The 6th International Conference on Matter and Radiation at Extremes (ICMRE2023)

221 / 2023-04-15 23:33:29

Suppressing stimulated Raman side-scattering by vector beams

Stimulated Raman Side Scattering,laser plamsa instability

Inertial Confinement Fusion Physics > Inertial Confinement Fusion Physics-poster

The Laser Plasma Instability (LPI) is a major factor that affects Inertial Confinement Fusion (ICF) ignition, and it is closely related to plasma parameters. The stimulated Raman scattering is one of the main hazards associated with LPI, which can lead to a reduction in laser energy coupling efficiency and generate hot electrons that can preheat the target pellet. While backward Raman scattering has received significant attention in the past few decades, recent experimental evidence from several groups in China and abroad has confirmed the importance of stimulated Raman side-scattering (SRSS)[1-3]. As a result, SRSS is gaining renewed attention. This study proposes a novel method to SRSS by using a vector light field. By comparing the results with those obtained using line polarized light, it was found that the SSRS can be completely suppressed by using the proposed vector light[4]. This work provides a new regulatory direction for suppressing LPI based on polarization, which is a novel way to understand LPI.

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[1] Glize, K. et al. Measurement of Stimulated Raman Side-Scattering Energetic Importance in Directly Driven Experiment. Preprint at https://doi.org/10.48550/arXiv.2209.08251 (2023).

[2] Depierreux, S. et al. Experimental investigation of the collective raman scattering of multiple laser beams in inhomogeneous plasmas. Phys. Rev. Lett. 117, 235002 (2016).

[3] Dewald, E. L. et al. Generation and beaming of early hot electrons onto the capsule in laser-driven ignition hohlraums. Phys. Rev. Lett. 116, 075003 (2016).

[4] Xiaobao Jia. Et al. Suppressing stimulated Raman side-scattering by vector beams (prepared).