Development of advanced linearized gyrokinetic collision operators using a moment approach
Development of advanced linearized gyrokinetic collision operators using a moment approach
复制标题
使用力矩方法开发先进的线性回旋碰撞算子
DOI：
10.1017/s0022377821000830
复制
发表时间：
2021
影响因子：
2.5
通讯作者：
L. Stenger
中科院分区：
文献类型：
--
作者：
B. J. Frei;J. Ball;Antoine C.D. Hoffmann;R. Jorge;P. Ricci;L. Stenger
推导和数值实现的线性版本的回旋（GK）库仑碰撞算子（豪尔赫等人，等离子体物理学杂志，85，2019，905850604）和广泛使用的线性GK Sugama碰撞算子（Sugama等人，等离子体，第16卷，2009，112503）。一种基于厄米-拉盖尔矩展开的扰动gyrocentre分布函数的方法被使用，称为gyromoment展开。这种方法允许考虑任意的垂直波数和表示的两个线性GK运营商作为一个线性组合的陀螺力矩的膨胀系数由封闭的解析表达式，取决于垂直波数和碰撞物种的温度和质量比。还得到了GK线性化的Coulomb算子和Sugama算子的漂移动力学（DK）极限。陀螺力矩的方法和DK库仑和GK Sugama运营商在连续GK代码GENE之间的比较报告，专注于离子温度梯度不稳定性和纬向流阻尼，找到一个很好的协议。已证实，与GK线性化库仑模型相比，Sugama GK模型的纬向流残余的碰撞阻尼更强（Pan等人，等离子体，第27卷，2020，042307）在较高的碰撞性下持续。最后，我们表明，陀螺力矩方法的数值效率增加与碰撞，边界等离子体应用程序所需的属性。
The derivation and numerical implementation of a linearized version of the gyrokinetic (GK) Coulomb collision operator (Jorge et al., J. Plasma Phys., vol. 85, 2019, 905850604) and of the widely used linearized GK Sugama collision operator (Sugama et al., Phys. Plasmas, vol. 16, 2009, 112503) is reported. An approach based on a Hermite–Laguerre moment expansion of the perturbed gyrocentre distribution function is used, referred to as gyromoment expansion. This approach allows the considering of arbitrary perpendicular wavenumber and expressing the two linearized GK operators as a linear combination of gyromoments where the expansion coefficients are given by closed analytical expressions that depend on the perpendicular wavenumber and on the temperature and mass ratios of the colliding species. The drift-kinetic (DK) limits of the GK linearized Coulomb and Sugama operators are also obtained. Comparisons between the gyromoment approach and the DK Coulomb and GK Sugama operators in the continuum GK code GENE are reported, focusing on the ion-temperature-gradient instability and zonal flow damping, finding an excellent agreement. It is confirmed that stronger collisional damping of the zonal flow residual by the Sugama GK model compared with the GK linearized Coulomb (Pan et al., Phys. Plasmas, vol. 27, 2020, 042307) persists at higher collisionality. Finally, we show that the numerical efficiency of the gyromoment approach increases with collisionality, a desired property for boundary plasma applications.
影响因子：
2.2
作者：
I. Abel;Michael Barnes;S. Cowley;W. Dorland;A. Schekochihin
通讯作者：
I. Abel;Michael Barnes;S. Cowley;W. Dorland;A. Schekochihin
影响因子：
6.3
作者：
Dudson, B. D.;Umansky, M. V.;Wilson, H. R.
通讯作者：
Wilson, H. R.