中国物理B ›› 2024, Vol. 33 ›› Issue (1): 15206-15206.doi: 10.1088/1674-1056/ad0716

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Suppression of stimulated Brillouin and Raman scatterings using an alternating frequency laser and transverse magnetic fields

Rui-Jin Cheng(程瑞锦)1, Xiao-Xun Li(李晓旬)1, Qing Wang(王清)1, De-Ji Liu(刘德基)1, Zhuo-Ming Huang(黄卓明)1, Shuai-Yu Lv(吕帅宇)1, Yuan-Zhi Zhou(周远志)2, Shu-Tong Zhang(张舒童)2, Xue-Ming Li(李雪铭)1, Zu-Jie Chen(陈祖杰)2, Qiang Wang(王强)1, Zhan-Jun Liu(刘占军)1,3, Li-Hua Cao(曹莉华)1,3, and Chun-Yang Zheng(郑春阳)1,3,†   

  1. 1 Institute of Applied Physics and Computational Mathematics, Beijing 100094, China;
    2 HEDPS, Center for Applied Physics and Technology, and State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China;
    3 HEDPS, Center for Applied Physics and Technology, and College of Engineering, Peking University, Beijing 100871, China
  • 收稿日期:2023-08-20 修回日期:2023-10-17 接受日期:2023-10-26 出版日期:2023-12-13 发布日期:2023-12-29
  • 通讯作者: Chun-Yang Zheng E-mail:zhengcy@iapcm.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11975059 and 12005021).

Suppression of stimulated Brillouin and Raman scatterings using an alternating frequency laser and transverse magnetic fields

Rui-Jin Cheng(程瑞锦)1, Xiao-Xun Li(李晓旬)1, Qing Wang(王清)1, De-Ji Liu(刘德基)1, Zhuo-Ming Huang(黄卓明)1, Shuai-Yu Lv(吕帅宇)1, Yuan-Zhi Zhou(周远志)2, Shu-Tong Zhang(张舒童)2, Xue-Ming Li(李雪铭)1, Zu-Jie Chen(陈祖杰)2, Qiang Wang(王强)1, Zhan-Jun Liu(刘占军)1,3, Li-Hua Cao(曹莉华)1,3, and Chun-Yang Zheng(郑春阳)1,3,†   

  1. 1 Institute of Applied Physics and Computational Mathematics, Beijing 100094, China;
    2 HEDPS, Center for Applied Physics and Technology, and State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China;
    3 HEDPS, Center for Applied Physics and Technology, and College of Engineering, Peking University, Beijing 100871, China
  • Received:2023-08-20 Revised:2023-10-17 Accepted:2023-10-26 Online:2023-12-13 Published:2023-12-29
  • Contact: Chun-Yang Zheng E-mail:zhengcy@iapcm.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11975059 and 12005021).

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摘要： A novel scheme to suppress both stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) by combining an alternating frequency (AF) laser and a transverse magnetic field is proposed. The AF laser allows the laser frequency to change discretely and alternately over time. The suppression of SBS is significant as long as the AF difference is greater than the linear growth rate of SBS or the alternating time of the laser frequency is shorter than the linear growth time of SBS. However, the AF laser proves ineffective in suppressing SRS, which usually has a much higher linear growth rate than SBS. To remedy that, a transverse magnetic field is included to suppress the SRS instability. The electrons trapped in the electron plasma waves (EPWs) of SRS can be accelerated by the surfatron mechanism in a transverse magnetic field and eventually detrapped. While continuously extracting energy from EPWs, the EPWs are dissipated and the kinetic inflation of SRS is suppressed. The one-dimensional particle-in-cell simulation results show that both SBS and SRS can be effectively suppressed by combining the AF laser with a transverse magnetic field with tens of Tesla. The total reflectivity can be dramatically reduced by more than one order of magnitude. These results provide a potential reference for controlling SBS and SRS under the related parameters of inertial confinement fusion.

关键词: stimulated Brillouin scattering, stimulated Raman scattering, alternating frequency laser, transverse magnetic field

Abstract: A novel scheme to suppress both stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) by combining an alternating frequency (AF) laser and a transverse magnetic field is proposed. The AF laser allows the laser frequency to change discretely and alternately over time. The suppression of SBS is significant as long as the AF difference is greater than the linear growth rate of SBS or the alternating time of the laser frequency is shorter than the linear growth time of SBS. However, the AF laser proves ineffective in suppressing SRS, which usually has a much higher linear growth rate than SBS. To remedy that, a transverse magnetic field is included to suppress the SRS instability. The electrons trapped in the electron plasma waves (EPWs) of SRS can be accelerated by the surfatron mechanism in a transverse magnetic field and eventually detrapped. While continuously extracting energy from EPWs, the EPWs are dissipated and the kinetic inflation of SRS is suppressed. The one-dimensional particle-in-cell simulation results show that both SBS and SRS can be effectively suppressed by combining the AF laser with a transverse magnetic field with tens of Tesla. The total reflectivity can be dramatically reduced by more than one order of magnitude. These results provide a potential reference for controlling SBS and SRS under the related parameters of inertial confinement fusion.

Key words: stimulated Brillouin scattering, stimulated Raman scattering, alternating frequency laser, transverse magnetic field

中图分类号:  (Laser-plasma interactions)

  • 52.38.-r
52.38.Bv (Rayleigh scattering; stimulated Brillouin and Raman scattering) 52.57.-z (Laser inertial confinement) 52.65.-y (Plasma simulation)