变密度被动等离子体束流收集器的模拟研究
Simulation study of a passive plasma beam dump using varying plasma density
摘要：
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。在本文中，提出了一种改进的被动等离子体束流收集方案，使用梯度或阶梯等离子体轮廓，以保持更高的减速梯度相比，均匀的等离子体。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。粒子在细胞模拟结果表明，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尾场加速。
英文摘要：
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 to 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 to a uniform plasma for an electron bunch of parameters routinely achieved in laser wakefield acceleration.
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