外加电场中自加速电子相空间洞的模拟
Simulations of self-accelerating electron phase space holes in an applied electric field
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中文总结 AI 辅助
本文通过一维静电Vlasov模拟，研究外加均匀或正弦电场对电子相空间洞自加速行为的影响，揭示外电场可延缓或抑制自加速、诱导洞分裂及次级洞产生等现象。
中文摘要 AI 辅助
通过一维静电Vlasov模拟，研究外加电场中电子相空间洞的自加速现象。电子洞（EHs）以自洽方式初始化，离子保持不动，模拟开始时启用离子响应。开展基准模拟以确认无外电场时EHs的自加速现象，随后分别施加均匀电场和正弦电场，研究不同强度与持续时间的外电场对EHs行为的影响。结果发现，沿自加速方向施加的均匀电场可延缓该过程的起始，并改变EHs的最终速度；当正弦电场的振幅和持续时间适当时，可将EHs固定在初始位置并抑制其自加速。此外，还观察到外电场可诱导EHs分裂及次级EHs的产生，文中对这些现象的物理机制进行了详细讨论。
英文摘要
The self-acceleration of electron phase space holes in an applied electric field is investigated via one-dimensional electrostatic Vlasov simulations. The electron holes (EHs) are initialized in a self-consistent manner with immobile ions, and the ion response is enabled at the beginning of simulations. A benchmark simulation is conducted to confirm the EH self-acceleration in the absence of the external electric field. Then, we investigate the EH behaviors by applying the uniform and sinusoidal electric fields, respectively. The effects of different strengths and durations of these external electric fields are studied. It is found that the uniform electric field applied in the direction of the self-acceleration can delay the onset of this process and change the final speed of EHs. The applied sinusoidal electric field can fix the EHs at their initial positions and suppress the self-acceleration if the electric field amplitude and duration are appropriate. In addition, it is observed that these external electric fields can induce the splitting of EHs and the generation of secondary EHs. The physical mechanisms of these phenomena are discussed in detail.
