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首页> 外文期刊>Plasma physics and controlled fusion >Simulations of bremsstrahlung emission in ultra-intense laser interactions with foil targets
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Simulations of bremsstrahlung emission in ultra-intense laser interactions with foil targets

机译：与箔靶的超强度激光相互作用中的Bremsstrahlung发射的模拟

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摘要

Bremsstrahlung emission from interactions of short ultra-intense laser pulses with solid foils is studied using particle-in-cell (PIC) simulations. A module for simulating bremsstrahlung has been implemented in the PIC loop to self-consistently account for the dynamics of the laser-plasma interaction, plasma expansion, and the emission of gamma ray photons. This module made it possible to study emission from thin targets, where refluxing of hot electrons plays an important role. It is shown that the angular distribution of the emitted photons exhibits a four-directional structure with the angle of emission decreasing with the increase of the width of the target. Additionally, a collimated forward flash consisting of high energy photons has been identified in thin targets. The conversion efficiency of the energy of the laser pulse to the energy of the gamma rays rises with both the driving pulse intensity, and the thickness of the target. The amount of gamma rays also increases with the atomic number of the target material, despite a lower absorption of the driving laser pulse. The angular spectrum of the emitted gamma rays is directly related to the increase of hot electron divergence during their refluxing and its measurement can be used in experiments to study this process.
机译：使用粒子内（PIC）模拟研究了使用固体箔的短超强激光脉冲的相互作用的Bremsstrahlung排放。用于模拟Bremsstrahlung的模块已经在PIC环中实施到自我一致地占激光等离子体相互作用，等离子体膨胀和伽马射线光子的发射的动态。该模块使得可以从薄靶中研究发射，其中热电子的回流起着重要作用。结果表明，随着目标宽度的增加，发射光子的角度分布表现出具有发射角度的四方向结构。另外，在薄的靶标中鉴定了由高能光子组成的准直向闪光。激光脉冲的能量与伽马射线的能量的转换效率随着驱动脉冲强度和目标的厚度而上升。尽管驱动激光脉冲的吸收较低，但伽马射线的量也随着目标材料的原子数而增加。发射的伽马射线的角谱与回流过程中热电子发散的增加直接相关，并且其测量可以用于研究该过程的实验。

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