Convective amplification of stimulated Raman rescattering in a picosecond laser plasma interaction regime

Ji Yu; Lian Chang-Wang; Yan Rui; Ren Chuang; Yang Dong; Wan Zhen-Hua; Zhao Bin; Wang Chen; Fang Zhi-Heng; Zheng Jian

doi:10.1063/5.0026379

Volume 6 Issue 1

Jan. 2021

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Article Navigation > Matter and Radiation at Extremes > 2021 > 6(1): 015901

Ji Yu, Lian Chang-Wang, Yan Rui, Ren Chuang, Yang Dong, Wan Zhen-Hua, Zhao Bin, Wang Chen, Fang Zhi-Heng, Zheng Jian. Convective amplification of stimulated Raman rescattering in a picosecond laser plasma interaction regime[J]. Matter and Radiation at Extremes, 2021, 6(1): 015901. doi: 10.1063/5.0026379

Citation:

Ji Yu, Lian Chang-Wang, Yan Rui, Ren Chuang, Yang Dong, Wan Zhen-Hua, Zhao Bin, Wang Chen, Fang Zhi-Heng, Zheng Jian. Convective amplification of stimulated Raman rescattering in a picosecond laser plasma interaction regime[J]. Matter and Radiation at Extremes, 2021, 6(1): 015901. doi: 10.1063/5.0026379

Citation:

Ji Yu, Lian Chang-Wang, Yan Rui, Ren Chuang, Yang Dong, Wan Zhen-Hua, Zhao Bin, Wang Chen, Fang Zhi-Heng, Zheng Jian. Convective amplification of stimulated Raman rescattering in a picosecond laser plasma interaction regime[J]. Matter and Radiation at Extremes, 2021, 6(1): 015901. doi: 10.1063/5.0026379

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Convective amplification of stimulated Raman rescattering in a picosecond laser plasma interaction regime

doi: 10.1063/5.0026379

Ji Yu^1
,,
Lian Chang-Wang^{2, 3
,},
Yan Rui^{1, 4
,
,
,},
Ren Chuang⁵,
Yang Dong^{2, 3},
Wan Zhen-Hua^1
,,
Zhao Bin^{6, 4},
Wang Chen⁷,
Fang Zhi-Heng⁷,
Zheng Jian^{2, 4, 8
,}

1.
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China
2.
Department of Plasma Physics and Fusion Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
3.
Laser Fusion Research Center, China Academy of Engineering Physics, Sichuan, Mianyang 621900, China
4.
Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
5.
Department of Mechanical Engineering and Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA
6.
Department of Mathematics and Physics, NanJing Institute of Technology, Nanjing, JiangSu 211167, China
7.
Shanghai Institute of Laser Plasma, China Academy of Engineering Physics, Shanghai 201800, China
8.
CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China

More Information

Corresponding author: a)Author to whom correspondence should be addressed: ruiyan@ustc.edu.cn
Received Date: 2020-08-25
Accepted Date: 2020-11-24

Available Online: 2021-01-01

Publish Date: 2021-01-15

Abstract

Abstract

We present particle-in-cell (PIC) simulations of laser plasma instabilities (LPIs) with a laser pulse duration of a few picoseconds. The simulation parameters are appropriate to the planar-target LPI experimental conditions on SG-II. In this regime, the plasmas are characterized by a long electron density scale length and a large electron density range. It is found that when the incident laser intensity is well above its backward stimulated Raman scattering (backward SRS, BSRS) threshold, the backscattered light via the primary BSRS is intense enough to excite secondary SRS (Re-SRS) in the region below one-ninth of the critical density of the incident laser. The daughter light wave via the secondary BSRS (Re-BSRS) is amplified as it propagates toward the higher-density region in the bath of broadband light generated through the primary BSRS process. A higher intensity of the incident laser not only increases the amplitude of the BSRS light but also increases the convective amplification lengths of the Re-BSRS modes by broadening the spectrum of the BSRS light. Convective amplification of Re-BSRS causes pump depletion of the primary BSRS light and may lead to an underestimate of the primary BSRS level in SP-LPI experiments. A significant fraction of the generation of energetic electrons is strongly correlated with the Re-BSRS modes and should be considered as a significant energy loss.

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References(27)

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