论文标题
在激光Wakefield加速器中，同轴激光干扰引起的注射
Injection induced by coaxial laser interference in laser wakefield accelerators
论文作者
论文摘要
提出了一种使用两种同轴激光脉冲干扰的新注射方案，以在激光韦克赛场加速器中产生高质量的光束。在此方案中，相对较松散的激光脉冲驱动了血浆韦克场，并且具有相似强度触发干扰环模式的紧密聚焦的激光脉冲，在等离子体韦克菲尔德中产生了洋葱样的多鞘。由于紧密焦点激光的焦点位置后的波前曲率变化，韦克菲尔德的最内向鞘膨胀，这减慢了韦克菲尔德的有效相速度，并触发了血浆电子的注入。粒子中的粒子模拟表明，可以使用中度激光参数可以同时生成具有低能量扩散（每磨），高电荷（一百个picocoulomb）和小发射率（一百毫米毫米毫米）的高质量电子束（一百个picocoulomb）和小发射率（亚毫米毫米），以在两个激光器之间适当选择的相位差异。
A new injection scheme using the interference of two coaxial laser pulses is proposed for generating high quality beams in laser wakefield accelerators. In this scheme, a relatively loosely focused laser pulse drives the plasma wakefield, and a tightly focused laser pulse with similar intensity triggers interference ring pattern which creates onion-like multi sheaths in the plasma wakefield. Due to the wavefront curvature change after the focal position of the tightly focused laser, the innermost sheath of the wakefield expands, which slows down the effective phase velocity of the wakefield and triggers injection of plasma electrons. Particle-in-cell simulations show that high quality electron beams with low energy spread (a few per mill), high charge (hundred picocoulomb) and small emittance (sub millimeter milliradian) at the same time can be generated using moderate laser parameters for properly chosen phase differences between the two lasers.
