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Vacuum UV spectroscopy and impurity behavior in tokamak and stellarator plasmas

R.C Isler1997年Fusion Engineering and DesignIF 1.7出版社

AbstractAn overview of applications of vacuum UV (VUV) spectroscopy to studies of fusion plasmas is presented. This spectral region is usually considered to extend from 10 to 2000 Å. Most impurity studies in core plasmas and in divertors rely on measuring the intensities of the bright resonance lines that lie in this wavelength range. In the core, these data are supplemented by emissions from charge exchange excitation to determine concentrations of fully stripped low-Z ions. Determinations of individual impurity radiative losses and densities are carried out with the aid of one-dimensional codes in which transport coefficients are adjusted until the modelled intensities are well matched to experimental observation. Analysis of divertor spectra presents special difficulties, because of the inherently two-or three-dimensional nature of the radiation patterns. In addition to impurity studies, VUV lines are used to determine electron and ion temperatures, and plasma rotation.

日本語訳

真空紫外(VUV)分光法の核融合プラズマ研究への応用について概説する。このスペクトル領域は通常、10〜2000 Åに及ぶとみなされている。コアプラズマおよびダイバータにおける不純物研究のほとんどは、この波長範囲に存在する明るい共鳴線の強度測定に依存している。コア領域では、これらのデータは電荷交換励起からの放射によって補完され、完全電離した低Zイオンの密度が決定される。個々の不純物の放射損失と密度の決定は、輸送係数を調整してモデル化された強度が実験観測と一致するようにした一次元コードを用いて行われる。ダイバータスペクトルの解析は、放射パターンが本質的に二次元または三次元であるため、特別な困難を伴う。不純物研究に加えて、VUV輝線は電子温度・イオン温度およびプラズマ回転の決定にも用いられる。

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