Electron Rephasing in a Laser-Wakefield Accelerator
Electron Rephasing in a Laser-Wakefield Accelerator
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DOI：
10.1103/physrevlett.115.155002
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发表时间：
2015-10-07
影响因子：
8.6
通讯作者：
Malka, V.
中科院分区：
文献类型：
--
作者：
Guillaume, E.;Doepp, A.;Malka, V.
在激光等离子体韦克菲尔德加速器中，能量增益的一个重要限制是退相长度，在此之后，电子束到达韦克菲尔德的减速区域并开始减速。在这里，我们建议操纵电子束在韦克菲尔德场中的相位，以使电子束回到加速区，从而增加最终的电子束能量。在第一个实验中，我们使用一个大的能量扩散的电子束演示了这种技术的原理。然后，我们表明，它可以用来提高单能电子束的能量超过50%。
An important limit for energy gain in laser-plasma wakefield accelerators is the dephasing length, after which the electron beam reaches the decelerating region of the wakefield and starts to decelerate. Here, we propose to manipulate the phase of the electron beam in the wakefield, in order to bring the beam back into the accelerating region, hence increasing the final beam energy. This rephasing is operated by placing an upward density step in the beam path. In a first experiment, we demonstrate the principle of this technique using a large energy spread electron beam. Then, we show that it can be used to increase the energy of monoenergetic electron beams by more than 50%.