Calculaton of proton cut-off energy accelerated in interaction of fs-laser pulse and solid targets

Cut-off energy of proton accelerated in experiment on SILEX-I is estimated, according to the front mechanism and rear side mechanism of interaction between ultrashort ultra-intense laser and solid target. The estimation according to the rear side mechanism agree well with experimental data. Meanwhile, the maximum proton energy accelerated in interaction of short laser pulse with solid targets on SILEX-I is also calculated: 11 MeV for the rear side mechanism and 2.0 MeV for the front side mechanism. Besides, the influence of prepulse to accelerating field is estimated by Multi2005 code and it can be neglected when signal-to-noise ratio is better than 108∶1.