We theoretically assess two mechanisms thought to be responsible for the enhanced performance observed in plasma discharges of the Wendelstein 7-X stellarator experiment fueled by pellet injection. The effects of the ambipolar radial electric field and the electron density peaking on the turbulent ion heat transport are separately evaluated using large-scale gyrokinetic simulations. The essential role of the stellarator magnetic geometry is demonstrated, by comparison with a tokamak.

中文翻译：

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增强性能的恒星等离子的湍流机理。

从理论上讲，我们评估了两种机制，这些机制被认为是由颗粒注入助燃的Wendelstein 7-X恒星发生器实验的等离子体放电中观察到的性能增强的原因。使用大规模的陀螺动力学模拟分别评估了双极性径向电场和电子密度峰值对湍流离子传热的影响。通过与托卡马克比较，证明了恒星几何形状的基本作用。