7th Asia-Pacific Conference on Plasma Physics, 12-17 Nov, 2023 at Port Messe Nagoya

Rescattering of stimulated Raman sidescattering in nonuniform plasma
Shang Tan1,Qing Wang2 , Yong Chen3, Weibo Yao1,Chengzhuo Xiao1
1
School of Physics and Electronics, Hunan University,
2
Institute of Applied Physics and Computational Mathematics
3
Anhui University of Science and Technology
e-mail(speaker): shangtan@hnu.edu.cn

Laser plasma instabilities (LPI) are importantelectrons. We find that heating by the 2nd-orderunsolved problem in inertial confifinement fusion

SRSS has nearly the same consequence as the(ICF), which include stimulated Raman scattering

1st-order SRSS does, but no cascade acceleration(SRS), stimulated Brillouin scattering (SBS),twophenomenon is observed. Rescatterings of SRSS

plasma decay (TPD) and so on[1–3]. The SRS

under different intensities, density scale lengths,

process has attracted much attention because ofand electron temperatures are performed andthe loss of laser energy and the generation of hot

discussed in details. Higher-order SRSS observed

electrons to preheat the fuel[4–6]. Upon enteringin high intensity regime and the predominance of

the inhomogeneous plasma, the incident laserside scattering in almost all cases have shown that

undergoes scattering at a range of angles, andSRSS and associated rescatterings are robust andnumerous occurrences of large-angle scattering

important processes in ICF.

have been observed in early experiments[7,8]. As aresult of the different directions of the scattered
light, SRS in plasma has two main scattering forms:
If the scattered light vector is the opposite of theincident light vector, it is stimulated Ramanbackscattering (SRBS)[9], if the scattered lightvector is not collinear with the incident light vector,
it is stimulated Raman sidescattering (SRSS)[7,10].
In this work, we construct a theoretical model fortherescatterings

occurrence

regionhigher-orderofSRSS.We

andSRSS.

derivethresholdfor

the
the

Two-dimensional(2D)

particle-in-cell (PIC) simulations is shown that
rescatteringofSRSS

occursunder

typicalparameter space of direct-drive-based scenarios
and is consistent with our theoretical model. We
explore the effect of the 2nd-order SRSS on the hotReferences[1] M. N. Rosenbluth, Phys. Rev. Lett. 29, 565(1972).
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