Simulation study of a passive plasma beam dump using varying plasma density
Simulation study of a passive plasma beam dump using varying plasma density
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DOI：
10.1063/1.4977449
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发表时间：
2017-01
影响因子：
2.2
通讯作者：
K. Hanahoe;G. Xia;M. Islam;Y. Li;O. Mete-Apsimon;B. Hidding;J. Smith
中科院分区：
文献类型：
--
作者：
K. Hanahoe;G. Xia;M. Islam;Y. Li;O. Mete-Apsimon;B. Hidding;J. Smith
等离子体束流收集器利用等离子体电子的集体振荡来吸收粒子束的动能。本文提出了一种改进的被动等离子体束流收集方案，它采用梯度或阶梯等离子体轮廓来保持比均匀等离子体更高的减速梯度。这种改进是等离子体波长变化防止低能粒子再加速的结果。粒子模拟结果表明，阶梯和梯度等离子体的轮廓可以实现改善的能量损失相比，均匀的等离子体的电子束的参数常规实现在激光韦克菲尔德加速。
A plasma beam dump uses the collective oscillations of plasma electrons to absorb the kinetic energy of a particle beam. In this paper, a modified passive plasma beam dump scheme is proposed using either a gradient or stepped plasma profile to maintain a higher decelerating gradient compared with a uniform plasma. The improvement is a result of the plasma wavelength change preventing the re-acceleration of low energy particles. Particle-in-cell simulation results show that both stepped and gradient plasma profiles can achieve improved energy loss compared with a uniform plasma for an electron bunch of parameters routinely achieved in laser wakefield acceleration.