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Iron transport in a confined high-temperature plasma

O. Demokan, F. Waelbroeck, N. Demokan1982年被引用 8Nuclear FusionIF 3出版社

The neoclassical flux of Fe XXIII is calculated, for the experimental conditions produced in PLT, by using the data on the iron density profiles and the plasma parameters. The flux of Fe XXIII is then evaluated from the continuity equation by using the same data and is found to be, on the average, two orders of magnitude larger than the neoclassical prediction and in the opposite direction. The expressions for purely anomalous trans-port coefficients are derived for this case. Furthermore, a sensitivity analysis is performed to investigate the dependence of the flux obtained from the continuity equation on the uncertainties in the rate coefficients and on some atomic processes not included in the calculations, such as auto-ionization and charge exchange. The dependence on the uncertainties in rate coefficients is found to be the critical one, since uncertainties of a factor of two could yield radially inward or outward fluxes, which are by orders of magnitude larger than the flux computed without uncertainty factors. Finally, linear programming techniques are applied to see if the flux calculated from the continuity equation could coincide with the neoclassical flux for any set of values of the rate coefficients within an uncertainty range of a factor of two. The results indicate that the deviation of the flux from the neoclassical values cannot be limited to a range smaller than ±12 times the neoclassical flux. The experimental accuracy needed in the impurity density measurements is also discussed.

日本語訳

Fe XXIII の新古典的フラックスは、PLT で生成された実験条件に対して、鉄密度分布とプラズマパラメータのデータを用いて計算される。次に、Fe XXIII のフラックスは、同じデータを用いて連続の式から評価され、平均的に、新古典的予測よりも2桁大きく、かつ逆方向であることが見出される。この場合に対して、純粋に異常な輸送係数の式が導出される。さらに、連続の式から得られたフラックスの、速度係数の不確かさおよび計算に含まれないいくつかの原子過程(例えば自動電離や電荷交換)への依存性を調べるために、感度解析が行われる。速度係数の不確かさへの依存性が決定的であることが見出される。なぜなら、2倍の不確かさは、不確かさ因子なしで計算されたフラックスよりも桁違いに大きい、半径方向内向きまたは外向きのフラックスをもたらし得るからである。最後に、連続の式から計算されたフラックスが、2倍の不確かさの範囲内での速度係数の任意の値の集合に対して新古典的フラックスと一致し得るかどうかを調べるために、線形計画法が適用される。結果は、フラックスの新古典的値からの偏差が、新古典的フラックスの±12倍よりも小さい範囲に制限され得ないことを示している。不純物密度測定に必要な実験精度についても議論される。

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