Abstract
We propose an all-optical dual-stage laser wakefield acceleration (LWFA), staged with co-propagating two-color laser pulses in a plasma medium, to enhance the electron bunch energy. After the depletion of the leading fundamental laser pulse that initiates self-injection and sets up the first stage particle acceleration, the subsequent second-harmonic laser pulse takes over the acceleration process and accelerates the electron bunch in the second stage over a significantly longer distance than in the first stage. In this all optical dual-stage LWFA, the electrons can gain 3 times higher energy as compared to the energy gain from the single stage LWFA driven by a single-color laser pulse with equivalent energy. Our multi-dimensional particle-in-cell simulations demonstrate that a 10-GeV electron bunch with 20-pC charge can be obtained by the two-color dual-stage LWFA using total input laser power of 0.6 PW.
Highlights
Laser-plasma electron acceleration[1,2,3,4,5] is a promising approach to the generation of electron accelerators because it can provide an accelerating field that can be more than three orders of magnitude larger than those of conventional devices
By fine-tuning the time delay between the two-color laser pulses, quasi-mono-energetic features can be obtained in the accelerated electron beam
To verify the role of time delay between the two pulses on the coupling of the electrons from the first stage into the second stage, we further perform a set of 2D simulations with two-color laser pulses of Pin = 210 TW and α = 0.33 propagating in a 1.5-cm plasma with density 4.35 × 1018 cm−3
Summary
Laser-plasma electron acceleration[1,2,3,4,5] is a promising approach to the generation of electron accelerators because it can provide an accelerating field that can be more than three orders of magnitude larger than those of conventional devices. By fine-tuning the time delay between the two-color laser pulses, quasi-mono-energetic features can be obtained in the accelerated electron beam. The 3D PIC simulations demonstrate that two-color laser pulses can realize the dual-stage acceleration.
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