Energetic protons generated in a thin plastic foil under the irradiation of ultra-intense femtosecond lasers have been experimentally and computationally investigated. More energetic protons were emitted forward in the direction of laser propagation than backward. The maximum energy of protons has been scaled via laser intensity I as 1 0.7, up to 2 MeV at 1018 W/cm2. The laser intensity scaling law for the maximum proton energy was reproduced by 2D-PIC simulation.
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Okihara et al. (2002) studied this question.
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