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Comparison of theory based transport models with ASDEX Upgrade data

G. Tardini, A.G. Peeters, G.V. Pereverzev, F. Ryter, J. Stober, ASDEX Upgrade Team2002年被引用 52Nuclear FusionIF 3出版社

Heat transport in steady state ASDEX Upgrade discharges is compared with the predictions of four theory based models: the IFS/PPPL, Weiland and GLF23 models, based on ion temperature gradient (ITG) and trapped electron mode physics, and the current diffusive ballooning mode (CDBM) model. The discharges selected provide scans over heating power, density and plasma current, by varying these quantities separately. The ion temperature profiles are found to be stiff, with the same linear relation between the core and edge temperatures for all the scans considered. The ITG based models reproduce this behaviour well qualitatively and quantitatively, while the CDBM model fails to predict profile stiffness. The electron temperature, however, does change shape when the density is lowered. All models reproduce this feature qualitatively. The stored energy is well predicted by the IFS/PPPL and Weiland models. The GLF23 model is less good, showing a clear trend to underpredict the energy at higher temperatures. The predictions made with the CDBM model are rather poor.

日本語訳

定常状態のASDEX Upgrade放電における熱輸送を、4つの理論モデル、すなわちイオン温度勾配(ITG)および捕捉電子モード物理に基づくIFS/PPPL、Weiland、GLF23モデルと、電流拡散バルーニングモード(CDBM)モデルの予測と比較した。選択した放電では、加熱パワー、密度、プラズマ電流をそれぞれ独立に変化させたスキャンを行った。イオン温度分布は剛直的であることが見出され、検討したすべてのスキャンにおいてコアとエッジの温度間に同じ線形関係が認められた。ITGに基づくモデルはこの挙動を定性的かつ定量的に良好に再現する一方、CDBMモデルは温度分布の剛直性を予測できない。しかし、電子温度は密度を低下させた場合に形状が変化する。すべてのモデルがこの特徴を定性的に再現する。蓄積エネルギーはIFS/PPPLおよびWeilandモデルによって良好に予測される。GLF23モデルはやや劣り、高温域でエネルギーを過小評価する明確な傾向を示す。CDBMモデルによる予測はかなり貧弱である。

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