Effect of plasma inhomogeneity on plasma wakefield acceleration driven by long bunches
Effect of plasma inhomogeneity on plasma wakefield acceleration driven by long bunches
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DOI：
10.1063/1.4773905
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发表时间：
2012-05
期刊：
影响因子：
--
通讯作者：
K. Lotov;A. Pukhov;A. Caldwell
中科院分区：
文献类型：
--
作者：
K. Lotov;A. Pukhov;A. Caldwell
数值研究了等离子体不均匀性对自调制质子束和加速电子的影响。主要的影响是尾场波长的变化，从而导致相移和加速粒子的损失。这种效应对长粒子束驱动的等离子体尾波场加速器的密度均匀性造成了严重的限制。与加速粒子相比，将长束转化为一串微束的横向两流不稳定性对密度不均匀的敏感性较低。团簇自由地穿过密度增加的区域，并与密度降低的区域相互作用。
Effects of plasma inhomogeneity on self-modulating proton bunches and accelerated electrons were studied numerically. The main effect is the change of the wakefield wavelength which results in phase shifts and loss of accelerated particles. This effect imposes severe constraints on density uniformity in plasma wakefield accelerators driven by long particle bunches. The transverse two stream instability that transforms the long bunch into a train of micro-bunches is less sensitive to density inhomogeneity than are the accelerated particles. The bunch freely passes through increased density regions and interacts with reduced density regions.