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arXiv 2103.14346physics.plasm-phphysics.acc-ph
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螺旋光束中的直接激光驱动电子加速与能量增益

Direct laser-driven electron acceleration and energy gain in helical beams

Etele Molnár, Dan Stutman

AI总结:

本文研究了螺旋光束LG0m中的直接激光驱动电子加速,发现与基模Gaussian光束相比,其最佳束腰更小且电子平均动能增益高约一个数量级,随方位角指数增加可产生几百MeV的准直电子。

摘要:

本文详细研究了对应于螺旋光束 $\text{LG}_{0m}$ 且方位角模式 $m=\left\{1,2,3,4,5\right\}$ 的旁轴 Laguerre-Gaussian 模式中的直接激光驱动电子加速。由于基模 Gaussian 光束 $\text{LG}_{00}$ 与螺旋光束 $\text{LG}_{0m}$ 的有质动力存在差异,我们发现后者的最佳束腰(产生半高全宽下最高能量电子)缩小了两倍多,并且在激光功率 $P_0 = \left\{0.1,1,10\right\}$ PW 时对应于几个波长 $Δw_0=\left\{6,11,19\right\}λ_0$。我们还发现,对于方位角模式 $m\geq 3$,最佳束腰应小于 $Δw_0 < 19 λ_0$。利用这些最佳值,我们观察到螺旋光束中电子的平均动能增益比基模 Gaussian 光束高约一个数量级。该平均能量增益随方位角指数 $m$ 增加而增加,从而在激光传播方向上产生能量为几百 $100$ MeV 的准直电子。

英文摘要:

A detailed study of direct laser-driven electron acceleration in paraxial Laguerre-Gaussian modes corresponding to helical beams $\text{LG}_{0m}$ with azimuthal modes $m=\left\{1,2,3,4,5\right\}$ is presented. Due to the difference between the ponderomotive force of the fundamental Gaussian beam $\text{LG}_{00}$ and helical beams $\text{LG}_{0m}$ we found that the optimal beam waist leading to the most energetic electrons at full width at half maximum is more than twice smaller for the latter and corresponds to a few wavelengths $Δw_0=\left\{6,11,19\right\}λ_0$ for laser powers of $P_0 = \left\{0.1,1,10\right\}$ PW. We also found that for azimuthal modes $m\geq 3$ the optimal waist should be smaller than $Δw_0 < 19 λ_0$. Using these optimal values we have observed that the average kinetic energy gain of electrons is about an order of magnitude larger in helical beams compared to the fundamental Gaussian beam. This average energy gain increases with the azimuthal index $m$ leading to collimated electrons of a few $100$ MeV energy in the direction of the laser propagation.

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