Generating high-brightness electron beams via ionization injection by transverse colliding lasers in a plasma-wakefield accelerator.
Generating high-brightness electron beams via ionization injection by transverse colliding lasers in a plasma-wakefield accelerator.
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DOI：
10.1103/physrevlett.111.015003
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发表时间：
2013-01
影响因子：
8.6
通讯作者：
F. Li;J. Hua;X. Xu;C. Zhang;L. Yan;Y. C. Du;W. Huang;H. B. Cheng;C. Tang;W. Lu
中科院分区：
文献类型：
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作者：
F. Li;J. Hua;X. Xu;C. Zhang;L. Yan;Y. C. Du;W. Huang;H. B. Cheng;C. Tang;W. Lu
利用三维粒子模拟方法研究了在束流驱动等离子体尾流中，由两束横向碰撞的激光脉冲触发电离注入产生超亮电子束团的过程。相对低强度的激光沿尾流轴沿着偏振，并在很短的时间内与尾流重叠。其结果是，电离电子在尾流横向平面中的剩余动量减少，并且注入沿着尾流的传播轴局部化。这使初始热发射度和由于横向相混合引起的发射度增长最小化。模拟结果表明，在实际参数条件下，可以得到超短（~8 fs）强流（0.4kA）电子束团，在两个平面上的归一化发射度分别为8.5和6 nm，亮度为1.7×10（19）A rad（-2）m（-2）。
The production of ultrabright electron bunches using ionization injection triggered by two transversely colliding laser pulses inside a beam-driven plasma wake is examined via three-dimensional particle-in-cell simulations. The relatively low intensity lasers are polarized along the wake axis and overlap with the wake for a very short time. The result is that the residual momentum of the ionized electrons in the transverse plane of the wake is reduced, and the injection is localized along the propagation axis of the wake. This minimizes both the initial thermal emittance and the emittance growth due to transverse phase mixing. Simulations show that ultrashort (~8 fs) high-current (0.4 kA) electron bunches with a normalized emittance of 8.5 and 6 nm in the two planes, respectively, and a brightness of 1.7×10(19) A rad(-2) m(-2) can be obtained for realistic parameters.