Abstract
Energetic electrons whose maximum energy exceeded 25 MeV were generated using a 2 TW 50 fs laser pulse and a plasma with an electron density of ne \\gtrsim2 ×1020 cm-3. Although we observed first-Stokes satellite peaks in the forward-scattering light spectra, the electron energy was higher than that predicted by self-modulated laser wakefield acceleration (SMLWFA). The density dependence of the effective temperature of the electron beam disagrees with that predicted by direct laser acceleration (DLA). Experimental results suggest that the electrons were accelerated by a cascade of SMLWFA and DLA.
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