Effects of simulation dimensionality on laser-driven electron acceleration and photon emission in hollow microchannel targets
Effects of simulation dimensionality on laser-driven electron acceleration and photon emission in hollow microchannel targets
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DOI：
10.1103/physreve.104.045206
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发表时间：
2021-10-18
影响因子：
2.4
通讯作者：
Arefiev, Alexey
中科院分区：
文献类型：
--
作者：
Wang, Tao;Blackman, David;Arefiev, Alexey
利用二维（2D）和三维（3D）动力学模拟，我们研究了模拟维度对激光驱动的电子加速和从空心微通道目标发射准直伽马射线束的影响。我们证明了由于不同几何形状的激光相速度的变化，模拟的维数对电子加速和光子产生的结果有很大的影响。在具有圆柱几何形状的三维仿真中，由于激光场的传播相速度较高，电子的加速过程提前终止；相反，具有平面几何的二维模拟往往具有延长的电子加速，从而产生更高能的电子。发现在三维装置中产生的光子束发散更大，但转换效率较低。本文的结论是，二维模拟可以定性地再现三维模拟的特征，但为了定量评估和可靠预测，以方便实验设计，强烈建议进行三维建模。
Using two-dimensional (2D) and three-dimensional (3D) kinetic simulations, we examine the impact of simulation dimensionality on the laser-driven electron acceleration and the emission of collimated gamma -ray beams from hollow microchannel targets. We demonstrate that the dimensionality of the simulations considerably influences the results of electron acceleration and photon generation owing to the variation of laser phase velocity in different geometries. In a 3D simulation with a cylindrical geometry, the acceleration process of electrons terminates early due to the higher phase velocity of the propagating laser fields; in contrast, 2D simulations with planar geometry tend to have prolonged electron acceleration and thus produce much more energetic electrons. The photon beam generated in the 3D setup is found to be more diverged accompanied with a lower conversion efficiency. Our paper concludes that the 2D simulation can qualitatively reproduce the features in 3D simulation, but for quantitative evaluations and reliable predictions to facilitate experiment designs 3D modeling is strongly recommended.