Phase Velocity and Particle Injection in a Self-Modulated Proton-Driven Plasma Wakefield Accelerator
Phase Velocity and Particle Injection in a Self-Modulated Proton-Driven Plasma Wakefield Accelerator
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DOI：
10.1103/physrevlett.107.145003
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发表时间：
2011-09-28
影响因子：
8.6
通讯作者：
Shvets, G.
中科院分区：
文献类型：
--
作者：
Pukhov, A.;Kumar, N.;Shvets, G.
结果表明，等离子体波的相速度约化对自调制质子驱动等离子体韦克菲尔德加速器的性能有很大的影响。使用分析理论和粒子在细胞模拟，我们表明，减少是最大的自调制的线性阶段。当不稳定性非线性饱和时，相速度接近驱动器的相速度。尾流动力学对加速电子的最大能量增益的有害影响可以使用电子的侧注入或通过平滑等离子体密度梯度控制尾流的相速度来避免。
It is demonstrated that the performance of the self-modulated proton driver plasma wakefield accelerator is strongly affected by the reduced phase velocity of the plasma wave. Using analytical theory and particle-in-cell simulations, we show that the reduction is largest during the linear stage of self-modulation. As the instability nonlinearly saturates, the phase velocity approaches that of the driver. The deleterious effects of the wake's dynamics on the maximum energy gain of accelerated electrons can be avoided using side-injections of electrons, or by controlling the wake's phase velocity by smooth plasma density gradients.