Mitigation of multibeam stimulated Raman scattering with polychromatic light

Abstract A theoretical analysis is presented for the stimulated Raman scattering (SRS) driven by multiple beams with certain frequency differences or bandwidths. The concomitant electrostatic modes are excited lights when pump share a common electron plasma wave to drive SRS. This coupling can be suppressed difference of two three times larger than SRS growth rate single beam, where develop their independently. To mitigate further under multibeam irradiation, polychromatic pumps introduced reduce saturation level, weakly coupled heavily damped in hot plasmas. sidescattering light inhomogeneous plasmas significantly reduced due wavevector mismatch daughter waves. Particle-in-cell simulations confirm our and demonstrate that strength production controlled at low level few percentage bandwidth ( ≳ 3 % ), even non-linear regime.