We revisit the contour dynamics (CD) simulation method which is applicable to large deformation of distribution function in the Vlasov-Poisson plasma with the periodic boundary, where contours of distribution function are traced without using spatial grids. Novelty of this study lies in application of CD to the one-dimensional Vlasov-Poisson plasma with the periodic boundary condition. A major difficulty in application of the periodic boundary is how to deal with contours when they cross the boundaries. It has been overcome by virtue of a periodic Green's function, which effectively introduces the periodic boundary condition without cutting nor reallocating the contours. The simulation results are confirmed by comparing with an analytical solution for the piece-wise constant distribution function in the linear regime and a linear analysis of the Landau damping. Also, particle trapping by Langmuir wave is successfully reproduced in the nonlinear regime.
Structure preservation using discrete gradients in the Vlasov-Poisson-Landau system
National Research Council, Naval Research Laboratory（国家研究委员会，海军研究实验室）；University at Buffalo, The State University of New York（纽约州立大学布法罗分校）；Lawrence Berkeley National Laboratory（劳伦斯伯克利国家实验室）
Confined steady states of a Vlasov-Poisson plasma in an infinitely long cylinder
我们考虑二维Vlasov-Poisson系统来模拟一个在第三空间维度上分布函数为常数的双组分等离子体。首先，我们展示了这个二维的Vlasov-Poisson系统是如何从完整的三维系统导出的。在三维环境中，电势为零的紧支撑定态的存在性已经由A. L. Skubachevskii [15].我们表明，他的方法可以很容易地适应于二维系统。然而，我们的主要结果是证明即使具有非平凡的自洽电势，也存在紧支撑稳态。
