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Transport in JET high performance plasmas

JET Team (prepared by V.V. Parail)1999年被引用 8Nuclear FusionIF 3出版社

Two types of high performance scenario have been produced in JET during the DTE1 campaign. One of them,the ELM free hot ion H mode scenario, which is well known and has been extensively used in the past, has two distinctregions: the plasma core and the edge transport barrier. The results obtained during the DTE1 campaign with D, DT andpure T plasmas confirm the JET Team's previous conclusion that the core transport scales as a gyro-Bohm in the inner half of the plasma volume, recovers its Bohm type nature closer to the separatrix and behaves as neoclassical ion transport in the transport barrier. Measurements on the top of the barrier suggest that the width of the barrier is dependent on isotope and that fast ions play a key role. The other high performance scenario is a relatively recently developed optimized magnetic shear scenario with small or slightly negative magnetic shear in the plasma core. Different mechanisms of internal transport barrier (ITB) formation were tested by predictive modelling and the results compared with experimentally observed phenomena. The observed non-penetration of heavyimpurities through the strong ITB, which contradicts a prediction of the conventional neoclassical theory, isdiscussed.

日本語訳

JETのDTE1キャンペーン中に、2つの高性能シナリオが生成された。その1つは、ELMフリーの高温イオンHモードシナリオであり、これは過去に広く使用され、よく知られているが、プラズマコアとエッジ輸送障壁の2つの明確な領域を持つ。DTE1キャンペーン中にD、DT、および純Tプラズマを用いて得られた結果は、JETチームの以前の結論を確認するものであり、コア輸送はプラズマ体積の内側半分ではジャイロボーム則に従ってスケーリングし、セパラトリックスに近づくにつれてボーム型の性質に回復し、輸送障壁内では新古典イオン輸送として振る舞う。障壁の頂上での測定は、障壁の幅が同位体に依存し、高速イオンが重要な役割を果たすことを示唆している。もう1つの高性能シナリオは、比較的最近開発された最適化磁気シナリオであり、プラズマコア内で小さな負の磁気シアを持つ。内部輸送障壁(ITB)の形成における異なるメカニズムが予測モデリングによって試験され、その結果は実験的に観測された現象と比較された。強いITBを通した重不純物の非浸透という観測結果は、従来の新古典理論の予測と矛盾するものであり、これについて議論する。

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