Generation of quasi-monoenergetic 2 GeV electrons by laser wakefield acceleration

We report self-injected quasi-monoenergetic (5% spread FWHM) acceleration of electrons to 2.0 ± 0.1 GeV by 0.6 PW-laser-driven wakefield acceleration in pure He plasma of density 5×10 17 cm −3 . Electron bunches diverge ∼0.5mrad, and contain ∼60 pC.