Generation and Acceleration of GeVelectrons using Ultra-intense Laser

本课题的目的是利用超强激光在气体射流等离子体中激发出大振幅自调制韦克菲尔德场，然后将电子加速到100 MeV以上，从而建立了一套超强激光系统和气体射流系统，在0.4ps的脉宽下对靶输出能量为18焦耳，我们还研制了一台激光同步脉冲功率机，在1.2ns的抖动内，可以获得1.1- 2.6MeV的电子与YAG激光同步;将超强激光注入到气体射流等离子体中，观察到了前向拉曼散射和侧向散射。从这些信号中，我们估计等离子体波的振幅为35%的密度扰动和纵向场为100 GV/m。数据表明电子加速超过100 MeV。现在我们正在使用磁分析电子谱仪测量加速电子的能谱。

The purpose of this project is to excite large amplitude self-modulated wakefield in a gas jet plasma using an ultra-intense laser and then to accelerate electrons to more than 100 MeV.So that we have constructed an ultra- intense laser system and gas jet system.We now deliver 18 Joule on target energy in 0.4ps pulse width, leading to 6x 1018W/cm^2.We also developed a laser-synchronized pulse power machine, from which we can get 1.1-2.6 MeV electrons synchronized to A YAG laser within 1.2ns jittel ;By injecting the Ultra-intense laser into the gas jet plasma, we observed both the forward Raman scattering and the side scattering. From these signals, we estimated that the amplitude of the plasma wave is 35% in density perturbation and the longitudinal field is lOOGV/m. The data suggests the electron acceleration to more than 100 MeV.Now we are measuring the energy spectrum of the accelerated electrons using a magnetically analyzing electron spectrometer.