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Profile control experiments in JET using off-axis lower hybrid current drive

A. Ekedahl, Yu.F. Baranov, J.A. Dobbing, B. Fischer, C. Gormezano, T.T.C. Jones, M. Lennholm, V.V. Parail, F.G. Rimini, J.A. Romero1998年被引用 44Nuclear FusionIF 3出版社

In lower hybrid current drive (LHCD) experiments in JET, up to 7.3 MW of lower hybrid (LH) power has been coupled to X point plasmas, resulting in sawtooth suppression and full current drive up to 3 MA. The current drive efficiency reached ηCD = 0.26 × 1020 m-2·A/W in these experiments. The LH power deposition and driven current profiles can be quite well reproduced with the ray tracing and Fokker-Planck code in JET, even when multipass absorption of the LH wave is dominant. Profile control with off-axis LHCD has been used for increasing q above 1, thereby suppressing sawteeth before the edge localized mode (ELM)-free hot ion H mode. In optimized shear plasmas, a broad q profile with central negative shear was formed with moderate LH power (∼2 MW), applied in the low density phase during the current rampup. An internal transport barrier with improved electron confinement was produced, which resulted in a peaking of the electron temperature profile and Te0 up to 10 keV at ne0 ⩽ 1.5 × 1019 m-3.

日本語訳

JETにおける低混成波電流駆動(LHCD)実験では、最大7.3 MWの低混成波(LH)パワーがX点プラズマに結合され、その結果、鋸歯状振動の抑制と最大3 MAの完全電流駆動が達成された。これらの実験における電流駆動効率はηCD = 0.26 × 10^20 m^-2・A/Wに達した。LHパワーの堆積および駆動電流分布は、LH波の多重吸収が支配的である場合でも、JETにおける光線追跡およびフォッカー・プランクコードによって極めて良好に再現できる。オフアクシスLHCDを用いた分布制御は、qを1以上に増加させるために使用され、これによりELMフリーの高温イオンモードの前に鋸歯状振動を抑制した。最適化されたシアプラズマでは、電流ランプアップ中の低密度相において約2 MWの適度なLHパワーを印加することにより、中心部で負のシアを有する広いq分布が形成された。これにより内部輸送障壁が生成され、電子閉じ込めが改善され、その結果、ne0 ≤ 1.5 × 10^19 m^-3において電子温度分布のピーキングとTe0の最大10 keVへの上昇がもたらされた。

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jet高精度(タイトル一致)

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JETCurrent driveLower hybridLower hybrid current drive
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