论文标题
通过关键梯度优化的准螺旋对称恒星量减少静电湍流
Reduction of electrostatic turbulence in a quasi-helically symmetric stellarator via critical gradient optimization
论文作者
论文摘要
我们提供了针对离子温度梯度（ITG）驱动模式的较大阈值（``关键梯度''）优化的恒星配置，该模式实现了我们在任何阳性剂中看到的最大的关键梯度。在此阈值之上，陀螺仪模拟表明，在实验相关的驱动强度范围内，构型的湍流水平较低。应用的优化旨在最大化漂移曲率，从而增强了环环ITG模式的局部剪切稳定和相关的湍流。这些好处与出色的准对称性结合在一起，产生低新古典的运输和消失的小α颗粒损失。对所得构型的分析表明，磁流失动力学（MHD）和ITG稳定性之间的权衡。
We present a stellarator configuration optimized for a large threshold (``critical gradient'') for the onset of the ion temperature gradient (ITG) driven mode, which achieves the largest critical gradient we have seen in any stellarator. Above this threshold, gyrokinetic simulations show that the configuration has low turbulence levels over an experimentally relevant range of the drive strength. The applied optimization seeks to maximize the drift curvature, leading to enhanced local-shear stabilization of toroidal ITG modes, and the associated turbulence. These benefits are combined with excellent quasisymmetry, yielding low neoclassical transport and vanishingly small alpha particle losses. Analysis of the resulting configuration suggests a trade-off between magnetohydrodynamic (MHD) and ITG stability.
