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arXiv 2402.08026physics.plasm-ph
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激光聚焦条件对电子直接激光加速的影响

The Influence of Laser Focusing Conditions on the Direct Laser Acceleration of Electrons

H. Tang, K. Tangtartharakul, R. Babjak, I-L. Yeh, F. Albert, H. Chen, P. T. Campbell, Y. Ma, P. M. Nilson, B. K. Russell, J. L. Shaw, A. G. R. Thomas, M. Vranic… 展开作者

H. Tang, K. Tangtartharakul, R. Babjak, I-L. Yeh, F. Albert, H. Chen, P. T. Campbell, Y. Ma, P. M. Nilson, B. K. Russell, J. L. Shaw, A. G. R. Thomas, M. Vranic, A. V. Arefiev, L. Willingale

AI总结:

本研究探究激光聚焦条件对电子直接激光加速的影响,通过实验与模拟揭示聚焦条件调控电子加速的机制,建立了普适性最佳焦斑尺寸计算模型并获实验验证。

摘要:

高能皮秒激光与低密度等离子体相互作用过程中的电子直接激光加速(Direct Laser Acceleration,DLA)已被证实可通过调控激光聚焦几何结构得到显著增强。利用OMEGA EP装置开展的实验测量到,在特定激光聚焦、脉冲能量及等离子体密度条件下,电子被加速至的最大能量超过有质动力能量的120倍。二维粒子模拟(particle-in-cell)结果表明,激光聚焦条件会改变激光场演化、通道场生成以及电子振荡,这些因素共同决定了最终的电子能量。当被加速电子在通道场中的横向振荡振幅与激光束宽度匹配时,可获得最佳激光聚焦条件,实现高效的能量增益。基于这一观测结果,研究人员建立了一个可在更普遍条件下计算最佳激光焦斑尺寸的简单模型,且该模型已得到实验数据的验证。

英文摘要:

Direct Laser Acceleration (DLA) of electrons during a high-energy, picosecond laser interaction with an underdense plasma has been demonstrated to be substantially enhanced by controlling the laser focusing geometry. Experiments using the OMEGA EP facility measured electrons accelerated to maximum energies exceeding 120 times the ponderomotive energy under certain laser focusing, pulse energy, and plasma density conditions. Two-dimensional particle-in-cell simulations show that the laser focusing conditions alter the laser field evolution, channel fields generation, and electron oscillation, all of which contribute to the final electron energies. The optimal laser focusing condition occurs when the transverse oscillation amplitude of the accelerated electron in the channel fields matches the laser beam width, resulting in efficient energy gain. Through this observation, a simple model was developed to calculate the optimal laser focal spot size in more general conditions and is validated by experimental data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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