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Spatially localized self-injection of electrons in a self-modulated laser-wakefield accelerator by using a
T-Y Chien1, C-L Chang, C-H Lee
1Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan.
Abstract:
By using a laser-induced transient density ramp, we demonstrate self-injection of electrons in a self-modulated laser-wakefield accelerator with spatial localization. The number of injected electrons reaches 1.7 x 10(8). The transient density ramp is produced by a prepulse propagating transversely to drill a density depression channel via ionization and expansion. The same mechanism of injection with comparable efficiency is also demonstrated with a transverse plasma waveguide driven by Coulomb explosion.
