论文标题
在粒子中的粒子代码xgc中实现标记粒子和网格之间的高阶速度映射
Implementation of higher-order velocity mapping between marker particles and grid in the particle-in-cell code XGC
论文作者
论文摘要
用于研究磁融合等离子体中的运输的全局总计$ f $ gyrokinetic粒子中的粒子码XGC实现连续网格以执行耗散性操作，例如等离子体碰撞。为了在标记粒子和矩形速度空间网格之间传递分布函数，XGC采用了双线性映射。在这种双线性操作中，颗粒密度和动量的保护足够准确，但是在特殊条件下，粒子能量保护的误差可能会变得不可思议。在目前的工作中，我们根据伪内的计算来更新XGC以使用新颖的映射技术，以将矩恰好保留到离散空间的顺序上。我们通过使用$ 1^{\ Mathrm {st}} $ - 和$ 2^{\ Mathrm {nd}} $ - 与Pseudo Intrese Modedy and pseudo Intresse Moded and Bampapping bilitinear mupapping opterape the Neoclasical Tokamak测试用例的详细信息，并证明了新古典tokamak测试用例的插值误差。
The global total-$f$ gyrokinetic particle-in-cell code XGC, used to study transport in magnetic fusion plasmas, implements a continuum grid to perform the dissipative operations, such as plasma collisions. To transfer the distribution function between marker particles and a rectangular velocity-space grid, XGC employs a bilinear mapping. The conservation of particle density and momentum is accurate enough in this bilinear operation, but the error in the particle energy conservation can become undesirably large in special conditions. In the present work we update XGC to use a novel mapping technique, based on the calculation of a pseudo-inverse, to exactly preserve moments up to the order of the discretization space. We describe the details of the implementation and we demonstrate the reduced interpolation error for a neoclassical tokamak test case by using $1^{\mathrm{st}}$- and $2^{\mathrm{nd}}$-order elements with the pseudo-inverse method and comparing to the bilinear mapping.
