# Stimulated Brillouin scattering behaviors in different species ignition hohlraum plasmas in high-temperature and high-density region

## TL;DR

This study investigates stimulated Brillouin scattering (SBS) behaviors in various high-temperature, high-density ignition hohlraum plasmas with different ion species, revealing how ion composition influences SBS modes and stability.

## Contribution

It provides a detailed analysis of IAW mode excitation and SBS properties across different plasma species, highlighting how ion composition affects SBS stability and potential control methods.

## Key findings

- HeH and CH plasmas exhibit strong convective SBS instability.
- AuB plasmas show absolute SBS instability due to weak Landau damping.
- SBS in CH can transition from convective to absolute instability with particle trapping.

## Abstract

The presence of multiple ion species can add additional branches to the IAW dispersion relation and change the Landau damping significantly. Different IAW modes excited by stimulated Brillouin scattering (SBS) and different SBS behaviors in several typical ignition hohlraum plasmas in the high-temperature and high-density region have been researched by Vlasov-Maxwell simulation. The slow mode in HeH or CH plasmas is the least damped mode and will be excited in SBS, while the fast mode in AuB plasmas is the least damped mode and will be excited in SBS. Due to strong Landau damping, the SBS in H or HeH plasmas is strong convective instability, while the SBS in AuB plasmas is absolute instability due to the weak Landau damping. However, although the SBS in CH plasmas is weak convective instability in the linear theory, the SBS will transform into absolute instability due to decreasing linear Landau damping by particles trapping. These results give a detail research of the IAW modes excitation and the properties of SBS in different species plasmas, thus providing the possibility of controlling SBS by increasing the linear Landau damping of the IAW by changing ion species.