Ion dynamics in laser-produced collisionless perpendicular shock: one-dimensional particle-in-cell simulation  

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)

机构地区：[1]Deep Space Exploration Laboratory,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,People's Republic of China [2]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 [3]Collaborative Innovation Center of Astronautical Science and Technology,Harbin 150006,People's Republic of China [4]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

出　　处：《Plasma Science and Technology》2023年第6期23-29,共7页等离子体科学和技术（英文版）

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)。

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.

关 键 词：collisionless shock laser plasma ion acceleration 

分 类 号：TN24[电子电信—物理电子学] O53[理学—等离子体物理]