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在激光驱动粒子加速和快点火背景下,用带碰撞模块的1维粒子模拟程序,研究了高功率亚ps激光与高密度(近固体密度)碳薄膜靶相互作用中的碰撞效应。研究表明,通过和无碰撞粒子模拟结果的比对,在早期瞬态时段,碰撞效应通过慢化提供电阻加热的回流对快电子产生和输运起重要作用。定性上,碰撞效应还减少快电子的产额和最大能,抑制能量输运。然而,在加热后期当往返运动成为主要输运机制时,有碰撞和无碰撞两种情况的差别减小。
In the context of laser-driven particle acceleration and rapid ignition, the collision effect of the high-power sub-ps laser and the high-density (near-solid density) carbon thin film target interaction was investigated using a 1-D particle simulation program with a collision module. It has been shown that by comparing the simulation results with those without collisions, in the early transient period, the collision effect provides resistance heating by moderating backflow and plays an important role in fast electron generation and transport. Qualitatively, the collision effect also reduces the yield and maximum energy of fast electrons, inhibiting energy transport. However, when the reciprocating motion became the main transport mechanism in the later heating stage, the differences between the collisions and the non-collisions decreased.