论文标题
使用基于力矩的方法和高级碰撞算子在Z pinch中对等离子体湍流的陀螺仪模拟
Gyrokinetic simulations of plasma turbulence in a Z-pinch using a moment based approach and advanced collision operators
论文作者
论文摘要
介绍了使用矩方法获得的第一个非线性陀螺仪模拟，根据分布函数的Hermite-Laguerre分解，为碰撞运算符实现了高级模型。 \ modif {二维} Z-PINCH中的湍流被考虑在通量管配置中。在无碰撞状态中，我们的旋转态度方法与与连续旋转代码基因进行的非线性模拟相吻合，即使旋转率较少，却少于线性增长速率的收敛。通过使用高级线性碰撞算子，然后分析碰撞在设置湍流水平中的作用。碰撞算子模型的选择被证明是在存在区域流的存在时会产生关键的影响。当包括碰撞时，旋息态方法的收敛特性会改善。
The first nonlinear gyrokinetic simulations obtained using a moment approach based on the Hermite-Laguerre decomposition of the distribution function are presented, implementing advanced models for the collision operator. Turbulence in a \modif{two-dimensional} Z-pinch is considered within a flux tube configuration. In the collisionless regime, our gyromoment approach shows very good agreement with nonlinear simulations carried out with the continuum gyrokinetic code GENE, even with fewer gyromoments than required for the convergence of the linear growth rate. By using advanced linear collision operators, the role of collisions in setting the level of turbulent transport is then analyzed. The choice of collision operator model is shown to have a crucial impact when turbulence is quenched by the presence of zonal flows. The convergence properties of the gyromoment approach improve when collisions are included.
