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arXiv 1711.03476physics.plasm-phphysics.acc-ph
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相对论透明区直接laser加速电子的注入动力学

Injection dynamics of direct-laser accelerated electrons in a relativistic transparency regime

K. Jiang, C. T. Zhou, T. W. Huang, L. B. Ju, H. Zhang, B. Qiao, S. C. Ruan

摘要:

采用三维粒子模拟和理论分析相结合的方法,研究了激光直接加速(DLA)过程中电子注入的动力学过程。结果表明,当超强激光脉冲入射到近临界密度或相对论透明等离子体中时,纵向电荷分离电场激发出离子波。离子波调制了局部电场,并作为一组势阱将位于等离子体通道边缘的电子引导到中心区域,随后在中心区域发生DLA,同时指出自生方位磁场通过使电子偏离激光场区域而抑制了电子的注入过程.了解这些物理过程为进一步优化直接激光加速电子束和相关X/γ射线源的特性铺平了道路。

英文摘要:

The dynamics of electron injection in the direct laser acceleration (DLA) regime was investigated by means of three-dimensional particle-in-cell simulations and theoretical analysis. It is shown that when an ultra-intense laser pulse propagates into a near-critical density or relativistically transparent plasma, the longitudinal charge-separation electric field excites an ion wave. The ion wave modulates the local electric field and acts as a set of potential wells to guide the electrons, located on the edge of the plasma channel, to the central region, where the DLA takes place later on. In addition, it is pointed out that the self-generated azimuthal magnetic fields tend to suppress the injection process of electrons by deflecting them away from the laser field region. Understanding these physical processes paves the way for further optimizing the properties of direct-laser accelerated electron beams and the associated X/gamma-ray sources.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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