Abstract
The rescattering of backward stimulated Raman scattering (BSRS) by stimulated Brillouin scattering (SBS) is found in the high electron density region by relativistic Vlasov-Maxwell simulation and particle-in-cell (PIC) simulation, where the BSRS is in the regime of absolute instability and dominates in all the scatterings. Both one dimension (1D) Vlasov simulation and two dimension (2D) PIC simulation have been given to verify that there exists SBS of BSRS in the regime of absolute instability for BSRS. The SBS of BSRS will be even stronger than forward stimulated Raman scattering (FSRS) and SBS in regime of absolute instability for BSRS. Thus, besides Langmuir decay instability and laser energy absorption, the SBS of BSRS is also an important saturation mechanism of BSRS in high electron density region.
Highlights
The rescattering of backward stimulated Raman scattering (BSRS) by stimulated Brillouin scattering (SBS) is found in the high electron density region by relativistic Vlasov-Maxwell simulation and particle-in-cell (PIC) simulation, where the BSRS is in the regime of absolute instability and dominates in all the scatterings
We report the first demonstration that SBS of BSRS will exist especially in the high electron density region, such as ne ~ 0.2nc, where the BSRS is in the regime of absolute instability and will dominate in all the scatterings
In regime of absolute instability for BSRS, the SBS of BSRS will be even stronger than forward stimulated Raman scattering (FSRS) and SBS excited by the incident laser
Summary
The rescattering of backward stimulated Raman scattering (BSRS) by stimulated Brillouin scattering (SBS) is found in the high electron density region by relativistic Vlasov-Maxwell simulation and particle-in-cell (PIC) simulation, where the BSRS is in the regime of absolute instability and dominates in all the scatterings. Besides Langmuir decay instability and laser energy absorption, the SBS of BSRS is an important saturation mechanism of BSRS in high electron density region. In regime of absolute instability for BSRS, the SBS of BSRS will be even stronger than FSRS and SBS excited by the incident laser These results illustrate that besides LDI and laser energy absorption, the SBS of BSRS is an important saturation mechanism of BSRS in high electron density region
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