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A numerical simulation of the L-H transition in JET with local and global models of anomalous transport

J.G. Cordey, D.G. Muir, S.V. Neudachin, V.V. Parail, E. Springmann, A. Taroni1995年被引用 53Nuclear FusionIF 3出版社

A numerical study of the dynamics of the L-H transition in JET was done using models of anomalous transport which depend either on local or on global plasma parameters. Comparison with experimental results shows that the best agreement is reached when using a global model for reducing χe, χi and D in the region where shear becomes large (e.g., outside the q=1 surface). Thus the L-H transition manifests itself as a sudden drop of the transport coefficients everywhere outside the q=1 surface, not only in a narrow layer near the plasma edge. The slow improvement of plasma confinement which follows such a fast transition could then be attributed to the dependence on the local plasma parameters of the transport coefficients in the plasma core

日本語訳

JETにおけるL-H遷移の動力学の数値研究を、局所または全体のプラズマパラメータに依存する異常輸送モデルを用いて行った。実験結果との比較により、せん断が大きくなる領域(例えば、q=1面の外側)においてχe、χi、Dを低減する際に全体モデルを用いた場合に最も良い一致が得られることが示された。したがって、L-H遷移は、q=1面の外側の全域における輸送係数の急激な低下として現れ、プラズマ端近傍の狭い層のみに限定されるわけではない。このような高速遷移に続くプラズマ閉じ込めの緩やかな改善は、プラズマコアにおける輸送係数の局所プラズマパラメータへの依存性に帰属できる。

装置

jet高精度(タイトル一致)

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JETL-H transitionAnomalous transport
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