We use a one-shot measurement technique to study effects of laser prepulses on the electron laser wakefield acceleration driven by relativistically intense laser pulses (lambda=790 nm, 11 TW, 37 fs) in dense helium gas jets. A quasimonoenergetic electron bunch with an energy peak similar to 11.5 MeV [Delta E/E similar to 10% (FWHM)] and with a narrow-cone angle (0.04 pi mm mrad) of ejection is detected at a plasma density of 8x10(19) cm(-3). A strong correlation between the generation of monoenergetic electrons and optical guiding of the pulse in a thin channel produced by picosecond laser prepulses is observed. This generation mechanism is well corroborated by two-dimensional particle-in-cell simulations.
|Autori:||Hosokai T; Kinoshita K; Ohkubo T; Maekawa A; Uesaka M; Zhidkov A; Yamazaki A; Kotaki H; Kando M; Nakajima K; Bulanov SV; Tomassini P; Giulietti A; Giulietti D|
|Titolo:||Observation of strong correlation between quasimonoenergetic electron beam generation by laser wakefield and laser guiding inside a preplasma cavity|
|Anno del prodotto:||2006|
|Digital Object Identifier (DOI):||10.1103/PhysRevE.73.036407|
|Appare nelle tipologie:||1.1 Articolo in rivista|