Abstract
The trapping and acceleration of an externally injected electron bunch into a donut-like wakefield driven by an intense Laguerre-Gaussian (LG) laser pulse in the plasma are studied. The results because of the doughnut shape profile of the LG laser pulse and low divergence propagating can be used in applications such as accelerating a hollow electron bunch. For the high-energy acceleration in the donut wake, while keeping the emittance conserved and making the Relative Energy Spread (RES) a few percent, the suitable initial bunch parameters are investigated. Careful optimization of the test electron bunch parameters allows one to obtain a minimum suitable RES and a stable emittance of the accelerated bunch in the donut wakefield.
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