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Laser-driven acceleration of electrons in a partially ionized plasma channel

Rowlands-Rees, T.P. and Kamperidis, C. and Kneip, S. and Gonsalves, A.J. and Mangles, S.P.D. and Gallacher, J.G. and Brunetti, E. and Ibbotson, T. and Jaroszynski, D.A. (2008) Laser-driven acceleration of electrons in a partially ionized plasma channel. Physical Review Letters, 100 (10). ISSN 0031-9007

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Abstract

The generation of quasimonoenergetic electron beams, with energies up to 200 MeV, by a laser-plasma accelerator driven in a hydrogen-filled capillary discharge waveguide is investigated. Injection and acceleration of electrons is found to depend sensitively on the delay between the onset of the discharge current and the arrival of the laser pulse. A comparison of spectroscopic and interferometric measurements suggests that injection is assisted by laser ionization of atoms or ions within the channel.