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arXiv 1802.08158physics.acc-ph
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准线性区5-GeV Laser等离子体加速组件的设计

Design of a 5 GeV Laser Plasma Accelerating Module in the Quasi-linear Regime

Xiangkun Li, Alban Mosnier, Phu Anh Phi Nghiem

摘要:

多GeV级激光等离子体加速模块是激光等离子体加速器的关键部件,因为它们可以用作上游等离子体或常规注入器的助推器,或者作为多级高能等离子体直线加速器的模块加速段。这样的等离子体模块,在准线性制度,已被设计为5 GeV的激光等离子体加速器阶段(LPAS)的EuPRAXIA项目。将激光脉冲($\sim$ 150 TW,$\sim$ 15 J)准匹配到等离子体通道($n_{\rm p} = 1.5\times 10^{17}$ cm $^{-3}$,$L\sim$ 30 cm)中,并且将双高斯电子束从外部注入尾流场中。通过使束尺寸与横向聚焦场匹配,在加速过程中保持束流发射度。通过优化束流加载效果,最终获得了$<$ 1%的能量扩展。已经提出了几种方法来减少切片能量扩散,并被发现是有效的。在洛伦兹增强坐标系中用3D PIC代码Warp进行模拟。

英文摘要:

Multi-GeV-class laser plasma accelerating modules are key components of laser plasma accelerators, because they can be used as a booster of an upstream plasma or conventional injector or as modular acceleration sections of a multi-staged high energy plasma linac. Such a plasma module, operating in the quasi-linear regime, has been designed for the 5 GeV laser plasma accelerator stage (LPAS) of the EuPRAXIA project. The laser pulse ($\sim$150 TW, $\sim$ 15 J) is quasi-matched into a plasma channel ($n_{\rm p} = 1.5\times 10^{17}$ cm$^{-3}$, $L\sim$ 30 cm) and the bi-Gaussian electron beam is externally injected into the wakefield. The beam emittance is preserved through the acceleration by matching the beam size to the transverse focusing fields. And a final energy spread of $<$1\% has been achieved by optimizing the beam loading effect. Several methods have been proposed to reduce the slice energy spread and are found to be effective. The simulations were conducted with the 3D PIC code Warp in the Lorentz boosted frame.

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