Gev-Scale Accelerators Driven by Plasma-Modulated Pulses from Kilohertz Lasers.
Gev-Scale Accelerators Driven by Plasma-Modulated Pulses from Kilohertz Lasers.
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DOI：
10.1103/physrevlett.127.184801
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发表时间：
2021-10
影响因子：
8.6
通讯作者：
O. Jakobsson;S. Hooker;R. T. C. F. O. Science;D. Physics;U. Oxford
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文献类型：
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作者：
O. Jakobsson;S. Hooker;R. T. C. F. O. Science;D. Physics;U. Oxford
我们描述了一种用长激光脉冲驱动 GeV 级等离子体加速器的新方法。我们证明，长的高能量驱动激光脉冲的时间相位可以通过与短的低能量种子脉冲驱动的低振幅等离子体波共同传播来周期性地调制。通过色散光学器件压缩调制驱动器会产生一系列适合谐振驱动等离子体加速器的短脉冲。驱动器的调制是通过良好控制的线性过程进行的，细胞内粒子 (PIC) 模拟与分析模型之间的良好一致性证实了这一点。 PIC 模拟表明，1.7 J、1 ps 驱动器和 140 mJ、40 fs 种子脉冲可以在轴向密度为 2.5×10^{17} cm^{-3} 的等离子体通道中将电子加速到 0.65 GeV 的能量。这项工作为薄盘激光器驱动的高重复率、GeV 级等离子体加速器开辟了一条道路，它可以以千赫兹重复率和高电光转换效率提供焦耳级、皮秒持续时间的激光脉冲。
We describe a new approach for driving GeV-scale plasma accelerators with long laser pulses. We show that the temporal phase of a long, high-energy driving laser pulse can be modulated periodically by copropagating it with a low-amplitude plasma wave driven by a short, low-energy seed pulse. Compression of the modulated driver by a dispersive optic generates a train of short pulses suitable for resonantly driving a plasma accelerator. Modulation of the driver occurs via well-controlled linear processes, as confirmed by good agreement between particle-in-cell (PIC) simulations and an analytic model. PIC simulations demonstrate that a 1.7 J, 1 ps driver, and a 140 mJ, 40 fs seed pulse can accelerate electrons to energies of 0.65 GeV in a plasma channel with an axial density of 2.5×10^{17} cm^{-3}. This work opens a route to high repetition-rate, GeV-scale plasma accelerators driven by thin-disk lasers, which can provide joule-scale, picosecond-duration laser pulses at multikilohertz repetition rates and high wall-plug efficiencies.