Enhanced parametric pulse amplification in a comparable-mass plasma affected by charge state

Enhanced stimulated Brillouin scattering and stimulated Raman scattering are shown in comparable-mass plasma by considering charge state through a simplified theoretical model and particle-in-cell simulations. We present a more general dispersion relation of plasma wave with arbitrary mass ratio (beta = m(e)/m(i)) and charge state (Z = Z(i), Z(e) = 1) compared to the previous electron-positron plasma study. Further, the ion-bulk mode is responsible for Brillouin amplification from kinetic analysis. Higher intensities of seed laser pulse amplification through stimulated Brillouin scattering are observed in beta Z = 1 type plasmas and beta = 1 type plasmas as Z increases; the former is caused by kinetic effects, while the latter is due to the higher growth rates of instability. Our results will have potential application in pulse amplification in the comparable-mass plasmas with charge state Z > 1, such as plasma of C-60(-)/C-60(+), C-60(2+), C-60(3+).