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作 者:祝昕哲 刘维媛 陈民 Zhu Xin-Zhe;Liu Wei-Yuan;Chen Min(Key Laboratory for Laser Plasmas of Ministry of Education,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China)
机构地区:[1]上海交通大学物理与天文学院激光等离子体教育部重点实验室
出 处:《物理学报》2020年第3期206-214,共9页Acta Physica Sinica
基 金:国家自然科学基金(批准号:11991074,11774227);科学挑战计划项目(批准号:TZ2018005)资助的课题~~
摘 要:超短超强激光脉冲在气体等离子体中激发的尾波场加速在过去40年里有了长足的发展,人们已经在厘米加速距离内获得了数GeV的准单能电子加速,激光尾波加速的最高电子能量已经达到8 GeV.为了进一步提升加速电子束的稳定性和品质,多种电子注入方式先后被提出.本文研究了基于锐真空-等离子体边界面的密度跃变注入,着重讨论了不同角度的倾斜边界面对注入电子品质的影响.二维粒子模拟研究表明,与倾角为0°的垂直边界面相比,在合适的倾斜边界角下,第二个尾波空泡内产生的注入电量可以有近三倍的提升,同时偏振方向与入射面平行的驱动激光可以增加第一个空泡内注入电子的电量.根据不同激光入射角度时尾波场中电子自注入的起始位置差异,分析了电子电量与横向振荡增强的原因.这些研究有利于提升基于Betatron运动的尾波场辐射及其应用.Plasma wakefield acceleration driven by ultra short ultra intense laser pulse interacting with gas target has been studied for almost four decades.Monoenergetic electron beams with central energy of multi-giga electron-volt have been achieved in a centimeter-scale acceleration distance.Currently,the highest energy of electrons accelerated by laser wakefield is 8 GeV.In order to further improve the quality of such electrons,many kinds of electron injection schemes have been proposed such as density gradient injection,colliding pulse injection and ionization injection.Electrons under the suitable conditions can be trapped by the strong plasma wakefield.Those trapped electrons are then accelerated in the wakefield.In a nonlinear regime,the wakefield shows a“bubble”structure.Electrons with transverse momentum can oscillate in the wakefield and produce considerably betatron radiation in the ultraviolet and X-ray region.In this paper,we study the electron injection around the sharp plasma-vacuum boundary.The effects of the slant angle of the boundary on the final electron quality are investigated in detail.Our results show that with optimal slant density transition around the vacuum plasma boundary,both the beam quality and the injection charge in the second“bubble”can be improved.Two-dimensional particle-in-cell simulations show that the injection charge in the second wake bucket can be increased three times when an optimal slant angle is used compared with a vertical boundary.The driving pulse’s polarization also affects the injection charge.When the polarization is in the injection plane the injection charge in the first bucket can be triply increased compared with the case when the polarization is out of the plane.The reasons for the enhanced injection charge and transverse oscillation are found by tracing the initial injection positions and trajectories of the electrons.These studies would benefit the electron acceleration and its applications,such as compact betatron radiation source.
关 键 词:激光等离子体相互作用 激光等离子体尾波加速 电子注入
分 类 号:TN24[电子电信—物理电子学] O53[理学—等离子体物理]
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