Abstract

We study and discuss electron acceleration in vacuum interacting with fundamental Gaussian pulses using specific parameters relevant for the multi-PW femtosecond lasers at ELI-NP. Taking into account the characteristic properties of both linearly and circularly polarized Gaussian beams near focus we have calculated the optimal values of beam waist leading to the most energetic electrons for given laser power. The optimal beam waist at full width at half maximum correspond to few tens of wavelengths, Δw₀ = {13, 23, 41}λ₀, for increasing laser power P₀ = {0.1, 1, 10} PW. Using these optimal values we found an average energy gain of a few MeV and highest-energy electrons of about 160 MeV in full-pulse interactions and in the GeV range in case of half-pulse interaction.

Graphical abstract

中文翻译：

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在ELI-NP上优化直接激光驱动的电子加速度和能量增益

摘要

我们使用与ELI-NP处的多PW飞秒激光器相关的特定参数，研究和讨论真空中与基本高斯脉冲相互作用时的电子加速度。考虑到线性和圆偏振的高斯光束在聚焦附近的特性，我们计算了给定激光功率下导致最高能量电子的束腰的最佳值。在全宽的最佳束腰半最大值对应于数十波长，Δ瓦特₀  = {13，23，41} λ ₀，为了增加激光功率P ₀ = {0.1，1，10} PW。使用这些最佳值，我们发现在全脉冲相互作用中，平均能量增益为几个MeV，最高能量电子约为160 MeV，在半脉冲相互作用的情况下，在GeV范围内。

图形概要