论文标题
激光驱动器的飞秒尺度时间结构对Wakefield加速电子产生的Betatron辐射的影响
Effect of a femtosecond-scale temporal structure of a laser driver on generation of betatron radiation by wakefield accelerated electrons
论文作者
论文摘要
激光Wakefield加速电子产生的BETATRON辐射的亮度可以通过在相同能量下使用持续时间较短的激光驱动器来提高。脉冲压缩在薄板中的非线性自相度调制后，可以通过脉冲压缩来进行这种缩短。但是，此方法可以导致脉冲的飞秒时间结构相当复杂。在这项工作中，数值模拟的结果表明，含有较少或更多主脉冲能量的基座或预卵形的存在可以抑制加速过程，并导致加速电子和生成的光子的能量较低。同时，在最佳距离下主脉冲跟随主脉冲的相对较长而强烈的延迟存在可以增强电子的振荡并增加贝塔龙辐射的亮度。
A brightness of a betatron radiation generated by laser wakefield accelerated electrons can be increased by utilizing the laser driver with shorter duration at the same energy. Such shortening is possible by pulse compression after its nonlinear self-phase modulation in thin plate. However, this method can lead to a rather complex femtosecond-scale time structure of the pulse. In this work, the results of numerical simulations show that the presence of a pedestal or prepulses containing few percents or more of the main pulse energy can inhibit the acceleration process and lead to lower energies of accelerated electrons and generated photons. Simultaneously, the presence of a relatively long and intense postpulse following the main pulse at optimal distance can enhance the oscillations of accelerating electrons and increase the brightness of betatron radiation.
