Formation and evolution of a pair of collisionless shocks in counterstreaming flows
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- Formation and evolution of a pair of collisionless shocks in counterstreaming flows
- 发表刊物：
- Scientific Reports
- 摘要：
- A pair of collisionless shocks that propagate in the opposite directions are firstly observed in the interactions of laser-produced counter-streaming flows. The flows are generated by irradiating a pair of opposing copper foils with eight laser beams at the Shenguang-II (SG-II) laser facility. The experimental results indicate that the excited shocks are collisionless and electrostatic, in good agreement with the theoretical model of electrostatic shock. The particle-in-cell (PIC) simulations verify that a strong electrostatic field growing from the interaction region contributes to the shocks formation. The evolution is driven by the thermal pressure gradient between the upstream and the downstream. Theoretical analysis indicates that the strength of the shocks is enhanced with the decreasing density ratio during both flows interpenetration. The positive feedback can offset the shock decay process. This is probable the main reason why the electrostatic shocks can keep stable for a longer time in our experiment.
- 合写作者：
- Dawei Yuan, Yutong Li, Meng Liu, Jiayong Zhong, Baojun Zhu, Yanfei Li,...
- 是否译文：
- 否
- 发表时间：
- 2017-03-07