Stable and High-Quality Electron Beams from Staged Laser and Plasma Wakefield Accelerators
Stable and High-Quality Electron Beams from Staged Laser and Plasma Wakefield Accelerators
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DOI：
10.1103/physrevx.12.041016
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发表时间：
2022-11-10
影响因子：
12.5
通讯作者：
Karsch, S.
中科院分区：
文献类型：
--
作者：
Foerster, F. M.;Doepp, A.;Karsch, S.
本文介绍了激光韦克菲尔德加速器（LWFA）强流电子束驱动的等离子体韦克菲尔德加速器（PWFA）的实验结果。在此阶段设置稳定和高质量（低发散和低能量扩散）的电子束产生在PWFA中的光学产生的流体动力学冲击。在PWFA级中由该布置产生的光束的能量稳定性与单级激光加速器和由常规加速器驱动的等离子体韦克菲尔德加速器两者相当。模拟结果表明，PWFA对驱动器能量波动的固有不敏感性可以用来克服最先进的激光韦克菲尔德加速器在增加PWFA级时的稳定性限制。此外，我们证明了产生的电子束的能量扩展和发散上级单级LWFAs，导致在束与密集的相空间和角谱电荷密度超出初始驱动光束参数。这些结果清楚地表明，分级LWFA-PWFA可以帮助定制电子束质量的某些应用，并减少波动的激光驱动器对电子束稳定性的影响。这鼓励进一步发展这种新的分级韦克菲尔德加速类作为一个可行的计划，紧凑，高品质的电子束源。
We present experimental results on a plasma wakefield accelerator (PWFA) driven by high-current electron beams from a laser wakefield accelerator (LWFA). In this staged setup stable and high-quality (low-divergence and low energy spread) electron beams are generated at an optically generated hydro-dynamic shock in the PWFA. The energy stability of the beams produced by that arrangement in the PWFA stage is comparable to both single-stage laser accelerators and plasma wakefield accelerators driven by conventional accelerators. Simulations support that the intrinsic insensitivity of PWFAs to driver energy fluctuations can be exploited to overcome stability limitations of state-of-the-art laser wakefield accelerators when adding a PWFA stage. Furthermore, we demonstrate the generation of electron bunches with energy spread and divergence superior to single-stage LWFAs, resulting in bunches with dense phase space and an angular-spectral charge density beyond the initial drive beam parameters. These results unambiguously show that staged LWFA-PWFA can help to tailor the electron-beam quality for certain applications and to reduce the influence of fluctuating laser drivers on the electron-beam stability. This encourages further development of this new class of staged wakefield acceleration as a viable scheme toward compact, high-quality electron beam sources.