Gamma-ray flash in the interaction of a tightly focused single-cycle ultra-intense laser pulse with a solid target
Gamma-ray flash in the interaction of a tightly focused single-cycle ultra-intense laser pulse with a solid target
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DOI：
10.1017/s0022377821001318
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发表时间：
2022-01-19
影响因子：
2.5
通讯作者：
Bulanov, S., V
中科院分区：
文献类型：
--
作者：
Hadjisolomou, P.;Jeong, T. M.;Bulanov, S., V
我们采用λ（3）机制，其中近单周期激光脉冲被紧密聚焦，从而在一定的激光功率下为最小能量提供最高可能的强度。采用三维粒子模拟方法研究了超强激光与固体靶相互作用过程中的量子电动力学过程，揭示了大量γ光子和正负电子对的产生。激光偏振，目标厚度和电子数密度的参数研究表明，径向偏振激光提供了最佳的制度，γ光子产生。通过在1至300 PW的范围内改变激光功率，我们发现激光到伽马光子能量转换效率的缩放。使用蒙特卡罗模拟进一步研究了激光产生的伽马光子与高Z靶的相互作用，揭示了进一步的电子-正电子对产生和放射性核素的产生。
We employ the lambda(3) regime where a near-single-cycle laser pulse is tightly focused, thus providing the highest possible intensity for the minimal energy at a certain laser power. The quantum electrodynamics processes in the course of the interaction of an ultra-intense laser with a solid target are studied via three-dimensional particle-in-cell simulations, revealing the generation of copious gamma-photons and electron-positron pairs. A parametric study of the laser polarisation, target thickness and electron number density shows that a radially polarised laser provides the optimal regime for gamma-photon generation. By varying the laser power in the range of 1 to 300 PW we find the scaling of the laser to gamma-photon energy conversion efficiency. The laser-generated gamma-photon interaction with a high-Z target is further studied using Monte Carlo simulations revealing further electron-positron pair generation and radioactive nuclide creation.