title: Collimated fast electron emission from long wires irradiated by intense femtosecond laser pulses.
abstract: We have experimentally demonstrated that fast electrons emitted from a metallic wire irradiated by a 5 × 10(18) W/cm(2) laser pulse can be collimated along the wire, and that their intensity is significantly enhanced in the axial direction of the wire. As the wire length is increased up to 30 mm from the laser focal spot, the angular divergence of the emitted electrons with energies of hundreds of keV decreases to 65 mrad. Numerical simulations reveal that the electrons are trapped by the transient electric field surrounding the wire and guided along the axial direction.
authors.affiliation: Advanced Research Center for Beam Science, Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan. tokita@laser.kuicr.kyoto-u.ac.jp
authors.forename: Shigeki
authors.initials: S
authors.lastname: Tokita
authors.forename: Kazuto
authors.initials: K
authors.lastname: Otani
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Nishoji
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Inoue
authors.forename: Masaki
authors.initials: M
authors.lastname: Hashida
authors.forename: Shuji
authors.initials: S
authors.lastname: Sakabe