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Abstract
Electron bunches produced in self-modulated laser wakefield experiments usually have a broad energy distribution, with most electrons at low energy (1--3 MeV) and only a small fraction at high energy. We propose and investigate further acceleration of such bunches in a channel-guided resonant laser wakefield accelerator. Two-dimensional simulations with and without the effects of self-consistent beam loading are performed and compared. These results indicate that it is possible to trap about $40%$ of the injected bunch charge and accelerate this fraction to an average energy of about 50 MeV in a plasma channel of a few mm.
Highlights
In recent years, experiments on the self-modulated laser wakefield (SMLW) accelerator [1] have been conducted at various laboratories [2,3,4,5,6,7,8]
The main reason for the blowout to occur is that the spacing of the electron bunch does not match the wave of the wakefield
We have proposed and investigated a novel two-stage laser wakefield accelerator (LWFA) accelerator consisting of a SMLW that generates a low-energy electron bunch, which is injected into a channel-guided resonant LWFA for acceleration to high energy
Summary
Experiments on the self-modulated laser wakefield (SMLW) accelerator [1] have been conducted at various laboratories [2,3,4,5,6,7,8]. The SMLW electron bunch, with the bulk of the electrons at low energy, is injected into the second stage, which is a channel-guided resonant LWFA This second acceleration stage, which we call the postacceleration, is studied in detail with fluid and particle simulations, with and without the effects of self-consistent beam loading. This model distribution does not directly use data from SMLW experiments or simulations, but it is constructed in such a way that it contains a number of features found in most experiments and simulations Using this model for the injected bunch, the postacceleration process is studied in detail via simulations based on a 2D code that combines a particle description for the electron bunch with a fluid model for the wakefields, including all beam loading effects.
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