arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1801.04093physics.plasm-ph
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用高功率、少周期中红外激光器加速Laser尾流场

Laser wakefield acceleration with high-power, few-cycle mid-IR lasers

Daniel Papp, Jonathan C. Wood, Vincent Gruson, Mina Bionta, Jan-Niclas Gruse, Eric Cormier, Zulfikar Najmudin, François Légaré, Christos Kamperidis

摘要:

与传统的中心波长为0.8-1 μm的近红外激光驱动器(λ激光)相比,中红外激光驱动器的激光尾流场电子加速(LWFA)研究是未来激光驱动电子加速器的一条很有前途的发展方向,因为由于对λ激光的线性依赖性,可以用较小的激光功率获得电子注入所需的矢量势a_0。在这项工作中,我们进行了二维PIC模拟LWFA使用几个周期的高功率(5-15 TW)的激光系统,波长范围从0.88-10 μm的激光。这种少周期系统目前正在开发中,其目标是气体高次谐波产生应用,在这些应用中,有利的λ激光^[2]定标扩展了XUV光子能量的范围。在数值模拟中,我们将a_0和n_e/n_cr(n_e为等离子体密度,n_cr为每个λ激光器的临界密度)作为共同的激励因子,从而可以比较不同λ激光器的驱动因子在加速电子束能量、电荷和转换效率方面的差异。虽然电子能量主要由等离子体动力学控制,但激光到电子束的能量转换效率在较长波长的激光驱动器下显示出显著的增强。

英文摘要:

The study of laser wakefield electron acceleration (LWFA) using mid-IR laser drivers is a promising path for future laser driven electronaccelerators, when compared to traditional near-IR laser drivers uperating at 0.8-1 μm central wavelength (λlaser), as the necessary vector potential a_0 for electron injection can be achieved with smaller laser powers due to the linear dependence on λlaser. In this work, we perform 2D PIC simulations on LWFA using few-cycle high power (5-15 TW) laser systems with λlaser ranging from 0.88-10 μm. Such few-cycle systems are currently under development, aiming at Gas High Harmonics Generation applications where the favourable λlaser^2 scaling extends the range of XUV photon energies. We keep a_0 and n_e/n_cr (n_e being the plasma density and n_cr being the critical density for each λlaser) as common denominators in outr simulations, allowing for comparisons between drivers of different λlaser, with respect to the accelerated electron beam energy, charge, and conversion efficiency. While the electron energies are mainly dominated by the plasma dynamics, the laser to electron beam energy conversion efficiency shows significant enhancement with longer wavelength laser drivers.

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