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Experimental confirmation of efficient island divertor operation and successful neoclassical transport optimization in Wendelstein 7-X

Thomas Sunn Pedersen, I. Abramovic, P. Agostinetti, M. Agredano Torres, S. Äkäslompolo, J. Alcuson Belloso, P. Aleynikov, K. Aleynikova, M. Alhashimi, A. Ali2022年被引用 28Nuclear FusionIF 3出版社

We present recent highlights from the most recent operation phases of Wendelstein 7-X, the most advanced stellarator in the world. Stable detachment with good particle exhaust, low impurity content, and energy confinement times exceeding 100 ms, have been maintained for tens of seconds. Pellet fueling allows for plasma phases with reduced ion-temperature-gradient turbulence, and during such phases, the overall confinement is so good (energy confinement times often exceeding 200 ms) that the attained density and temperature profiles would not have been possible in less optimized devices, since they would have had neoclassical transport losses exceeding the heating applied in W7-X. This provides proof that the reduction of neoclassical transport through magnetic field optimization is successful. W7-X plasmas generally show good impurity screening and high plasma purity, but there is evidence of longer impurity confinement times during turbulence-suppressed phases.

日本語訳

我々は、世界で最も先進的なステラレーターであるWendelstein 7-Xの最近の運転フェーズにおける最新のハイライトを提示する。安定したデタッチメントと、優れた粒子排気、低不純物含有量、および100ミリ秒を超えるエネルギー閉じ込め時間が、数十秒にわたって維持された。ペレット入射により、イオン温度勾配乱流が低減したプラズマ位相が可能となり、そのような位相中、全体の閉じ込めは非常に優れており(エネルギー閉じ込め時間はしばしば200ミリ秒を超える)、達成された密度および温度分布は、最適化されていない装置では不可能であったであろう。なぜなら、それらの装置では、Wendelstein 7-Xに投入された加熱出力を超える新古典輸送損失が生じたであろうからである。これは、磁場最適化による新古典輸送の低減が成功していることの証明となる。Wendelstein 7-Xのプラズマは一般に優れた不純物遮蔽と高いプラズマ純度を示すが、乱流抑制位相中には不純物閉じ込め時間が長くなるという証拠も見られる。

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wendelstein-7x高精度(タイトル一致)

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DivertorWendelsteinNeoclassical transportIsland divertor
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