Abstract
Particle energy chirp is shown to be a useful instrument in the staging laser wakefield acceleration directed to generation of high-quality dense electron beams. The chirp is a necessary tool to compensate non-uniformity of acceleration field in longitudinal direction and achieve essential reduction of energy dispersion. This is demonstrated via particle-in-cell simulations exploiting the splitting technique for plasma and beam electrons. Properly chosen beam chirps allow a decrease in the energy dispersion of order of magnitude in every single stage during acceleration to the GeV energy range.
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