The 4th International Conference on Matter and Radiation at Extremes (ICMRE 2019)

317 / 2019-01-28 14:52:41

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

Inertial confinement fusion (ICF),Stimulated Raman scattering (SRS),Hot electrons,Langmuir decay instability (LDI)

Plenary track > Laser and Particle Beam Fusion

Backward stimulated Raman scattering (BSRS) with Langmuir decay instability (LDI) and Langmuir collapse has been researched by Vlasov simulation. The decay productions of LDI cascade and their evolution with time are clearly demonstrated, which occur simultaneously with Langmuir collapse. The BSRS reflectivity will be decreased largely through LDI cascade and Langmuir collapse. Different mechanisms to saturate the BSRS in CH (or H) and C plasmas have been demonstrated for the first time. The dominant saturation mechanism of BSRS in CH (or H) plasmas is LDI cascade and Langmuir collapse. However, in C plasmas, in addition to LDI cascade and Langmuir collapse, the stimulated Brillouin scattering (SBS) will compete with BSRS and saturate BSRS. These results give an effective mechanism to suppress the BSRS and hot electrons generation, which are of important significance in the inertial confinement fusion.