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Gyrokinetic modelling of electron and boron density profiles of H-mode plasmas in ASDEX Upgrade

C. Angioni, R.M. McDermott, E. Fable, R. Fischer, T. Pütterich, F. Ryter, G. Tardini, the ASDEX Upgrade Team2011年被引用 77Nuclear FusionIF 3出版社

Local gyrokinetic calculations of the logarithmic gradients at mid-radius of both electron and boron densities in ASDEX Upgrade H-mode plasmas are presented and compared with the experimental observations. The experimental results show that both the electron and the boron density profiles increase their peaking in response to the addition of central electron cyclotron heating over a background of neutral beam injection (NBI) heating. The boron density profiles are always less peaked than the electron density profiles in the confinement region, and are flat or even slightly hollow in the presence of NBI heating only. The experimental behaviours are well reproduced by the theoretical predictions. The agreement allows the identification, through theoretical modelling, of the transport mechanisms responsible for the observed dependences. In particular, the observed increase in the logarithmic electron density gradient with increasing central electron heating is explained by a concurrent reduction of the outward pure convection and an increase in the inward thermodiffusion. In addition, it is found that the plasma toroidal rotation velocity and its radial gradient play a non-negligible role in the turbulent boron transport, and allow the prediction of a decrease in boron peaking with increasing rotation velocity, which is consistent with the experimental observations.

日本語訳

局所ジャイロ運動論的計算による、ASDEX Upgrade Hモードプラズマにおける中間半径での電子密度とホウ素密度の対数勾配を提示し、実験観測と比較する。実験結果は、中性粒子ビーム入射(NBI)加熱を背景とした中心電子サイクロトロン加熱の追加に応じて、電子密度とホウ素密度の両方のプロファイルのピーキングが増加することを示している。閉じ込め領域では、ホウ素密度プロファイルは常に電子密度プロファイルよりもピーキングが小さく、NBI加熱のみの場合には平坦またはわずかに中空となる。実験的な挙動は理論的予測によってよく再現される。この一致により、理論的モデリングを通じて、観測された依存性の原因となる輸送機構を特定することが可能となる。特に、中心電子加熱の増加に伴う電子密度の対数勾配の増加は、外向きの純対流の減少と内向きの熱拡散の増加が同時に生じることによって説明される。さらに、プラズマのトロイダル回転速度とその動径勾配が、乱流ホウ素輸送において無視できない役割を果たし、回転速度の増加に伴うホウ素ピーキングの減少を予測可能にし、これは実験観測と一致する。

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