Experiments of generations of quasi-perpendicular collisionless shocks driven by laser plasma was performed at the Shenguang-II laser facility with intense lasers. Here, using a particle-in-cell simulation code including protons, carbon ions and electrons we investigate the experimental shock formation via the interaction between laser-ablated piston and ambient plasma magnetized by a large pre-existing magnetic field, and the associated ion dynamics in more detail. Simulation results show that, given enough time and space, ambient protons and carbon ions can be reflected at the piston-ambient interface successively, and that leads to the formation of corresponding shocks before the piston and interface. Electric fields associated with the initial interaction known as Larmor coupling and the shocks may accelerate the ambient protons, carbon ions reflected at the interface or shocks and piston ones transmitted to ambient region before the shock formation.

激波,激光等离子体