Vlasov gyrokinetic simulations of ion‐temperature‐gradient driven instabilities
Vlasov gyrokinetic simulations of ion‐temperature‐gradient driven instabilities
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离子温度梯度驱动不稳定性的弗拉索夫回旋模拟
DOI：
10.1063/1.871846
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
P. Bertrand
中科院分区：
文献类型：
--
作者：
G. Manfredi;M. Shoucri;R. Dendy;A. Ghizzo;P. Bertrand
给出了一个求解板几何中的陀螺运动Vlasov方程的欧拉程序。它考虑了E×B和极化在垂直于磁场的平面内的漂移，以及平行方向上的动力学效应。有限的拉莫尔半径是由卷积运算模拟的。建立了该模型与以前提出的模型之间的关系，并证明了它们在长波长和小拉莫尔半径的极限下是等价的。该代码适用于调查离子温度梯度模式在准中性制度，绝热电子。数值结果报告的参数范围很广，包括密度和温度分布，磁场强度，离子与电子的温度比。通常等离子体向长波长结构演化，尽管在某些情况下（当朗道阻尼非常弱时）观察到更强烈的湍流状态。测试粒子用于计算扩散系数在真实的空间和.
An Eulerian code that solves the gyrokinetic Vlasov equation in slab geometry is presented. It takes into account the E×B and polarization drifts in the plane perpendicular to the magnetic field, and kinetic effects in the parallel direction. The finite Larmor radius is modelled by a convolution operator. The relation is established between this model and others proposed previously, and they are shown to be equivalent in the limit of long wavelengths and small Larmor radii. The code is applied to investigate ion‐temperature‐gradient modes in the quasi‐neutral regime, with adiabatic electrons. Numerical results are reported for a wide range of parameters, including density and temperature profiles, magnetic field strength, and ion to electron temperature ratio. Normally the plasma evolves towards long wavelength structures, although in some cases (when Landau damping is very weak) more strongly turbulent regimes are observed. Test particles are used to compute diffusion coefficients both in real space and ...