摘要
Recently, perpendicular shocks have been generated in laboratory experiments by the interaction between a laser-produced supersonic plasma flow and a magnetized ambient plasma. Here, we explore the ion dynamics and the formation of such kinds of shock with a one-dimensional(1D)particle-in-cell simulation model using achievable parameters for laser experiments. A small part of the ambient ions is first reflected by the laser-driven piston. These piston-reflected ions interact with the upstream plasma and form a shock then. By analyzing the contribution of the electric force and the Lorentz force during the reflection, shock-reflected ions are found to be accelerated by two different mechanisms: shock drift acceleration and shock surfing acceleration,where shock drift acceleration is the dominant one. Very few ions are reflected twice by the shock and accelerated to a large velocity, implying that a more energetic population of ions can be observed in future experiments.
作者
郭奥
唐桧波
任俊屹
胡广月
卢三
Ao GUO;Huibo TANG;Junyi REN;Guangyue HU;San LU(Deep Space Exploration Laboratory,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,People's Republic of China;CAS Center for Excellence in Comparative Planetology,CAS Key Laboratory of Geospace Environment,University of Science and Technology of China,Hefei 230026,People's Republic of China;Collaborative Innovation Center of Astronautical Science and Technology,Harbin 150006,People's Republic of China;CAS Key Laboratory of Geospace Environment,School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,People's Republic of China)
基金
funded by the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDB41000000)
National Natural Science Foundation of China(NSFC)(Nos. 42174181 ,12205298)
the Key Research Program of Frontier Sciences CAS (No. QYZDJ-SSWDQC010)。
