Energetic Laser-Ion Acceleration by Strong Charge-Separation Field  

作　　者：黄永盛 王乃彦 施义晋 汤秀章 毕远杰 高喆 

机构地区：[1]China Institute of Atomic Energy [2]Department of Engineering Physics,Tsinghua University

出　　处：《Plasma Science and Technology》2010年第3期268-276,共9页等离子体科学和技术（英文版）

基　　金：supported by the Key Project of Chinese National Programs for Fundamental Research (973 Program) (No.2006CB806004);National Natural Science Foundation of China (No.10834008)

摘　　要：The laser-ion acceleration from the ultra-short and ultra-intense laser-matter interactions attracts more and more interest nowadays. When a laser pulse interacts with a target, relativistic electrons are generated in a period of few femtoseconds and driven away by the ponderomotive force, then a huge charge-separation field forms. In general cases, the ion acceleration is determined by this charge-separation field and the scale length of the plasma density. A general time-dependent solution is obtained to describe laser-plasma isothermal expansions into a vacuum, which is the fundamental theory of the laser-ion acceleration. It is adequate for non-quasi-neutral plasmas and different types of the scale length of the density gradient. The previous solutions are some special cases of our general solution. It is found that there exist both a compression layer of the ion velocity distribution and a potential well for sorue initial conditions. However, many unaccounted idiographic solutions, which may be used to reveal new mechanisms of ion acceleration, may be deduced from our general solutions.The laser-ion acceleration from the ultra-short and ultra-intense laser-matter interactions attracts more and more interest nowadays. When a laser pulse interacts with a target, relativistic electrons are generated in a period of few femtoseconds and driven away by the ponderomotive force, then a huge charge-separation field forms. In general cases, the ion acceleration is determined by this charge-separation field and the scale length of the plasma density. A general time-dependent solution is obtained to describe laser-plasma isothermal expansions into a vacuum, which is the fundamental theory of the laser-ion acceleration. It is adequate for non-quasi-neutral plasmas and different types of the scale length of the density gradient. The previous solutions are some special cases of our general solution. It is found that there exist both a compression layer of the ion velocity distribution and a potential well for sorue initial conditions. However, many unaccounted idiographic solutions, which may be used to reveal new mechanisms of ion acceleration, may be deduced from our general solutions.

关 键 词：laser-ion acceleration ultra-short and ultra intense charge separation field compression layer potential well 

分 类 号：TN24[电子电信—物理电子学]