Grismayer T, Vranic M, Martins J L, Fonseca R A, Silva L O
GoLP/Instituto de Plasmas e Fusão Nuclear, Universidade de Lisboa, Lisbon, Portugal.
DCTI/ISCTE Instituto Universitário de Lisboa, 1649-026 Lisboa, Portugal.
Phys Rev E. 2017 Feb;95(2-1):023210. doi: 10.1103/PhysRevE.95.023210. Epub 2017 Feb 27.
The growth rates of seeded QED cascades in counterpropagating lasers are calculated with first-principles two- and three-dimensional QED-PIC (particle-in-cell) simulations. The dependence of the growth rate on the laser polarization and intensity is compared with analytical models that support the findings of the simulations. The models provide insight regarding the qualitative trend of the cascade growth when the intensity of the laser field is varied. A discussion about the cascade's threshold is included, based on the analytical and numerical results. These results show that relativistic pair plasmas and efficient conversion from laser photons to γ rays can be observed with the typical intensities planned to operate on future ultraintense laser facilities such as ELI or Vulcan.
利用第一性原理二维和三维量子电动力学粒子模拟（QED-PIC）计算了反向传播激光中种子量子电动力学级联的增长率。将增长率对激光偏振和强度的依赖性与支持模拟结果的解析模型进行了比较。这些模型在激光场强度变化时，对级联增长的定性趋势提供了见解。基于解析和数值结果，对级联的阈值进行了讨论。这些结果表明，在计划用于未来超强激光设施（如ELI或Vulcan）的典型强度下，可以观测到相对论对等离子体以及从激光光子到γ射线的高效转换。
