Particle simulation on electron acceleration process by the laser ponderomotive force in inhomogeneous underdense plasma layers
Cao Li-Hua (曹莉华)a, Yu Wei (余玮)b, Xu Han (徐涵)b, Liu Zhan-Jun (刘占军)a, Zheng Chun-Yang (郑春阳)a, Li Bin (李斌)a
a Institute of Applied Physics and Computational Mathematics, Beijing 100088, China; b Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China
Abstract The mechanism of electron ponderomotive acceleration due to increasing group velocity of laser pulse in inhomogeneous underdense plasma layers is studied by two-dimensional relativistic parallel particle-in-cell code. The electrons within the laser pulse move with it and can be strongly accelerated ponderomotively when the duration of laser pulse is much shorter than the duration of optimum condition for acceleration in the wake. The extra energy gain can be attributed to the change of laser group velocity. More high energy electrons are generated in the plasma layer with descending density profile than that with ascending density profile. The process and character of electron acceleration in three kinds of underdense plasma layers are presented and compared.
Received: 08 October 2003
Revised: 18 November 2003
Accepted manuscript online:
Fund: Project supported by the National High Technology ICF Committee of China and the National Natural Science Foundation of China (Grant Nos 10335020,10375011).
Cite this article:
Cao Li-Hua (曹莉华), Yu Wei (余玮), Xu Han (徐涵), Liu Zhan-Jun (刘占军), Zheng Chun-Yang (郑春阳), Li Bin (李斌) Particle simulation on electron acceleration process by the laser ponderomotive force in inhomogeneous underdense plasma layers 2004 Chinese Physics 13 1302
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