信号の反転によって得られた。VUV領域で発光するFeやNiなどの他のイオンも、異なるコードで監視され、軟X線測定によって得られた像を確認した。LLNLとJHUで開発された衝突-放射モデルにより、スペクトルから3つのモリブデンイオンの径方向分布の再構築が可能となった。得られたフラックスは、中心領域(r < 10 cm)では輸送が無視できる程度(実験誤差内)であるが、中間領域(10 < r < 20 cm)では非常に速く、新古典論的予測よりも一桁以上大きいことを示している。有効な「径方向ドリフト速度」を定義すると、それは半半径で最大となり、その値は熱速度の約0.4%であることがわかった。

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