Laser wakefield and direct acceleration with ionization injection
Laser wakefield and direct acceleration with ionization injection
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DOI：
10.1088/0741-3335/58/3/034011
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发表时间：
2016-02
影响因子：
2.2
通讯作者：
Xi Zhang;V. Khudik;A. Pukhov;G. Shvets
中科院分区：
文献类型：
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作者：
Xi Zhang;V. Khudik;A. Pukhov;G. Shvets
我们证明了使用粒子模拟，电子可以注入到混合激光韦克菲尔德和直接激光加速器通过电离注入。我们提出了一个加速器和注射器的情况下，利用两个激光脉冲。第一（泵浦）脉冲通过从气体混合物的低Z分量排出由其前缘产生的等离子体电子来产生等离子体“气泡”，然后通过电离高Z分量将电子注入气泡中。第二个时间延迟的激光脉冲与这些注入的电子在气泡内进行电子感应加速器振荡共振相互作用。我们表明，离轴和轴上，但离峰值电离阶段电离的电子具有足够的横向能量进行有效的直接激光加速（DLA）。当与气泡纵向等离子体尾流的加速相结合时，DLA可以将总能量增益增加一倍并产生单能束。
We demonstrate using particle-in-cell simulations that electrons can be injected into a hybrid laser wakefield and direct laser accelerator via ionization injection. We propose an accelerator and injector scenario that utilizes two laser pulses. The first (pump) pulse produces the plasma ‘bubble’ by expelling the plasma electrons generated by its leading edge from the low-Z component of the gas mixture, and then injects electrons into the bubble by ionizing the high-Z component. The second time-delayed laser pulse resonantly interacts with these injected electrons undergoing betatron oscillations inside the bubble. We show that the electrons ionized off-axis and on-axis but off the peak ionization phase possess sufficient transverse energy to undergo efficient direct laser acceleration (DLA). When combined with their acceleration by the bubble’s longitudinal plasma wake, DLA can double the total energy gain and produce a monoenergetic beam.