Hybrid modeling of relativistic underdense plasma photocathode injectors
Hybrid modeling of relativistic underdense plasma photocathode injectors
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DOI：
10.1103/physrevstab.16.031303
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发表时间：
2013-03
影响因子：
--
通讯作者：
Y. Xi;B. Hidding;D. Bruhwiler;G. Pretzler;J. Rosenzweig
中科院分区：
文献类型：
--
作者：
Y. Xi;B. Hidding;D. Bruhwiler;G. Pretzler;J. Rosenzweig
对最近引入的等离子体光电阴极概念中基于激光电离的电子注入的动力学进行了分析和细胞内颗粒模拟。通过使用 Ammosov-Deloine-Krainov 理论以及非绝热 Yudin-Ivanov (YI) 电离理论以及激光和等离子体波场组合中的后续下游动力学，描述了等离子体尾场加速器中通过背景气体电离释放电子的初始少周期激光脉冲对最终电子相空间的影响。通过求解光电子的相对论运动方程来跟踪光电子。他们体验了分析描述的瞬态激光场和模拟得出的等离子体尾场。结果表明，多 GV/m 尺度等离子体尾场中释放的飞秒尺度电子束的最小归一化发射度为 10-2 mm mrad 量级。这种前所未有的数值，加上电子束产生的可控性的显着提高，为高度紧凑且超高质量的基于等离子体的电子加速器和光源应用铺平了道路。
The dynamics of laser ionization-based electron injection in the recently introduced plasma photocathode concept is analyzed analytically and with particle-in-cell simulations. The influence of the initial few-cycle laser pulse that liberates electrons through background gas ionization in a plasma wakefield accelerator on the final electron phase space is described through the use of Ammosov-Deloine-Krainov theory as well as nonadiabatic Yudin-Ivanov (YI) ionization theory and subsequent downstream dynamics in the combined laser and plasma wave fields. The photoelectrons are tracked by solving their relativistic equations of motion. They experience the analytically described transient laser field and the simulation-derived plasma wakefields. It is shown that the minimum normalized emittance of fs-scale electron bunches released in mulit-GV/m-scale plasma wakefields is of the order of 10-2 mm mrad. Such unprecedented values, combined with the dramatically increased controllability of electron bunch production, pave the way for highly compact yet ultrahigh quality plasma-based electron accelerators and light source applications.