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A novel regime is proposed where, employing linearly polarized laser pulsesat intensities $10^{21}\textrm{Wcm}^{-2}$ as two order of magnitude lower thanearlier predicted [T. Esirkepov et al., Phys. Rev. Lett. 92, 175003 (2004)],ions are dominantly accelerated from ultrathin foils by the radiation pressure,and have monoenergetic spectra. In the regime, ions accelerated from thehole-boring process quickly catch up with the ions accelerated by target normalsheath acceleration (TNSA), and they then join in a single bunch, undergoing ahybrid Light-Sail/TNSA acceleration. Under an appropriate coupling conditionbetween foil thickness, laser intensity and pulse duration, laser radiationpressure can be dominant in this hybrid acceleration. Two-dimensional PICsimulations show that $1.26\textrm{GeV}$ quasimonoenergetic $\textrm{C}^{6+}$beams are obtained by linearly polarized laser pulses at intensities of$10^{21}\textrm{Wcm}^{-2}$.

Dominance of Radiation Pressure in Ion Acceleration with Linearly Polarized Pulses at Intensities of $10^{21}\textrm{W}\textrm{cm}^{-2}$