Signatures of quantum radiation reaction in laser-electron-beam collisions
Signatures of quantum radiation reaction in laser-electron-beam collisions
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DOI：
10.1063/1.4929851
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发表时间：
2015-09
影响因子：
2.2
通讯作者：
H. Y. Wang;Xueqing Yan;M. Zepf
中科院分区：
文献类型：
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作者：
H. Y. Wang;Xueqing Yan;M. Zepf
采用三维QED粒子模拟方法研究了电子束与强聚焦超短激光脉冲碰撞过程中的电子动力学行为，并与经典的朗道和Lifshitz粒子模拟结果进行了比较.从两种不同方法的电子能量分布模式的角度依赖性观察到显着差异，因为光子发射不再很好地近似于量子辐射为主的制度中的连续过程。光子发射的随机性导致在一定条件下量子辐射反应效应的强烈特征。我们发现，由于量子电动力学效应和有质动力的竞争，激光光斑的大小和持续时间极大地影响这些签名，这是很好地描述在经典近似。量子辐射反应的最清晰的特征是在大光斑和小周期脉冲宽度的限制下。
Electron dynamics in the collision of an electron beam with a high-intensity focused ultrashort laser pulse are investigated using three-dimensional QED particle-in-cell (PIC) simulations, and the results are compared with those calculated by classical Landau and Lifshitz PIC simulations. Significant differences are observed from the angular dependence of the electron energy distribution patterns for the two different approaches, because photon emission is no longer well approximated by a continuous process in the quantum radiation-dominated regime. The stochastic nature of photon emission results in strong signatures of quantum radiation-reaction effects under certain conditions. We show that the laser spot size and duration greatly influence these signatures due to the competition of QED effects and the ponderomotive force, which is well described in the classical approximation. The clearest signatures of quantum radiation reaction are found in the limit of large laser spots and few cycle pulse durations.