title: Plasma devices to guide and collimate a high density of MeV electrons.
abstract: The development of ultra-intense lasers has facilitated new studies in laboratory astrophysics and high-density nuclear science, including laser fusion. Such research relies on the efficient generation of enormous numbers of high-energy charged particles. For example, laser-matter interactions at petawatt (10(15) W) power levels can create pulses of MeV electrons with current densities as large as 10(12) A cm(-2). However, the divergence of these particle beams usually reduces the current density to a few times 10(6) A cm(-2) at distances of the order of centimetres from the source. The invention of devices that can direct such intense, pulsed energetic beams will revolutionize their applications. Here we report high-conductivity devices consisting of transient plasmas that increase the energy density of MeV electrons generated in laser-matter interactions by more than one order of magnitude. A plasma fibre created on a hollow-cone target guides and collimates electrons in a manner akin to the control of light by an optical fibre and collimator. Such plasma devices hold promise for applications using high energy-density particles and should trigger growth in charged particle optics.
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita Osaka 565-0871, Japan. ryo@ile.osaka-u.ac.jp
authors.forename: R
authors.initials: R
authors.lastname: Kodama
authors.forename: Y
authors.initials: Y
authors.lastname: Sentoku
authors.forename: Z L
authors.initials: ZL
authors.lastname: Chen
authors.forename: G R
authors.initials: GR
authors.lastname: Kumar
authors.forename: S P
authors.initials: SP
authors.lastname: Hatchett
authors.forename: Y
authors.initials: Y
authors.lastname: Toyama
authors.forename: T E
authors.initials: TE
authors.lastname: Cowan
authors.forename: R R
authors.initials: RR
authors.lastname: Freeman
authors.forename: J
authors.initials: J
authors.lastname: Fuchs
authors.forename: Y
authors.initials: Y
authors.lastname: Izawa
authors.forename: M H
authors.initials: MH
authors.lastname: Key
authors.forename: Y
authors.initials: Y
authors.lastname: Kitagawa
authors.forename: K
authors.initials: K
authors.lastname: Kondo
authors.forename: T
authors.initials: T
authors.lastname: Matsuoka
authors.forename: H
authors.initials: H
authors.lastname: Nakamura
authors.forename: M
authors.initials: M
authors.lastname: Nakatsutsumi
authors.forename: P A
authors.initials: PA
authors.lastname: Norreys
authors.forename: T
authors.initials: T
authors.lastname: Norimatsu
authors.forename: R A
authors.initials: RA
authors.lastname: Snavely
authors.forename: R B
authors.initials: RB
authors.lastname: Stephens
authors.forename: M
authors.initials: M
authors.lastname: Tampo
authors.forename: K A
authors.initials: KA
authors.lastname: Tanaka
authors.forename: T
authors.initials: T
authors.lastname: Yabuuchi