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Velchev I , Fourkal E , Ma CM
Laser-induced Coulomb mirror effect: Applications for proton acceleration
Physics of Plasmas. 2007 Mar;14(3)
PMID: ISI:000245320000034   
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Using two-dimensional particle-in-cell simulations, the temporal evolution of the uncompensated charge on an ultra-thin (400 nm) foil target ionized by a relativistically intense laser pulse is studied in detail. The analysis reveals a new dynamic regime of acceleration of light ions/protons that allows particles to experience the maximum acceleration potential created by the laser. As an alternative to the conventional double-layer target, a new target geometry in which the proton energy is enhanced by approximate to 30% is proposed. (c) 2007 American Institute of Physics.
Velchev, I. Fourkal, E. Ma, C. -M. 22