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Ion focusing effect of electron cloud produced by laser-plasma interaction

Published online by Cambridge University Press:  06 March 2006

Department of Material Science and Engineering, Utsunomiya University, Tochigi, Japan
Department of Electrical and Electronic Engineering, Utsunomiya University, Tochigi, Japan
Department of Electrical and Electronic Engineering, Utsunomiya University, Tochigi, Japan
Institute of Modern Physics, Fudan University, Shanghai, China
Department of Electrical and Electronic Engineering, Utsunomiya University, Tochigi, Japan
Institute for Laser Physics, St Petersburg, Russia
Institute of Physics, Czech Technical University Academy of Sciences of the Czech Republic, Praha, Czech Republic


We propose a focusing mechanism of high-energy ions by an electron cloud produced by a laser interaction with slab plasma. In our 2.5-dimensional (2.5D) particle-in-cell simulations, the laser intensity is 2 × 1020 W/cm2, the laser wavelength λ is 1.053 μm, and the laser spot size is 2.5λ. When the high intensity laser irradiates slab plasma, electrons are accelerated, oscillate around the plasma and produce the electron cloud locally at the sides of the plasma. Because the electrons are localized transversely, a static electric potential is formed to focus ions and at the same time the ions are accelerated longitudinally. Though the longitudinal ion acceleration has been studied well, the ion focusing effect is reported for the first time in this paper. In our calculations, the maximum energy and intensity of the protons are 8.61 MeV and 1.89 × 1017 W/cm2, and the diameter of the proton bunch accelerated are focused to 71.2% of its initial size.

Research Article
© 2006 Cambridge University Press

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