Study of stimulated Raman and Brillouin scattering in a finite interaction region under the convective instability condition

Hao, Liang; Liu, ZhanJu; Zheng, Chunyang; Xiang, Jin; Wu, Feng; Hu, Xiaoyan; Li, Bin

doi:10.1007/s11434-012-5243-7

Cited by 10 publications

(5 citation statements)

References 21 publications

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“…Assuming the plasmas are local uniform, the standard linear one-dimensional SBS three-waves interaction equations in homogenous plasmas are [35][36][37] ( ∂ ∂t…”

Section: B Absolute and Convective Condition For Stimulated Brillouimentioning

confidence: 99%

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Stimulated Brillouin scattering behaviors in multi-ion species plasmas in high-temperature and high-density region

et al. 2019

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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.

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“…Assuming the plasmas are local uniform, the standard linear one-dimensional SBS three-waves interaction equations in homogenous plasmas are [35][36][37] ( ∂ ∂t…”

Section: B Absolute and Convective Condition For Stimulated Brillouimentioning

confidence: 99%

“…Assuming that the ions average mass and average charge number are mi and Zi . Following Hao et al [36,38], one can obtain the usual SBS threshold γ thB = √ ν A ν s and the threshold of absolute SBS instability is…”

Section: B Absolute and Convective Condition For Stimulated Brillouin...mentioning

confidence: 99%

Stimulated Brillouin scattering behaviors in multi-ion species plasmas in high-temperature and high-density region

et al. 2019

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“…The SBS process where the incident light couples to IAW and a backward-scattered electromagnetic wave, can be described by the following system of coupled envelope equations [39][40][41], relevant to an inhomogeneous flowing plasma: The slowly varying complex envelopes A 0 , A 1 and dn e describe the incident light vector potential, the Brillouin reflected light vector potential and the IAW amplitude, respectively. The group velocities of the waves are given by where g LDs is the contribution to the linear Landau damping of IAW, w = q Ek m bs s s is the bounce frequency and n ds is the effective diffusion rate of the trapped particle for species s. Although, comparing with the linear Landau damping of IAW, the collisional damping of IAW is very small for SBS in high temperature plasmas [44][45][46][47][48][49], it is well-known that the Landau damping can be significantly reduced by the modification of the distribution near the wave's phase velocity due to particle trapping [29,30].…”

Section: The Three Coupled-mode Equations For Sbsmentioning

confidence: 99%

The interplay between the kinetic nonlinear frequency shift and the flowing gradient in stimulated Brillouin scattering

Wang

Zheng

Liu

et al. 2017

Plasma Phys. Control. Fusion

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The effect of the kinetic nonlinear frequency shift (KNFS) on backward stimulated Brillouin scattering (SBS) in homogeneous plasmas and inhomogeneous flowing plasmas is investigated by three-wave coupled-mode equations. When the positive contribution to the KNFS from electrons as well as the negative contribution from ions is included, the net KNFS can become positive at a large electron-ion temperature ratio ZT T e i . In homogeneous plasmas, KNFS can greatly reduce the SBS reflectivity at low or large ZT T e i but has a weak effect on SBS at ZT T e iwhere the positive frequency shifts from electrons almost cancels out the negative shifts from ions. In inhomogeneous plasmas, the net negative frequency shift can enhance the backward SBS reflectivity for the negative gradient of the plasma flowing, and can suppress the reflectivity for the positive case. On the contrary, the net positive frequency can suppress the reflectivity for the negative case of the flowing gradient and enhance the reflectivity for the positive case. This indicates that the SBS in inhomogeneous flowing plasmas can be controlled by changing the sign of the nonlinear frequency shift.

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“…From the three-wave equations [29][30][31], the theoretical growth rate of SRS scattered light in homogeneous plasmas is [1,32]…”

Section: Theoretical Analysismentioning

confidence: 99%

Suprathermal electrons from the anti-Stokes Langmuir decay instability cascade

et al. 2022

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Study of stimulated Raman and Brillouin scattering in a finite interaction region under the convective instability condition

Cited by 10 publications

References 21 publications

Stimulated Brillouin scattering behaviors in multi-ion species plasmas in high-temperature and high-density region

Stimulated Brillouin scattering behaviors in multi-ion species plasmas in high-temperature and high-density region

The interplay between the kinetic nonlinear frequency shift and the flowing gradient in stimulated Brillouin scattering

Suprathermal electrons from the anti-Stokes Langmuir decay instability cascade

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