| Autor: |
Glize, Kevin, Zhao, Xu, Zhang, Yihang, Lian, Changwang, Tan, Shang, Wu, Fuyuan, Xiao, Chengzhuo, Yan, Rui, Zhang, Zhe, Yuan, Xiaohui, Zhang, Jie |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Phys. Plasmas 30, 122706 (2023) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1063/5.0180607 |
| Popis: |
Due to its particular geometry, stimulated Raman side-scattering (SRSS) drives scattered light emission at non-conventional directions, leading to scarce and complex experimental observations. Direct-irradiation campaigns at the SG-II UP facility have measured the scattered light driven by SRSS over a wide range of angles. It indicated an emission at large polar angles over a broad azimuthal range, sensitive to the plasma profile and laser polarization, resulting in a loss of about 5\% of the total laser energy. Direct comparison with back-scattering measurement has evidenced SRSS as the dominant Raman scattering process. The predominance of SRSS was confirmed by 2D particle-in-cell simulations, and its angular spread has been corroborated by ray-tracing simulations. The main implication is that a complete characterization of the SRS instability and an accurate measurement of the energy losses require the collection of the scattered light in a broad range of directions. Otherwise, spatially limited measurement could lead to an underestimation of the energetic importance of stimulated Raman scattering. |
| Databáze: |
arXiv |
| Externí odkaz: |
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