论文标题
恒星中关键离子温度梯度的粗粒陀螺仪
Coarse-grained gyrokinetics for the critical ion temperature gradient in stellarators
论文作者
论文摘要
我们提出了一种修改的旋转理论，以预测确定恒星等离子体中离子温度梯度（ITG）模式线性发作的关键梯度。在局部最小值周围，将粗粒技术应用于漂移曲率，进入标准的陀螺仪方程。由于它的简单性，这种新型形式主义得出了对关键梯度的估计，其计算成本足够低，足以应用出色的优化。在与陀螺仪求解器进行比较时，我们的结果表明，对于各种恒星设计，我们的结果很好。在此处获得ITG驱动不稳定性发作的物理学的洞察力，使我们能够设计一种与Wendelstein 7-X设备相似的紧凑型配置，但几乎是ITG线性关键梯度的两倍，改进了非线性关键梯度，并降低了非线性关键梯度以上的ITG模式。
We present a modified gyrokinetic theory to predict the critical gradient that determines the linear onset of the ion temperature gradient (ITG) mode in stellarator plasmas. A coarse-graining technique is applied to the drift curvature, entering the standard gyrokinetic equations, around local minima. Thanks to its simplicity, this novel formalism yields an estimate for the critical gradient with a computational cost low enough for application to stellarator optimization. On comparing against a gyrokinetic solver, our results show good agreement for an assortment of stellarator designs. Insight gained here into the physics of the onset of the ITG driven instability enables us to devise a compact configuration, similar to the Wendelstein 7-X device, but with almost twice the ITG linear critical gradient, an improved nonlinear critical gradient, and reduced ITG mode transport above the nonlinear critical gradient.
