激光驱动的毛细管等离子体尾波特性

Characteristics of capillary plasma wake driven by laser pulse

基于激光等离子体尾波解析模型,分析了毛细管中激光与等离子体相互作用,数值计算了尾波中基本物理量。计算结果表明:毛细管等离子体尾波幅度与毛细管半径有关,在较小的毛细管中尾波幅度更大。在相同的激光与等离子体参数情况下,与无界等离子体尾波相比较,毛细管等离子体尾波中电子空泡纵向尺度、电场强度峰值、角向自生磁场强度峰值提高了60%,这些特征都表明毛细管等离子体尾波更有利于电子加速。

There is an important application for laser-driven plasma wakefield in electrons acceleration field.The idea of capillary plasma improving the effect of electron acceleration is put forward.Based on an analytical model of laser plasma wake,the interaction between laser and capillary plasma is investigated.It is shown that the amplitude of plasma wakefield in capillary is influenced by the radius of the capillary,and it rises with decreasing of the radius of capillary.With the same laser and plasma parameters,in capillary plasma these main physical quantities,such as the longitudinal scale of electron bubble,the peaks of electrostatic field and azimuthal magnetic field,increase 60%compared to that in unbound plasma.These results indicate that the plasma wake in capillary is in favor of electrons acceleration.