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Electron energy spectra plotted with a linear scale for , 2.0, and 2.3 kJ.
(a) Calculated electron spectra using a simple wakefield acceleration model for three plasma densities, , , and , and the spectrum of injected electron beam which has Maxwellian distribution of 300 keV. The propagation length is fixed to be 3 mm. (b) Calculated electron spectra for three propagation lengths, , , and 3 mm, respectively. The plasma density is fixed to be .
Energy distribution function of electron obtained by 2D-PIC simulation for . The plasma length is 1.2 mm.
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