Electromagnetic Emission from Laser Wakefields in Magnetized Underdense Plasmas  

作　　者：胡志丹 盛政明 丁文君 王伟民 董全力 张杰 

机构地区：[1]Beijing National Laboratory of Condensed Matter Physics,Institute of Physics,CAS [2]Key Laboratory for Laser Plasmas(Ministry of Education)and Department of Physics,Shanghai Jiaotong University

出　　处：《Plasma Science and Technology》2012年第10期874-879,共6页等离子体科学和技术（英文版）

基　　金：supported in part by National Natural Science Foundation of China(Nos.10734130,10925421,11075105);the National Basic Research Program of China(Nos.2007CB310406,2009GB105002)

摘　　要：A wakefield driven by a short intense laser pulse in a perpendicularly magnetized underdense plasma is studied analytically and numerically for both weakly relativistic and highly relativistic situations. Owing to the DC magnetic field, a transverse component of the electric fields associated with the wakefield appears, while the longitudinal wave is not greatly affected by the magnetic field up to 22 Tesla. Moreover, the scaling law of the transverse field versus the longitudinal field is derived. One-dimensional particle-in-cell simulation results confirm the analytical results. Wakefield transmission through the plasma-vacuum boundary, where electromagnetic emission into vacuum occurs, is also investigated numerically. These results are useful for the generation of terahertz radiation and the diagnosis of laser wakefields.A wakefield driven by a short intense laser pulse in a perpendicularly magnetized underdense plasma is studied analytically and numerically for both weakly relativistic and highly relativistic situations. Owing to the DC magnetic field, a transverse component of the electric fields associated with the wakefield appears, while the longitudinal wave is not greatly affected by the magnetic field up to 22 Tesla. Moreover, the scaling law of the transverse field versus the longitudinal field is derived. One-dimensional particle-in-cell simulation results confirm the analytical results. Wakefield transmission through the plasma-vacuum boundary, where electromagnetic emission into vacuum occurs, is also investigated numerically. These results are useful for the generation of terahertz radiation and the diagnosis of laser wakefields.

关 键 词：laser wakefield magnetized plasma terahertz radiation particle-in-cell simulation 

分 类 号：TN248[电子电信—物理电子学]