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Geometrical effects on drift wave stability in low shear stellarator plasmas

机译：低切变恒星等离子体中漂移波稳定性的几何效应

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摘要

Modem stellarators are designed with neoclassical transport in mind, potentially leading to anomalous transport originating from drift wave turbulence as the primary cause of energy and particle losses. It is therefore of interest to consider the influence of details of geometry on drift wave stability. In this paper the eigenvalue drift wave equation is therefore solved numerically in fully three-dimensional stellarator geometries using the ballooning mode formalism. The correlation between the details of the configurations such as local magnetic shear (LMS), normal curvature, geodesic curvature and magnetic field strength and the drift wave spectrum is discussed for two different stellarator configurations. A detailed discussion of the localization of the most unstable modes is presented and analysed. It is found that the most unstable modes are localized where the stabilizing effect of integrated LMS is minimum or where the coupling between the integrated LMS and geodesic curvature is strong. Since the more the modes are localized the stronger they will be influenced by the local geometrical effects, the most unstable modes are also highly localized.
机译：现代恒星的设计考虑了新古典主义的运输，可能导致由漂移波湍流引起的运输异常，这是能量和颗粒损失的主要原因。因此，有必要考虑几何细节对漂移波稳定性的影响。因此，在本文中，使用膨胀模态形式，在完全三维恒星几何中对特征值漂移波方程进行了数值求解。针对两种不同的恒星器配置，讨论了配置细节（例如局部磁剪切（LMS），法向曲率，测地曲率和磁场强度）与漂移波谱之间的相关性。提出并分析了最不稳定模式的定位的详细讨论。发现最不稳定的模式位于集成LMS的稳定效果最小或集成LMS与测地曲率之间的耦合较强的地方。由于模式被定位的越多，它们将受到局部几何效应的影响越大，因此最不稳定的模式也被高度定位。

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