Effects of Landau damping and collision on stimulated Raman scattering with various phase-space distributions  

作　　者：Shanxiu Xie Yong Chen Junchen Ye Yugu Chen Na Peng Chengzhuo Xiao 谢善秀;陈勇;叶俊辰;陈雨谷;彭娜;肖成卓(Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education,School of Physics and Electronics,Hunan University,Changsha 410082,China;Institute of Applied Physics and Computational Mathematics,Beijing 100094,China;Collaborative Innovation Center of IFSA(CICIFSA),Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education,School of Physics and Electronics,Hunan University,Changsha 410082,China [2]Institute of Applied Physics and Computational Mathematics,Beijing 100094,China [3]Collaborative Innovation Center of IFSA(CICIFSA),Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Chinese Physics B》2022年第5期464-472,共9页中国物理B（英文版）

基　　金：supported by the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDA25050700);the National Natural Science Foundation of China(Grant Nos.11805062,11875091 and 11975059);the Science Challenge Project(Grant No.TZ2016005);the Natural Science Foundation of Hunan Province,China(Grant No.2020JJ5029)。

摘　　要：Stimulated Raman scattering(SRS)is one of the main instabilities affecting success of fusion ignition.Here,we study the relationship between Raman growth and Landau damping with various distribution functions combining the analytic formulas and Vlasov simulations.The Landau damping obtained by Vlasov-Poisson simulation and Raman growth rate obtained by Vlasov-Maxwell simulation are anti-correlated,which is consistent with our theoretical analysis quantitatively.Maxwellian distribution,flattened distribution,and bi-Maxwellian distribution are studied in detail,which represent three typical stages of SRS.We also demonstrate the effects of plateau width,hot-electron fraction,hot-to-cold electron temperature ratio,and collisional damping on the Landau damping and growth rate.They gives us a deep understanding of SRS and possible ways to mitigate SRS through manipulating distribution functions to a high Landau damping regime.

关 键 词：stimulated Raman scattering Landau damping distribution functions 

分 类 号：TL632[核科学技术—核技术及应用]