Particle simulation on electron acceleration process by the laser ponderomotive force in inhomogeneous underdense plasma layers

doi:10.1088/1009-1963/13/8/021

中国物理B ›› 2004, Vol. 13 ›› Issue (8): 1302-1308.doi: 10.1088/1009-1963/13/8/021

Particle simulation on electron acceleration process by the laser ponderomotive force in inhomogeneous underdense plasma layers

曹莉华¹, 刘占军¹, 郑春阳¹, 李斌¹, 余玮², 徐涵²

(1)Institute of Applied Physics and Computational Mathematics, Beijing 100088, China; (2)Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China

收稿日期:2003-10-08 修回日期:2003-11-18 出版日期:2004-06-21 发布日期:2005-06-25
基金资助:
Project supported by the National High Technology ICF Committee of China and the National Natural Science Foundation of China (Grant Nos 10335020,10375011).

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

Received:2003-10-08 Revised:2003-11-18 Online:2004-06-21 Published:2005-06-25
Supported by:
Project supported by the National High Technology ICF Committee of China and the National Natural Science Foundation of China (Grant Nos 10335020,10375011).

摘要/Abstract

摘要： 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.

关键词: ponderomotive force, particle simulation, electron acceleration, inhomogeneous under-dense plasma layers

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.

Key words: ponderomotive force, particle simulation, electron acceleration, inhomogeneous under-dense plasma layers

中图分类号: (Particle-in-cell method)

52.65.Rr

52.38.Kd (Laser-plasma acceleration of electrons and ions) 52.25.-b (Plasma properties)

曹莉华, 余玮, 徐涵, 刘占军, 郑春阳, 李斌. Particle simulation on electron acceleration process by the laser ponderomotive force in inhomogeneous underdense plasma layers[J]. 中国物理B, 2004, 13(8): 1302-1308.

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[J]. Chinese Physics, 2004, 13(8): 1302-1308.

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Particle simulation on electron acceleration process by the laser ponderomotive force in inhomogeneous underdense plasma layers

Particle simulation on electron acceleration process by the laser ponderomotive force in inhomogeneous underdense plasma layers

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