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Backward stimulated Raman scattering (BSRS) with Langmuir decay instability(LDI) and Langmuir collapse has been researched by Vlasov simulation for thefirst time. The decay productions of LDI cascade and their evolution with timeis clearly demonstrated, which occurs simultaneously with Langmuir collapse.The BSRS reflectivity will be decreased largely through LDI cascade andLangmuir collapse. In CH plasmas, when $T_i/T_e=1/3$, the Landau damping of theslow ion-acoustic wave (IAW) is lower than that in H plasmas. Therefore, theBSRS can be further suppressed through LDI cascade by the way of controllingthe species of plasmas and ions ratio. These results give an effectivemechanism to suppress the BSRS and hot electrons generation.

Suppression of Stimulated Raman Scattering and Hot Electrons Generation due to Langmuir Decay Instability Cascade and Langmuir Collapse