title: Effect of prepulse on fast electron lateral transport at the target surface irradiated by intense femtosecond laser pulses.
abstract: The effects of preplasma on lateral fast electron transport at front target surface, irradiated by ultraintense (>10(18) W/cm2) laser pulses, are investigated by Kα imaging technique. A large annular Kα halo with a diameter of ∼560 μm surrounding a central spot is observed. A specially designed steplike target is used to identify the possible mechanisms. It is believed that the halos are mainly generated by the lateral diffusion of fast electrons due to the electrostatic and magnetic fields in the preplasma. This is illustrated by simulated electron trajectories using a numerical model.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: X X
authors.initials: XX
authors.lastname: Lin
authors.forename: Y T
authors.initials: YT
authors.lastname: Li
authors.forename: B C
authors.initials: BC
authors.lastname: Liu
authors.forename: F
authors.initials: F
authors.lastname: Liu
authors.forename: F
authors.initials: F
authors.lastname: Du
authors.forename: S J
authors.initials: SJ
authors.lastname: Wang
authors.forename: X
authors.initials: X
authors.lastname: Lu
authors.forename: L M
authors.initials: LM
authors.lastname: Chen
authors.forename: L
authors.initials: L
authors.lastname: Zhang
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: F
authors.initials: F
authors.lastname: Liu
authors.forename: X L
authors.initials: XL
authors.lastname: Liu
authors.forename: Z H
authors.initials: ZH
authors.lastname: Wang
authors.forename: J L
authors.initials: JL
authors.lastname: Ma
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Wei
authors.forename: J
authors.initials: J
authors.lastname: Zhang