The simulation of 1D two stream instability based on simultaneous numerical solution of Poisson and
Vlasov equations using Cheng-Knorr-Sonnerdrucker method
Find more information about numerical method and the example below in the original paper - C.Z. Cheng and Georg Knorr "The Integration of the Vlasov Equation in Configuration Space" // J. Comp. Phys. 22 (1976)
pp. 330-351 (DOI: 10.1016/0021-9991(76)90053-X) and its former improvement given in E. Sonnendrücker,
J. Roche, P. Bertrand, and A. Ghizzo "The Semi-Lagrangian Method for the Numerical Resolution of the Vlasov Equation" // J. Comput. Phys. 149 (1999) pp. 201-220 (DOI: 10.1006/jcph.1998.6148)