Abstract: According to the linear theory of stimulated scattering instabilities taking into count kinetic effects, the frequencies and the damping rates of an electron plasma wave (PEW) and of an ion-acoustic wave (IAW) are computed in a maxwellian electron velocity distribution function(n=2) to the non-Maxwellian saturated (n=5) limit. Stimulated Raman scattering and stimulated Brillouin scattering are analyzed, the results show that in high-Z plasmas or in laser hot spots with moderate Z, the damping rate of an electron plasma wave is substantially lower and the frequency of an ion-acoustic wave significantly higher than those in a Maxwellian distribution, and its damping rate is also lower.

Key words: velocity distribution function, damping rate of EPW, frequency of IAW