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Snapshots of longitudinal distributions of electron momenta (dots) and electric fields (lines) of the wakefield at when the two pulses meet (a) and at (b), where the peak amplitudes of the two pulses are and , respectively. The cases with or without the injection pulse are distinguished by red dots or lines and blue dots or lines, respectively.
Characteristic of the injected electron beam at found with the same laser parameters as in Fig. 1. (a) Electron distributions in the longitudinal phase space . (b) Electron distributions in the coordinate spaces . (c) Electron divergence angle with its longitudinal momentum. (d) Electron energy distribution.
Features of the trapped electron beam at as a function of (a) the injection pulse amplitude with fixed , (b) the pump pulse amplitude with fixed , (c) the meeting time of the two pulses with fixed and , (d) and the injection pulse duration with fixed and . The charge, energy spread, emittance, and average energy are normalized by , , , and defined in the text.
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