纳米棒阵列靶中产生的γ光子和正电子的阿秒束
Attosecond bunches of gamma photons and positrons generated in nanorod array targets
摘要：
通过产生高质量的电子聚束和亚飞秒持续时间的X射线脉冲，在极短时间尺度上进行物理过程的亚原子实验探索已经成为可能。时间相干性对于在基于衍射的诊断中实现高分辨率是至关重要的，并且如果还提供横向空间相干性，则还可以观察到具有非常小的截面的现象。将光子能量从X射线增加到伽马射线区域使得可以探测极小的时空域。在这里，阿秒伽马光子和正电子聚束与小发散使用低于$10^{23}$ W/cm $^2$的激光强度的机制提出。数值模拟是用来制定相干辐射的条件和产生的光子和正电子束的特点。
英文摘要：
The sub-atomic experimental exploration of physical processes on extremely short time scales has become possible by the generation of high quality electron bunches and x-ray pulses with sub-femtosecond durations. Temporal coherence is crucial for achieving high resolution in diffraction-based diagnostics and if the transverse spatial coherence is also provided, then phenomena with very small cross sections could also be observed. Increasing the photon energy from x-ray to gamma-ray regime makes probing of extremely small space-time domains accessible. Here, a mechanism for generating attosecond gamma photon and positron bunches with small divergence using laser intensities below $10^{23}$ W/cm$^2$ is proposed. Numerical simulations are used to formulate the conditions for coherent radiation and to characterize the generated photon and positron bunches.
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。
