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Spectrum linewidth of SBS in collisionless plasma with two species of ions

A problem of scatterd radiation spectrum linewidth of stimulated Brillouin scattering (SBS) in multi-species plasma is studied. It is shown that the threshold and spectral composition of SBS can be varied by changing the concentration of species of the plasma. A possibility of existence of the scattered radiation spectrum with the frequency line width comparable to the ion-acoustic frequency is revealed.