Laser fusion and extreme field physics

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Transition of backward stimulated Raman scattering from absolute to convective instability via density modulation

Physics of Plasmas AIP Publishing 24:10 (2017) 103122

Authors:

YX Wang, QS Feng, HC Zhang, Q Wang, CY Zheng, ZJ Liu, XT He
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Harmonic effects on ion-bulk waves and simulation of stimulated ion-bulk-wave scattering in CH plasmas

Plasma Physics and Controlled Fusion IOP Publishing 59:8 (2017) 085007

Authors:

QS Feng, CY Zheng, ZJ Liu, LH Cao, CZ Xiao, Q Wang, HC Zhang, XT He
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Anti-Stokes scattering and Stokes scattering of stimulated Brillouin scattering cascade in high-intensity laser–plasma interaction

Plasma Physics and Controlled Fusion IOP Publishing 59:7 (2017) 075007

Authors:

QS Feng, ZJ Liu, CY Zheng, CZ Xiao, Q Wang, HC Zhang, LH Cao, XT He
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Robustness of raman plasma amplifiers and their potential for attosecond pulse generation

High Energy Density Physics Elsevier 23 (2017) 212-216

Authors:

James D Sadler, Marcin Sliwa, Thomas Miller, Muhammad F Kasim, Naren Ratan, Luke Ceurvorst, Alex Savin, Ramy Aboushelbaya, Peter Norreys, Dan Haberberger, Andrew S Davies, Sara Bucht, Dustin H Froula, Jorge Vieira, Ricardo A Fonseca, Luís O Silva, Robert Bingham, Kevin Glize, Raoul MGM Trines

Abstract:

Raman back-scatter from an under-dense plasma can be used to compress laser pulses, as shown by several previous experiments in the optical regime. A short seed pulse counter-propagates with a longer pump pulse and energy is transferred to the shorter pulse via stimulated Raman scattering. The robustness of the scheme to non-ideal plasma density conditions is demonstrated through particle-in-cell simulations. The scale invariance of the scheme ensures that compression of XUV pulses from a free electron laser is also possible, as demonstrated by further simulations. The output is as short as 300 as, with energy typical of fourth generation sources.
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Stimulated Brillouin scattering behaviors in different species ignition hohlraum plasmas in high-temperature and high-density region

ArXiv 1704.02317 (2017)

Authors:

QS Feng, CY Zheng, ZJ Liu, Q Wang, CZ Xiao, LH Cao, XT He

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.
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