标题： 通过逆向传播激光脉冲中的QED级联进行激光吸收 显示英文标题

标题： Laser absorption via QED cascades in counter propagating laser pulses

摘要： 描述了一种通过QED级联自洽产生的电子-正电子等离子体中激光光吸收的模型。 激光能量主要由于通过非线性康普顿散射产生的硬光子辐射而被吸收。 吸收程度取决于激光强度和脉冲持续时间。 通过多维粒子模拟结合QED模块和一种宏观粒子合并算法来研究QED级联，该算法能够处理粒子数量的指数增长。 结果范围从中等强度区域（$\sim$10 PW），其中激光吸收可以忽略不计，到极端强度（>100 PW），其中吸收程度达到80%。 我们的研究显示了分析模型与模拟之间良好的一致性。 研究了硬光子辐射和生成的对等离子体的预期特性，并讨论了近未来激光设施的实验特征。 显示英文摘要

摘要： A model for laser light absorption in electron-positron plasmas self-consistently created via QED cascades is described. The laser energy is mainly absorbed due to hard photon emission via nonlinear Compton scattering. The degree of absorption depends on the laser intensity and the pulse duration. The QED cascades are studied with multi-dimensional particle-in-cell simulations complemented by a QED module and a macro-particle merging algorithm that allows to handle the exponential growth of the number of particles. Results range from moderate-intensity regimes ($\sim$ 10 PW) where the laser absorption is negligible, to extreme intensities (> 100 PW) where the degree of absorption reaches 80%. Our study demonstrates good agreement between the analytical model and simulations. The expected properties of the hard photon emission and the generated pair-plasma are investigated, and the experimental signatures for near-future laser facilities are discussed.