Controlling the betatron oscillations of a wakefield-accelerated electron beam by temporally asymmetric laser pulses
Controlling the betatron oscillations of a wakefield-accelerated electron beam by temporally asymmetric laser pulses
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DOI：
10.1063/1.3577566
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发表时间：
2011-04
影响因子：
2.2
通讯作者：
I. Nam;M. Hur;H. Uhm;N. Hafz;H. Suk
中科院分区：
文献类型：
--
作者：
I. Nam;M. Hur;H. Uhm;N. Hafz;H. Suk
基于二维粒子模拟方法，研究了激光韦克菲尔德加速过程中电子束在时间非对称激光脉冲作用下的横向振荡。在这篇文章中特别感兴趣的是超短激光脉冲具有急剧上升和缓慢下降的时间尺度的影响。在这种情况下，加速的电子束直接与激光场相互作用，并由于与激光场的相位滑移而经历横向振荡。由于离子的聚焦力，这种振荡可以与电子感应加速器振荡相匹配，由于它们之间的共振，这可以导致大的横向振荡幅度。此外，在这种情况下，电子束可以在激光波长处微聚束，这可以提供产生相干同步加速器辐射的可能性。
Based on two-dimensional particle-in-cell simulations, we investigated the electron beam’s transverse oscillations by temporally asymmetric laser pulses in laser wakefield acceleration. Of particular interest in this article are the effects of ultrashort laser pulses having sharp rising and slow falling time scales. In this situation, the accelerated electron beam interacts directly with the laser field and undergoes transverse oscillations due to a phase-slip with the laser field. This oscillation can be matched with the betatron oscillation due to the focusing force of the ions, which can lead to a large transverse oscillation amplitude due to the resonance between them. Furthermore, in this case, the electron beam can be microbunched at the laser wavelength, which may provide the possibility for generation of a coherent synchrotron radiation.